Air Quality Alert
COC014-001-069-059-031-013-123-005-035-182200-
Broomfield-Adams-Larimer-Jefferson-Denver-Boulder-Weld-
Arapahoe-Douglas-
410 PM MDT Mon Aug 17 2026
...OZONE ACTION DAY ALERT FROM 400 PM MONDAY UNTIL 400 PM
TUESDAY...
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 Monday August 17 to 400 PM Tuesday August 18
IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. A decreasing threat for showers and
thunderstorms along with very warm temperatures will result in
ozone concentrations reaching the Unhealthy for Sensitive Groups
category both Monday and Tuesday during the afternoon and evening
hours. The best chance for those higher ozone levels will be in
and near the Denver metro area, including the local foothills.
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.
Tuesday, August 18, 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.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service North Platte NE
406 PM CDT Mon Aug 17 2026
NEZ004>010-022>029-035>038-056>059-069>071-094-182115-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Grant-
Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-
Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
406 PM CDT Mon Aug 17 2026 /306 PM MDT Mon Aug 17 2026/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...Tonight.
Scattered thunderstorms are possible across the area this evening
and tonight. A few storms could be strong to severe, especially east
of Highway 61. Damaging winds, large to very large hail, and locally
heavy rainfall look to be the primary threats. An isolated tornado
cannot be ruled out.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
Thunderstorms chances continue into midweek across western and north
central Nebraska. Locally heavy rainfall will remain a possibility
each day. Storms could also be strong to severe through Wednesday as
well, with large hail and damaging winds as the primary threats.
.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed.
$$
Hazardous Weather Outlook
National Weather Service Pueblo CO
1114 AM MDT Mon Aug 17 2026
COZ058>089-093>099-181715-
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-
1114 AM MDT Mon Aug 17 2026
This hazardous weather outlook is for portions of central...east
central...south central and southeast Colorado.
.DAY ONE...This Afternoon and Tonight
Isolated to scattered showers and thunderstorms are forecast for
this afternoon and evening from the southern Sangre de Cristo
Mountains, east along the Raton Mesa and New Mexico border. A couple
of these storms could become strong to severe with hail near 3/4
inch in diameter and wind gusts to 55 mph. Heavy rain will accompany
thunderstorms. An isolated thunderstorm may be possible this
afternoon north of the southern Sangre de Cristo Range, including
the Aspen Acres burn scar. Confidence in a cell hitting the burn
scar is low (less than 20 percent), if one does so, it could lead to
flash flooding.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
Strong to severe thunderstorms will be possible on Wednesday.
Storms will fire along the Eastern Mountains, and spread east into
the Plains by the afternoon and evening. Heavy rainfall, large hail
and gusty winds will accompany stronger storms. Flash flooding may
be possible on area burn scars and will need to be monitored.
Monsoonal moisture returns to the area Thursday through Sunday with
near daily afternoon showers and thunderstorm over the Mountains,
spreading into the Plains. Temperatures will also be on the rise,
with highs in the upper 90s to near 100 by the weekend.
.SPOTTER INFORMATION STATEMENT...
Weather conditions that meet reporting criteria for spotters will
be possible over portions of the region.
$$
88/88
Hazardous Weather Outlook
National Weather Service Goodland KS
1110 AM MDT Mon Aug 17 2026
COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-181715-
Yuma-Kit Carson-Cheyenne CO-Cheyenne KS-Rawlins-Decatur-Norton-
Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-Greeley-Wichita-
Dundy-Hitchcock-Red Willow-
1110 AM MDT Mon Aug 17 2026 /1210 PM CDT Mon Aug 17 2026/
This hazardous weather outlook is for extreme southwest Nebraska...
northwest Kansas and east central Colorado.
.DAY ONE...TODAY AND TONIGHT...
An isolated severe storm or two is possible this afternoon and
evening. Hail around one inch in diameter and wind gusts up to 60
mph are possible.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...
Tuesday and Wednesday, the low chances for severe weather during the
afternoon and evening hours continue. Large hail and wind gusts
around 60 mph are the main threats.
.SPOTTER INFORMATION STATEMENT...
Spotters are encouraged to report significant weather conditions.
$$
