Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 2258

December 23, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2007, 12:37 AM CST for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Dec 23, 2007, 12:37 AM CST (06:37 UTC)
Expired: Dec 23, 2007, 6:30 AM CST
In force: 6 hr
Issued by: the Storm Prediction Center

All 33 counties

Allamakee County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Jo Daviess County, IL, Houston County, MN, Adams County, WI, Chippewa County, WI, Clark County, WI, Crawford County, WI, Eau Claire County, WI, Grant County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Lincoln County, WI, Marathon County, WI, Marquette County, WI, Monroe County, WI, Portage County, WI, Price County, WI, Richland County, WI, Rusk County, WI, Sauk County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 84 km from the middle of the area, began a volume at 06:42 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 00:00Z, 6.6 hours before the alert went out and 177 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: 537 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 22, 6:46 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Carroll, Fulton, Hancock, Henderson and 12 more	4 hr

Nearby

Mesoscale Discussions in Wisconsin, 2007 Mesoscale Discussions in Iowa, 2007 Mesoscale Discussions in Illinois, 2007 Every mesoscale discussion in 2007

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.