Alert archive / Wisconsin / Mesoscale Discussions in 2006

Mesoscale Discussion 1879

August 25, 20069 counties in Iowa; 6 counties in Minnesota; 20 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2006, 2:27 AM CDT for 9 counties in Iowa; 6 counties in Minnesota; 20 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 25, 2006, 2:27 AM CDT (07:27 UTC)
Expired
Aug 25, 2006, 4:30 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 35 counties

Allamakee County, IA, Chickasaw County, IA, Clayton County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Monroe County, WI, Richland County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 62 km from the middle of the area, began a volume at 07:30 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 nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.5 hours before the alert went out and 203 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 2006-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 228 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 2006-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
228 J/kg
Mixed-layer CIN
-313 J/kg
Mixed-layer LCL
1898 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
197 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
Aug 24, 9:08 PM CDTMesoscale DiscussionSPCAllamakee, Buena Vista, Cerro Gordo, Cherokee, Chickasaw, Clay and 20 more97 min
Aug 24, 11:24 PM CDTMesoscale DiscussionSPCAllamakee, Chickasaw, Clay, Clayton, Dickinson, Emmet and 8 more96 min
Aug 24, 11:52 PM CDTSevere Thunderstorm WatchSPCAllamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more6 hr
Aug 25, 5:05 AM CDTMesoscale DiscussionSPCAllamakee, Benton, Buchanan, Clayton, Delaware, Dubuque and 5 more55 min
Aug 25, 1:42 PM CDTMesoscale DiscussionSPCScott2 hr
Aug 25, 6:38 PM CDTMesoscale DiscussionSPCClinton, Jackson2 hr
Aug 24, 9:32 PM CDTMesoscale DiscussionSPCAdams, Calumet, Clark, Columbia, Crawford, Dane and 24 more88 min
Aug 25, 11:35 AM CDTMesoscale DiscussionSPCJefferson, Kenosha, Milwaukee, Racine, Rock, Walworth and 1 more115 min

Nearby

Mesoscale Discussions in Wisconsin, 2006Mesoscale Discussions in Iowa, 2006Mesoscale Discussions in Minnesota, 2006Every mesoscale discussion in 2006

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.