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.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service North Platte NE
1045 AM CDT Tue Aug 18 2026
NEZ004>010-022>029-035>038-056>059-069>071-094-191545-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Grant-
Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-
Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
1045 AM CDT Tue Aug 18 2026 /945 AM MDT Tue Aug 18 2026/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...Today and tonight.
Scattered thunderstorms are possible across the area this evening
and tonight. A few storms could be strong to severe. Damaging winds,
large hail, and locally heavy rainfall look to be the primary
threats.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday.
Thunderstorms chances continue Wednesday and Thursday across western
and north central Nebraska, with locally heavy rainfall possible
each day. A couple of storms could be strong to severe through
Thursday, with large hail and damaging winds as the primary threats.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Taylor
Hazardous Weather Outlook
National Weather Service Goodland KS
142 AM MDT Tue Aug 18 2026
COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-190745-
Yuma-Kit Carson-Cheyenne CO-Cheyenne KS-Rawlins-Decatur-Norton-
Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-Greeley-Wichita-
Dundy-Hitchcock-Red Willow-
142 AM MDT Tue Aug 18 2026 /242 AM CDT Tue Aug 18 2026/
This hazardous weather outlook is for extreme southwest Nebraska...
northwest Kansas and east central Colorado.
.DAY ONE...TODAY AND TONIGHT...
Severe storms are possible today, mainly during the evening hours.
Large hail around an inch and wind gusts up to 70 mph are the main
hazards. A brief tornado may be possible as well.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...
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.
$$
Hazardous Weather Outlook
National Weather Service Pueblo CO
1243 AM MDT Tue Aug 18 2026
COZ058>089-093>099-190645-
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-
1243 AM MDT Tue Aug 18 2026
This hazardous weather outlook is for portions of central...east
central...south central and southeast Colorado.
.DAY ONE...Today and Tonight
isolated thunderstorms will be possible by late this afternoon and
into the evening hours as a cool front moves down the plains late
today. Isolated heavy rain cannot be ruled out along the I-25
corridor and southern mountains this evening.
Temperatures this afternoon over parts of the plains will be
around 100 degrees, especially from, Pueblo to the Kansas border.
.DAYS TWO THROUGH SEVEN...Wednesday through Monday
On Wednesday, localized heavy rain is expected to occur along
southern mountains and I-25 corridor. Flash flooding will be
possible across the Aspen Acres burn scar. A few marginally
severe storms will be possible on Wednesday over the southern
mountains and plains.
From Thursday into the weekend, it will become very warm again
with temperatures approaching 100F over parts of the plains and
80s in the valleys. Showers and storms will be isolated over the
plains, scattered over the southern mountains and valleys and
scattered to numerous over the Continental Divide region.
Monsoon moisture will return to the region starting early next
week, bringing the threat of heavy rain to the area once again.
.SPOTTER INFORMATION STATEMENT...
Weather spotters will not be needed today or tonight.
$$
Hodanish
