Alert archive / Minnesota / Winter Weather Advisories in 2013

Winter Weather Advisory 30, NWS Twin Cities, MN

December 7, 201321 counties in Minnesota; 9 counties in Wisconsin

NWS Twin Cities, MN issued this winter weather advisory at Dec 7, 2013, 2:17 PM CST for 21 counties in Minnesota; 9 counties in Wisconsin. It took effect at Dec 8, 2013, 4:00 AM CST. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued: Dec 7, 2013, 2:17 PM CST (20:17 UTC)
In effect from: Dec 8, 2013, 4:00 AM CST
Expired: Dec 8, 2013, 8:59 PM CST
In force: 17 hr
Issued by: NWS Twin Cities, MN

All 30 counties

Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chisago County, MN, Dakota County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Le Sueur County, MN, Martin County, MN, Nicollet County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Barron County, WI, Chippewa County, WI, Dunn County, WI, Eau Claire County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Rusk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 44 km from the middle of the area, began a volume at 20:14 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.3 hours before the alert went out and 397 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: 1061 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: -81 m²/s²
0-3 km storm-relative helicity: -4 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 weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Twin Cities, MN wrote its last area forecast discussion before this winter weather advisory went out at Dec 7, 12:27 PM CST, 1 hour 50 minutes earlier.

Area forecast discussion, Dec 7, 12:27 PM CST, 1 hour 50 minutes before

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Hazardous weather outlook, Dec 7, 12:46 PM CST, 1 hour 31 minutes before

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Nearby

Winter Weather Advisories in Minnesota, 2013 Winter Weather Advisories in Wisconsin, 2013 Every winter weather advisory in 2013

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.