Alert archive / Colorado / Winter Storm Warnings in 2020

Winter Storm Warning 8, NWS Grand Junction, CO

April 14, 20208 counties in Colorado

NWS Grand Junction, CO issued this winter storm warning at Apr 14, 2020, 2:43 PM MDT for 8 counties in Colorado. It took effect at Apr 15, 2020, 6:00 AM MDT. It was in force for 42 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: Apr 14, 2020, 2:43 PM MDT (20:43 UTC)
In effect from: Apr 15, 2020, 6:00 AM MDT
Expired: Apr 17, 2020, 12:00 AM MDT
In force: 42 hr
Issued by: NWS Grand Junction, CO

Counties Delta County, CO, Eagle County, CO, Garfield County, CO, Gunnison County, CO, Moffat County, CO, Montrose County, CO, Pitkin County, CO, Routt County, CO

The radar

The Grand Junction radar (KGJX), 75 km from the middle of the area, began a volume at 20:43 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 12:00Z, 8.7 hours before the alert went out and 367 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1400 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Apr 14, 11:38 AM MDT, 3 hours 5 minutes earlier.

Area forecast discussion, Apr 14, 11:38 AM MDT, 3 hours 5 minutes before

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Hazardous weather outlook, Apr 14, 4:38 AM MDT, 10 hours 5 minutes before

Hazardous Weather Outlook
National Weather Service Grand Junction CO
438 AM MDT Tue Apr 14 2020

COZ001>014-017>023-UTZ022>025-027>029-151045-
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-
438 AM MDT Tue Apr 14 2020

This hazardous weather outlook is for eastern Utah and western
Colorado.

.DAY ONE...Today and Tonight

Below freezing temperatures will once again be a threat to the
lower Gunnison and Colorado Basins in western Colorado and eastern
Utah where additional freeze watches and warnings are in effect
for Wednesday morning. Light snow will develop over the northern
Colorado mountains late today increasing in coverage in the
north overnight. Accumulations will be light though travel could
be impacted along Highway 40 over Rabbit Ears Pass.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Snow will become more widespread Thursday into the late week
period as another cold system impacts the region. Snow will be
favored over the mountains but will fall in lower elevations at
times. Impacts to mountain travel is possible through late week
before a warm up begins for the weekend. Freezing temperatures
cold return the lower valleys once again later this week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

In the hours before

Local storm report, Apr 14, 8:48 AM MDT, 5 hours 55 minutes before

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Local storm report, Apr 14, 8:49 AM MDT, 5 hours 54 minutes before

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The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 14, 4:32 AM MDT	Freeze Watch	GJT	Garfield, Mesa	9 hr
Apr 14, 4:32 AM MDT	Freeze Warning	GJT	Delta, Garfield, Gunnison, Mesa, Montrose	29 hr
Apr 14, 2:43 PM MDT	Winter Storm Watch	GJT	Delta, Eagle, Garfield, Gunnison, Montrose, Pitkin	12 hr
Apr 14, 2:43 PM MDT	Winter Weather Advisory	GJT	Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more	57 hr

Nearby

Winter Storm Warnings in Colorado, 2020 Every 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.