Alert archive / Colorado / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 81, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 10, 2023, 4:00 PM MDT for Weld County, Colorado. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 10, 2023, 4:00 PM MDT (22:00 UTC)
- Expired
- Jun 10, 2023, 4:30 PM MDT
- In force
- 30 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 Cheyenne radar (KCYS), 75 km from the middle of the area, began a volume at 22:02 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.0 hours before the alert went out and 325 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
- 19 J/kg
- Mixed-layer CIN
- -216 J/kg
- Mixed-layer LCL
- 1408 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -48 m²/s²
- 0-3 km storm-relative helicity
- -48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 10, 3:32 PM MDT, 28 minutes earlier.
Area forecast discussion, Jun 10, 3:32 PM MDT, 28 minutes before
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Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1115 AM MDT Sat Jun 10 2023 COZ030>051-111715- Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Grand and Summit Counties Below 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Central and Southeast Park County- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 1115 AM MDT Sat Jun 10 2023 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Scattered showers and thunderstorms will develop across the higher terrain and shift into the plains during the afternoon and evening. Expect a few strong to marginally severe storms across the plains with damaging winds and hail. The strongest storms will mainly remain east of the urban corridor. The majority of the storms today will produce brief heavy rain, small hail and wind gusts up to 40 mph. The flash flood potential in the mountains will remain limited today with marginal moisture and instability. Cameron Peak burn area may be a bit more prone to flooding due to stronger storms in that area but decent storm motions should keep flash flood potential still on the low side. .DAYS TWO THROUGH SEVEN...Sunday through Friday Showers and thunderstorms are likely over the mountains, foothills and adjacent plains on Sunday evening. Heavy rains could cause flash flooding and there will be an elevated threat of flash flooding in the alpine burned areas. Both Monday and Tuesday afternoons and evenings can expected likely showers and thunderstorms with a flash flooding threat, especially in the burned areas. On Wednesday through Friday, scattered late day showers and thunderstorms are expected. There will be more afternoon heating so a few of the storms could be severe with large hail and damaging winds. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed across the northeast plains this afternoon, mainly sections east of the Interstate 25 corridor. Reports of hail and damaging winds will be appreciated.
In the hours before
Special weather statement, Jun 10, 1:33 PM MDT, 2 hours 27 minutes before
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</html>The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 10, 11:49 AM MDT | Flash Flood Warning | BOU | Larimer | 114 min |
| Jun 10, 1:33 PM MDT | Special Weather Statement | BOU | Weld | 27 min |
| Jun 10, 4:19 PM MDT | Special Weather Statement | BOU | Douglas | 41 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2023Every severe thunderstorm warning in 2023
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.