Alert archive / Colorado / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 20, NWS Grand Junction, CO
NWS Grand Junction, CO issued this severe thunderstorm warning at Aug 22, 2018, 6:49 PM MDT for Moffat County, Colorado. It was in force for 41 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
- Aug 22, 2018, 6:49 PM MDT (00:49 UTC)
- Expired
- Aug 22, 2018, 7:30 PM MDT
- In force
- 41 min
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Moffat County, CO
The radar
The Grand Junction radar (KGJX), 173 km from the middle of the area, began a volume at 00:51 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
Salt Lake City I, UT (KSLC), launched 00:00Z, 0.8 hours before the alert went out and 312 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
- 21 J/kg
- Mixed-layer CIN
- -276 J/kg
- Mixed-layer LCL
- 2003 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 131 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 Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 22, 4:30 PM MDT, 2 hours 19 minutes earlier.
Area forecast discussion, Aug 22, 4:30 PM MDT, 2 hours 19 minutes before
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</html>Hazardous weather outlook, Aug 22, 7:15 AM MDT, 11 hours 34 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 715 AM MDT Wed Aug 22 2018 COZ001>014-017>023-UTZ022>025-027>029-231315- Lower Yampa River Basin-Central Yampa River Basin- Roan and Tavaputs Plateaus-Elkhead and Park Mountains- Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor- Central Colorado River Basin-Grand and Battlement Mesas- Gore and Elk Mountains/Central Mountain Valleys- Central Gunnison and Uncompahgre River Basin- West Elk and Sawatch Mountains-Flat Tops- Upper Gunnison River Valley-Uncompahgre Plateau and Dallas Divide- Northwest San Juan Mountains-Southwest San Juan Mountains- Paradox Valley/Lower Dolores River- Four Corners/Upper Dolores River-Animas River Basin- San Juan River Basin-Southeast Utah-Eastern Uinta Mountains- Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat- La Sal and Abajo Mountains-Canyonlands/Natural Bridges- 715 AM MDT Wed Aug 22 2018 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Another round of showers and thunderstorms is on tap today with some heavier rainfall expected across the entire forecast area. A flash flood watch remains in effect for the burn scars across the area as even low amounts of rainfall can create flash flooding, mud slides, and debris flows. Strong storms are possible over northeast Utah and extreme northwest Colorado this afternoon and evening. There is a slight chance for hail up to 1 inch diameter and outflow winds to 60 MPH from one or two storm cells. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday An upper level trough will allow some showers and storms on Thursday though coverage should lower in the evening hours as it moves eastwards. Friday and Saturday looks relatively dry before another shot of monsoonal moisture moves in causing an increase in afternoon and evening convection. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected today or tonight, however spotters are encouraged to relay rainfall amounts or any observed flooding to the National Weather Service in Grand Junction.
In the hours before
Local storm report, Aug 22, 5:20 PM MDT, 1 hour 29 minutes before
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</html>Local storm report, Aug 22, 5:21 PM MDT, 1 hour 28 minutes before
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</html>Local storm report, Aug 22, 5:25 PM MDT, 1 hour 24 minutes before
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</html>Local storm report, Aug 22, 5:26 PM MDT, 1 hour 23 minutes before
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</html>Local storm report, Aug 22, 5:29 PM MDT, 1 hour 20 minutes before
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</html>Local storm report, Aug 22, 5:48 PM MDT, 1 hour 1 minute before
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</html>The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 7:30 PM MDT | Special Weather Statement | GJT | Moffat | 45 min |
| Aug 23, 4:11 AM MDT | Special Weather Statement | GJT | Mesa | 34 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2018Every severe thunderstorm warning in 2018
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.