Alert archive / Colorado / Winter Storm Warnings in 2020
Winter Storm Warning 9, NWS Grand Junction, CO
NWS Grand Junction, CO issued this winter storm warning at Sep 7, 2020, 3:36 AM MDT for 14 counties in Colorado; Daggett County, Uintah County, Utah. It took effect at Sep 8, 2020, 12:00 AM MDT. It was in force for 60 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 7, 2020, 3:36 AM MDT (09:36 UTC)
- In effect from
- Sep 8, 2020, 12:00 AM MDT
- Expired
- Sep 10, 2020, 12:00 PM MDT
- In force
- 60 hr
- Issued by
- NWS Grand Junction, CO
Counties Archuleta County, CO, Delta County, CO, Dolores County, CO, Garfield County, CO, Gunnison County, CO, Hinsdale County, CO, La Plata County, CO, Moffat County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Rio Blanco County, CO, San Juan County, CO, San Miguel County, CO, Daggett County, UT, Uintah County, UT
The radar
The Grand Junction radar (KGJX), 46 km from the middle of the area, began a volume at 09:41 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
Grand Junction, CO (KGJT), launched 00:00Z, 9.6 hours before the alert went out and 63 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
- 6 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 4514 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm 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 winter storm warning went out at Sep 6, 11:22 PM MDT, 4 hours 14 minutes earlier.
Area forecast discussion, Sep 6, 11:22 PM MDT, 4 hours 14 minutes before
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</html>Hazardous weather outlook, Sep 6, 5:26 AM MDT, 22 hours 10 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 526 AM MDT Sun Sep 6 2020 COZ001>014-017>023-UTZ022>025-027>029-071130- 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- 526 AM MDT Sun Sep 6 2020 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Critical fire weather conditions are expected today over northern portions of the forecast area. .DAYS TWO THROUGH SEVEN...Monday through Saturday Critical fire weather conditions continue on Monday with gusty winds ahead of a strong cold front. Freezing temperatures will likely affect an area from roughly Dinosaur to Craig to Steamboat and points north on Tuesday morning. Higher elevation snow is likely on Tuesday as high temperatures drop 20 to 30 degrees from the previous several days. Low temperatures Wednesday morning may drop to the mid 20s for the northern valleys...with freezing temperatures possible as far south as Cortez and Durango. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 9:38 PM MDT | Winter Storm Watch | GJT | Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 8 more | 6 hr |
| Sep 7, 3:36 AM MDT | Winter Weather Advisory | GJT | Delta, Eagle, Garfield, Gunnison, Mesa, Moffat and 4 more | 50 hr |
| Sep 7, 4:01 AM MDT | Freeze Watch | GJT | Eagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt | 24 hr |
| Sep 7, 4:01 AM MDT | Freeze Warning | GJT | Routt | 30 hr |
| Sep 7, 4:12 PM MDT | Wind Advisory | GJT | Routt | 29 hr |
| Sep 7, 4:12 PM MDT | High Wind Warning | GJT | Uintah | 29 hr |
Nearby
Winter Storm Warnings in Colorado, 2020Winter Storm Warnings in Utah, 2020Every winter storm warning in 2020
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.