Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 67, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 13, 2021, 5:54 PM MDT for Weld County, Colorado. It was in force for 51 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, 5:54 PM MDT (23:54 UTC)
- Expired
- Jun 13, 2021, 6:45 PM MDT
- In force
- 51 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 47 km from the middle of the area, began a volume at 23:54 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, 11.9 hours before the alert went out and 149 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
- 827 J/kg
- Mixed-layer CIN
- -387 J/kg
- Mixed-layer LCL
- 1858 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
313 WUUS55 KBOU 132354 SVRBOU COC123-140045- /O.NEW.KBOU.SV.W.0067.210613T2354Z-210614T0045Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Denver CO 554 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 645 PM MDT. * At 554 PM MDT, a severe thunderstorm was located 11 miles west of Hereford, or 21 miles southeast of Cheyenne, moving east at 10 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Hereford. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4077 10428 4077 10462 4100 10461 4100 10423 TIME...MOT...LOC 2354Z 270DEG 7KT 4092 10451 HAIL...1.00IN WIND...<50MPH $$ SCHLATTER
2 follow-up statements
267
WWUS55 KBOU 140004
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
604 PM MDT Sun Jun 13 2021
COC123-140045-
/O.CON.KBOU.SV.W.0067.000000T0000Z-210614T0045Z/
Weld CO-
604 PM MDT Sun Jun 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM MDT
FOR NORTH CENTRAL WELD COUNTY...
At 604 PM MDT, a severe thunderstorm was located 10 miles west of
Hereford, or 21 miles southeast of Cheyenne, moving east at 5 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect damage
to roofs, siding, windows, and vehicles.
Locations impacted include...
Hereford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4077 10428 4077 10462 4100 10461 4100 10423
TIME...MOT...LOC 0004Z 272DEG 6KT 4092 10450
HAIL...1.50IN
WIND...<50MPH
$$
SCHLATTER147
WWUS55 KBOU 140027
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
627 PM MDT Sun Jun 13 2021
COC123-140045-
/O.CON.KBOU.SV.W.0067.000000T0000Z-210614T0045Z/
Weld CO-
627 PM MDT Sun Jun 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM MDT
FOR NORTH CENTRAL WELD COUNTY...
At 627 PM MDT, a severe thunderstorm was located 13 miles southwest
of Hereford, or 24 miles southeast of Cheyenne, moving southeast at 5
mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. People and
animals outdoors will be injured. Expect hail damage to
roofs, siding, windows, and vehicles.
Locations impacted include...
Hereford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4077 10428 4077 10462 4100 10461 4100 10423
TIME...MOT...LOC 0027Z 326DEG 4KT 4086 10453
HAIL...1.75IN
WIND...60MPH
$$
SCHLATTERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 13, 4:02 PM MDT | Special Weather Statement | BOU | Douglas | 43 min |
| Jun 13, 4:27 PM MDT | Special Weather Statement | BOU | Denver | 33 min |
| Jun 13, 4:38 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver | 37 min |
| Jun 13, 4:59 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 31 min |
| Jun 13, 5:14 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver | 31 min |
| Jun 13, 5:45 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver, 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.