Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 71, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 13, 2021, 7:26 PM MDT for Larimer County, Weld County, Colorado. It was in force for 34 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 13, 2021, 7:26 PM MDT (01:26 UTC)
- Expired
- Jun 13, 2021, 8:00 PM MDT
- In force
- 34 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 50.0 mph
Counties Larimer County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 69 km from the middle of the area, began a volume at 01:25 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 13, 7:27 PM MDT | HAIL 1.25 | 1 Nnw Milliken, CO | REPORT VIA TWITTER. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 1.4 hours before the alert went out and 150 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.
430 WUUS55 KBOU 140126 SVRBOU COC069-123-140200- /O.NEW.KBOU.SV.W.0071.210614T0126Z-210614T0200Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Denver CO 726 PM MDT Sun Jun 13 2021 The National Weather Service in Denver Colorado has issued a * Severe Thunderstorm Warning for... West central Weld County in northeastern Colorado... Eastern Larimer County in north central Colorado... * Until 800 PM MDT. * At 726 PM MDT, a severe thunderstorm was located over Milliken, or 8 miles southwest of Greeley, moving northwest at 5 mph. HAZARD...Half dollar size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Southwestern Greeley, Loveland, Windsor, Johnstown, Milliken, Berthoud, Mead and Gilcrest. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4028 10473 4026 10501 4046 10508 4051 10481 TIME...MOT...LOC 0126Z 144DEG 5KT 4034 10486 HAIL...1.25IN WIND...<50MPH $$ SCHLATTER
1 follow-up statement
854
WWUS55 KBOU 140150
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
750 PM MDT Sun Jun 13 2021
COC069-123-140200-
/O.EXP.KBOU.SV.W.0071.000000T0000Z-210614T0200Z/
Weld CO-Larimer CO-
750 PM MDT Sun Jun 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL WELD AND EASTERN
LARIMER COUNTIES WILL EXPIRE AT 800 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However small hail
is still possible with this thunderstorm.
LAT...LON 4028 10473 4026 10501 4046 10508 4051 10481
TIME...MOT...LOC 0150Z 144DEG 5KT 4037 10489
$$
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, 6:43 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 47 min |
| Jun 13, 6:58 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 32 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.