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.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service North Platte NE
1136 AM CDT Fri Aug 21 2026
NEZ004>010-022>029-035>038-056>059-069>071-094-221645-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Grant-
Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-
Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
1136 AM CDT Fri Aug 21 2026 /1036 AM MDT Fri Aug 21 2026/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...This afternoon and tonight.
Scattered thunderstorms will continue through the afternoon. A
second round of storms may develop across western and north central
Nebraska late tonight. Large hail and damaging winds are the main
severe threats.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
Thunderstorms will continue to be possible daily from Saturday
through Thursday. At this time, the severe threat is uncertain.
.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed.
$$
