Alert archive / Wisconsin / Mesoscale Discussions in 2013

Mesoscale Discussion 893

May 30, 201313 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 9:14 PM CDT for 13 counties in Wisconsin. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: May 30, 2013, 9:14 PM CDT (02:14 UTC)
Expired: May 30, 2013, 10:15 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

Counties Brown County, WI, Calumet County, WI, Kenosha County, WI, Kewaunee County, WI, Manitowoc County, WI, Marinette County, WI, Milwaukee County, WI, Oconto County, WI, Outagamie County, WI, Ozaukee County, WI, Racine County, WI, Sheboygan County, WI, Washington County, WI

The radar

The Green Bay radar (KGRB), 50 km from the middle of the area, began a volume at 02:15 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, 2.2 hours before the alert went out and 48 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: 630 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1294 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.7

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 31, 2:12 PM CDT	Mesoscale Discussion	SPC	Barron, Buffalo, Burnett, Chippewa, Clark, Douglas and 22 more	2 hr
May 31, 2:35 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Ashland, Barron, Bayfield, Buffalo, Burnett and 35 more	9 hr

Nearby

Mesoscale Discussions in Wisconsin, 2013 Every mesoscale discussion in 2013

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.