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Home Return to list Severe Thunderstorm Warning 0023 Issued by the Denver / Boulder Forecast Office
Action: New Issued At: 2026-05-21 20:10:12
419
WUUS55 KBOU 220109
SVRBOU
COC001-005-121-220145-
/O.NEW.KBOU.SV.W.0023.260522T0109Z-260522T0145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
709 PM MDT Thu May 21 2026
The National Weather Service in Denver has issued a
* Severe Thunderstorm Warning for...
Southeastern Adams County in northeastern Colorado...
Eastern Arapahoe County in northeastern Colorado...
Southwestern Washington County in northeastern Colorado...
* Until 745 PM MDT.
* At 709 PM MDT, a severe thunderstorm was located near Cottonwood
Valley, or 24 miles north of Limon, moving east at 20 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.
* Locations impacted include...
Last Chance, Cottonwood Valley and Woodlin School.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Anyone outdoors should move to shelter inside a well-built structure
and stay away from windows. This storm is capable of producing
dangerous hail and damaging winds.
&&
LAT...LON 3974 10390 3982 10390 3983 10344 3957 10343
3957 10389
PARTITION...608005
TIME...MOT...LOC 0109Z 257DEG 17KT 3960 10376
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
63
Action: Cancelled Issued At: 2026-05-21 20:24:12
828
WWUS55 KBOU 220123
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
723 PM MDT Thu May 21 2026
COC001-220133-
/O.CAN.KBOU.SV.W.0023.000000T0000Z-260522T0145Z/
Adams CO-
723 PM MDT Thu May 21 2026
...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTHEASTERN ADAMS
COUNTY...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
&&
LAT...LON 3973 10373 3974 10373 3974 10371 3977 10371
3977 10344 3957 10343 3957 10377
TIME...MOT...LOC 0109Z 257DEG 17KT 3961 10376
$$
COC005-121-220145-
/O.CON.KBOU.SV.W.0023.000000T0000Z-260522T0145Z/
Arapahoe CO-Washington CO-
723 PM MDT Thu May 21 2026
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM MDT FOR
EASTERN ARAPAHOE AND WASHINGTON COUNTIES...
At 723 PM MDT, a severe thunderstorm was located 7 miles east of
Cottonwood Valley, or 24 miles north of Limon, moving east at 20 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Last Chance.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.
&&
LAT...LON 3973 10373 3974 10373 3974 10371 3977 10371
3977 10344 3957 10343 3957 10377
PARTITION...608005
TIME...MOT...LOC 0109Z 257DEG 17KT 3961 10376
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
63
Action: Continued Issued At: 2026-05-21 20:24:12
828
WWUS55 KBOU 220123
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
723 PM MDT Thu May 21 2026
COC001-220133-
/O.CAN.KBOU.SV.W.0023.000000T0000Z-260522T0145Z/
Adams CO-
723 PM MDT Thu May 21 2026
...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTHEASTERN ADAMS
COUNTY...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
&&
LAT...LON 3973 10373 3974 10373 3974 10371 3977 10371
3977 10344 3957 10343 3957 10377
TIME...MOT...LOC 0109Z 257DEG 17KT 3961 10376
$$
COC005-121-220145-
/O.CON.KBOU.SV.W.0023.000000T0000Z-260522T0145Z/
Arapahoe CO-Washington CO-
723 PM MDT Thu May 21 2026
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM MDT FOR
EASTERN ARAPAHOE AND WASHINGTON COUNTIES...
At 723 PM MDT, a severe thunderstorm was located 7 miles east of
Cottonwood Valley, or 24 miles north of Limon, moving east at 20 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Last Chance.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.
&&
LAT...LON 3973 10373 3974 10373 3974 10371 3977 10371
3977 10344 3957 10343 3957 10377
PARTITION...608005
TIME...MOT...LOC 0109Z 257DEG 17KT 3961 10376
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
63
Action: Expired Issued At: 2026-05-21 20:46:43
463
WWUS55 KBOU 220146
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
746 PM MDT Thu May 21 2026
COC005-121-220156-
/O.EXP.KBOU.SV.W.0023.000000T0000Z-260522T0145Z/
Arapahoe CO-Washington CO-
746 PM MDT Thu May 21 2026
...SEVERE THUNDERSTORM WARNING HAS EXPIRED FOR EASTERN ARAPAHOE AND
WASHINGTON COUNTIES...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire. However, small
hail, gusty winds, and heavy rain are still possible with this
thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1000 PM MDT
Thursday for a portion of northeast Colorado.
&&
LAT...LON 3973 10373 3974 10373 3974 10371 3977 10371
3977 10344 3957 10343 3957 10377
PARTITION...608005
TIME...MOT...LOC 0123Z 257DEG 17KT 3962 10367
$$
63
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