Alert archive / Wisconsin / Winter Storm Watches in 2009

Winter Storm Watch 7, NWS Milwaukee, WI

December 22, 200920 counties in Wisconsin

NWS Milwaukee, WI issued this winter storm watch at Dec 22, 2009, 11:17 AM CST for 20 counties in Wisconsin. It took effect at Dec 23, 2009, 4:00 PM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Dec 22, 2009, 11:17 AM CST (17:17 UTC)
In effect from: Dec 23, 2009, 4:00 PM CST
Expired: Dec 23, 2009, 3:54 AM CST
In force
Issued by: NWS Milwaukee, WI

Counties Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Marquette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sauk County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 31 km from the middle of the area, began a volume at 17:17 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

Lincoln, IL (KILX), launched 12:00Z, 5.3 hours before the alert went out and 336 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: 968 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 264 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 watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Milwaukee, WI wrote its last area forecast discussion before this winter storm watch went out at Dec 22, 3:36 AM CST, 7 hours 41 minutes earlier.

Area forecast discussion, Dec 22, 3:36 AM CST, 7 hours 41 minutes before

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Hazardous weather outlook, Dec 22, 4:23 AM CST, 6 hours 54 minutes before

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In the hours before

Local storm report, Dec 22, 7:23 AM CST, 3 hours 54 minutes before

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Local storm report, Dec 22, 9:06 AM CST, 2 hours 11 minutes before

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Local storm report, Dec 22, 10:50 AM CST, 27 minutes before

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Local storm report, Dec 22, 11:06 AM CST, 11 minutes before

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The office that day

Everything else NWS Milwaukee, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 22, 3:44 AM CST	Small Craft Advisory	MKX		56 hr
Dec 22, 3:30 PM CST	Gale Watch	MKX		13 hr

Nearby

Winter Storm Watches in Wisconsin, 2009 Every winter storm watch in 2009

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.