Alert archive / Wisconsin / Mesoscale Discussions in 2004

Mesoscale Discussion 360

April 17, 200411 counties in Iowa; 13 counties in Minnesota; 41 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2004, 11:50 PM CDT for 11 counties in Iowa; 13 counties in Minnesota; 41 counties in Wisconsin. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Apr 17, 2004, 11:50 PM CDT (04:50 UTC)
Expired
Apr 18, 2004, 1:15 AM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 65 counties

Cerro Gordo County, IA, Emmet County, IA, Hancock County, IA, Howard County, IA, Humboldt County, IA, Kossuth County, IA, Mitchell County, IA, Palo Alto County, IA, Pocahontas County, IA, Winnebago County, IA, Worth County, IA, Blue Earth County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Houston County, MN, Martin County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Adams County, WI, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Columbia County, WI, Dane County, WI, Dunn County, WI, Eau Claire County, WI, Fond du Lac County, WI, Forest County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Pepin County, WI, Pierce County, WI, Portage County, WI, Price County, WI, Richland County, WI, Rusk County, WI, Saint Croix County, WI, Sauk County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 56 km from the middle of the area, began a volume at 04:49 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 4.8 hours before the alert went out and 219 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 00:00Z on 2004-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 00:00Z on 2004-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2208 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
Apr 17, 7:45 PM CDTSevere Thunderstorm WatchSPCAllamakee, Cerro Gordo, Chickasaw, Emmet, Floyd, Hancock and 7 more5 hr
Apr 17, 9:31 PM CDTMesoscale DiscussionSPCAllamakee, Cerro Gordo, Chickasaw, Emmet, Fayette, Floyd and 8 more119 min
Apr 17, 10:05 PM CDTTornado WatchSPCAllamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 19 more5 hr
Apr 17, 11:10 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Lyon, O'Brien and 3 more95 min
Apr 17, 11:35 PM CDTSevere Thunderstorm WatchSPCClay, Dickinson, Lyon, O'Brien, Osceola, Sioux5 hr
Apr 18, 4:15 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Cerro Gordo, Cherokee, Clay, Dickinson and 20 more60 min
Apr 18, 4:40 PM CDTTornado WatchSPCAudubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 29 more5 hr
Apr 18, 12:30 AM CDTSevere Thunderstorm WatchSPCAnoka, Carver, Chisago, Dakota, Goodhue, Hennepin and 11 more5 hr
Apr 18, 2:37 AM CDTMesoscale DiscussionSPCAitkin, Anoka, Benton, Big Stone, Brown, Carlton and 40 more53 min
Apr 18, 4:43 AM CDTMesoscale DiscussionSPCAitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 15 more32 min
Apr 18, 8:04 AM CDTMesoscale DiscussionSPCAitkin, Benton, Carlton, Cass, Crow Wing, Douglas and 6 more86 min
Apr 18, 12:39 PM CDTMesoscale DiscussionSPCAitkin, Anoka, Benton, Big Stone, Carlton, Carver and 32 more2 hr
Apr 18, 1:40 PM CDTTornado WatchSPCAitkin, Anoka, Benton, Carlton, Carver, Chippewa and 32 more6 hr
Apr 18, 2:20 PM CDTSevere Thunderstorm WatchSPCLincoln, Lyon, Pipestone, Rock6 hr
Apr 18, 3:33 PM CDTMesoscale DiscussionSPCAitkin, Anoka, Benton, Carlton, Chisago, Crow Wing and 12 more117 min
Apr 18, 5:23 PM CDTMesoscale DiscussionSPCLincoln, Lyon, Pipestone, Rock2 hr
Apr 18, 6:35 PM CDTTornado WatchSPCBrown, Carver, Dakota, Goodhue, Hennepin, Le Sueur and 7 more5 hr
Apr 18, 1:49 AM CDTMesoscale DiscussionSPCCalumet, Columbia, Dane, Dodge, Fond du Lac, Green and 11 more56 min

Nearby

Mesoscale Discussions in Wisconsin, 2004Mesoscale Discussions in Minnesota, 2004Mesoscale Discussions in Iowa, 2004Every 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.