Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 69, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 13, 2021, 6:43 PM MDT for Weld County, Colorado. It was in force for 47 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 13, 2021, 6:43 PM MDT (00:43 UTC)
- Expired
- Jun 13, 2021, 7:30 PM MDT
- In force
- 47 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 57 km from the middle of the area, began a volume at 00:43 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 nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 0.7 hours before the alert went out and 139 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
- 1095 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 2628 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
306
WUUS55 KBOU 140043
SVRBOU
COC123-140130-
/O.NEW.KBOU.SV.W.0069.210614T0043Z-210614T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
643 PM MDT Sun Jun 13 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
North central Weld County in northeastern Colorado...
* Until 730 PM MDT.
* At 643 PM MDT, a severe thunderstorm was located 13 miles west of
Grover, or 28 miles southeast of Cheyenne, moving east at 10 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect
damage to roofs, siding, windows, and vehicles.
* Locations impacted include...
Grover.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4062 10427 4074 10462 4089 10458 4087 10423
TIME...MOT...LOC 0043Z 287DEG 8KT 4082 10448
HAIL...1.50IN
WIND...<50MPH
$$
SCHLATTER2 follow-up statements
347 WWUS55 KBOU 140108 SVSBOU Severe Weather Statement National Weather Service Denver CO 708 PM MDT Sun Jun 13 2021 COC123-140130- /O.CON.KBOU.SV.W.0069.000000T0000Z-210614T0130Z/ Weld CO- 708 PM MDT Sun Jun 13 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MDT FOR NORTH CENTRAL WELD COUNTY... At 708 PM MDT, a severe thunderstorm was located 9 miles north of Briggsdale, or 31 miles northeast of Greeley, moving southeast at 20 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. Locations impacted include... Grover. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4069 10449 4088 10439 4087 10423 4062 10427 TIME...MOT...LOC 0108Z 298DEG 15KT 4076 10436 HAIL...1.00IN WIND...<50MPH $$ SCHLATTER
916
WWUS55 KBOU 140127
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
727 PM MDT Sun Jun 13 2021
COC123-140137-
/O.EXP.KBOU.SV.W.0069.000000T0000Z-210614T0130Z/
Weld CO-
727 PM MDT Sun Jun 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WELD COUNTY WILL
EXPIRE AT 730 PM MDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
LAT...LON 4069 10449 4088 10439 4087 10423 4062 10427
TIME...MOT...LOC 0127Z 287DEG 8KT 4075 10431
$$
SCHLATTERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 13, 6:17 PM MDT | Special Weather Statement | BOU | Broomfield | 28 min |
| Jun 13, 6:26 PM MDT | Special Weather Statement | BOU | Denver | 34 min |
| Jun 13, 6:31 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 29 min |
| Jun 13, 6:58 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 32 min |
| Jun 13, 7:26 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 34 min |
| Jun 13, 7:32 PM MDT | Special Weather Statement | BOU | Logan | 43 min |
| Jun 13, 8:29 PM MDT | Special Weather Statement | BOU | Morgan | 46 min |
| Jun 13, 8:31 PM MDT | Special Weather Statement | BOU | Larimer | 29 min |
| Jun 13, 9:32 PM MDT | Special Weather Statement | BOU | Weld | 28 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.