Air Quality Alert
COC035-001-031-013-014-069-005-059-123-160600-
Douglas-Adams-Denver-Boulder-Broomfield-Larimer-Arapahoe-
Jefferson-Weld-
310 PM MDT Fri May 15 2026
...OZONE ACTION DAY ALERT FROM 200 PM FRIDAY UNTIL 1200 AM
SATURDAY...
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...200 PM Friday May 15 to 1200 AM Saturday May 16
IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. Ozone may reach the Unhealthy for Sensitive
Groups category on Friday. The highest concentrations are expected
in Denver, Greeley, and surrounding areas. Stronger winds on
Saturday will limit ozone, and Good to Moderate concentrations are
expected. For Colorado air quality conditions, forecasts, and
advisories, visit:
https://www.colorado.gov/airquality/colorado_summary.aspx If
possible, please help us reduce pollution by limiting driving gas
and diesel-powered vehicles until at least 4 PM Saturday, May 16,
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.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service North Platte NE
709 PM CDT Fri May 15 2026
NEZ004>010-022>029-035>038-056>059-069>071-094-170015-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Grant-
Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-
Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
709 PM CDT Fri May 15 2026 /609 PM MDT Fri May 15 2026/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...Tonight.
Hazardous weather is not expected at this time.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
A Slight Risk (level 2 of 5) for severe weather is in place for much
of western and north central Nebraska on Saturday. An Enhanced Risk
(level 3 of 5) near and south of Interstate 80. The concern is
scattered thunderstorms, potentially developing as early as early
afternoon, capable of very large hail, damaging wind gusts, and a
tornado or two. By late afternoon through mid evening, more
scattered to widespread thunderstorms are likely to move in from
northeast Colorado and northwest Kansas. Damaging wind gusts are the
primary concern late evening and overnight.
Additional strong to severe thunderstorms are likely Sunday as a
cold front progresses eastward. The area of greatest concern is near
and east of Highway 83. Very large hail, damaging wind gusts, and
even a tornado or two are possible.
.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed Saturday afternoon and evening.
$$
