Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 70, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 13, 2021, 6:58 PM MDT for Weld County, Colorado. It was in force for 32 min. 5 reports 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, 6:58 PM MDT (00:58 UTC)
- Expired
- Jun 13, 2021, 7:30 PM MDT
- In force
- 32 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 Denver radar (KFTG), 61 km from the middle of the area, began a volume at 00:59 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, 7:10 PM MDT | HAIL 1 | La Salle, CO | |
| Jun 13, 7:15 PM MDT | HAIL 1.5 | 1 Nnw Milliken, CO | |
| Jun 13, 7:17 PM MDT | HAIL 1.25 | 1 Sw Evans, CO | |
| Jun 13, 7:22 PM MDT | HAIL 1.25 | Milliken, CO | ESTIMATED BETWEEN QUARTER AND GOLF BALL SIZED HAIL FALLING AT THE TIME OF REPORT. |
| 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, 1.0 hours before the alert went out and 138 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.
202 WUUS55 KBOU 140058 SVRBOU COC123-140130- /O.NEW.KBOU.SV.W.0070.210614T0058Z-210614T0130Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Denver CO 658 PM MDT Sun Jun 13 2021 The National Weather Service in Denver Colorado has issued a * Severe Thunderstorm Warning for... Southwestern Weld County in northeastern Colorado... * Until 730 PM MDT. * At 658 PM MDT, a severe thunderstorm was located near LaSalle, or 7 miles south of Greeley, moving north at 10 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Greeley, Evans, Johnstown, Milliken, LaSalle, Kersey, Gilcrest and Milton Reservoir. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4026 10492 4044 10488 4040 10447 4020 10453 TIME...MOT...LOC 0058Z 198DEG 7KT 4031 10474 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 |
|---|---|---|---|---|
| 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, 7:26 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 34 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.