Alert archive / Wisconsin / Tornado Watches in 2006

Tornado Watch 734

August 23, 2006Allamakee County, Clayton County, Winneshiek County, Iowa; 6 counties in Minnesota; 34 counties in Wisconsin

The Storm Prediction Center issued this tornado watch at Aug 23, 2006, 2:32 PM CDT for Allamakee County, Clayton County, Winneshiek County, Iowa; 6 counties in Minnesota; 34 counties in Wisconsin. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Aug 23, 2006, 2:32 PM CDT (19:32 UTC)
Expired
Aug 23, 2006, 9:58 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 43 counties

Allamakee County, IA, Clayton County, IA, Winneshiek County, IA, Fillmore County, MN, Goodhue County, MN, Houston 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, 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, Racine 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

The radar

The La Crosse radar (KARX), 47 km from the middle of the area, began a volume at 19:32 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 23, 2:39 PM CDTSevere Thunderstorm WarningMKXRacine21 min
Aug 23, 3:47 PM CDTSevere Thunderstorm WarningMKXMilwaukee28 min
Aug 23, 4:18 PM CDTSevere Thunderstorm WarningMPXEau Claire27 min
Aug 23, 5:31 PM CDTTornado WarningARXJackson44 min
Aug 23, 6:16 PM CDTSevere Thunderstorm WarningARXClark, Jackson47 min
Aug 23, 6:41 PM CDTSevere Thunderstorm WarningARXMonroe64 min
Aug 23, 7:05 PM CDTSevere Thunderstorm WarningARXJuneau25 min
Aug 23, 7:16 PM CDTSevere Thunderstorm WarningMKXSauk74 min
Aug 23, 7:23 PM CDTSevere Thunderstorm WarningARXVernon47 min
Aug 23, 7:28 PM CDTSevere Thunderstorm WarningARXJuneau46 min
Aug 23, 7:32 PM CDTSevere Thunderstorm WarningARXJackson28 min
Aug 23, 7:45 PM CDTSevere Thunderstorm WarningARXMonroe30 min
Aug 23, 8:16 PM CDTTornado WarningMKXSauk59 min
Aug 23, 8:33 PM CDTSevere Thunderstorm WarningARXJackson, Juneau, Monroe30 min
Aug 23, 8:44 PM CDTSevere Thunderstorm WarningARXJuneau, Monroe, Vernon29 min
Aug 23, 8:47 PM CDTTornado WarningMKXDane, Iowa58 min
Aug 23, 9:11 PM CDTSevere Thunderstorm WarningMKXMarquette64 min
Aug 23, 9:13 PM CDTTornado WarningMKXSauk62 min
Aug 23, 9:18 PM CDTSevere Thunderstorm WarningARXMonroe27 min
Aug 23, 9:43 PM CDTSevere Thunderstorm WarningARXJuneau, Monroe42 min
Aug 23, 9:43 PM CDTTornado WarningMKXDane, Iowa77 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.5 hours before the alert went out and 211 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 12:00Z on 2006-08-23Temperature 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 12:00Z on 2006-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1381 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 23, 1:17 PM CDTMesoscale DiscussionSPCAllamakee, Winneshiek88 min
Aug 22, 7:00 PM CDTMesoscale DiscussionSPCBecker, Benton, Clay, Douglas, Grant, Kandiyohi and 12 more2 hr
Aug 22, 7:49 PM CDTSevere Thunderstorm WatchSPCBecker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 4 more7 hr
Aug 22, 10:02 PM CDTMesoscale DiscussionSPCBecker, Benton, Clay, Douglas, Grant, Kandiyohi and 12 more88 min
Aug 22, 10:16 PM CDTSevere Thunderstorm WatchSPCAnoka, Benton, Big Stone, Carver, Chippewa, Chisago and 25 more7 hr
Aug 23, 3:19 AM CDTSevere Thunderstorm WatchSPCBlue Earth, Brown, Dodge, Faribault, Fillmore, Freeborn and 12 more7 hr
Aug 23, 7:50 AM CDTMesoscale DiscussionSPCBlue Earth, Brown, Dodge, Faribault, Fillmore, Freeborn and 11 more115 min

Nearby

Tornado Watches in Wisconsin, 2006Tornado Watches in Minnesota, 2006Tornado Watches in Iowa, 2006Every tornado watch 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.