Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 54, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 29, 2021, 2:29 PM MDT for Weld County, Colorado. It was in force for 31 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 29, 2021, 2:29 PM MDT (20:29 UTC)
- Expired
- May 29, 2021, 3:00 PM MDT
- In force
- 31 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 50.0 mph
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 26 km from the middle of the area, began a volume at 20:33 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, 8.5 hours before the alert went out and 173 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
- 2325 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -78 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
076 WUUS55 KBOU 292029 SVRBOU COC123-292100- /O.NEW.KBOU.SV.W.0054.210529T2029Z-210529T2100Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Denver CO 229 PM MDT Sat May 29 2021 The National Weather Service in Denver Colorado has issued a * Severe Thunderstorm Warning for... Northwestern Weld County in northeastern Colorado... * Until 300 PM MDT. * At 229 PM MDT, a severe thunderstorm was located 5 miles northeast of Natural Fort, or 9 miles southwest of Cheyenne, moving east- southeast at 20 mph. HAZARD...Half dollar size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Rockport and Natural Fort. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4084 10462 4092 10493 4100 10494 4100 10456 TIME...MOT...LOC 2029Z 290DEG 18KT 4102 10487 HAIL...1.25IN WIND...<50MPH $$ SCHLATTER
1 follow-up statement
401 WWUS55 KBOU 292042 SVSBOU Severe Weather Statement National Weather Service Denver CO 242 PM MDT Sat May 29 2021 COC123-292100- /O.CON.KBOU.SV.W.0054.000000T0000Z-210529T2100Z/ Weld CO- 242 PM MDT Sat May 29 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR NORTHERN WELD COUNTY... At 242 PM MDT, a severe thunderstorm was located 5 miles northeast of Natural Fort, or 10 miles south of Cheyenne, moving southeast at 20 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. Locations impacted include... Rockport. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4099 10457 4084 10462 4092 10490 4099 10491 TIME...MOT...LOC 2042Z 295DEG 16KT 4099 10482 HAIL...1.00IN WIND...<50MPH $$ SCHLATTER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 6:20 AM MDT | Dense Fog Advisory | BOU | Elbert, Lincoln, Washington, Weld | 100 min |
| May 29, 1:34 PM MDT | Special Weather Statement | BOU | Boulder | 26 min |
| May 29, 1:55 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 35 min |
| May 29, 2:07 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 23 min |
| May 29, 2:59 PM MDT | Special Weather Statement | BOU | Weld | 31 min |
| May 29, 3:39 PM MDT | Areal Flood Advisory | BOU | Larimer | 83 min |
| May 29, 4:58 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 32 min |
| May 29, 5:16 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 29 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.