Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 767

May 12, 201118 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 12, 2011, 6:16 PM CDT for 18 counties in Wisconsin. It was in force for 29 min.

The area

The outline as issued.

The facts

Issued: May 12, 2011, 6:16 PM CDT (23:16 UTC)
Expired: May 12, 2011, 6:45 PM CDT
In force: 29 min
Issued by: the Storm Prediction Center

Counties Brown County, WI, Calumet County, WI, Clark County, WI, Forest County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Taylor County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 86 km from the middle of the area, began a volume at 23:17 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.3 hours before the alert went out and 87 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: 122 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 929 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 130 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 12, 1:08 PM CDT	Mesoscale Discussion	SPC	Adams, Calumet, Chippewa, Clark, Columbia, Dane and 28 more	67 min
May 12, 1:41 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Calumet, Chippewa, Clark, Columbia and 50 more	5 hr

Nearby

Mesoscale Discussions in Wisconsin, 2011 Every mesoscale discussion in 2011

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.