WWA Summary for All Issued by BYZ

Severe Thunderstorm Warning

Severe Thunderstorm Warning
MTC033-069-300115-
/O.NEW.KGGW.SV.W.0022.260530T0013Z-260530T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Glasgow MT
613 PM MDT Fri May 29 2026

The National Weather Service in Glasgow has issued a

* Severe Thunderstorm Warning for...
  East central Petroleum County in northeastern Montana...
  West central Garfield County in northeastern Montana...

* Until 715 PM MDT.

* At 612 PM MDT, a severe thunderstorm was located 11 miles east of
  Winnett, moving north at 10 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage
           to roofs, siding, and trees.

* Locations impacted include...
  Mosby and Cat Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4697 10775 4701 10827 4729 10835 4730 10772
TIME...MOT...LOC 0012Z 174DEG 9KT 4705 10812

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RDJ

Flash Flood Warning

Flash Flood Statement
National Weather Service Billings MT
602 PM MDT Fri May 29 2026

MTC087-300130-
/O.CON.KBYZ.FF.W.0001.000000T0000Z-260530T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Rosebud MT-
602 PM MDT Fri May 29 2026

...FLASH FLOOD WARNING FOR THE NORTHREMINGTONMCGHEE BURN SCAR REMAINS
IN EFFECT UNTIL 730 PM MDT THIS EVENING FOR SOUTHERN ROSEBUD
COUNTY...

At 602 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain over the NorthRemingtonMcGhee Burn Scar. Flash flooding is
ongoing or expected to begin shortly. Excessive rainfall over the
burn scar may result in debris flows. The debris flows can consist of
rock, mud, vegetation and other loose materials.

HAZARD...Flash flooding caused by thunderstorms in and around the
         NorthRemingtonMcGhee Burn Scar.

SOURCE...Radar indicated.

IMPACT...Flooding of areas in and downstream of the
         NorthRemingtonMcGhee Burn Scar.

Some locations that will experience flash flooding include...
  Birney and Birney Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a life threatening situation. Heavy rainfall will cause
extensive and severe flash flooding of creeks...streams...and ditches
in the NorthRemingtonMcGhee Burn Scar. Severe debris flows can also
be anticipated across roads. Roads and driveways may be washed away
in places. If you encounter flood waters...climb to safety.

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles. Do not drive on or attempt to cross flooded
roads, find an alternate route. Roads and driveways may be damaged or
washed out in places.

Remain alert for flooding of creeks, streams, and normally dry
coulees even in areas not receiving rainfall downstream of the burn
area. These can become raging killer currents in a matter of minutes
even from distant rainfall upstream.

Please report observed flooding to local emergency officials and
request they pass the information to the National Weather Service in
Billings.

&&

LAT...LON 4520 10658 4525 10663 4528 10664 4533 10653
      4534 10654 4540 10648 4542 10647 4550 10635
      4549 10633 4546 10634 4539 10626 4535 10628
      4533 10632 4529 10630 4527 10632 4521 10631
      4521 10628 4518 10628 4518 10651 4520 10651

FLASH FLOOD...RADAR INDICATED

$$

McKeown-Robbie

Flash Flood Watch

Flood Watch
National Weather Service Billings MT
1104 AM MDT Fri May 29 2026

MTZ056-067-WYZ198-301715-
/O.CON.KBYZ.FF.A.0001.260530T1200Z-260531T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Red Lodge Foothills-Absaroka/Beartooth Mountains-Northeast
Bighorn Mountains-
1104 AM MDT Fri May 29 2026

...FLASH FLOOD WATCH FOR THE ELK BURN AREA, ROBERTSON DRAW BURN AREA
AND EAST SIDE BURN AREA REMAINS IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY EVENING...

* WHAT...Flash flooding and debris flows caused by excessive rainfall
  are possible over the Elk, Robertson Draw, and East Side Burn Areas
  on Saturday.

* WHERE...Portions of south central Montana, including the following
  areas, Absaroka/Beartooth Mountains and Red Lodge Foothills and
  north central Wyoming, including the following area, Northeast
  Bighorn Mountains.

* WHEN...From Saturday morning through Saturday evening.

* IMPACTS...Periods of heavy rainfall with embedded thunderstorms are
  expected over the Elk, Robertson Draw, and East Side Burn Areas
  Saturday, possibly beginning early in the morning. Residents in and
  downstream of these burn scars should prepare for potential rapid
  runoff, flooding and debris flows. Narrow drainages and low-lying
  areas are especially prone to flood. Be sure to stay up to date
  with information from local authorities.

* ADDITIONAL DETAILS...
  - Periods of heavy rainfall with embedded thunderstorms are
    expected across the region. The Elk Burn Area along the eastern
    slopes of the Bighorns, and the Robertson Draw and East Side Burn
    Areas south of Red Lodge, could experience flash flooding and
    debris flows. Stay alert!
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Lester

Flood Watch
National Weather Service Billings MT
1104 AM MDT Fri May 29 2026

WYZ199-301715-
/O.EXA.KBYZ.FF.A.0001.260530T1200Z-260531T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sheridan Foothills-
1104 AM MDT Fri May 29 2026

...FLASH FLOOD WATCH FOR THE ELK BURN AREA, ROBERTSON DRAW BURN AREA
AND EAST SIDE BURN AREA IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

* WHAT...Flash flooding and debris flows caused by excessive rainfall
  are possible over the Elk, Robertson Draw, and East Side Burn Areas
  on Saturday.

* WHERE...A portion of north central Wyoming, including the following
  area, Sheridan Foothills.

* WHEN...From Saturday morning through Saturday evening.

* IMPACTS...Periods of heavy rainfall with embedded thunderstorms are
  expected over the Elk, Robertson Draw, and East Side Burn Areas
  Saturday, possibly beginning early in the morning. Residents in and
  downstream these burn scars should prepare for potential rapid
  runoff, flooding and debris flows. Narrow drainages and low-lying
  areas are especially prone to flood. Be sure to stay up to date
  with information from local authorities.

* ADDITIONAL DETAILS...
  - Periods of heavy rainfall with embedded thunderstorms are
    expected across the region. The Elk Burn Area along the eastern
    slopes of the Bighorns, and the Robertson Draw and East Side Burn
    Areas south of Red Lodge, could experience flash flooding and
    debris flows. Stay alert!
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Flood Advisory

Flood Advisory
National Weather Service Great Falls MT
501 PM MDT Fri May 29 2026

MTC005-300200-
/O.NEW.KTFX.FA.Y.0011.260529T2301Z-260530T0200Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Blaine MT-
501 PM MDT Fri May 29 2026

...FLOOD ADVISORY IN EFFECT UNTIL 8 PM MDT THIS EVENING...

* WHAT...Flooding caused by excessive rainfall is expected.

* WHERE...A portion of north central Montana, including the
  following county, Blaine.

* WHEN...Until 800 PM MDT.

* IMPACTS...Minor flooding in low-lying and poor drainage areas.
  Rises in small streams and normally dry arroyos.

* ADDITIONAL DETAILS...
  - At 501 PM MDT, Doppler radar indicated heavy rain due to
    thunderstorms. Minor flooding is ongoing or expected to begin
    shortly in the advisory area. Between 1 and 2 inches of rain
    have fallen.
  - Additional rainfall amounts up to 1.5 inches are expected
    over the area. This additional rain will result in minor
    flooding.
  - Some locations that will experience flooding include...
    mainly rural areas of South Central Blaine County
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4792 10873 4792 10882 4792 10889 4788 10889
      4787 10889 4786 10889 4787 10902 4808 10902
      4807 10867 4792 10868


$$

Wilson

Flood Advisory
National Weather Service Great Falls MT
357 PM MDT Fri May 29 2026

MTC013-045-300100-
/O.NEW.KTFX.FA.Y.0010.260529T2157Z-260530T0100Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cascade MT-Judith Basin MT-
357 PM MDT Fri May 29 2026

...FLOOD ADVISORY IN EFFECT UNTIL 7 PM MDT THIS EVENING...

* WHAT...Flooding caused by excessive rainfall is expected.

* WHERE...A portion of central Montana, including the following
  counties, Cascade and Judith Basin.

* WHEN...Until 700 PM MDT.

* IMPACTS...Minor flooding in low-lying and poor drainage areas.
  Rises in small streams and normally dry arroyos.

* ADDITIONAL DETAILS...
  - At 357 PM MDT, Doppler radar indicated heavy rain due to
    thunderstorms. Minor flooding is ongoing or expected to begin
    shortly in the advisory area. Between 1 and 2 inches of rain
    have fallen.
  - Additional rainfall amounts up to 1.5 inches are expected
    over the area. This additional rain will result in minor
    flooding.
  - Some locations that will experience flooding include...
    mainly rural areas of East Central Cascade and West Central
    Judith Basin Counties
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4726 11081 4725 11052 4702 11054 4702 11081


$$

Wilson

Wind Advisory

URGENT - WEATHER MESSAGE
National Weather Service Bismarck ND
1223 PM CDT Fri May 29 2026

NDZ001>004-009-010-012-017>020-031>033-040>044-055>062-300200-
/O.NEW.KBIS.WI.Y.0015.260529T1723Z-260530T0200Z/
Divide-Burke-Renville-Bottineau-Williams-Mountrail-McHenry-McKenzie-
Dunn-Mercer-Oliver-Golden Valley-Billings-Stark-Slope-Hettinger-
Grant-Bowman-Adams-Northwest Ward-
Central and Southern Ward/Minot Area-Western McLean-Eastern McLean-
Western Morton-Eastern Morton-Western Sioux-Eastern Sioux-
Including the cities of Medora, Bowman, Killdeer, Center, Turtle
Lake, Bowbells, Towner, Mandan, Hazen, Marmarth, Lignite, New Salem,
Selfridge, Wilton, Glenburn, Halliday, Portal, Crosby, Powers Lake,
Mott, Mohall, Porcupine, Washburn, Underwood, Solen, Garrison,
Parshall, Velva, Fort Yates, Kenmare, Sherwood, Glen Ullin, New
England, Hebron, Columbus, Bottineau, Carson, Dickinson, New Town,
Stanley, Beach, Max, Watford City, Beulah, Hettinger, New Leipzig,
Drake, Williston, Minot, and Elgin
1223 PM CDT Fri May 29 2026 /1123 AM MDT Fri May 29 2026/

...WIND ADVISORY IN EFFECT UNTIL 9 PM CDT /8 PM MDT/ THIS EVENING...

* WHAT...Southeast winds to 35 mph with gusts up to 50 mph.

* WHERE...Portions of western and central North Dakota.

* WHEN...Until 9 PM CDT /8 PM MDT/ this evening.

* IMPACTS...Items left unsecured outside will be blown around.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.

&&

$$

Anglin

Flood Watch

Flood Watch
National Weather Service Great Falls MT
122 PM MDT Fri May 29 2026

MTZ301>303-307>309-312-316-301230-
/O.NEW.KTFX.FA.A.0001.260530T1800Z-260602T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
East Glacier Park Region-Northern High Plains-Eastern Glacier,
Western Toole, and Central Pondera-Southern Rocky Mountain Front-
Southern High Plains-Eastern Pondera and Eastern Teton-Cascade
County below 5000ft-Gates of the Mountains-
Including the following locations: Cut Bank, North Browning,
Brady, East Glacier Park, Browning, South Browning, Power, East
Glacier Park Village, Shelby, Dutton, Cascade, Belt, Kevin,
Conrad, Sunburst, Wolf Creek, Black Eagle, Great Falls, Augusta,
Kiowa, Heart Butte, Fairfield, Fort Shaw, Choteau, and Valier
122 PM MDT Fri May 29 2026

...FLOOD WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH MONDAY
AFTERNOON...

* WHAT...Flooding caused by excessive rainfall and runoff from
  snowmelt is possible.

* WHERE...Portions of central and north central Montana, including
  the following areas, in central Montana, Gates of the Mountains.
  In north central Montana, Cascade County below 5000ft, East
  Glacier Park Region, Eastern Glacier, Western Toole, and Central
  Pondera, Eastern Pondera and Eastern Teton, Northern High Plains,
  Southern High Plains and Southern Rocky Mountain Front.

* WHEN...From Saturday afternoon through Monday afternoon.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Creeks and streams may rise out of their banks.

* ADDITIONAL DETAILS...
  - Rainfall amounts of 1 to 3 inches with a 10% chance for 4
    inches along and west of the I-15 corridor are possible. The
    window for the heaviest rainfall will be between Saturday
    afternoon through Sunday morning. Light to moderate rainfall
    lingers Sunday afternoon through at least Monday. The
    greatest impacts will be along creeks and rivers emanating
    from the Rocky Mountain Front, including but not limited to
    the Sun River, Marias River, and Saint Mary River. Rural
    roads may become impassable.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.

&&

$$

Wilson

Flood Watch
National Weather Service Missoula MT
1213 PM MDT Fri May 29 2026

.Heavy rain combined with mountain snowpack melt may cause flows in
streams and rivers to increase quickly and reach critical levels.

MTZ002-003-301800-
/O.NEW.KMSO.FA.A.0004.260531T0000Z-260601T1800Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
West Glacier Region-Flathead/Mission Valleys-
1213 PM MDT Fri May 29 2026

...FLOOD WATCH IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY
MORNING...

* WHAT...Flooding caused by rain and snowmelt is possible.

* WHERE...A portion of northwest Montana, including the following
  areas, Flathead/Mission Valleys and West Glacier Region.

This includes the following Specific Areas...
Kalispell and Going-to-the-Sun Road in Glacier Park.

* WHEN...From Saturday evening through Monday morning.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Rockfall and debris flows are also possible in steep terrain.

* ADDITIONAL DETAILS...
  - Rainfall of 1 to 2 inches for valley locations with 2 to 4 inches
    in the terrain are possible late Saturday through Monday.
  - https://www.weather.gov/mso/hydrology

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.

&&

$$

Flood Watch
National Weather Service Missoula MT
1137 AM MDT Fri May 29 2026

...The National Weather Service in Missoula has issued a Flood Watch
for the following rivers in Montana...

  Flathead River At Columbia Falls affecting Flathead County.

.Heavy rain combined with mountain snowpack melt may cause flows in
rivers to increase quickly and reach critical levels.

For the Flathead River...including At Columbia Falls...flooding is
possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you are in the watch area, remain alert to possible flooding.

Residents and those with interests near the river should monitor
rising water levels and be prepared for possible Flood Warnings.

Additional information is available at www.weather.gov.

The next statement will be issued Saturday afternoon at noon MDT.

&&

MTC029-301800-
/O.NEW.KMSO.FL.A.0006.260530T1200Z-260601T1200Z/
/CFMM8.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.NO/
1137 AM MDT Fri May 29 2026

...FLOOD WATCH IN EFFECT FROM SATURDAY MORNING TO MONDAY MORNING...

* WHAT...Flooding is possible.

* WHERE...Flathead River At Columbia Falls.

* WHEN...From Saturday morning to Monday morning.

* IMPACTS...At 13.0 feet, Farmers crops adjacent to the Flathead
  River are inundated with water. At 14.0 feet, Flooding of farmers
  crops adjacent to the Flathead River is likely. Sections of the
  Steel Bridge Road become inundated with water and impassable.

* ADDITIONAL DETAILS...
  - At 10:45 AM MDT Friday the stage was 13.3 feet.
  - Flood stage is 14.0 feet. Forecast crest is 14.1 feet on Saturday
    afternoon.
  - https://www.weather.gov/mso/hydrology

&&

LAT...LON 4818 11414 4816 11412 4812 11411 4810 11408
      4804 11411 4805 11415 4813 11417 4811 11422
      4818 11430 4825 11426 4833 11425 4838 11421
      4840 11412 4847 11411 4845 11400 4837 11402
      4832 11416 4828 11418 4825 11418 4818 11423

$$

Flood Watch
National Weather Service Missoula MT
1120 AM MDT Fri May 29 2026

...The National Weather Service in Missoula has issued a Flood Watch
for the following rivers in Montana...

  Swan River Near Bigfork affecting Flathead, Lake and Missoula
  Counties.

.Heavy rain combined with mountain snowpack melt may cause flows in
rivers to increase quickly and reach critical levels.

For the Swan River...including Near Bigfork...flooding is possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you are in the watch area, remain alert to possible flooding.

Residents and those with interests near the river should monitor
rising water levels and be prepared for possible Flood Warnings.

Additional information is available at www.weather.gov.

The next statement will be issued Saturday afternoon at noon MDT.

&&

MTC029-047-063-301800-
/O.NEW.KMSO.FL.A.0005.260601T1625Z-260603T0500Z/
/SWRM8.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.NR/
1120 AM MDT Fri May 29 2026

...FLOOD WATCH IN EFFECT FROM MONDAY MORNING TO TUESDAY EVENING...

* WHAT...Flooding is possible.

* WHERE...Swan River Near Bigfork.

* WHEN...From Monday morning to Tuesday evening.

* IMPACTS...At 6.5 feet, Flooding affects low lying areas adjacent to
  the river. At 6.6 feet, Flooding affects low lying areas north of
  Lion Creek Road and adjacent to the river.

* ADDITIONAL DETAILS...
  - At 11:00 AM MDT Friday the stage was 4.8 feet.
  - Forecast...Flood stage may be reached late Monday morning.
  - Flood stage is 6.5 feet. Forecast crest is at 6.6 feet on the
    evening of June 1.
  - https://www.weather.gov/mso/hydrology

&&

LAT...LON 4810 11396 4797 11384 4791 11381 4780 11378
      4768 11376 4751 11365 4749 11375 4752 11378
      4771 11389 4774 11390 4781 11389 4787 11390
      4793 11392 4800 11400 4803 11402 4804 11407
      4805 11410 4809 11408

$$

Flood Watch
National Weather Service Missoula MT
1057 AM MDT Fri May 29 2026

...The National Weather Service in Missoula has issued a Flood Watch
for the following rivers in Montana...

  Clark Fork River Above Missoula affecting Missoula County.

.Heavy rain combined with mountain snowpack melt may cause flows in
rivers to increase quickly and reach critical levels.

For the Clark Fork River...including Above Missoula...flooding is
possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Residents and those with interests near the river should monitor
rising water levels and be prepared for possible Flood Warnings.


Additional information is available at www.weather.gov.

The next statement will be issued Saturday afternoon at noon MDT.

&&

MTC063-301800-
/O.NEW.KMSO.FL.A.0004.260601T0251Z-260605T0700Z/
/ABOM8.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.NO/
1057 AM MDT Fri May 29 2026

...FLOOD WATCH IN EFFECT FROM SUNDAY EVENING TO LATE THURSDAY
NIGHT...

* WHAT...Flooding is possible.

* WHERE...Clark Fork River Above Missoula.

* WHEN...From Sunday evening to late Thursday night.

* IMPACTS...At 7.5 feet, Flooding of low lying areas adjacent to the
  river is possible. Flood waters begin to flood streets in the
  Orchard Homes area, specifically the north end of Tower Street
  including Kehrwald Drive.


* ADDITIONAL DETAILS...
  - At 10:00 AM MDT Friday the stage was 6.1 feet.
  - Forecast...Flood stage may be reached Sunday evening.
  - Flood stage is 7.5 feet. Current forecast crest is at 8.6 feet on
    the evening of June 1.
  - https://www.weather.gov/mso/hydrology

&&

LAT...LON 4690 11395 4691 11390 4690 11387 4684 11382
      4685 11391 4684 11403 4686 11413 4690 11410
      4691 11402

$$

Special Weather Statement

Special Weather Statement
National Weather Service Glasgow MT
616 PM MDT Fri May 29 2026

MTZ016-060-300115-
Southwest Phillips MT-Central and Southeast Phillips MT-
616 PM MDT Fri May 29 2026

...A strong thunderstorm will impact portions of west central
Phillips County through 715 PM MDT
...

At 616 PM MDT, Doppler radar was tracking a strong thunderstorm over
Zortman, moving north at 10 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Zortman and Landusky.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4792 10863 4799 10861 4798 10855 4798 10844
      4814 10843 4813 10826 4785 10829 4785 10875
      4792 10875
TIME...MOT...LOC 0016Z 174DEG 9KT 4793 10853

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

$$

RDJ

Special Weather Statement
National Weather Service Great Falls MT
550 PM MDT Fri May 29 2026

MTZ305-310-311-300030-
Hill County MT-Western and Central Chouteau County MT-
Bears Paw Mountains and Southern Blaine MT-
550 PM MDT Fri May 29 2026

...STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN HILL AND
NORTHEASTERN CHOUTEAU COUNTIES THROUGH 630 PM MDT...

At 550 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Parker School to 20 miles south of Big
Sandy. Movement was northwest at 20 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Big Sandy, Azure, Parker School, Beaver Creek, Agency, Sangrey, St.
Pierre, Boneau, Box Elder, Rocky Boy, Virgelle, and Laredo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4865 10982 4807 11041 4783 11004 4826 10960
TIME...MOT...LOC 2350Z 149DEG 17KT 4824 10969 4789 11004

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

$$

Moldan

Special Weather Statement
National Weather Service Great Falls MT
544 PM MDT Fri May 29 2026

MTZ314-318-300030-
Snowy and Judith Mountains MT-Fergus County below 4500ft MT-
544 PM MDT Fri May 29 2026

...STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN FERGUS COUNTY
THROUGH 630 PM MDT...

At 544 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from Roy to 8 miles north of Grass Range to 25 miles
southeast of Lewistown. Movement was north at 35 mph.

HAZARD...Wind gusts of 45 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Grass Range, Roy, and Valentine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4731 10859 4727 10860 4727 10872 4719 10871
      4718 10874 4710 10874 4708 10860 4683 10896
      4691 10905 4730 10907 4755 10861 4731 10834
TIME...MOT...LOC 2344Z 185DEG 36KT 4734 10898 4715 10879 4691 10895

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

$$

Moldan

Special Weather Statement
National Weather Service Billings MT
543 PM MDT Fri May 29 2026

MTZ036-300030-
Powder River MT-
543 PM MDT Fri May 29 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN POWDER RIVER COUNTY
UNTIL 630 PM MDT...

At 543 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles east of Ashland, or 33 miles west of Broadus, moving north at
20 mph.

HAZARD...Wind gusts up to 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  Mainly rural areas of Northwestern Powder River County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4549 10591 4543 10614 4556 10623 4579 10623
      4579 10590
TIME...MOT...LOC 2343Z 165DEG 18KT 4557 10607

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

$$

McKeown-Robbie

Special Weather Statement
National Weather Service Billings MT
541 PM MDT Fri May 29 2026

MTZ030-031-300030-
Northern Rosebud MT-Treasure MT-
541 PM MDT Fri May 29 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN TREASURE AND
NORTHERN ROSEBUD COUNTIES UNTIL 630 PM MDT...

At 541 PM MDT, Doppler radar was tracking a strong thunderstorm 13
miles southeast of Melstone, or 24 miles northwest of Hysham, and is
mostly stationary.

HAZARD...Wind gusts up to 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  Mainly rural areas of Northwestern Treasure and Northern Rosebud
  Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4663 10782 4663 10757 4640 10758 4638 10765
      4639 10765 4639 10768 4641 10768 4641 10770
      4644 10770 4644 10772 4647 10772 4647 10774
      4648 10774 4648 10776 4650 10776 4650 10780
      4660 10780 4661 10783 4661 10782
TIME...MOT...LOC 2340Z 0DEG 0KT 4647 10767

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

$$

McKeown-Robbie

Special Weather Statement
National Weather Service Glasgow MT
530 PM MDT Fri May 29 2026

MTZ021-300030-
Petroleum MT-
530 PM MDT Fri May 29 2026

...A strong thunderstorm will impact portions of west central
Petroleum County through 630 PM MDT
...

At 528 PM MDT, Doppler radar was tracking a strong thunderstorm 18
miles east of Roy, or 22 miles northwest of Winnett, moving northeast
at 30 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

This storm will remain over mainly rural areas of west central
Petroleum County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4718 10874 4719 10872 4727 10872 4727 10859
      4730 10859 4731 10838 4731 10834 4709 10844
      4709 10861 4710 10861 4710 10874
TIME...MOT...LOC 2328Z 220DEG 26KT 4728 10858

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

$$

RDJ

Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Bismarck ND
633 PM CDT Fri May 29 2026

NDZ001>004-009-010-012-017>020-031>033-040>044-055>062-302345-
Divide-Burke-Renville-Bottineau-Williams-Mountrail-McHenry-
McKenzie-Dunn-Mercer-Oliver-Golden Valley-Billings-Stark-Slope-
Hettinger-Grant-Bowman-Adams-Northwest Ward-
Central and Southern Ward/Minot Area-Western McLean-
Eastern McLean-Western Morton-Eastern Morton-Western Sioux-
Eastern Sioux-
633 PM CDT Fri May 29 2026 /533 PM MDT Fri May 29 2026/

This Hazardous Weather Outlook is for portions of north central
North Dakota, northwest North Dakota, south central North Dakota,
and southwest North Dakota.

.DAY ONE...Tonight

A Wind Advisory is in effect. See weather.gov/bis for details.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotters are asked to provide reports to the NWS using standard
procedures, including through our social media accounts.

$$

Hydrologic Outlook

Hydrologic Outlook
MTC013-015-035-041-045-049-051-059-073-099-101-300600-

Hydrologic Outlook
National Weather Service Great Falls MT
228 PM MDT Fri May 29 2026

What: Heavy heavy rainfall Saturday into Monday.

Where: Greatest impacts will be along and west of the I-15 corridor
of North-Central MT.

Timing: The window for the heaviest rainfall will be between
Saturday afternoon through Sunday morning. Here, rainfall rates of
0.5" to 0.75" every 6 hours are possible. Light to moderate rainfall
lingers through at least Monday.

Details:

Rainfall amounts range from 1 to 3 inches for the area, with a 10%
chance for 4 inches along and west of the I-15 corridor. Additional
snowmelt runoff from the Rocky Mountain Front can enhance creek and
river rises including but not limited to the Sun River, Marias
River, and Saint Mary River. Low lying-areas and poor drainage areas
are also at risk for flooding. Rural dirt roads will be susceptible
to become washed out or impassable.

Due to increasing confidence in flood impacts, a Flood Watch was
issued for areas along and west of the I-15 corridor for
North-Central MT Saturday through Monday. Rivers and creeks are
expected to crest Monday, which can linger impacts for areas prone
to river/creek flooding. Areas farther east of the I-15 corridor are
expected to see lesser flood impacts.

Everyone is reminded that should flooding develop, regardless if the
roadway is paved or not, do not drive through any flood waters, as
you do not know if the road has been washed out under the flood
waters.

Please monitor the National Weather Service or the local media this
weekend for further updates on this spring storm.
$$

Wilson

Hydrologic Outlook
MTC039-063-077-081-301800-

Hydrologic Outlook
National Weather Service Missoula MT
1223 PM MDT Fri May 29 2026

 What: Widespread Moderate to Heavy Precipitation

 Where: West-Central Montana Counties: Missoula, Ravalli, Granite and
 Powell.

 Timing: Saturday May 30 through Monday June 1, 2026

 Relevant factors:
        Total precipitation amounts of 0.5 to 2 inches with locally
        higher amounts possible in higher terrain along the Divide.
        Ongoing snowmelt and recent precipitation has kept stream and
        river levels rising. Anticipate further rises in local
        waterways, rockfall and mudslide potential in steep terrain,
        as well as possible urban and low-land flooding.




$$