Alert archive / Colorado / Winter Storm Warnings in 2011

Winter Storm Warning 5, NWS Grand Junction, CO

February 6, 201110 counties in Colorado

NWS Grand Junction, CO issued this winter storm warning at Feb 6, 2011, 2:28 PM MST for 10 counties in Colorado. It took effect at Feb 7, 2011, 9:45 AM MST. It was in force for 32 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: Feb 6, 2011, 2:28 PM MST (21:28 UTC)
In effect from: Feb 7, 2011, 9:45 AM MST
Expired: Feb 8, 2011, 6:00 PM MST
In force: 32 hr
Issued by: NWS Grand Junction, CO

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

The radar

The Grand Junction radar (KGJX), 64 km from the middle of the area, began a volume at 21:26 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, 9.5 hours before the alert went out and 382 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: 755 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -79 m²/s²
0-3 km storm-relative helicity: -35 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 Feb 6, 4:37 AM MST, 9 hours 51 minutes earlier.

Area forecast discussion, Feb 6, 4:37 AM MST, 9 hours 51 minutes before

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Hazardous weather outlook, Feb 6, 5:29 AM MST, 8 hours 59 minutes before

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In the hours before

Local storm report, Feb 6, 8:32 AM MST, 5 hours 56 minutes before

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Local storm report, Feb 6, 8:33 AM MST, 5 hours 55 minutes before

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Local storm report, Feb 6, 8:34 AM MST, 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
Feb 6, 4:26 AM MST	Winter Storm Watch	GJT	Delta, Eagle, Garfield, Gunnison, Moffat, Montrose and 3 more	10 hr
Feb 6, 2:28 PM MST	Winter Weather Advisory	GJT	Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more	54 hr

Nearby

Winter Storm Warnings in Colorado, 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.