Special Weather Statement

Special Weather Statement
National Weather Service Rapid City SD
527 PM MDT Mon Apr 21 2025

SDZ012-WYZ055>060-220045-
Butte SD-Wyoming Black Hills WY-Western Crook WY-
Southern Campbell WY-Northeastern Crook WY-Weston County Plains WY-
Newcastle WY-
527 PM MDT Mon Apr 21 2025

...STRONG THUNDERSTORMS WILL IMPACT WEST CENTRAL BUTTE...EAST CENTRAL
CAMPBELL...NORTHWESTERN WESTON AND CROOK COUNTIES THROUGH 645 PM
MDT...

At 527 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from Alzada to 10 miles east of Coal Creek Mine.
Movement was east at 30 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 hail damage to vegetation is
         possible.

Locations impacted include...
Beulah, Hulett, Alva, Carlile, Pine Haven, Devils Tower National
Monument, Inyan Kara Mountain, Warren Peak, Osage, Bear Lodge
Campground, Moorcroft, Colony, Sundance, Upton, Cook Lake, Devils
Tower Junction, Aladdin, and Keyhole Reservoir.

This includes Interstate 90 in Wyoming between Mile Markers 153 and
206.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4500 10457 4499 10406 4506 10404 4505 10378
      4375 10452 4387 10522
TIME...MOT...LOC 2327Z 269DEG 25KT 4502 10442 4396 10508

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

$$

Helgeson

Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Rapid City SD
532 AM MDT Mon Apr 21 2025

SDZ001-002-012>014-024>032-041>044-046-047-049-072>078-WYZ054>060-
221300-
Harding-Northern Perkins-Butte-Northern Meade Co Plains-Ziebach-
Northern Black Hills-Northern Foothills-Rapid City-
Southern Foothills-Central Black Hills-Southern Black Hills-
Custer Co Plains-Pennington Co Plains-Haakon-Western Fall River-
Northern Oglala Lakota-Northern Jackson-Bennett-Mellette-Todd-
Tripp-Sturgis/Piedmont Foothills-Southern Meade Co Plains-
Hermosa Foothills-Eastern Fall River-Southern Oglala Lakota-
Southern Jackson-Southern Perkins-Northern Campbell-
Southern Campbell-Western Crook-Wyoming Black Hills-
Weston County Plains-Newcastle-Northeastern Crook-
532 AM MDT Mon Apr 21 2025 /632 AM CDT Mon Apr 21 2025/

This Hazardous Weather Outlook is for portions of western South
Dakota and northeastern Wyoming.

.DAY ONE...Today and Tonight

Isolated thunderstorms are expected across much of the area this
afternoon and evening. Severe thunderstorms are not expected at
this time, but gusty winds and small hail could accompany a
stronger storm or two. The grassland fire danger index will be in
the very high category this afternoon across parts of far
southwest South Dakota.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

There is a slight chance for thunderstorms across far southern
South Dakota Wednesday afternoon and evening. Severe thunderstorms
are not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

$$

Hazardous Weather Outlook
National Weather Service Aberdeen SD
312 AM CDT Mon Apr 21 2025

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-220815-
Traverse-Big Stone-Corson-Campbell-McPherson-Brown-Marshall-Roberts-
Walworth-Edmunds-Day-Dewey-Potter-Faulk-Spink-Clark-Codington-Grant-
Hamlin-Deuel-Stanley-Sully-Hughes-Hyde-Hand-Jones-Lyman-Buffalo-
312 AM CDT Mon Apr 21 2025 /212 AM MDT Mon Apr 21 2025/

This Hazardous Weather Outlook is for west central Minnesota,
central South Dakota, north central South Dakota and northeast
South Dakota.

.DAY ONE...Today and tonight.

Showers and thunderstorms will push northeast across the area late
this afternoon through tonight. No severe weather is anticipated,
however, brief wind gusts of 40 to 50 mph is possible with any of
these thunderstorms, mainly over central SD.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Near critical fire conditions Tuesday with wind gusts of 25 to 35
mph out of the west, highest over north central South Dakota.
Relative humidity will also drop between 20 to 30% Tuesday afternoon,
lowest over central South Dakota. The Grassland Fire Danger Index is
High to Very High meaning any fires that ignite could spread
quickly.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

$$