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Home Return to list Severe Thunderstorm Warning 0018 Issued by the Denver / Boulder Forecast Office
Action: New Issued At: 2026-05-21 17:33:36
235
WUUS55 KBOU 212233
SVRBOU
COC001-005-121-212315-
/O.NEW.KBOU.SV.W.0018.260521T2233Z-260521T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
433 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 515 PM MDT.
* At 433 PM MDT, a severe thunderstorm was located near Cottonwood
Valley, or 26 miles north of Limon, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter 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, Woodlin School and Cottonwood Valley.
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 3974 10384 3979 10384 3980 10345 3957 10343
3957 10383
PARTITION...608005
TIME...MOT...LOC 2233Z 264DEG 20KT 3964 10374
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
63
Action: Continued Issued At: 2026-05-21 17:44:36
524
WWUS55 KBOU 212244
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
444 PM MDT Thu May 21 2026
COC001-212254-
/O.CAN.KBOU.SV.W.0018.000000T0000Z-260521T2315Z/
Adams CO-
444 PM MDT Thu May 21 2026
...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTHEASTERN ADAMS
COUNTY...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
&&
LAT...LON 3973 10372 3974 10372 3974 10371 3979 10371
3980 10345 3957 10343 3957 10375
TIME...MOT...LOC 2233Z 264DEG 20KT 3964 10374
$$
COC005-121-212315-
/O.CON.KBOU.SV.W.0018.000000T0000Z-260521T2315Z/
Arapahoe CO-Washington CO-
444 PM MDT Thu May 21 2026
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR
EASTERN ARAPAHOE AND WASHINGTON COUNTIES...
At 444 PM MDT, a severe thunderstorm was located 7 miles southwest of
Last Chance, or 26 miles north of Limon, moving east at 25 mph.
HAZARD...Ping pong 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 and Woodlin School.
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.
Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.
&&
LAT...LON 3973 10372 3974 10372 3974 10371 3979 10371
3980 10345 3957 10343 3957 10375
PARTITION...608005
TIME...MOT...LOC 2233Z 264DEG 20KT 3964 10374
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
63
Action: Cancelled Issued At: 2026-05-21 17:44:36
524
WWUS55 KBOU 212244
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
444 PM MDT Thu May 21 2026
COC001-212254-
/O.CAN.KBOU.SV.W.0018.000000T0000Z-260521T2315Z/
Adams CO-
444 PM MDT Thu May 21 2026
...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTHEASTERN ADAMS
COUNTY...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
&&
LAT...LON 3973 10372 3974 10372 3974 10371 3979 10371
3980 10345 3957 10343 3957 10375
TIME...MOT...LOC 2233Z 264DEG 20KT 3964 10374
$$
COC005-121-212315-
/O.CON.KBOU.SV.W.0018.000000T0000Z-260521T2315Z/
Arapahoe CO-Washington CO-
444 PM MDT Thu May 21 2026
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR
EASTERN ARAPAHOE AND WASHINGTON COUNTIES...
At 444 PM MDT, a severe thunderstorm was located 7 miles southwest of
Last Chance, or 26 miles north of Limon, moving east at 25 mph.
HAZARD...Ping pong 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 and Woodlin School.
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.
Tornadoes can develop quickly from severe thunderstorms. Seek shelter
immediately in an interior room on the lowest floor of a well-built
structure.
&&
LAT...LON 3973 10372 3974 10372 3974 10371 3979 10371
3980 10345 3957 10343 3957 10375
PARTITION...608005
TIME...MOT...LOC 2233Z 264DEG 20KT 3964 10374
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
63
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