Alert archive / Colorado / Winter Storm Warnings in 2020
Winter Storm Warning 13, NWS Grand Junction, CO
NWS Grand Junction, CO issued this winter storm warning at Dec 27, 2020, 2:41 PM MST for 7 counties in Colorado. It was in force for 48 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
- Dec 27, 2020, 2:41 PM MST (21:41 UTC)
- Expired
- Dec 29, 2020, 2:27 PM MST
- In force
- 48 hr
- Issued by
- NWS Grand Junction, CO
Counties Archuleta County, CO, Dolores County, CO, Hinsdale County, CO, La Plata County, CO, Montezuma County, CO, San Juan County, CO, San Miguel County, CO
The radar
The Grand Junction radar (KGJX), 165 km from the middle of the area, began a volume at 21:40 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 12:00Z, 9.7 hours before the alert went out and 178 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
- 1844 m above ground
- 0-6 km bulk shear
- 116 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 27 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 Dec 27, 10:32 AM MST, 4 hours 9 minutes earlier.
Area forecast discussion, Dec 27, 10:32 AM MST, 4 hours 9 minutes before
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</html>Hazardous weather outlook, Dec 27, 4:33 AM MST, 10 hours 8 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 433 AM MST Sun Dec 27 2020 COZ001>014-017>023-UTZ022>025-027>029-281145- 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- 433 AM MST Sun Dec 27 2020 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Light snow will linger across the northern Colorado mountains in the morning while increasing across the southern mountains during the late afternoon hours. Accumulations will be light but impacts over mountain passes can be expected. Snowfall becomes more widespread and heavy a times in the southern Colorado mountains overnight. .DAYS TWO THROUGH SEVEN...Monday through Saturday A stronger storm will impact the region Monday through late Tuesday. Monday afternoon through early Tuesday will be the timeframe of most concern with widespread areas of moderate to heavy snowfall rates possible. Impacts to travel will be likely during this timeframe. Snowfall could impact the some portion of eastern Utah and western Colorado again by the end of the week. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today.
In the hours before
Local storm report, Dec 27, 8:47 AM MST, 5 hours 54 minutes before
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</html>Local storm report, Dec 27, 10:48 AM MST, 3 hours 53 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1048 AM MST SUN DEC 27 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0945 AM SNOW OAK CREEK 40.27N 106.96W
12/27/2020 M1.5 INCH ROUTT CO COCORAHS
COCORAHS STATION CO-RT-64 OAK CREEK 0.4 W.
0700 AM SNOW 1 S MOUNT CRESTED BUTTE 38.89N 106.97W
12/27/2020 M1.0 INCH GUNNISON CO COCORAHS
COCORAHS STATION CO-GN-66 MOUNT CRESTED
BUTTE.
0700 AM SNOW 5 W TOPONAS 40.08N 106.89W
12/27/2020 M1.2 INCH ROUTT CO COCORAHS
COCORAHS STATION CO-RT-26 YAMPA 5.1S.
0700 AM SNOW 1 NNW STEAMBOAT SPRINGS 40.49N 106.82W
12/27/2020 M1.7 INCH ROUTT CO COCORAHS
COCORAHS STATION CO-RT-28 STEAMBOAT SPRINGS
0.6NNW.
&&Local storm report, Dec 27, 1:28 PM MST, 1 hour 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
128 PM MST SUN DEC 27 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 AM SNOW 4 ESE STEAMBOAT SPRINGS 40.45N 106.75W
12/27/2020 M3.0 INCH ROUTT CO PUBLIC
&&
MMSThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 27, 3:24 AM MST | Winter Storm Watch | GJT | Archuleta, Dolores, Hinsdale, La Plata, Montezuma, San Juan and 1 more | 11 hr |
| Dec 27, 2:41 PM MST | Winter Weather Advisory | GJT | Archuleta, Delta, Eagle, Garfield, Gunnison, Hinsdale and 9 more | 48 hr |
Nearby
Winter Storm Warnings in Colorado, 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.