Severe Thunderstorm Watch
SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 612
NWS STORM PREDICTION CENTER NORMAN OK
450 PM MDT FRI AUG 21 2026
SEVERE THUNDERSTORM WATCH 612 IS IN EFFECT UNTIL 1100 PM MDT
FOR THE FOLLOWING LOCATIONS
NEC007-013-031-033-045-049-069-075-105-123-157-161-165-220500-
/O.NEW.KWNS.SV.A.0612.260821T2250Z-260822T0500Z/
NE
. NEBRASKA COUNTIES INCLUDED ARE
BANNER BOX BUTTE CHERRY
CHEYENNE DAWES DEUEL
GARDEN GRANT KIMBALL
MORRILL SCOTTS BLUFF SHERIDAN
SIOUX
$$
ATTN...WFO...CYS...LBF...
Special Weather Statement
Special Weather Statement
National Weather Service Denver CO
440 PM MDT Fri Aug 21 2026
COZ039-040-043-212330-
Central and South Weld County CO-North Douglas County Below
6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield
County CO-Boulder And Jefferson Counties Below 6000 Feet/West
Broomfield County CO-
440 PM MDT Fri Aug 21 2026
...A SHOWER WILL IMPACT DENVER...ARAPAHOE...SOUTHWESTERN WELD...
WESTERN ADAMS...BROOMFIELD...NORTHEASTERN JEFFERSON...NORTH CENTRAL
DOUGLAS AND BOULDER COUNTIES UNTIL 530 PM MDT...
At 440 PM MDT, Doppler radar was tracking a shower 5 miles northwest
of Denver, moving southeast at 5 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Denver, Aurora, eastern Lakewood, Thornton, Arvada, Westminster,
Centennial, Broomfield, northern Highlands Ranch, Commerce City,
Littleton, Northglenn, Brighton, Englewood, Wheat Ridge, Lafayette
and Louisville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
Prepare for sudden gusty winds. Secure loose objects and move to a
safe shelter inside a building or vehicle.
&&
LAT...LON 3992 10521 4009 10501 3989 10450 3988 10450
3960 10465 3962 10468 3961 10473 3958 10474
3957 10477 3955 10476 3954 10504
TIME...MOT...LOC 2240Z 309DEG 5KT 3979 10499
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
$$
Aponte
Air Quality Alert
COC001-014-123-031-069-035-059-013-005-222200-
Adams-Broomfield-Weld-Denver-Larimer-Douglas-Jefferson-
Boulder-Arapahoe-
410 PM MDT Fri Aug 21 2026
...OZONE ACTION DAY ALERT FROM 400 PM FRIDAY UNTIL 400 PM
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...400 PM Friday August 21 to 400 PM Saturday August 22
IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. Continued hot and sunny conditions will
allow ozone to reach the Unhealthy for Sensitive Groups category
on Friday and Saturday.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.
Saturday, August 22, 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.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service North Platte NE
355 PM CDT Fri Aug 21 2026
NEZ004>010-022>029-035>038-056>059-069>071-094-222100-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Grant-
Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-
Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
355 PM CDT Fri Aug 21 2026 /255 PM MDT Fri Aug 21 2026/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...Tonight.
Another round of storms may develop across western and north central
Nebraska late tonight. Large hail, damaging winds and heavy rain are
the main severe threats. There is the potential for flooding across
portions of north central and central Nebraska if thunderstorms
continue to develop over the same area late tonight.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
Thunderstorms will continue to be possible daily from Saturday
through Thursday. At this time, the severe threat is uncertain.
.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed.
$$
Hazardous Weather Outlook
National Weather Service Pueblo CO
221 PM MDT Fri Aug 21 2026
COZ058>089-093>099-222030-
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-
221 PM MDT Fri Aug 21 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 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.
$$
SKELLY/SKELLY
Hazardous Weather Outlook
National Weather Service Goodland KS
1124 AM MDT Fri Aug 21 2026
COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-221730-
Yuma-Kit Carson-Cheyenne CO-Cheyenne KS-Rawlins-Decatur-Norton-
Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-Greeley-Wichita-
Dundy-Hitchcock-Red Willow-
1124 AM MDT Fri Aug 21 2026 /1224 PM CDT Fri Aug 21 2026/
This hazardous weather outlook is for extreme southwest Nebraska...
northwest Kansas and east central Colorado.
.DAY ONE...TODAY AND TONIGHT...
A few severe storms are possible this evening into tonight, mainly
north of I-70 after sunset. Damaging winds and large hail are the
main hazards. Low confidence in thunderstorm development and
coverage.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...
A few severe storms capable of producing localized wind gusts up to
65 mph are possible Saturday evening into early Sunday morning,
mainly in northeast Colorado and nearby Kansas and Nebraska border
counties. Low confidence in thunderstorm development and coverage.
.SPOTTER INFORMATION STATEMENT...
Spotters are encouraged to report significant weather conditions.
$$
