Alert archive / Wisconsin / Mesoscale Discussions in 2003

Mesoscale Discussion 1646

July 6, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2003, 5:17 AM CDT for 4 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Jul 6, 2003, 5:17 AM CDT (10:17 UTC)
Expired
Jul 6, 2003, 7:15 AM CDT
In force
118 min
Issued by
the Storm Prediction Center
All 33 counties

Allamakee County, IA, Cedar County, IA, Clinton County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Carroll County, IL, Jo Daviess County, IL, Stephenson County, IL, Whiteside County, IL, Dodge County, MN, Goodhue County, MN, Houston County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Crawford County, WI, Dane County, WI, Eau Claire County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Monroe County, WI, Pepin County, WI, Richland County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 53 km from the middle of the area, began a volume at 10:18 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 00:00Z, 10.3 hours before the alert went out and 200 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, Davenport, at 00:00Z on 2003-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 628 joules per kilogram.LCLLFCEL10008507005003002001001 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, Davenport, at 00:00Z on 2003-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 133 square meters per square second.193958Sfc1 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
628 J/kg
Mixed-layer CIN
-140 J/kg
Mixed-layer LCL
1685 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
133 m²/s²
0-3 km storm-relative helicity
261 m²/s²
Significant tornado parameter
0.1
Supercell composite
8.4

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
Jul 5, 7:20 PM CDTMesoscale DiscussionSPCEdgar, Iroquois, Vermilion55 min
Jul 5, 7:51 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Champaign, Christian, Clark and 40 more54 min
Jul 5, 10:46 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Champaign, Christian, Clark and 33 more59 min
Jul 6, 7:45 AM CDTMesoscale DiscussionSPCBoone, DeKalb, DuPage, Kane, Lake, McHenry2 hr
Jul 6, 9:48 AM CDTMesoscale DiscussionSPCAdams, Boone, Brown, Bureau, Carroll, Cass and 34 more117 min
Jul 6, 11:45 AM CDTTornado WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more6 hr
Jul 6, 12:36 PM CDTMesoscale DiscussionSPCCook, Kankakee114 min
Jul 6, 1:10 PM CDTSevere Thunderstorm WatchSPCChampaign, Christian, Clark, Coles, Cumberland, DeWitt and 14 more5 hr
Jul 6, 2:00 PM CDTMesoscale DiscussionSPCBoone, Brown, Cass, Champaign, Christian, Coles and 35 more2 hr
Jul 6, 5:28 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Champaign, Christian, Coles and 45 more62 min
Jul 6, 6:00 PM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Ford, Grundy and 9 more5 hr
Jul 5, 7:20 PM CDTTornado WatchSPCFremont, Harrison, Mills, Monona, Page, Pottawattamie and 1 more6 hr
Jul 5, 8:04 PM CDTMesoscale DiscussionSPCClay, Dickinson, Emmet, Lyon, O'Brien, Osceola and 2 more86 min
Jul 5, 10:57 PM CDTMesoscale DiscussionSPCFremont, Harrison, Mills, Monona, Montgomery, Page and 1 more63 min
Jul 5, 11:50 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Carroll and 36 more5 hr
Jul 6, 2:26 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Benton, Black Hawk, Boone and 49 more94 min
Jul 6, 4:33 AM CDTMesoscale DiscussionSPCAdair, Audubon, Carroll, Cass, Clarke, Crawford and 12 more87 min
Jul 6, 4:08 AM CDTMesoscale DiscussionSPCBeltrami, Clearwater, Koochiching, Pennington, Polk, Red Lake2 hr
Jul 6, 12:56 PM CDTMesoscale DiscussionSPCAitkin, Carlton, Itasca, Koochiching, Lake of the Woods, Saint Louis109 min
Jul 6, 1:40 PM CDTMesoscale DiscussionSPCBecker, Beltrami, Clay, Clearwater, Mahnomen, Marshall and 4 more3 hr
Jul 6, 2:20 PM CDTTornado WatchSPCAitkin, Becker, Beltrami, Cass, Clay, Clearwater and 11 more8 hr
Jul 6, 4:56 PM CDTMesoscale DiscussionSPCBenton, Big Stone, Chippewa, Kanabec, Kandiyohi, Lac qui Parle and 15 more2 hr
Jul 6, 5:29 PM CDTMesoscale DiscussionSPCAitkin, Becker, Beltrami, Cass, Clay, Clearwater and 11 more2 hr
Jul 6, 6:54 PM CDTMesoscale DiscussionSPCAnoka, Benton, Carlton, Chisago, Cook, Douglas and 14 more4 hr

Nearby

Mesoscale Discussions in Wisconsin, 2003Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Minnesota, 2003Every mesoscale discussion in 2003

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.