Alert archive / Wisconsin / Mesoscale Discussions in 2019

Mesoscale Discussion 2014

September 24, 2019Olmsted County, Wabasha County, Winona County, Minnesota; 8 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 24, 2019, 7:45 PM CDT for Olmsted County, Wabasha County, Winona County, Minnesota; 8 counties in Wisconsin. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Sep 24, 2019, 7:45 PM CDT (00:45 UTC)
Expired: Sep 24, 2019, 8:45 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Olmsted County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, Pepin County, WI, Trempealeau County, WI

The radar

The La Crosse radar (KARX), 82 km from the middle of the area, began a volume at 00:50 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, 0.8 hours before the alert went out and 164 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: 1764 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1238 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 10.5

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 24, 7:17 PM CDT	Tornado Watch	SPC	Houston	4 hr
Sep 24, 9:01 PM CDT	Mesoscale Discussion	SPC	Houston, Winona	119 min
Sep 24, 10:48 PM CDT	Mesoscale Discussion	SPC	Houston, Winona	117 min

Nearby

Mesoscale Discussions in Wisconsin, 2019 Mesoscale Discussions in Minnesota, 2019 Every mesoscale discussion in 2019

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.