Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 61, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 6, 2021, 4:08 PM MDT for Weld County, Colorado. It was in force for 37 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 6, 2021, 4:08 PM MDT (22:08 UTC)
- Expired
- Jun 6, 2021, 4:45 PM MDT
- In force
- 37 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 Denver radar (KFTG), 39 km from the middle of the area, began a volume at 22:11 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 12:00Z, 10.1 hours before the alert went out and 110 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
- 2939 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
696
WUUS55 KBOU 062208
SVRBOU
COC123-062245-
/O.NEW.KBOU.SV.W.0061.210606T2208Z-210606T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
408 PM MDT Sun Jun 6 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
South central Weld County in northeastern Colorado...
* Until 445 PM MDT.
* At 408 PM MDT, a severe thunderstorm was located 4 miles northeast
of Keenesburg, or 24 miles southeast of Greeley, moving southeast
at 5 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...
Keenesburg, Prospect Valley and Roggen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4002 10461 4016 10456 4029 10443 4030 10422
4002 10438
TIME...MOT...LOC 2208Z 314DEG 6KT 4015 10446
HAIL...1.00IN
WIND...60MPH
$$
DANIELSON1 follow-up statement
500
WWUS55 KBOU 062241
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
441 PM MDT Sun Jun 6 2021
COC123-062251-
/O.EXP.KBOU.SV.W.0061.000000T0000Z-210606T2245Z/
Weld CO-
441 PM MDT Sun Jun 6 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WELD COUNTY WILL
EXPIRE AT 445 PM MDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
LAT...LON 4002 10461 4016 10456 4029 10443 4030 10422
4002 10438
TIME...MOT...LOC 2241Z 314DEG 6KT 4011 10441
$$
DANIELSONThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 6:59 PM MDT | Special Weather Statement | BOU | Douglas | 46 min |
| Jun 5, 7:04 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 41 min |
| Jun 6, 12:30 PM MDT | Areal Flood Advisory | BOU | Larimer | 90 min |
| Jun 6, 4:02 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, 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.