Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 20, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 14, 2021, 6:49 PM MDT for Weld County, Colorado. It was in force for 41 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 14, 2021, 6:49 PM MDT (00:49 UTC)
- Expired
- May 14, 2021, 7:30 PM MDT
- In force
- 41 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 42 km from the middle of the area, began a volume at 00:50 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, 0.8 hours before the alert went out and 153 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
- 137 J/kg
- Mixed-layer CIN
- -133 J/kg
- Mixed-layer LCL
- 1940 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
835
WUUS55 KBOU 150049
SVRBOU
COC123-150130-
/O.NEW.KBOU.SV.W.0020.210515T0049Z-210515T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
649 PM MDT Fri May 14 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Northwestern Weld County in northeastern Colorado...
* Until 730 PM MDT.
* At 648 PM MDT, a severe thunderstorm was located 7 miles northeast
of Rockport, or 15 miles southeast of Cheyenne, moving southeast 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...
Grover and Rockport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4085 10408 4073 10479 4100 10481 4100 10448
TIME...MOT...LOC 0048Z 302DEG 23KT 4095 10467
HAIL...1.00IN
WIND...60MPH
$$
DIRENZO1 follow-up statement
632
WWUS55 KBOU 150108
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
708 PM MDT Fri May 14 2021
COC123-150130-
/O.CON.KBOU.SV.W.0020.000000T0000Z-210515T0130Z/
Weld CO-
708 PM MDT Fri May 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MDT
FOR NORTH CENTRAL WELD COUNTY...
At 708 PM MDT, a severe thunderstorm was located 13 miles southwest
of Hereford, or 23 miles southeast of Cheyenne, moving southeast at
25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
Locations impacted include...
Grover.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4075 10467 4098 10468 4100 10448 4085 10408
TIME...MOT...LOC 0108Z 302DEG 23KT 4088 10452
HAIL...1.00IN
WIND...60MPH
$$
DIRENZOThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 6:52 PM MDT | Special Weather Statement | BOU | Morgan | 38 min |
| May 14, 7:17 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 28 min |
| May 14, 7:36 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 39 min |
| May 14, 7:40 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 50 min |
| May 14, 8:14 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 46 min |
| May 14, 8:52 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 38 min |
| May 14, 9:29 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan, Washington | 46 min |
| May 15, 2:21 PM MDT | Special Weather Statement | BOU | Larimer | 24 min |
| May 15, 2:50 PM MDT | Special Weather Statement | BOU | Denver | 25 min |
| May 15, 5:29 PM MDT | Special Weather Statement | BOU | Douglas | 31 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.