Alert archive / Wisconsin / Mesoscale Discussions in 2008

Mesoscale Discussion 1802

July 17, 200814 counties in Iowa; Houston County, Minnesota; 36 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2008, 2:19 PM CDT for 14 counties in Iowa; Houston County, Minnesota; 36 counties in Wisconsin. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jul 17, 2008, 2:19 PM CDT (19:19 UTC)
Expired: Jul 17, 2008, 3:45 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 51 counties

Allamakee County, IA, Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Howard County, IA, Humboldt County, IA, Winneshiek County, IA, Wright County, IA, Houston County, MN, Adams County, WI, Brown County, WI, Calumet County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dodge County, WI, Fond du Lac County, WI, Forest County, WI, Grant County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Price County, WI, Richland County, WI, Sauk County, WI, Shawano County, WI, Taylor County, WI, Vernon County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 60 km from the middle of the area, began a volume at 19:21 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, 7.3 hours before the alert went out and 215 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: 983 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 732 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 17, 8:55 AM CDT	Mesoscale Discussion	SPC	Cerro Gordo, Clay, Dickinson, Emmet, Hancock, Howard and 6 more	65 min
Jul 17, 10:57 AM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 22 more	7 hr
Jul 17, 5:50 PM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Benton, Black Hawk, Boone, Bremer and 60 more	85 min
Jul 17, 6:26 PM CDT	Mesoscale Discussion	SPC	Fremont, Mills, Page	2 hr
Jul 16, 7:50 PM CDT	Severe Thunderstorm Watch	SPC	Big Stone, Traverse	5 hr
Jul 16, 11:54 PM CDT	Mesoscale Discussion	SPC	Big Stone, Lac qui Parle, Lincoln, Lyon, Stevens, Swift and 1 more	96 min
Jul 17, 12:14 PM CDT	Severe Thunderstorm Watch	SPC	Pine	5 hr

Nearby

Mesoscale Discussions in Wisconsin, 2008 Mesoscale Discussions in Iowa, 2008 Mesoscale Discussions in Minnesota, 2008 Every mesoscale discussion in 2008

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.