Alert archive / Colorado / Winter Storm Watches in 2021
Winter Storm Watch 7, NWS Grand Junction, CO
NWS Grand Junction, CO issued this winter storm watch at Dec 25, 2021, 2:59 AM MST for 18 counties in Colorado; Daggett County, Uintah County, Utah. It took effect at Dec 25, 2021, 11:00 PM MST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 25, 2021, 2:59 AM MST (09:59 UTC)
- In effect from
- Dec 25, 2021, 11:00 PM MST
- Expired
- Dec 25, 2021, 2:59 PM MST
- In force
- Issued by
- NWS Grand Junction, CO
Counties Archuleta County, CO, Delta County, CO, Dolores County, CO, Eagle County, CO, Garfield County, CO, Gunnison County, CO, Hinsdale County, CO, La Plata County, CO, Mesa County, CO, Moffat County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Pitkin County, CO, Rio Blanco County, CO, Routt County, CO, San Juan County, CO, San Miguel County, CO, Daggett County, UT, Uintah County, UT
The radar
The Grand Junction radar (KGJX), 34 km from the middle of the area, began a volume at 10:02 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
Denver, CO (KDNR), launched 00:00Z, 10.0 hours before the alert went out and 421 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1425 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- -42 m²/s²
- 0-3 km storm-relative helicity
- 4 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 watch 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 watch went out at Dec 24, 11:05 PM MST, 3 hours 54 minutes earlier.
Area forecast discussion, Dec 24, 11:05 PM MST, 3 hours 54 minutes before
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</html>Hazardous weather outlook, Dec 24, 5:16 AM MST, 21 hours 43 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 516 AM MST Fri Dec 24 2021 COZ001>014-017>023-UTZ022>025-027>029-251230- 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- 516 AM MST Fri Dec 24 2021 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Snow, heavy at times will continue across the mountains and northwest Colorado today and tonight. Snow combined with blowing snow will make holiday travel difficult to hazardous over the mountain passes during the next 24 hours. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Mountain snow showers will continue on and off during the latter part of the weekend. Additional rounds of snow are likely early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected today or tonight, however spotters are encouraged to report snowfall amounts to the National Weather Service in Grand Junction.
In the hours before
Local storm report, Dec 24, 10:31 PM MST, 4 hours 28 minutes 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 |
|---|---|---|---|---|
| Dec 24, 10:51 PM MST | Dense Fog Advisory | GJT | Delta, Garfield, Gunnison, Mesa, Montrose | 14 hr |
| Dec 25, 2:59 PM MST | Winter Storm Warning | GJT | Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 11 more | 4 days |
| Dec 25, 2:59 PM MST | Winter Weather Advisory | GJT | Delta, Eagle, Garfield, Gunnison, Hinsdale, Mesa and 7 more | 4 days |
| Dec 25, 3:02 PM MST | Wind Advisory | GJT | Delta, Dolores, Garfield, Gunnison, Mesa, Moffat and 3 more | 25 hr |
Nearby
Winter Storm Watches in Colorado, 2021Winter Storm Watches in Utah, 2021Every winter storm watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.