Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1723

August 11, 20075 counties in Minnesota; 10 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2007, 5:15 AM CDT for 5 counties in Minnesota; 10 counties in Wisconsin. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued: Aug 11, 2007, 5:15 AM CDT (10:15 UTC)
Expired: Aug 11, 2007, 5:45 AM CDT
In force: 30 min
Issued by: the Storm Prediction Center

Counties Goodhue County, MN, Le Sueur County, MN, Rice 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, Pierce County, WI, Taylor County, WI, Trempealeau County, WI

The radar

The Minneapolis radar (KMPX), 104 km from the middle of the area, began a volume at 10:16 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, 10.3 hours before the alert went out and 107 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: 639 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1768 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Aug 11, 12:58 AM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Big Stone, Carver, Chippewa, Chisago and 32 more	62 min
Aug 11, 1:31 AM CDT	Severe Thunderstorm Watch	SPC	Anoka, Benton, Brown, Carver, Chippewa, Chisago and 27 more	4 hr
Aug 11, 3:00 AM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Blue Earth, Brown, Carver, Chisago and 26 more	60 min
Aug 11, 3:01 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Chippewa, Cottonwood, Dakota and 33 more	89 min
Aug 11, 6:21 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Anoka, Blue Earth, Brown, Carlton, Carver and 27 more	6 hr
Aug 11, 6:31 PM CDT	Mesoscale Discussion	SPC	Cook, Lake	119 min

Nearby

Mesoscale Discussions in Wisconsin, 2007 Mesoscale Discussions in Minnesota, 2007 Every mesoscale discussion in 2007

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.