Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 8, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 27, 2021, 3:13 PM MDT for Adams County, Morgan County, 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
- Apr 27, 2021, 3:13 PM MDT (21:13 UTC)
- Expired
- Apr 27, 2021, 3:45 PM MDT
- In force
- 32 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Adams County, CO, Morgan County, CO, Washington County, CO
The radar
The Denver radar (KFTG), 78 km from the middle of the area, began a volume at 21:13 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 27, 11:45 AM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.2 hours before the alert went out and 39 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3214 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
398
WUUS55 KBOU 272113
SVRBOU
COC001-087-121-272145-
/O.NEW.KBOU.SV.W.0008.210427T2113Z-210427T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
313 PM MDT Tue Apr 27 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Southeastern Morgan County in northeastern Colorado...
West central Washington County in northeastern Colorado...
Northeastern Adams County in northeastern Colorado...
* Until 345 PM MDT.
* At 312 PM MDT, a severe thunderstorm was located 5 miles west of
Woodrow, or 20 miles south of Fort Morgan, moving northeast at 10
mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected. Hail may accumulate on
roadways causing hazardous travel.
* Locations impacted include...
Twelve-Mile Corner, Gary and Woodrow.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
&&
LAT...LON 3986 10380 4005 10390 4018 10359 4003 10344
3986 10349
TIME...MOT...LOC 2112Z 235DEG 7KT 3998 10369
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...<50MPH
$$
DANIELSONThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 1:52 AM MDT | Severe Thunderstorm Warning | BOU | Washington | 23 min |
| Apr 27, 3:16 AM MDT | Winter Storm Warning | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more | 30 hr |
| Apr 27, 11:35 AM MDT | Special Weather Statement | BOU | Douglas | 25 min |
| Apr 27, 11:55 AM MDT | Special Weather Statement | BOU | Elbert | 50 min |
| Apr 27, 11:59 AM MDT | Special Weather Statement | BOU | Denver | 31 min |
| Apr 27, 12:49 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 26 min |
| Apr 27, 1:15 PM MDT | Special Weather Statement | BOU | Adams | 45 min |
| Apr 27, 1:51 PM MDT | Special Weather Statement | BOU | Lincoln | 39 min |
| Apr 27, 1:53 PM MDT | Special Weather Statement | BOU | Weld | 37 min |
| Apr 27, 1:59 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 31 min |
| Apr 27, 2:02 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 28 min |
| Apr 27, 2:08 PM MDT | Winter Weather Advisory | BOU | Clear Creek, Douglas, Gilpin, Jefferson, Park | 20 hr |
| Apr 27, 2:23 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 52 min |
| Apr 27, 2:43 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan | 32 min |
| Apr 27, 2:49 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 41 min |
| Apr 27, 3:00 PM MDT | Special Weather Statement | BOU | Lincoln | 45 min |
| Apr 27, 3:10 PM MDT | Special Weather Statement | BOU | Morgan | 20 min |
| Apr 27, 3:28 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 47 min |
| Apr 27, 3:32 PM MDT | Special Weather Statement | BOU | Morgan | 28 min |
| Apr 27, 3:41 PM MDT | Tornado Warning | BOU | Lincoln | 34 min |
| Apr 27, 4:12 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 33 min |
| Apr 27, 4:16 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Morgan, Washington | 17 min |
| Apr 27, 4:36 PM MDT | Tornado Warning | BOU | Lincoln | 24 min |
| Apr 27, 5:19 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 26 min |
| Apr 27, 5:51 PM MDT | Special Weather Statement | BOU | Phillips | 24 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.