Alert archive / Wisconsin / Mesoscale Discussions in 2003

Mesoscale Discussion 2035

July 31, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2003, 5:07 PM CDT for 4 states. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Jul 31, 2003, 5:07 PM CDT (22:07 UTC)
Expired
Jul 31, 2003, 6:00 PM CDT
In force
53 min
Issued by
the Storm Prediction Center
All 68 counties

Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Howard County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Winneshiek County, IA, Boone County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Jo Daviess County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Winnebago County, IL, Fillmore County, MN, Houston County, MN, Winona County, MN, Adams County, WI, Brown County, WI, Calumet County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge 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, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Richland County, WI, Rock County, WI, Sauk 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), 96 km from the middle of the area, began a volume at 22:10 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 12:00Z, 10.1 hours before the alert went out and 155 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 12:00Z on 2003-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 51 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 12:00Z on 2003-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939Sfc1 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
51 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
1404 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
61 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
Jul 31, 12:00 PM CDTSevere Thunderstorm WatchSPCJo Daviess6 hr
Jul 31, 2:38 PM CDTMesoscale DiscussionSPCJo Daviess2 hr
Jul 31, 5:40 PM CDTSevere Thunderstorm WatchSPCBoone, Carroll, Jo Daviess, McHenry, Ogle, Stephenson and 1 more5 hr
Jul 31, 10:28 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Boone, Bremer, Butler, Cerro Gordo and 15 more2 hr
Jul 30, 8:05 PM CDTMesoscale DiscussionSPCBig Stone, Grant, Stevens, Traverse, Wilkin115 min

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.