Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 14, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 2, 2021, 1:17 PM MDT for 4 counties in Colorado. It was in force for 28 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
- May 2, 2021, 1:17 PM MDT (19:17 UTC)
- Expired
- May 2, 2021, 1:45 PM MDT
- In force
- 28 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Adams County, CO, Logan County, CO, Morgan County, CO, Washington County, CO
The radar
The Denver radar (KFTG), 105 km from the middle of the area, began a volume at 19:21 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 |
|---|---|---|---|
| May 2, 11:45 AM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 7.3 hours before the alert went out and 42 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
- 1976 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -89 m²/s²
- 0-3 km storm-relative helicity
- 10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
771
WUUS55 KBOU 021917
SVRBOU
COC001-075-087-121-021945-
/O.NEW.KBOU.SV.W.0014.210502T1917Z-210502T1945Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
117 PM MDT Sun May 2 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Eastern Morgan County in northeastern Colorado...
Western Washington County in northeastern Colorado...
Southwestern Logan County in northeastern Colorado...
Eastern Adams County in northeastern Colorado...
* Until 145 PM MDT.
* At 116 PM MDT, severe thunderstorms were located along a line
extending from 5 miles north of Antelope Springs to 7 miles north
of Cottonwood Valley, or along a line extending from 18 miles north
of Fort Morgan to 33 miles north of Limon, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
* Locations impacted include...
Fort Morgan, Brush, Merino, Hillrose, Gary, Prewitt Reservoir,
Shamrock, Antelope Springs, Twelve-Mile Corner, Adena School,
Woodlin School, Lindon, Snyder, Midway, Last Chance, Woodrow and
Atwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4053 10317 3972 10333 3975 10385 4052 10373
TIME...MOT...LOC 1916Z 270DEG 23KT 4051 10371 3974 10382
HAIL...1.00IN
WIND...60MPH
$$
MEIER1 follow-up statement
340
WWUS55 KBOU 021939
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
139 PM MDT Sun May 2 2021
COC001-075-087-121-021949-
/O.EXP.KBOU.SV.W.0014.000000T0000Z-210502T1945Z/
Morgan CO-Washington CO-Logan CO-Adams CO-
139 PM MDT Sun May 2 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MORGAN...WESTERN
WASHINGTON...SOUTHWESTERN LOGAN AND EASTERN ADAMS COUNTIES WILL
EXPIRE AT 145 PM MDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 700 PM MDT for
northeastern Colorado.
LAT...LON 4053 10317 3972 10333 3975 10385 4052 10373
TIME...MOT...LOC 1939Z 270DEG 23KT 4051 10354 3974 10365
$$
MEIERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 7:40 PM MDT | Special Weather Statement | BOU | Broomfield | 35 min |
| May 2, 3:42 AM MDT | Winter Storm Warning | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more | 34 hr |
| May 2, 10:36 AM MDT | Special Weather Statement | BOU | Boulder | 24 min |
| May 2, 11:01 AM MDT | Special Weather Statement | BOU | Broomfield | 29 min |
| May 2, 11:40 AM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 50 min |
| May 2, 2:13 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 32 min |
| May 2, 2:19 PM MDT | Winter Weather Advisory | BOU | Boulder, Clear Creek, Douglas, Gilpin, Grand, Jackson and 3 more | 23 hr |
| May 2, 4:07 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| May 2, 5:04 PM MDT | Special Weather Statement | BOU | Weld | 41 min |
| May 2, 5:47 PM MDT | Areal Flood Advisory | BOU | Boulder | 88 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.