Alert archive / Wisconsin / Mesoscale Discussions in 2008

Mesoscale Discussion 778

May 2, 20087 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 2, 2008, 6:47 PM CDT for 7 counties in Wisconsin. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 2, 2008, 6:47 PM CDT (23:47 UTC)
Expired: May 2, 2008, 8:15 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center

Counties Columbia County, WI, Dodge County, WI, Fond du Lac County, WI, Green Lake County, WI, Jefferson County, WI, Marquette County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 82 km from the middle of the area, began a volume at 23:47 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, 11.8 hours before the alert went out and 127 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: 589 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 189 m²/s²
0-3 km storm-relative helicity: 148 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
May 2, 11:05 AM CDT	Mesoscale Discussion	SPC	Crawford, Dane, Grant, Green, Iowa, Lafayette and 3 more	115 min
May 2, 3:05 PM CDT	Mesoscale Discussion	SPC	Rock	115 min
May 2, 3:47 PM CDT	Mesoscale Discussion	SPC	Adams, Columbia, Crawford, Dane, Dodge, Fond du Lac and 11 more	118 min
May 2, 4:31 PM CDT	Tornado Watch	SPC	Adams, Columbia, Crawford, Dane, Dodge, Grant and 14 more	3 hr

Nearby

Mesoscale Discussions in Wisconsin, 2008 Every mesoscale discussion in 2008

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.