Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1557

July 10, 2011Winona County, Minnesota; 27 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2011, 6:39 AM CDT for Winona County, Minnesota; 27 counties in Wisconsin. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jul 10, 2011, 6:39 AM CDT (11:39 UTC)
Expired: Jul 10, 2011, 7:45 AM CDT
In force: 66 min
Issued by: the Storm Prediction Center

All 28 counties

Winona County, MN, Adams County, WI, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Outagamie County, WI, Pepin County, WI, Portage County, WI, Price County, WI, Rusk County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Waupaca County, WI, Waushara County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 102 km from the middle of the area, began a volume at 11:43 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

Minneapolis, MN (KMPX), launched 00:00Z, 11.7 hours before the alert went out and 228 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: 1607 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1076 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 7.3

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
Jul 10, 1:03 AM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Cottonwood, Faribault, Jackson, Lincoln and 8 more	117 min
Jul 10, 2:29 PM CDT	Tornado Watch	SPC	Big Stone, Clay, Grant, Otter Tail, Traverse, Wilkin	7 hr
Jul 10, 5:25 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Big Stone, Blue Earth, Brown, Carver and 35 more	95 min
Jul 10, 6:12 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 36 more	8 hr

Nearby

Mesoscale Discussions in Wisconsin, 2011 Mesoscale Discussions in Minnesota, 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.