Alert archive / Colorado / Winter Storm Warnings in 2011

Winter Storm Warning 14, NWS Grand Junction, CO

April 8, 201117 counties in Colorado; Daggett County, Uintah County, Utah

NWS Grand Junction, CO issued this winter storm warning at Apr 8, 2011, 10:01 AM MDT for 17 counties in Colorado; Daggett County, Uintah County, Utah. It was in force for 62 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 8, 2011, 10:01 AM MDT (16:01 UTC)
Expired: Apr 11, 2011, 12:00 AM MDT
In force: 62 hr
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, 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), 33 km from the middle of the area, began a volume at 16:00 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, 4.0 hours before the alert went out and 426 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: 1780 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 188 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 8, 4:25 AM MDT, 5 hours 36 minutes earlier.

Area forecast discussion, Apr 8, 4:25 AM MDT, 5 hours 36 minutes before

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Hazardous weather outlook, Apr 8, 6:00 AM MDT, 4 hours 1 minute before

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In the hours before

Special weather statement, Apr 8, 4:51 AM MDT, 5 hours 10 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 8, 4:40 AM MDT	Winter Storm Watch	GJT	Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more	22 hr
Apr 8, 10:01 AM MDT	Winter Weather Advisory	GJT	Delta, Eagle, Garfield, Mesa, Moffat, Montrose and 5 more	62 hr
Apr 8, 3:30 AM MDT	Wind Advisory	GJT	Grand, San Juan	15 hr

Nearby

Winter Storm Warnings in Colorado, 2011 Winter Storm Warnings in Utah, 2011 Every winter storm warning in 2011

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.