Air Quality Alert
COC035-031-013-069-005-123-059-001-014-212200-
Douglas-Denver-Boulder-Larimer-Arapahoe-Weld-Jefferson-
Adams-Broomfield-
410 PM MDT Thu Aug 20 2026
...OZONE ACTION DAY ALERT FROM 400 PM THURSDAY UNTIL 400 PM
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 20 to 400 PM Friday August 21
IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. Hot, sunny, and stagnant weather will allow
ozone to reach the Unhealthy for Sensitive Groups concentration on
Thursday and Friday. The highest concentrations are expected in
southern and western portions of the Denver Metro Area. 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 at least 4 p.m.
Friday, August 21, 2026. 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.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Goodland KS
1124 AM MDT Fri Aug 21 2026
COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-221730-
Yuma-Kit Carson-Cheyenne CO-Cheyenne KS-Rawlins-Decatur-Norton-
Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-Greeley-Wichita-
Dundy-Hitchcock-Red Willow-
1124 AM MDT Fri Aug 21 2026 /1224 PM CDT Fri Aug 21 2026/
This hazardous weather outlook is for extreme southwest Nebraska...
northwest Kansas and east central Colorado.
.DAY ONE...TODAY AND TONIGHT...
A few severe storms are possible this evening into tonight, mainly
north of I-70 after sunset. Damaging winds and large hail are the
main hazards. Low confidence in thunderstorm development and
coverage.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...
A few severe storms capable of producing localized wind gusts up to
65 mph are possible Saturday evening into early Sunday morning,
mainly in northeast Colorado and nearby Kansas and Nebraska border
counties. Low confidence in thunderstorm development and coverage.
.SPOTTER INFORMATION STATEMENT...
Spotters are encouraged to report significant weather conditions.
$$
Hazardous Weather Outlook
National Weather Service North Platte NE
1136 AM CDT Fri Aug 21 2026
NEZ004>010-022>029-035>038-056>059-069>071-094-221645-
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-
1136 AM CDT Fri Aug 21 2026 /1036 AM MDT Fri Aug 21 2026/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...This afternoon and tonight.
Scattered thunderstorms will continue through the afternoon. A
second round of storms may develop across western and north central
Nebraska late tonight. Large hail and damaging winds are the main
severe threats.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
Thunderstorms will continue to be possible daily from Saturday
through Thursday. At this time, the severe threat is uncertain.
.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed.
$$
Hazardous Weather Outlook
National Weather Service Pueblo CO
1245 AM MDT Fri Aug 21 2026
COZ058>089-093>099-221300-
Western Mosquito Range/East Lake County Above 11000 Feet-
Leadville Vicinity/Lake County Below 11000 Feet-
Eastern Sawatch Mountains Above 11000 Feet-
Western Chaffee County Between 9000 and 11000 Feet-
Central Chaffee County Below 9000 Feet-
Western Mosquito Range/East Chaffee County Above 9000 Feet-
Saguache County West of Continental Divide Below 10000 Feet-
Saguache County East of Continental Divide Below 10000 Feet-
La Garita Mountains Above 10000 Feet-
Upper Rio Grande Valley/Eastern San Juan Mountains Below
10000 Feet-Eastern San Juan Mountains Above 10000 Feet-
Del Norte Vicinity/Northern San Luis Valley Below 8500 Feet-
Alamosa Vicinity/Central San Luis Valley Below 8500 Feet-
Southern San Luis Valley-
Northern Sangre de Cristo Mountains Between 8500 And 11000 Feet-
Northern Sangre de Cristo Mountains Above 11000 Feet-
Southern Sangre de Cristo Mountains Between 7500 and 11000 Feet-
Southern Sangre de Cristo Mountains Above 11000 Feet-
Northwestern Fremont County Above 8500 Feet-
Western/Central Fremont County Below 8500 Feet-
Wet Mountain Valley Below 8500 Feet-
Wet Mountains between 6300 and 10000 Feet-
Wet Mountains Above 10000 Feet-
Teller County/Rampart Range Above 7500 Feet/Pikes Peak Between
7500 And 11000 Feet-Pikes Peak Above 11000 Feet-
Canon City Vicinity/Eastern Fremont County-
Northern El Paso County/Monument Ridge/Rampart Range Below
7500 Feet-
Colorado Springs Vicinity/Southern El Paso County/Rampart Range
Below 7400 Feet-Pueblo Vicinity/Pueblo County Below 6300 Feet-
Walsenburg Vicinity/Upper Huerfano River Basin Below 7500 Feet-
Trinidad Vicinity/Western Las Animas County Below 7500 Feet-
Crowley County-La Junta Vicinity/Otero County-
Eastern Las Animas County-Western Kiowa County-
Eastern Kiowa County-Las Animas Vicinity/Bent County-
Lamar Vicinity/Prowers County-Springfield Vicinity/Baca County-
1245 AM MDT Fri Aug 21 2026
This hazardous weather outlook is for portions of central...east
central...south central and southeast Colorado.
.DAY ONE...Today and Tonight
Isolated to scattered showers and thunderstorms are anticipated
across the higher terrain and nearby adjacent plains this afternoon
through early evening, with the main threats being cloud to ground
lightning and wind gusts to 50 mph. If a storm happens to move
over the Aspen Acres burn scar, flash flooding could occur.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday
There will be a daily shot of showers and thunderstorms, initiating
over the higher terrain by midday, then spreading across the I-25
Corridor and adjacent plains through the evening hours. Main threats
will be wind gusts to 50 mph, cloud to ground lightning, periods of
moderate to heavy rainfall and small hail. There are indications of
possibly some stronger storms near the Kansas border Sunday
afternoon and evening.
The threat for flash flooding, particularly for area burn scars,
increases starting Saturday and remains elevated each day through
Tuesday due to the potential coverage and frequency of
thunderstorms.
.SPOTTER INFORMATION STATEMENT...
Weather conditions that meet reporting criteria for spotters will
be possible over portions of the region.
$$
27/27
