Alert archive / Minnesota / Winter Weather Advisories in 2015

Winter Weather Advisory 20, NWS Twin Cities, MN

December 23, 20158 counties in Minnesota; 7 counties in Wisconsin

NWS Twin Cities, MN issued this winter weather advisory at Dec 23, 2015, 1:30 PM CST for 8 counties in Minnesota; 7 counties in Wisconsin. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Dec 23, 2015, 1:30 PM CST (19:30 UTC)
Expired: Dec 23, 2015, 10:03 PM CST
In force: 9 hr
Issued by: NWS Twin Cities, MN

Counties Chisago County, MN, Dakota County, MN, Freeborn County, MN, Goodhue County, MN, Ramsey County, MN, Rice County, MN, Steele County, MN, Washington County, MN, Barron County, WI, Dunn County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Rusk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 77 km from the middle of the area, began a volume at 19:34 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

Davenport, (KDVN), launched 12:00Z, 7.5 hours before the alert went out and 394 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: 1366 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 229 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 23, 11:33 AM CST, 1 hour 57 minutes earlier.

Area forecast discussion, Dec 23, 11:33 AM CST, 1 hour 57 minutes before

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Hazardous weather outlook, Dec 23, 12:43 PM CST, 47 minutes before

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In the hours before

Special weather statement, Dec 23, 9:10 AM CST, 4 hours 20 minutes before

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The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 23, 3:22 AM CST	Winter Weather Advisory	MPX	Barron, Polk, Saint Croix	10 hr
Dec 23, 1:30 PM CST	Winter Storm Warning	MPX	Barron, Polk, Saint Croix	6 hr

Nearby

Winter Weather Advisories in Minnesota, 2015 Winter Weather Advisories in Wisconsin, 2015 Every winter weather advisory in 2015

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.