Air Quality Alert
WYZ005-221900-
Southwest Bighorn Basin-
Including the city of Thermopolis
1045 PM MDT Thu Aug 21 2025
...AIR QUALITY ALERT IN EFFECT UNTIL 1 PM MDT FRIDAY...
The following message is transmitted on behalf of the Wyoming
Department of Environmental Quality, Air Quality Division, and the
Wyoming Department of Health.
* WHAT...Air Quality Alert for Wildfire Smoke.
* WHERE...Hot Springs County, mainly near the Red Canyon Wildfire in
eastern Hot Springs County.
* WHEN...1 PM Thursday August 21 through 1 PM Friday August 22.
* IMPACTS...Smoke from the Red Canyon Fire, will continue to spread
across the area today into Friday morning.
HEALTH INFORMATION...The Wyoming Department of Health recommends
that the elderly, young children, and individuals with respiratory
problems avoid excessive physical exertion and minimize outdoor
activities during this time. Wildfire smoke is made up of a variety
of pollutants, including particulate matter and ozone, which can
cause respiratory health effects. Although these people are most
susceptible to health impacts, the Department of Health also advises
that everyone should avoid prolonged exposure to poor air quality
conditions.
CURRENT CONDITIONS...The Wyoming Department of Environmental
Quality, Air Quality Division offers near real-time air quality data
for Wyoming`s monitoring stations and health effects information to
help the public interpret current conditions. Current air quality
conditions across the state of Wyoming can be found at
http://www.wyvisnet.com/.
$$
COC123-005-035-069-001-059-014-013-031-220600-
Weld-Arapahoe-Douglas-Larimer-Adams-Jefferson-Broomfield-
Boulder-Denver-
410 PM MDT Thu Aug 21 2025
...OZONE ACTION DAY ALERT FROM 400 PM THURSDAY UNTIL 1200 AM
FRIDAY...
The Colorado Department of Public Health and Environment has
issued the following...
WHAT...Ozone Action Day Alert.
WHERE...Douglas, Jefferson, Denver, western Arapahoe, western
Adams, Broomfield, Boulder, Larimer, and Weld Counties
WHEN...400 PM Thursday August 21 to 1200 AM Friday August 22
IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. Hot, stagnant weather will allow ozone to
reach the Unhealthy for Sensitive Groups category on Thursday. On
Friday, unsettled weather and scattered showers will keep ozone in
the Good to Moderate range. For Colorado air quality conditions,
forecasts, and advisories, visit:
https://www.colorado.gov/airquality/colorado_summary.aspx If
possible, please help us reduce ozone pollution by limiting
driving gas and diesel-powered vehicles until midnight, Thursday
night, August 21, 2025. Colorado is also addressing ozone
pollution through state policies. For more information about
health impacts and how ozone pollution forms in Colorado, visit:
https://cdphe.colorado.gov/ozone-pollution-and-your-health
HEALTH INFORMATION...Increasing likelihood of respiratory symptoms
and breathing discomfort in active children and adults and people
with lung disease, such as asthma. Active children and adults, and
people with lung disease, such as asthma, should reduce prolonged
or heavy outdoor exertion on Thursday.
$$
WYZ006-007-017-221900-
Southeast Bighorn Basin-Owl Creek and Bridger Mountains-
Wind River Basin-
Including the cities of Ten Sleep, Worland, Riverton, and Shoshoni
1205 PM MDT Thu Aug 21 2025
...AIR QUALITY ALERT IN EFFECT UNTIL 1 PM MDT THIS AFTERNOON...
The following message is transmitted on behalf of the Wyoming
Department of Environmental Quality, Air Quality Division, and the
Wyoming Department of Health.
* WHAT...Air Quality Alert for Wildfire Smoke.
* WHERE...Portions of the Bighorn Basin, Owl Creek and Bridger
Mountains, and the Wind River Basin.
* WHEN...Through 1 PM Thursday, August 21.
* IMPACTS...Smoke from various wildfires across the region, including
the Red Canyon Fire, will continue to spread across the region
today.
HEALTH INFORMATION...The Wyoming Department of Health recommends
that the elderly, young children, and individuals with respiratory
problems avoid excessive physical exertion and minimize outdoor
activities during this time. Wildfire smoke is made up of a variety
of pollutants, including particulate matter and ozone, which can
cause respiratory health effects. Although these people are most
susceptible to health impacts, the Department of Health also advises
that everyone should avoid prolonged exposure to poor air quality
conditions.
CURRENT CONDITIONS...The Wyoming Department of Environmental
Quality, Air Quality Division offers near real-time air quality data
for Wyoming`s monitoring stations and health effects information to
help the public interpret current conditions. Current air quality
conditions across the state of Wyoming can be found at
http://www.wyvisnet.com/.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service North Platte NE
350 PM CDT Thu Aug 21 2025
NEZ004>010-022>029-035>038-056>059-069>071-094-222100-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Grant-
Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-
Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
350 PM CDT Thu Aug 21 2025 /250 PM MDT Thu Aug 21 2025/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...Tonight.
Showers and thunderstorms are expected across portions of northern
Nebraska this evening and overnight. A strong storm or two will be
possible late this evening across northwest Nebraska. Strong, gusty
winds would be the main hazard.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
Additional showers and thunderstorms are expected Friday afternoon
and evening, with a few storms potentially becoming severe. Large
hail and severe wind gusts are the main threats.
Scattered showers and thunderstorms are expected to persist this
weekend into the middle of next week, with the best chances of rain
across western and southwestern Nebraska.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Taylor
Hazardous Weather Outlook
National Weather Service Rapid City SD
243 PM MDT Thu Aug 21 2025
SDZ024>031-041-042-044-047-049-072-074>077-WYZ054>060-221300-
Northern Black Hills-Northern Foothills-Rapid City-
Southern Foothills-Central Black Hills-Southern Black Hills-
Custer Co Plains-Pennington Co Plains-Western Fall River-
Northern Oglala Lakota-Bennett-Todd-Tripp-
Sturgis/Piedmont Foothills-Hermosa Foothills-Eastern Fall River-
Southern Oglala Lakota-Southern Jackson-Northern Campbell-
Southern Campbell-Western Crook-Wyoming Black Hills-
Weston County Plains-Newcastle-Northeastern Crook-
243 PM MDT Thu Aug 21 2025 /343 PM CDT Thu Aug 21 2025/
This Hazardous Weather Outlook is for portions of western South
Dakota and northeastern Wyoming.
.DAY ONE...This Afternoon and Tonight
There is a marginal risk (level 1 of 5) of severe thunderstorms
this evening through tonight, meaning that isolated severe storms
are possible. Primary hazards include damaging winds and large
hail.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday
There is also a marginal risk (level 1 of 5) of severe
thunderstorms on Friday, meaning that isolated severe storms are
possible. Primary hazards include large hail and and damaging
winds.
Overall, it will be much drier beginning on Saturday. However,
isolated storms are possible each day. Organized severe weather
is not expected.
.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed today.
&&
Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity
$$
Hazardous Weather Outlook
National Weather Service Cheyenne WY
212 PM MDT Thu Aug 21 2025
NEZ002-003-019>021-054-055-095-096-WYZ101>119-222015-
Dawes County-Box Butte County-Scotts Bluff County-Banner County-
Morrill County-Kimball County-Cheyenne County-
Northern Sioux County-Southern Sioux County-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
212 PM MDT Thu Aug 21 2025
This hazardous weather outlook is for portions of panhandle
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.
.DAY ONE...THIS AFTERNOON AND TONIGHT
- A marginal risk (1 of 5) of severe weather is expected today,
with the most likely area for stronger storms across the
northern counties of the CWA.
- One last day of hot temperatures will continue through this
afternoon, with the hottest across eastern Wyoming and the
Nebraska Panhandle.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
- A cooler and wetter period is expected to begin Friday through
Wednesday due to abundant cloud cover along with scattered to
numerous showers and thunderstorm activity on most days.
.Spotter information statement...
Spotter activation will not be needed.
$$
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
919 AM MDT Thu Aug 21 2025
COZ030>051-221530-
Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
919 AM MDT Thu Aug 21 2025
This hazardous weather outlook is for northeast and north central
Colorado.
.DAY ONE...Today and Tonight
Record or near record heat will prevail today with highs pushing
into the mid and upper 90s across the I-25 Corridor and Plains.
Only isolated showers and thunderstorms will be possible in the
mountains and over the northern border area late this afternoon
and evening. They will produce just a brief period of light rain
and gusty winds to around 40 mph.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday
A cooler and more active weather pattern can be expected for this
entire period. Scattered thunderstorms will develop Friday
afternoon and evening, and a couple storms may become severe with
large hail and locally heavy rainfall the primary threats. The
weather pattern will remain active this weekend with daily chances
of showers and thunderstorms, although Saturday should see less
activity. A few of these storms may be strong and also produce
locally heavy rain.
Monday will likely see more widespread showers and thunderstorms
and also a greater threat of heavy rainfall. There will be an
increasing potential for flooding as well, so stay tuned to the
latest forecasts. Rain chances will continue through the middle of
next week, with the highest chances in and near the mountains.
.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be needed today or tonight.
$$
Hazardous Weather Outlook
National Weather Service Grand Junction CO
251 AM MDT Thu Aug 21 2025
COZ001>014-017>023-UTZ022>025-027>029-220900-
Lower Yampa River Basin-Central Yampa River Basin-
Roan and Tavaputs Plateaus-Elkhead and Park Mountains-
Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor-
Central Colorado River Basin-Grand and Battlement Mesas-
Gore and Elk Mountains/Central Mountain Valleys-
Central Gunnison and Uncompahgre River Basin-
West Elk and Sawatch Mountains-Flat Tops-Upper Gunnison River Valley-
Uncompahgre Plateau and Dallas Divide-Northwest San Juan Mountains-
Southwest San Juan Mountains-Paradox Valley/Lower Dolores River-
Four Corners/Upper Dolores River-Animas River Basin-
San Juan River Basin-Southeast Utah-Eastern Uinta Mountains-
Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat-
La Sal and Abajo Mountains-Canyonlands/Natural Bridges-
251 AM MDT Thu Aug 21 2025
This Hazardous Weather Outlook is for northwest Colorado, southwest
Colorado, west central Colorado, east central Utah, northeast Utah
and southeast Utah.
.DAY ONE...Today and tonight.
Isolated terrain-based storms are possible this afternoon. Storms
will be capable of producing gusty outflow winds up to 40 mph and
frequent lightning. Light to moderate rainfall will be possible in
some storms over the San Juans. Near record high temperatures
expected.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
Scattered to widespread storms are expected Friday and Saturday, with
the main threats being gusty winds, lightning, and brief heavy rain.
Near record temperatures linger to this point. From Sunday onward,
chances of widespread heavy rain, along with potential flash flooding
or debris flows, will be on the increase. Temperatures will cool
substantially for early next week.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Hazardous Weather Outlook
National Weather Service Riverton WY
210 AM MDT Thu Aug 21 2025
WYZ001>020-022>030-221300-
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-
210 AM MDT Thu Aug 21 2025
This Hazardous Weather Outlook is for Western and Central Wyoming.
.DAY ONE...Today and tonight.
Showers and thunderstorms are possible for most locations today.
Hazards include lightning and gusty outflow gusts 30 to 50 mph.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
A cooling trend, with daily chances for showers and thunderstorms.
.SPOTTER INFORMATION STATEMENT...
Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.
$$
