Alert archive / Wisconsin / Mesoscale Discussions in 2003

Mesoscale Discussion 1601

July 4, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2003, 3:27 AM CDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Jul 4, 2003, 3:27 AM CDT (08:27 UTC)
Expired
Jul 4, 2003, 5:00 AM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 89 counties

Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Grundy County, IA, Howard County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Scott County, IA, Tama County, IA, Winneshiek County, IA, Boone County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Fillmore County, MN, Goodhue County, MN, Houston County, MN, Olmsted County, MN, Ramsey County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Calumet County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Dunn County, WI, Eau Claire County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Milwaukee County, WI, Monroe County, WI, Ozaukee County, WI, Pepin County, WI, Pierce County, WI, Portage County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Saint Croix County, WI, Sauk County, WI, Sheboygan County, WI, Trempealeau County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 88 km from the middle of the area, began a volume at 08:30 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

Davenport, (KDVN), launched 00:00Z, 8.5 hours before the alert went out and 164 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 2003-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1426 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 2003-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 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
1426 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1629 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
131 m²/s²
Significant tornado parameter
0.1
Supercell composite
5.2

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 4, 1:15 AM CDTSevere Thunderstorm WatchSPCCarroll, Jo Daviess, Lee, Ogle, Rock Island, Stephenson and 2 more6 hr
Jul 4, 5:20 AM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Kane, Lake and 1 more4 hr
Jul 4, 7:25 AM CDTMesoscale DiscussionSPCCook, Lake, McHenry95 min
Jul 4, 12:48 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more117 min
Jul 4, 2:20 PM CDTSevere Thunderstorm WatchSPCBureau, Champaign, DeWitt, Ford, Fulton, Grundy and 21 more6 hr
Jul 4, 3:29 PM CDTMesoscale DiscussionSPCChampaign, DeWitt, Douglas, Ford, Iroquois, Kankakee and 4 more2 hr
Jul 4, 5:07 PM CDTMesoscale DiscussionSPCBond, Clark, Clay, Clinton, Coles, Crawford and 27 more53 min
Jul 4, 6:29 PM CDTMesoscale DiscussionSPCBureau, Champaign, Clark, Coles, DeWitt, Douglas and 29 more61 min
Jul 3, 8:11 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more94 min
Jul 3, 9:40 PM CDTSevere Thunderstorm WatchSPCBoone, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 22 more6 hr
Jul 3, 11:23 PM CDTMesoscale DiscussionSPCAllamakee, Boone, Bremer, Buena Vista, Butler, Calhoun and 36 more97 min
Jul 4, 12:42 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Boone, Bremer, Butler, Calhoun and 24 more63 min
Jul 3, 10:22 PM CDTMesoscale DiscussionSPCBecker, Clay, Douglas, Grant, Hubbard, Otter Tail and 3 more23 min
Jul 3, 10:40 PM CDTSevere Thunderstorm WatchSPCAitkin, Becker, Carlton, Cass, Clay, Crow Wing and 14 more5 hr
Jul 4, 12:25 AM CDTMesoscale DiscussionSPCTraverse2 hr
Jul 4, 7:50 AM CDTSevere Thunderstorm WatchSPCManitowoc3 hr

Nearby

Mesoscale Discussions in Wisconsin, 2003Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Illinois, 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.