Alert archive / Wisconsin / Mesoscale Discussions in 2004

Mesoscale Discussion 1861

August 3, 20044 counties in Iowa; Houston County, Minnesota; 5 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2004, 5:07 PM CDT for 4 counties in Iowa; Houston County, Minnesota; 5 counties in Wisconsin. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Aug 3, 2004, 5:07 PM CDT (22:07 UTC)
Expired: Aug 3, 2004, 6:00 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

Counties Allamakee County, IA, Clayton County, IA, Fayette County, IA, Winneshiek County, IA, Houston County, MN, Crawford County, WI, Grant County, WI, La Crosse County, WI, Richland County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 52 km from the middle of the area, began a volume at 22:06 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

Davenport, (KDVN), launched 12:00Z, 10.1 hours before the alert went out and 213 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: 760 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 16 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 3, 2:02 AM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Boone, Buena Vista, Butler, Calhoun and 30 more	118 min
Aug 3, 7:21 AM CDT	Mesoscale Discussion	SPC	Lyon	54 min
Aug 3, 10:48 AM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Buena Vista, Butler and 32 more	87 min
Aug 3, 11:05 AM CDT	Severe Thunderstorm Watch	SPC	Bremer, Buena Vista, Butler, Calhoun, Cerro Gordo, Cherokee and 25 more	6 hr
Aug 3, 1:16 PM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Boone, Bremer, Buchanan, Buena Vista and 46 more	89 min
Aug 3, 2:25 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more	5 hr
Aug 3, 3:00 PM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Carroll, Cass, Crawford, Greene and 8 more	2 hr
Aug 3, 3:55 PM CDT	Mesoscale Discussion	SPC	Adair, Appanoose, Benton, Black Hawk, Boone, Buchanan and 43 more	95 min
Aug 3, 4:25 PM CDT	Tornado Watch	SPC	Appanoose, Benton, Black Hawk, Boone, Buchanan, Cedar and 39 more	6 hr
Aug 3, 4:52 PM CDT	Mesoscale Discussion	SPC	Adams, Audubon, Cass, Fremont, Harrison, Mills and 5 more	53 min
Aug 3, 5:00 PM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more	5 hr
Aug 3, 5:39 PM CDT	Mesoscale Discussion	SPC	Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 32 more	66 min
Aug 3, 6:34 PM CDT	Mesoscale Discussion	SPC	Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 28 more	86 min
Aug 3, 6:45 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more	90 min
Aug 3, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more	5 hr
Aug 3, 6:43 PM CDT	Mesoscale Discussion	SPC	Crawford, Grant, Richland	32 min

Nearby

Mesoscale Discussions in Wisconsin, 2004 Mesoscale Discussions in Iowa, 2004 Mesoscale Discussions in Minnesota, 2004 Every mesoscale discussion in 2004

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.