Red Flag Warning
URGENT - FIRE WEATHER MESSAGE
National Weather Service Cheyenne WY
103 PM MDT Mon Apr 20 2026
...NEW RED FLAG WARNING IN EFFECT TUESDAY AND WEDNESDAY...
.RED FLAG WARNING FROM 11AM TUESDAY THROUGH 8PM WEDNESDAY.
NEZ434>437-WYZ417-418-430>433-210315-
/O.NEW.KCYS.FW.W.0018.260421T1700Z-260423T0200Z/
/O.CON.KCYS.FW.W.0017.000000T0000Z-260421T0200Z/
Pine Ridge/Nebraska National Forest-
Box Butte/South Sioux/Niobrara River-
Lower North Platte River Basin/Scottsbluff National Monument-
Lodgepole Creek/Southern Nebraska Panhandle-
Niobrara/Lower Elevations of Converse/Thunder Basin National
Grassland-
Middle North Platte River Basin/Niobrara and Converse High Plains-
Laramie Foothills and High Plains-Laramie East High Plains-
Bordeaux/Chugwater/Wheatland-Goshen/Middle-
Lower North Platte River Basin-
103 PM MDT Mon Apr 20 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING
FOR LOW RH AND GUSTY WINDS FOR FIRE WEATHER ZONES 417, 418, 430,
431, 432, 433, 434, 435, 436, AND 437... ...RED FLAG WARNING IN
EFFECT FROM 11 AM TUESDAY TO 8 PM MDT WEDNESDAY FOR LOW RH AND
GUSTY WINDS FOR FIRE WEATHER ZONES 417, 418, 430, 431, 432, 433,
434, 435, 436, AND 437...
The National Weather Service in Cheyenne has issued a Red Flag
Warning, which is in effect from 11 AM Tuesday to 8 PM MDT
Wednesday.
* AFFECTED AREA...Fire weather zones 417, 418, and 430 through
437.
* WIND... Southerly winds 10 to 15 mph on Tuesday with gusty
erratic showers in the afternoon. Southwest winds with gusts
between 30 and 45 mph on Wednesday.
* HUMIDITY...5 to 10 percent on Tuesday and 10 to 15 percent on
Wednesday.
* IMPACTS...Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity, and warm temperatures can
contribute to extreme fire behavior.
&&
$$
URGENT - FIRE WEATHER MESSAGE
National Weather Service North Platte NE
130 PM CDT Mon Apr 20 2026
NEZ204-206-208-209-219-210200-
/O.CON.KLBF.FW.W.0025.000000T0000Z-260421T0200Z/
Eastern Panhandle/Crescent Lake NWR-
Sandhills/Valentine NWR/Nebraska National Forest-
Niobrara Valley/Fort Niobrara NWR/Samuel R McKelvie National
Forest-Loup Rivers Basin-Loess Plains-
130 PM CDT Mon Apr 20 2026 /1230 PM MDT Mon Apr 20 2026/
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM CDT /8 PM MDT/
THIS EVENING FOR LOW HUMIDITY AND GUSTY WINDS...
* AFFECTED AREA...Fire Weather Zone 204 Eastern
Panhandle/Crescent Lake NWR, Fire Weather Zone 206
Sandhills/Valentine NWR/Nebraska National Forest, Fire Weather
Zone 208 Niobrara Valley/Fort Niobrara NWR/Samuel R McKelvie
National Forest, Fire Weather Zone 209 Loup Rivers Basin and
Fire Weather Zone 219 Loess Plains.
* TIMING...Noon CDT/11 AM MDT through 9 PM CDT/8 PM MDT.
* WINDS...Southwest 10 to 20 mph with gusts up to 30 mph.
* RELATIVE HUMIDITY...As low as 6 percent.
* TEMPERATURES...Up to 83.
* LIGHTNING...None expected.
* IMPACTS...Any fire starts may rapidly grow and spread.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity, and warm temperatures can
contribute to extreme fire behavior.
&&
$$
URGENT - FIRE WEATHER MESSAGE
National Weather Service Rapid City SD
459 AM MDT Mon Apr 20 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM MDT /NOON CDT/
THIS MORNING TO 8 PM MDT /9 PM CDT/ THIS EVENING FOR GUSTY WINDS
AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 315, 317, 321,
322, 325, 326, 332, 333, 334, AND 335...
.Temperatures will reach into the upper 70s to mid 80s across
portions of northeastern Wyoming and southern South Dakota this
afternoon. Afternoon humidities will drop into the single digits
to low teens. The very warm and dry conditions in combination
with dry fuels and westerly winds gusting up to 30 mph will
support critical fire weather conditions this afternoon. Overnight
humidity recoveries will be poor (less than 55 percent) across
northeastern Wyoming into the Black Hills and southwestern South
Dakota tonight.
SDZ321-322-325-326-332>335-WYZ315-317-210200-
/O.CON.KUNR.FW.W.0018.260420T1700Z-260421T0200Z/
Southern Black Hills-Fall River County Area-Custer County Plains-
Pine Ridge Area-Badlands Area-Bennett County Area-
Mellette and Todd Counties-Tripp County-Southern Campbell-
Weston County Plains-
459 AM MDT Mon Apr 20 2026 /559 AM CDT Mon Apr 20 2026/
...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM MDT /NOON CDT/
THIS MORNING TO 8 PM MDT /9 PM CDT/ THIS EVENING FOR GUSTY WINDS
AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 315, 317, 321,
322, 325, 326, 332, 333, 334, AND 335...
* AFFECTED AREA...Fire Weather Zones 315 Southern Campbell, 317
Weston County Plains, 321 Southern Black Hills, 322 Fall River
County Area, 325 Custer County Plains, 326 Pine Ridge Area,
332 Badlands Area, 333 Bennett County Area, 334 Mellette and
Todd Counties and 335 Tripp County.
* WINDS...West 10 to 20 mph with gusts up to 30 mph.
* RELATIVE HUMIDITY...As low as 8 percent.
* IMPACTS...The combination of dry fuels, low relative
humidities, gusty winds, and hot temperatures will produce
critical fire weather conditions. New fires could spread
rapidly.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity, and warm temperatures can
contribute to extreme fire behavior.
&&
$$
URGENT - FIRE WEATHER MESSAGE
National Weather Service Riverton WY
102 AM MDT Mon Apr 20 2026
WYZ280-289-210200-
/O.CON.KRIW.FW.W.0011.260420T1700Z-260421T0200Z/
Natrona County/Casper BLM-
Granite/Green/Ferris/Rattlesnake Mountains-
102 AM MDT Mon Apr 20 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
8 PM MDT THIS EVENING...
* AFFECTED AREA:
In Central WY...Fire Weather Zones 280 and 289.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In Southwest WY...Sweetwater.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* WIND: West 10 to 20 mph with gusts of 30 to 35 mph.
* HUMIDITY: As low as 9 percent.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions are
either occurring now....or will shortly. A combination of strong
winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
&&
$$
http://weather.gov/riverton
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Bismarck ND
639 PM CDT Mon Apr 20 2026
NDZ031>033-040-041-043-044-212345-
Golden Valley-Billings-Stark-Slope-Hettinger-Bowman-Adams-
539 PM MDT Mon Apr 20 2026
This Hazardous Weather Outlook is for portions of southwest North
Dakota.
.DAY ONE...Tonight
Near critical fire weather conditions could remain through this
evening.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
Strong west to northwest winds are possible Thursday and Friday.
.SPOTTER INFORMATION STATEMENT...
Spotters are asked to provide reports to the NWS using standard
procedures, including through our social media accounts.
$$
Hazardous Weather Outlook
National Weather Service Bismarck ND
639 PM CDT Mon Apr 20 2026
NDZ047-048-050-051-212345-
Logan-La Moure-McIntosh-Dickey-
639 PM CDT Mon Apr 20 2026
This Hazardous Weather Outlook is for portions of southeast North
Dakota.
.DAY ONE...Tonight
Near critical fire weather conditions could remain through this
evening.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
Strong west to northwest winds are possible Thursday and Friday.
.SPOTTER INFORMATION STATEMENT...
Spotters are asked to provide reports to the NWS using standard
procedures, including through our social media accounts.
$$
Hazardous Weather Outlook
National Weather Service Cheyenne WY
448 PM MDT Mon Apr 20 2026
NEZ002-003-019>021-054-055-095-096-WYZ101>119-272300-
Dawes County-Box Butte County-Scotts Bluff County-Banner County-
Morrill County-Kimball County-Cheyenne County-
Northern Sioux County-Southern Sioux County-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
448 PM MDT Mon Apr 20 2026
This text Hazardous Weather Outlook product has been
discontinued as of April 13th 2026. Information formerly contained
within this product can now be found online in graphical form at
https://www.weather.gov/erh/ghwo?wfo=cys and via the NWS Cheyenne
Weather Story and/or social media outlets.
This reminder about the sunset of the text Hazardous Weather Outlook
will remain in place until April 30th 2026.
$$
Hazardous Weather Outlook
National Weather Service North Platte NE
323 PM CDT Mon Apr 20 2026
NEZ004>010-022>029-035>038-056>059-069>071-094-212030-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Grant-
Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-
Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
323 PM CDT Mon Apr 20 2026 /223 PM MDT Mon Apr 20 2026/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...Rest of this afternoon and tonight.
Critical fire weather conditions will continue into this evening
across most of western and north central Nebraska, due to well above
seasonal temperatures, low humidity, and gusty winds.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
Isolated thunderstorms could develop near a dry line across western
Nebraska late Wednesday afternoon. Severe thunderstorm potential is
possible but the severe threat remains uncertain at this time.
A combination of low humidity and gusty winds on both Wednesday and
Thursday may bring a return of near critical to critical fire
weather conditions both days.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Hazardous Weather Outlook
National Weather Service Rapid City SD
454 AM MDT Mon Apr 20 2026
SDZ001-002-012>014-024>032-041>044-046-047-049-072>078-WYZ054>060-
211300-
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-
454 AM MDT Mon Apr 20 2026 /554 AM CDT Mon Apr 20 2026/
This Hazardous Weather Outlook is for portions of western South
Dakota and northeastern Wyoming.
.DAY ONE...Today and Tonight
Very warm and dry conditions along with breezy westerly winds
will create high to very high fire danger across much of the area
today.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
Widespread near-critical to critical fire weather concerns will
continue through Wednesday as hot and dry conditions continue.
Thunderstorms may develop across western South Dakota Wednesday
afternoon. While severe weather is not expected at this time, a
few strong storms could develop and produce strong wind gusts.
.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
$$
Hazardous Weather Outlook
National Weather Service Riverton WY
432 AM MDT Mon Apr 20 2026
WYZ001>020-022>030-211300-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn Basin-
Owl Creek and Bridger Mountains-Bighorn Mountains West-
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-Teton and Gros Ventre Mountains-
Jackson Hole-Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
432 AM MDT Mon Apr 20 2026
...A Red Flag Warning is in effect for portions of central Wyoming
this afternoon...
This Hazardous Weather Outlook is for Western and Central Wyoming.
.DAY ONE...Today and tonight.
Elevated to critical fire weather conditions are expected for most
of the area this afternoon.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
Tuesday through Wednesday...Elevated to critical fire weather
conditions are expected each afternoon.
Wednesday through Friday...An incoming system is expected to bring
cooler temperatures and the potential for moisture across the area.
Accumulating mountain snow could lead to travel impacts over passes.
.SPOTTER INFORMATION STATEMENT...
Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.
$$
Hazardous Weather Outlook
National Weather Service Aberdeen SD
314 AM CDT Mon Apr 20 2026
MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-210815-
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-
314 AM CDT Mon Apr 20 2026 /214 AM MDT Mon Apr 20 2026/
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.
Near critical to critical fire danger is expected today due to relative
humidity values of 15 to 25% across the region in addition to winds
gusting up to 30 to 40 mph during the morning through the afternoon,
strongest over northeastern SD. Avoid any outdoor burning and listen
to local restrictions.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
Dry and windy conditions will lead to increase fire weather concerns
Wednesday.
Strong sustained west-northwest winds of 25 to 35 mph with gusts to
50 mph will be possible on Thursday.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Hazardous Weather Outlook
National Weather Service Sioux Falls SD
138 AM CDT Mon Apr 20 2026
IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-210645-
Lyon-Osceola-Dickinson-Sioux-O`Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory-
Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-
Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton-
Union-
138 AM CDT Mon Apr 20 2026
This Hazardous Weather Outlook is for northwest Iowa, west central
Iowa, southwest Minnesota, northeast Nebraska, central South
Dakota, east central South Dakota, south central South Dakota and
southeast South Dakota.
.DAY ONE...Today.
Near-critical to critical fire danger is expected this afternoon
mainly due to breezy southerly winds and low relative humidity
values. Avoid any outdoor burning and heed local restictions!
.DAYS TWO THROUGH SEVEN...Monday through Saturday.
Continued dry and windy conditions will lead to elevated fire
concerns on Wednesday. Avoid any planned burn activities, and use
caution with all outdoor activities.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
