Alert archive / Colorado / Tornado Warnings in 2026
Tornado Warning 12, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 1, 2026, 5:28 PM MDT for Washington County, Colorado. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 1, 2026, 5:28 PM MDT (23:28 UTC)
- Expired
- Jun 1, 2026, 6:00 PM MDT
- In force
- 32 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.25 in
County Washington County, CO
The radar
The Goodland radar (KGLD), 127 km from the middle of the area, began a volume at 23:28 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 1, 12:52 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The text
As transmitted.
479
WFUS55 KBOU 012328
TORBOU
COC121-020015-
/O.NEW.KBOU.TO.W.0012.260601T2328Z-260602T0015Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
528 PM MDT Mon Jun 1 2026
The National Weather Service in Denver has issued a
* Tornado Warning for...
Northeastern Washington County in northeastern Colorado...
* Until 615 PM MDT.
* At 528 PM MDT, a severe thunderstorm capable of producing a tornado
was located 7 miles south of Otis, or 18 miles southeast of Akron,
moving northeast at 20 mph.
HAZARD...Tornado and half dollar size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
* Locations impacted include...
Hyde.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
&&
LAT...LON 3999 10297 4005 10300 4017 10279 4001 10279
TIME...MOT...LOC 2327Z 224DEG 19KT 4005 10292
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
$$
MAI2 follow-up statements
229
WWUS55 KBOU 012347
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
547 PM MDT Mon Jun 1 2026
COC121-020015-
/O.CON.KBOU.TO.W.0012.000000T0000Z-260602T0015Z/
Washington CO-
547 PM MDT Mon Jun 1 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR
NORTHEASTERN WASHINGTON COUNTY...
At 547 PM MDT, a severe thunderstorm capable of producing a tornado
was located 8 miles east of Otis, or 21 miles east of Akron, moving
northeast at 20 mph.
HAZARD...Tornado and half dollar size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Hyde.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
&&
LAT...LON 4004 10291 4009 10293 4017 10279 4006 10279
TIME...MOT...LOC 2328Z 224DEG 19KT 4005 10291
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
$$
MAI724 WWUS55 KBOU 020000 RRA SVSBOU Severe Weather Statement National Weather Service Denver CO 600 PM MDT Mon Jun 1 2026 COC121-020010- /O.CAN.KBOU.TO.W.0012.000000T0000Z-260602T0015Z/ Washington CO- 600 PM MDT Mon Jun 1 2026 ...TORNADO WARNING IS CANCELLED FOR NORTHEASTERN WASHINGTON COUNTY... The storm which prompted the warning has weakened below severe limits, and no longer appears capable of producing a tornado. Therefore, the warning has been cancelled. A Severe Thunderstorm Watch remains in effect until 800 PM MDT Monday for a portion of northeast Colorado. && LAT...LON 4004 10291 4009 10293 4017 10279 4006 10279 TIME...MOT...LOC 2347Z 224DEG 19KT 4013 10281 $$ MAI
What forecasters said that day
The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Denver/Boulder, CO wrote its last area forecast discussion before this tornado warning went out at Jun 1, 2:05 PM MDT, 3 hours 23 minutes earlier. Its key messages:
- A chance for strong and severe thunderstorms this afternoon along the I-25 Corridor, with large hail, gusty winds, and a brief tornado possible.
- Severe storms will be possible again Tuesday afternoon, with locally heavy rain possible.
- Thunderstorm chances will continue on Wednesday with lower threat for severe storms, however, locally heavy rain will be possible.
- Trending warmer and drier by the end of the week.
Area forecast discussion, Jun 1, 2:05 PM MDT, 3 hours 23 minutes before
Area Forecast Discussion National Weather Service Denver/Boulder CO 205 PM MDT Mon Jun 1 2026 .KEY MESSAGES... - A chance for strong and severe thunderstorms this afternoon along the I-25 Corridor, with large hail, gusty winds, and a brief tornado possible. - Severe storms will be possible again Tuesday afternoon, with locally heavy rain possible. - Thunderstorm chances will continue on Wednesday with lower threat for severe storms, however, locally heavy rain will be possible. - Trending warmer and drier by the end of the week. && .DISCUSSION /Through Monday/... Issued at 158 PM MDT Mon Jun 1 2026 The synoptic pattern shows a broad upper-level low is in place over the Pacific Northwest, with a 80kt, southwest to northeast situated upper-level jet residing across the Central Rockies on this Monday morning. This is bringing southwesterly flow aloft across Colorado, with fairly robust low-level moisture (50F dewpoints) advecting into eastern Colorado via southeasterly upslope. Latest East Meso-2 Day Cloud Phase shows cumulus clouds along the Front Range Mountains are starting to show vertical growth early this afternoon. These storms are expected to become more robust within the next hour or two with potential for severe storms to develop along the I-25 Corridor between the 1-2PM time frame, where the SPC has the majority of our lower elevations in a Slight Risk (2/5 threat level). Latest ACARS sounding shows MLCAPE values around 1000 J/kg, with only a few degrees of surface heating needed to overcome a 700 mb inversion. Upslope flow to near 700 mb is also visible on KFTG VAD Wind Profiler, with surface dewpoints ranging from the upper-40s to mid-50s across the foothills and plains. Expecting storms to initially be discrete in nature with large hail (2-3") being the main threat, before progressing eastward where the environment will be more conducive to a more linear storm mode, with strong winds becoming the primary threat. While tornadoes are not expected to be the main threat today, a brief tornado cannot be ruled out where any low-level circulations can hold together. The severe threat is expected to diminish from west to east, moving out of metro Denver by 6PM and 8PM-9PM for the eastern plains. Hi-res guidance has continued to show shower and non-severe thunderstorms becoming reestablished behind the exiting severe threat, mainly along the South Platte River Valley, by 11PM-12AM continuing to around sunrise. For Tuesday, flow aloft will transition to a more zonal pattern with surface dewpoints expected to remain fairly robust once again. MLCAPE values are not expected to be as strong as today, but values between 500 to 1200 J/kg will be in place by the afternoon, with conditions favorable for another day of severe storm potential across the eastern plains. MUCAPE increasing to greater than 1500 J/kg mixed with steep mid-level lapse rates will support the development of baseline severe hail size potential, with shear weaker than today looking to keep the threat of anything larger than 2" limited and gusty outflows the most likely severe threat. Expecting storms to initiate between 1PM to 3PM and coverage to be far less than today, with the SPC having areas generally east of I- 25 in a Marginal risk (1/5 threat level). Afternoon thunderstorms will be possible once again Wednesday, with an isolated threat of some becoming severe, mainly for the eastern plains. Temperatures are forecast to gradually increase through the week, reaching for the 90s by Thursday as 700 mb flow warms by about 10C. Warmer and drier conditions are expected from Thursday onward, with increasing elevated fire weather conditions expected as the warmer and drier weather persists into the weekend, though with greenup well underway and multiple chances for precip through mid-week, any developing fire weather concerns will likely remain limited and localized. && .AVIATION /18Z TAFS through 18Z Tuesday/... Issued at 1158 AM MDT Mon Jun 1 2026 East to southeast winds have increased moisture across the area and brought stratocumulus clouds at 3,500 to 5,000 feet. These clouds will burn off soon as the airmass warms. This increase in moisture will fuel thunderstorm development this afternoon beginning around 19Z. Main time frame for a thunderstorm at DEN will be 20Z to 23Z. Hail (possibly large), heavy rain, and wind gusts to 50 knots will be possible under the stronger storms. Models agree there should only be one round of thunderstorms this afternoon, so by 22-00Z, expect storms to be east of DEN. Low clouds will develop after midnight between 08Z and 10Z and then linger most of Tuesday morning. Ceilings are expected to be in the 1000 to 3000 foot range, with a slight chance (20%) of ceilings under 1,000 feet. A Denver cyclone is expected to help form the low clouds. Then mid morning winds become southeast. This will end the threat of lower ceilings (~1000 feet) and slowly erode the remaining low clouds. Another round of afternoon thunderstorms is expected, beginning around 21Z. There's a chance the airmass is capped, with the best chance for this occurring north of Denver. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && DISCUSSION...9 AVIATION...12
In the hours before
Local storm report, Jun 1, 3:14 PM MDT, 2 hours 14 minutes before
Preliminary Local Storm Report
National Weather Service Denver CO
314 PM MDT Mon Jun 1 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0312 PM Hail 1 SE Bennett 39.74N 104.41W
06/01/2026 M1.75 Inch Arapahoe CO Public
Report from mPING: Golf Ball (1.75 in.).
&&Local storm report, Jun 1, 4:06 PM MDT, 1 hour 22 minutes before
Preliminary Local Storm Report
National Weather Service Denver CO
406 PM MDT Mon Jun 1 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0338 PM Hail 1 N Natural Fort 40.97N 104.92W
06/01/2026 E1.00 Inch Weld CO Public
&&Local storm report, Jun 1, 4:07 PM MDT, 1 hour 21 minutes before
Preliminary Local Storm Report
National Weather Service Denver CO
407 PM MDT Mon Jun 1 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0334 PM Hail 3 NW Strasburg 39.77N 104.32W
06/01/2026 M1.50 Inch Adams CO NWS Employee
0325 PM Hail 1 S Parker 39.49N 104.76W
06/01/2026 M0.88 Inch Douglas CO Trained Spotter
Funnel cloud, too.
&&Local storm report, Jun 1, 4:46 PM MDT, 42 minutes before
Preliminary Local Storm Report...Summary
National Weather Service Denver CO
446 PM MDT Mon Jun 1 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0439 PM Hail Simla 39.14N 104.08W
06/01/2026 M1.25 Inch Elbert CO Public
Report from mPING: Half Dollar (1.25 in.).
0421 PM Hail 6 E Woodrow 39.98N 103.46W
06/01/2026 M2.00 Inch Washington CO Public
Report from mPING: Hen Egg (2.00 in.).
0338 PM Hail 1 N Natural Fort 40.97N 104.92W
06/01/2026 E1.00 Inch Weld CO Public
0334 PM Hail 3 NW Strasburg 39.77N 104.32W
06/01/2026 M1.50 Inch Adams CO NWS Employee
0325 PM Hail 1 S Parker 39.49N 104.76W
06/01/2026 M0.88 Inch Douglas CO Trained Spotter
Funnel cloud, too.
0312 PM Hail 1 SE Bennett 39.74N 104.41W
06/01/2026 M1.75 Inch Arapahoe CO Public
Report from mPING: Golf Ball (1.75 in.).
0310 PM Hail 1 SSE Bennett 39.74N 104.41W
06/01/2026 E2.00 Inch Adams CO Trained Spotter
0308 PM Hail 1 SE Bennett 39.74N 104.41W
06/01/2026 M1.50 Inch Arapahoe CO Public
Report from mPING: Ping Pong Ball (1.50
in.).
0303 PM Hail 3 W Bennett 39.76N 104.48W
06/01/2026 M1.75 Inch Adams CO Broadcast Media
0302 PM Hail 1 SW Bennett 39.74N 104.44W
06/01/2026 M1.25 Inch Adams CO Public
Report from mPING: Half Dollar (1.25 in.).
0248 PM Hail 3 SE Manila Village 39.74N 104.47W
06/01/2026 M1.00 Inch Adams CO Public
Report from mPING: Quarter (1.00 in.).
0241 PM Hail 1 SE Watkins 39.74N 104.59W
06/01/2026 M1.00 Inch Adams CO Public
Report from mPING: Quarter (1.00 in.).
0234 PM Hail 4 E Buckley AFB 39.70N 104.67W
06/01/2026 M1.00 Inch Arapahoe CO Broadcast Media
0232 PM Hail 5 S Watkins 39.67N 104.60W
06/01/2026 M1.00 Inch Arapahoe CO Public
Report from mPING: Quarter (1.00 in.).
0205 PM Hail 3 N Aurora 39.75N 104.82W
06/01/2026 M1.25 Inch Adams CO Public
Report from mPING: Half Dollar (1.25 in.).
0140 PM Hail 3 W Aurora 39.72N 104.86W
06/01/2026 M1.00 Inch Arapahoe CO Public
Report from mPING: Quarter (1.00 in.).
0135 PM Funnel Cloud 1 W Kassler 39.49N 105.11W
06/01/2026 Jefferson CO Public
0135 PM Funnel Cloud 3 W Castle Pines 39.49N 104.93W
06/01/2026 Douglas CO Trained Spotter
The funnel dropped from the south west edge
of the storm. Was clean and wide for about 5
minutes, then became ropy before
disappearing.
0134 PM Funnel Cloud 1 S Chatfield Reservoir 39.54N 105.06W
06/01/2026 Douglas CO Public
0134 PM Hail 6 E Greenland 39.16N 104.75W
06/01/2026 M1.25 Inch Douglas CO Public
Report from mPING: Half Dollar (1.25 in.).
0133 PM Hail 2 NW Denver 39.76N 105.02W
06/01/2026 M1.00 Inch Denver CO Public
Report from mPING: Quarter (1.00 in.).
0131 PM Hail 2 SE Chatfield Reservoi 39.54N 105.03W
06/01/2026 E1.50 Inch Douglas CO Public
0130 PM Hail 4 E Denver 39.75N 104.91W
06/01/2026 M0.88 Inch Denver CO Trained Spotter
0128 PM Hail 2 E Denver 39.74N 104.95W
06/01/2026 E1.25 Inch Denver CO Trained Spotter
Report from mPING: Half Dollar (1.25 in.).
0123 PM Hail 3 E Denver 39.74N 104.92W
06/01/2026 M1.00 Inch Denver CO Public
Report from mPING: Quarter (1.00 in.).
0122 PM Hail 4 E Denver 39.75N 104.92W
06/01/2026 M1.75 Inch Denver CO Trained Spotter
0119 PM Hail 3 E Denver 39.74N 104.92W
06/01/2026 M1.00 Inch Denver CO Public
Report from mPING: Quarter (1.00 in.).
0115 PM Hail 1 SE Denver 39.73N 104.98W
06/01/2026 M1.00 Inch Denver CO Public
Most hail was smaller.
0114 PM Hail 1 SE Denver 39.73N 104.97W
06/01/2026 M1.50 Inch Denver CO Trained Spotter
0111 PM Hail 1 SE Denver 39.73N 104.98W
06/01/2026 E1.00 Inch Denver CO Public
Report from mPING: Quarter (1.00 in.).
0110 PM Hail 2 W Denver 39.74N 105.02W
06/01/2026 M1.00 Inch Denver CO Trained Spotter
0110 PM Hail 1 NW Denver 39.75N 105.00W
06/01/2026 E1.75 Inch Denver CO Public
0107 PM Hail Denver 39.74N 104.99W
06/01/2026 M1.00 Inch Denver CO NWS Employee
0105 PM Hail 1 E Edgewater 39.75N 105.04W
06/01/2026 M1.00 Inch Denver CO Trained Spotter
&&Local storm report, Jun 1, 4:59 PM MDT, 29 minutes before
Preliminary Local Storm Report
National Weather Service Denver CO
459 PM MDT Mon Jun 1 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0454 PM Hail 3 E Elizabeth 39.37N 104.55W
06/01/2026 E1.00 Inch Elbert CO Public
Report from mPING: Quarter (1.00 in.).
&&Local storm report, Jun 1, 5:11 PM MDT, 17 minutes before
Preliminary Local Storm Report
National Weather Service Denver CO
511 PM MDT Mon Jun 1 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0456 PM Hail 2 W Matheson 39.17N 104.01W
06/01/2026 M1.50 Inch Elbert CO Trained Spotter
&&The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 5:41 AM MDT | Special Weather Statement | BOU | Washington | 34 min |
| Jun 1, 6:38 AM MDT | Special Weather Statement | BOU | Washington | 37 min |
| Jun 1, 8:22 AM MDT | Special Weather Statement | BOU | Logan | 38 min |
| Jun 1, 8:58 AM MDT | Special Weather Statement | BOU | Logan | 47 min |
| Jun 1, 1:04 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 41 min |
| Jun 1, 1:28 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver, Douglas | 47 min |
| Jun 1, 1:31 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 44 min |
| Jun 1, 1:35 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Weld | 23 min |
| Jun 1, 1:38 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 52 min |
| Jun 1, 1:53 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe | 37 min |
| Jun 1, 2:04 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Denver | 3 hr |
| Jun 1, 2:14 PM MDT | Flash Flood Warning | BOU | Adams, Arapahoe, Denver | 95 min |
| Jun 1, 2:21 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 39 min |
| Jun 1, 2:29 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 46 min |
| Jun 1, 2:52 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 53 min |
| Jun 1, 3:02 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 43 min |
| Jun 1, 3:07 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 38 min |
| Jun 1, 3:13 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Washington | 47 min |
| Jun 1, 3:24 PM MDT | Tornado Warning | BOU | Adams, Washington | 39 min |
| Jun 1, 3:28 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 18 min |
| Jun 1, 3:33 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Douglas, Elbert | 25 min |
| Jun 1, 3:34 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 41 min |
| Jun 1, 3:40 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan, Washington | 50 min |
| Jun 1, 3:53 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan, Weld | 25 min |
| Jun 1, 4:24 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 41 min |
| Jun 1, 4:37 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 28 min |
| Jun 1, 4:38 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 52 min |
| Jun 1, 4:51 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 39 min |
| Jun 1, 5:00 PM MDT | Tornado Warning | BOU | Washington | 45 min |
| Jun 1, 5:04 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Washington | 41 min |
| Jun 1, 5:07 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 23 min |
| Jun 1, 5:26 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 34 min |
| Jun 1, 5:45 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 15 min |
| Jun 1, 5:53 PM MDT | Special Weather Statement | BOU | Logan, Phillips, Sedgwick | 67 min |
Nearby
Tornado Warnings in Colorado, 2026Every tornado warning in 2026Tornadoes in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.