Flash Flood Watch
Flood Watch
National Weather Service Pocatello ID
549 PM MDT Wed Aug 12 2026
IDZ053-131200-
/O.CON.KPIH.FF.A.0004.260813T1800Z-260814T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Upper Snake River Plain-
Including the cities of Rexburg, St. Anthony, and Idaho Falls
549 PM MDT Wed Aug 12 2026
...FLASH FLOOD WATCH FOR THE BIG ROCK BURN SCAR REMAINS IN EFFECT
FROM THURSDAY AFTERNOON THROUGH THURSDAY EVENING...
* WHAT...Flash flooding and debris flows caused by excessive rainfall
continue to be possible over the Big Rock burn scar.
* WHERE...The Big Rock burn scar near Heise.
* WHEN...From Thursday afternoon through Thursday evening.
* IMPACTS...Heavy rainfall over the Big Rock burn scar is expected
during the period of the watch. Anyone in or near the Big Rock burn
scar should prepare for potential debris flow moving through the
Big Rock burn scar. Be sure to stay up to date with information
from local authorities. Heavy rainfall could trigger flash flooding
and debris flows in and near recent wildfire burn scars.
* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall over the Big Rock burn scar, which may lead to flash
flooding and debris flows.
- Some locations that may experience flash flooding include...
Heise.
- 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.
&&
$$
KB
Flood Watch
National Weather Service Great Falls MT
1242 PM MDT Wed Aug 12 2026
MTZ319-323-131000-
/O.CON.KTFX.FF.A.0004.260812T2200Z-260813T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Helena Valley-Canyon Ferry Area-
Including the cities of Toston, Townsend, Helena, and Winston
1242 PM MDT Wed Aug 12 2026
...FLASH FLOOD WATCH FOR THE HORSE GULCH BURN SCAR REMAINS IN EFFECT
FROM 4 PM MDT THIS AFTERNOON THROUGH LATE TONIGHT...
* WHAT...Flash flooding and debris flows caused by excessive rainfall
continue to be possible over the Horse Gulch burn scar.
* WHERE...A portion of central Montana, including the following
areas, Horse Gulch burn scar, including Riverside Campground.
* WHEN...From 4 PM MDT this afternoon through late tonight.
* IMPACTS...Heavy rainfall over the Horse Gulch burn scar is expected
up to and during the period of the watch. Residents near the Horse
Gulch burn scar should prepare for potential debris flow. Be sure
to stay up to date with information from local authorities. Heavy
rainfall could trigger flash flooding of low-lying areas, urbanized
street flooding, and debris flows in and near recent wildfire burn
scars.
* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall over the Horse Gulch burn scar, which may lead to flash
flooding and debris flows.
- Some locations that may experience flash flooding include...
Horse Gulch burn scar and Riverside Campground.
- For flood safety, go to this web page.
http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
&&
$$
Moldan
Flood Watch
National Weather Service Great Falls MT
1242 PM MDT Wed Aug 12 2026
MTZ320-131200-
/O.NEW.KTFX.FF.A.0005.260814T0000Z-260814T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
/O.CON.KTFX.FF.A.0004.260812T2200Z-260813T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Big Belt, Bridger and Castle Mountains-
Including the cities of Maudlow, Trident, Battle Ridge Pass, Deep
Creek Pass, and Bozeman Pass
1242 PM MDT Wed Aug 12 2026
...FLASH FLOOD WATCH FOR THE HORSE GULCH BURN SCAR IN EFFECT THURSDAY
EVENING...
* WHAT...Flash flooding and debris flows caused by excessive rainfall
are possible over the Horse Gulch burn scar.
* WHERE...A portion of central Montana, including the following
areas, Horse Gulch burn scar, including Riverside Campground.
* WHEN...Thursday evening.
* IMPACTS...Heavy rainfall over the Horse Gulch burn scar is expected
up to and during the period of the watch. Residents near the Horse
Gulch burn scar should prepare for potential debris flow. Be sure
to stay up to date with information from local authorities. Heavy
rainfall could trigger flash flooding of low-lying areas, urbanized
street flooding, and debris flows in and near recent wildfire burn
scars.
* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall over the Horse Gulch burn scar, which may lead to flash
flooding and debris flows. Additional heavy rainfall is possible
on Friday, and additional flood statements may be needed over the
coming days.
- Some locations that may experience flash flooding include...
Horse Gulch burn scar and Riverside Campground.
- For flood safety, go to this web page.
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.
&&
...FLASH FLOOD WATCH FOR THE HORSE GULCH BURN SCAR REMAINS IN EFFECT
FROM 4 PM MDT THIS AFTERNOON THROUGH LATE TONIGHT...
* WHAT...Flash flooding and debris flows caused by excessive rainfall
continue to be possible over the Horse Gulch burn scar.
* WHERE...A portion of central Montana, including the following
areas, Horse Gulch burn scar, including Riverside Campground.
* WHEN...From 4 PM MDT this afternoon through late tonight.
* IMPACTS...Heavy rainfall over the Horse Gulch burn scar is expected
up to and during the period of the watch. Residents near the Horse
Gulch burn scar should prepare for potential debris flow. Be sure
to stay up to date with information from local authorities. Heavy
rainfall could trigger flash flooding of low-lying areas, urbanized
street flooding, and debris flows in and near recent wildfire burn
scars.
* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall over the Horse Gulch burn scar, which may lead to flash
flooding and debris flows.
- Some locations that may experience flash flooding include...
Horse Gulch burn scar and Riverside Campground.
- For flood safety, go to this web page.
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.
&&
$$
Red Flag Warning
URGENT - FIRE WEATHER MESSAGE
National Weather Service Pocatello ID
130 PM MDT Wed Aug 12 2026
...CRITICAL FIRE WEATHER CONDITIONS THURSDAY DUE TO SCATTERED
THUNDERSTORMS...
IDZ410-411-413-422-425-427-475-476-132100-
/O.NEW.KPIH.FW.W.0021.260813T1800Z-260814T0300Z/
Upper Snake River Valley/Idaho Falls BLM-
Centennial Mountains and Snake River Range/Targhee NF-
Caribou Range/Caribou NF-Sawtooth Range/Northern Sawtooth NF-
Middle Snake River Valley/Twin Falls BLM north of the Snake River-
Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls
BLM south of the Snake River-
East Salmon River Mountains/Salmon NF-
Lemhi and Lost River Range/Challis NF-
130 PM MDT Wed Aug 12 2026
...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT THURSDAY FOR
SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 410, 411, 413,
422, 425, 427, 475, AND 476...
The National Weather Service in Pocatello has issued a Red Flag
Warning for scattered thunderstorms, which is in effect from noon
to 9 PM MDT Thursday.
* AFFECTED AREA...Fire Weather Zone 410 Upper Snake River
Valley/Idaho Falls BLM, Fire Weather Zone 411 Centennial
Mountains and Snake River Range/Targhee NF, Fire Weather Zone
413 Caribou Range/Caribou NF, Fire Weather Zone 422 Sawtooth
Range/Northern Sawtooth NF, Fire Weather Zone 425 Middle Snake
River Valley/Twin Falls BLM north of the Snake River, Fire
Weather Zone 427 Goose Creek and Raft River Valley/Southern
Sawtooth NF/Twin Falls BLM south of the Snake River, Fire
Weather Zone 475 East Salmon River Mountains/Salmon NF and
Fire Weather Zone 476 Lemhi and Lost River Range/Challis NF.
* IMPACTS...Frequent lightning will increase risk of new fire
starts.
* THUNDERSTORMS...Scattered coverage with frequent lightning.
* OUTFLOW WINDS...Erratic winds 35 to 45 mph.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly based on these criteria
for Southeastern Idaho:
- Relative humidity at or below 15 percent and wind gusts of at
least 25 mph in the mountains, or 30 mph in the Snake Plain.
- Thunderstorm coverage of 25 percent, without specific rainfall
criteria.
- Other high impact events deemed critical by the National
Weather Service and area fire management agencies.
&&
$$
Lake Wind Advisory
URGENT - WEATHER MESSAGE
National Weather Service Glasgow MT
724 PM MDT Wed Aug 12 2026
MTZ016-017-021>023-131115-
/O.NEW.KGGW.LW.Y.0038.260813T0124Z-260813T1800Z/
Central and Southeast Phillips-Central and Southern Valley-
Petroleum-Garfield-McCone-
Including Devils Creek Rec Area and Fort Peck
724 PM MDT Wed Aug 12 2026
...LAKE WIND ADVISORY IN EFFECT UNTIL NOON MDT THURSDAY...
* WHAT...Northeast winds 15 to 25 mph with gusts up to 35 mph.
* WHERE...Fort Peck Lake.
* WHEN...Until noon MDT Thursday.
* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft.
* ADDITIONAL DETAILS...Wave heights as high as 4 feet are possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Boaters on Fort Peck Lake should use extra caution since strong winds
and rough waves can overturn small craft.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
222 AM MDT Wed Aug 12 2026
MTZ003-130600-
/O.NEW.KMSO.LW.Y.0002.260813T0000Z-260813T0600Z/
Flathead/Mission Valleys-
222 AM MDT Wed Aug 12 2026
...LAKE WIND ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO MIDNIGHT
MDT TONIGHT...
* WHAT...Northeast winds 15 to 25 mph with gusts up to 40 mph
expected.
* WHERE...Flathead Lake and smaller lakes across the Flathead and
Mission Valley region.
* WHEN...From 6 PM this evening to midnight MDT tonight.
* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Boaters on area lakes should use extra caution since strong winds and
rough waves can overturn small craft.
&&
$$
AL
Air Quality Alert
IDC035-049-131830-
Air Quality Alert Message
Idaho Department of Environmental Quality Lewiston ID
Relayed by National Weather Service Missoula MT
1222 PM MDT Wed Aug 12 2026 /1122 AM PDT Wed Aug 12 2026/
...AIR QUALITY ADVISORY FROM THE IDAHO DEPARTMENT OF ENVIRONMENTAL QUALITY
FOR Clearwater and Idaho Counties
outside of reservation boundary
* WHAT... Air Quality Advisory because of degraded air quality due to
wildfire smoke.
Air Quality Index is forecast to be Unhealthy for Sensitive Groups
* WHERE... Clearwater and Idaho Counties outside of reservation boundary
* WHEN... Until 3:00 PM PST 8/14/2026
* IMPACTS... Members of sensitive groups may experience health effects. The
general public is less likely to be affected.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Air pollutants can cause breathing difficult for children, the elderly, as
well as persons with respiratory problems. Those individuals who are
sensitive to increased particulate matter or smoke are encouraged to avoid
prolonged or strenuous outdoor activity during this advisory. Open burning
is prohibited by air quality rule. It is also recommended that all other
individuals limit prolonged or strenuous activity outdoors.
THIS STATEMENT IS ISSUED BY THE IDAHO DEPARTMENT OF ENVIRONMENTAL QUALITY,
AIR QUALITY GROUP
FOR MORE INFORMATION, CONTACT DEQ`s Lewiston Regional Office at (208) 799-
4370
$$
MTC001-023-039-057-063-081-093-131500-
Air Quality Alert
Relayed by National Weather Service Great Falls MT
815 AM MDT Wed Aug 12 2026
...AIR QUALITY ALERT IN EFFECT...
The Montana Department of Environmental Quality has issued an air
quality alert for Beaverhead, Deer Lodge, Granite, Silver Bow,
Madison, Missoula, Ravalli counties in effect until 9AM on 08/13/2026
An Air Quality Alert means that particulates have been trending
upwards and that an exceedance of the 24 hour National Ambient Air
Quality Standard (NAAQS) has occurred or may occur in the near
future.
Elevated particulate levels from wildfire smoke
As of 8AM on 08/12/2026, particulate levels in Dillon are Unhealthy.
As of 8AM on 08/12/2026, particulate levels in Frenchtown and
Missoula are Unhealthy for Sensitive Groups.
As of 8AM on 08/12/2026, particulate levels in Billings, Butte,
Choteau, Columbia Falls, Cut Bank, Great Falls, Hamilton, Havre,
Helena, Lewistown, Libby, Malta, Sleeping Giant, Thompson Falls and
West Yellowstone are Moderate.
When air quality is Unhealthy... State and local health officials
recommend that people with respiratory or heart disease, the elderly,
and children should avoid prolonged exertion; everyone else should
limit prolonged exertion.
When air quality is Unhealthy for Sensitive Groups... State and local
health officials recommend that people with respiratory or heart
disease, the elderly and children should limit prolonged exertion.
When air quality is Moderate... State and local health officials
recommend that unusually sensitive people should consider reducing
prolonged or heavy exertion.
For more information visit the Montana Department of Environmental
Quality at http://todaysair.mtdeq.us
$$
