Severe Weather Over Southern Wisconsin on Wed June 8, 2011 (Updated 755 pm 6/9)

Severe weather in the form of 1 weak tornado, large hail, and damaging thunderstorm downburst winds affected parts of south-central and southeast Wisconsin on Wednesday, June 8, 2011.

The severe weather was related to a vigorous cold front which swept through southern Wisconsin during the mid-afternoon and evening hours Wednesday. Very warm, moist air ahead of the front clashed with drier, cooler air feeding in from the north behind the front.  This clash of air masses produced strong thunderstorms over southern Wisconsin.  Some of the thunderstorms became severe, producing large hail and damaging straight-line winds. 

The weak tornado, rated EF1, spun up in central Dane county, as verified by a National Weather Service damage survey crew on Thursday, June 9th.  Assistance with the survey was provided by members of the MidWest Severe Storm Tracking/Response Center.  The tornado spun up about 2.5 miles west-southwest of Verona around 741 pm CDT and continued for approximately 21 minutes.  It dissipated around 802 pm CDT about 3 miles northeast of McFarland. 

Damage consisted primarily of uprooted trees and broken tree branches which fell on power-lines. In Verona, damaged trees or tree branches crushed a garage, and damaged at least one home and a vehicle.  Scattered power-outages were noted.  Some minor roof shingle damage was seen. The tornado had a maximum width of 100 yards.  The path length was about 17.6 miles. This tornado was rated at the bottom of the EF1 category with wind speeds of about 86 to 90 mph.  Damage along the path was sporadic. There have been no reports of injuries or fatalities with the severe weather on Wednesday.

Below is the visible satellite image taken at 310 pm CDT, just before thunderstorm initiation in southwest Wisconsin.  Click on image for larger version.

Satellite image before initiation

Click on the thumbnail image below for an animation loop of the visible satellite imagery from 310 pm through 8 pm CDT.  Watch the strong thunderstorms develop over southern Wisconsin extending into Iowa.  Look for the pronounced overshooting tops on the thunderstorms, which are indicative of strong upward rising air and severe thunderstorms.

thumbnail

 Below is a plot of the tornado path in central Dane County:  Click on image for larger version.

tor path

Here are pictures of damage seen in the city of Verona.  The first eight pictures were taken by Gary Cannalte, Chief Meteorologist at WISC TV-3 in Madison.  The last two pictures were taken by Dale Bernstein, President of MidWest SSTRC.  Click on images for larger version.

verona 1  verona 2   verona 3

verona 4  verona 5  verona 6

verona 7  verona 8

 bernstein 1  bernstein 2

Below are radar reflectivity and storm-relative velocity loops showing the thunderstorms moving through the Madison area that produced the tornado in Verona. Click on images for larger version.

     

Strong thunderstorms also produced damaging straight-line winds up to 80 mph across portions of South Central into Southeast Wisconsin. Below are radar reflectivity and base velocity images showing this damaging wind event. Click on images for larger version

    

Below are graphics illustrating the severe weather events reported to the National Weather Service office in Sullivan on Wednesday.  The map on the left shows what was reported prior to 7 pm CDT, and the map on the right shows what was reported after 7 pm CDT.  Click on images for larger versions.

June 8 local storm report graphic   June 9 local storm report graphic

Here is a text listing of the above severe weather reports:

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
756 AM CDT THU JUN 09 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0526 PM     HAIL             7 N HIGHLAND            43.15N 90.38W
06/08/2011  M0.75 INCH       IOWA               WI   TRAINED SPOTTER
            THREE QUARTER INCH HAIL FALLING AT TIME OF REPORT...AND
            GETTING LARGER.

0600 PM     HAIL             HIGHLAND                43.05N 90.38W
06/08/2011  M0.75 INCH       IOWA               WI   LAW ENFORCEMENT

            HEAVY RAIN ALSO FALLING

0612 PM     HAIL             HIGHLAND                43.05N 90.38W
06/08/2011  M1.00 INCH       IOWA               WI   LAW ENFORCEMENT

            AS RAIN TAPERED OFF...HAIL INCREASED IN SIZE.

0614 PM     HAIL             7 N HIGHLAND            43.15N 90.38W
06/08/2011  M1.75 INCH       IOWA               WI   TRAINED SPOTTER

0622 PM     HAIL             7 N HIGHLAND            43.15N 90.38W
06/08/2011  M1.75 INCH       IOWA               WI   TRAINED SPOTTER

            GOLF BALL SIZE HAIL STILL FALLING.

0626 PM     FUNNEL CLOUD     1 NNE DODGEVILLE        42.98N 90.12W
06/08/2011                   IOWA               WI   STORM CHASER

0655 PM     HAIL             COBB                    42.97N 90.33W
06/08/2011  M0.25 INCH       IOWA               WI   FIRE DEPT/RESCUE

0714 PM     HAIL             BARNEVELD               43.01N 89.90W
06/08/2011  M0.75 INCH       IOWA               WI   TRAINED SPOTTER

0719 PM     TSTM WND GST     DALTON                  43.66N 89.21W
06/08/2011  M70.00 MPH       GREEN LAKE         WI   EMERGENCY MNGR

            PEA SIZE HAIL ALSO FALLING.

0720 PM     HAIL             MOUNT HOREB             43.01N 89.73W
06/08/2011  E0.50 INCH       DANE               WI   TRAINED SPOTTER
            DIME SIZE HAIL. ESTIMATED 70 MPH WIND GUST...BASED ON
            OBJECTS BLOWN AROUND.

0723 PM     HAIL             MARQUETTE               43.75N 89.14W
06/08/2011  M1.00 INCH       GREEN LAKE         WI   EMERGENCY MNGR

            QUARTER SIZE HAIL IN THE VILLAGE OF MARQUETTE.

0726 PM     TSTM WND GST     KINGSTON                43.70N 89.13W
06/08/2011  M70.00 MPH       GREEN LAKE         WI   EMERGENCY MNGR

            SUSTAINED 70 MPH WIND MEASURED AT FIRE STATION.

0737 PM     TSTM WND GST     MARKESAN                43.71N 88.99W
06/08/2011  M52.00 MPH       GREEN LAKE         WI   EMERGENCY MNGR

0737 PM     TSTM WND GST     GREEN LAKE              43.84N 88.96W
06/08/2011  M70.00 MPH       GREEN LAKE         WI   EMERGENCY MNGR

0740 PM     TSTM WND DMG     4 SW MINERAL POINT      42.82N 90.24W
06/08/2011                   IOWA               WI   PUBLIC

            TWO 60 FOOT TREES BLOWN OVER. LIMBS BLOWN 30 TO 40 FEET.
            THIS DAMAGE REPORTED AT A LOCATION ALONG HIGHWAY 151 AT
            THE IOWA LAFAYETTE COUNTY LINE.

0740 PM     FUNNEL CLOUD     SW MADISON              43.08N 89.38W
06/08/2011                   DANE               WI   LAW ENFORCEMENT

0740 PM     TSTM WND DMG     2 E PAOLI               42.93N 89.48W
06/08/2011                   DANE               WI   TRAINED SPOTTER
            10 INCH DIAMETER TREE DOWN ACROSS A ROAD.

0746 PM     HAIL             3 N HARTFORD            43.37N 88.39W
06/08/2011  M1.00 INCH       WASHINGTON         WI   TRAINED SPOTTER

0750 PM     TSTM WND DMG     REWEY                   42.84N 90.40W
06/08/2011                   IOWA               WI   LAW ENFORCEMENT

            UTILITY POLES DOWN.
0750 PM     HAIL             3 NE MCFARLAND          43.05N 89.25W
06/08/2011  M1.75 INCH       DANE               WI   LAW ENFORCEMENT

           AT INTERSECTION OF HIGHWAY 18 AND HIGHWAY AB.

0751 PM     FUNNEL CLOUD     5 S MADISON             43.01N 89.38W
06/08/2011                   DANE               WI   AMATEUR RADIO
            ROTATING WALL CLOUD WITH A BRIEF FUNNEL.

0754 PM     TSTM WND GST     BELLEVILLE              42.86N 89.54W
06/08/2011  E80.00 MPH       DANE               WI   TRAINED SPOTTER

            HORIZONTAL RAIN AND HAIL.

0755 PM     HAIL             1 E VERONA              42.99N 89.52W
06/08/2011  M1.75 INCH       DANE               WI   LAW ENFORCEMENT

0755 PM     TSTM WND GST     MCFARLAND               43.02N 89.29W
06/08/2011  M70.00 MPH       DANE               WI   TRAINED SPOTTER

0755 PM     HAIL             MADISON                 43.08N 89.38W
06/08/2011  M0.50 INCH       DANE               WI   TRAINED SPOTTER

0756 PM     HAIL             SW MADISON              43.08N 89.38W
06/08/2011  M0.50 INCH       DANE               WI   TRAINED SPOTTER

0756 PM     HAIL             SHOREWOOD HILLS         43.08N 89.45W
06/08/2011  M0.88 INCH       DANE               WI   TRAINED SPOTTER


0759 PM     FUNNEL CLOUD     MCFARLAND               43.02N 89.29W
06/08/2011                   DANE               WI   LAW ENFORCEMENT

0800 PM     HAIL             MADISON                 43.08N 89.38W
06/08/2011  M1.50 INCH       DANE               WI   BROADCAST MEDIA
            AT UW MADISON.

0800 PM     HAIL             MADISON                 43.08N 89.38W
06/08/2011  M1.00 INCH       DANE               WI   TRAINED SPOTTER

0808 PM     TSTM WND GST     SE EVANSVILLE           42.78N 89.30W
06/08/2011  M59.00 MPH       ROCK               WI   AMATEUR RADIO

0810 PM     TSTM WND GST     2 S BRODHEAD            42.59N 89.38W
06/08/2011  M51.00 MPH       GREEN              WI   TRAINED SPOTTER

0816 PM     HAIL             FOX LAKE                43.57N 88.91W
06/08/2011  M0.88 INCH       DODGE              WI   TRAINED SPOTTER

0817 PM     TSTM WND DMG     2 WSW SUN PRAIRIE       43.17N 89.27W
06/08/2011                   DANE               WI   TRAINED SPOTTER

            MULTIPLE SMALL ALUMINUM GROUND-MOUNTED FLAG POLES BLOWN
            DOWN.

0819 PM     TSTM WND GST     JANESVILLE AIRPORT      42.62N 89.04W
06/08/2011  M56.00 MPH       ROCK               WI   AWOS

0822 PM     TSTM WND DMG     SE EVANSVILLE           42.78N 89.30W
06/08/2011                   ROCK               WI   TRAINED SPOTTER
            17 AND 24 INCH DIAMETER TREES DOWN.

0825 PM     TSTM WND GST     SUN PRAIRIE             43.18N 89.23W
06/08/2011  M70.00 MPH       DANE               WI   TRAINED SPOTTER

0825 PM     TSTM WND GST     EVANSVILLE              42.78N 89.30W
06/08/2011  M70.00 MPH       ROCK               WI   TRAINED SPOTTER

0830 PM     TSTM WND GST     3 WNW JEFFERSON         43.02N 88.86W
06/08/2011  E65.00 MPH       JEFFERSON          WI   AMATEUR RADIO

0830 PM     TSTM WND GST     2 N CAMBRIDGE           43.04N 89.02W
06/08/2011  E70.00 MPH       DANE               WI   AMATEUR RADIO

0835 PM     TSTM WND DMG     2 W DELAVAN             42.63N 88.67W
06/08/2011                   WALWORTH           WI   AMATEUR RADIO
            ROOF DAMAGE TO BUILDINGS.

0845 PM     TSTM WND GST     NWS SULLIvAN/MILWAUKEE  42.97N 88.55W
06/08/2011  E50.00 MPH       JEFFERSON          WI   OFFICIAL NWS OBS
            POWER FAILURE WITH WIND MEASURING EQUIPMENT.

0850 PM     TSTM WND GST     3 SE EAGLE              42.85N 88.43W
06/08/2011  M57.00 MPH       WAUKESHA           WI   TRAINED SPOTTER

0854 PM     TSTM WND GST     LAKE GENEVA             42.59N 88.43W
06/08/2011  M62.00 MPH       WALWORTH           WI   MESONET

            LKGEN

0856 PM     TSTM WND DMG     2 N DARIEN              42.63N 88.71W
06/08/2011                   WALWORTH           WI   AMATEUR RADIO

            LARGE TREES 2 FEET IN DIAMETER HAVE BEEN UPROOTED.

0857 PM     TSTM WND GST     NWS SULLIVAN/MILWAUKEE  42.97N 88.55W
06/08/2011  E55.00 MPH       JEFFERSON          WI   OFFICIAL NWS OBS

            SUSTAINED 30 MPH WITH GUSTS TO 55 MPH.

0901 PM     HAIL             1 NE OCONOMOWOC         43.12N 88.49W
06/08/2011  M0.25 INCH       WAUKESHA           WI   NWS EMPLOYEE

0903 PM     TSTM WND GST     5 NE BELOIT             42.57N 88.95W
06/08/2011  E80.00 MPH       ROCK               WI   TRAINED SPOTTER

0910 PM     TSTM WND DMG     1 ENE MUSKEGO           42.90N 88.10W
06/08/2011                   WAUKESHA           WI   TRAINED SPOTTER
            SMALL PIECE OF ALUMINUM SIDING BLOWN OFF HOUSE.

0911 PM     HAIL             2 SE WAUKESHA           42.99N 88.21W
06/08/2011  M0.50 INCH       WAUKESHA           WI   TRAINED SPOTTER

0914 PM     TSTM WND GST     NWS SULLIVAN/MILWAUKEE  42.97N 88.55W
06/08/2011  E60.00 MPH       JEFFERSON          WI   OFFICIAL NWS OBS

0920 PM     HAIL             2 SW WEST ALLIS         42.99N 88.06W
06/08/2011  M0.88 INCH       MILWAUKEE          WI   TRAINED SPOTTER
            97TH ST BETWEEN OKLAHOMA AVE AND BELOIT RD

0920 PM     TSTM WND GST     MILWAUKEE               43.03N 87.92W
06/08/2011  E55.00 MPH       MILWAUKEE          WI   TRAINED SPOTTER
            AT HIGHWAY 41 AND WASHINGTON BLVD

0923 PM     HAIL             WEST ALLIS              43.01N 88.03W
06/08/2011  M1.00 INCH       MILWAUKEE          WI   AMATEUR RADIO

0925 PM     TSTM WND GST     RACINE                  42.73N 87.78W

06/08/2011  M52.00 MPH       RACINE             WI   MESONET
            RCPNS

0925 PM     TSTM WND GST     2 W MILWAUKEE INTERNATI 42.94N 87.93W
06/08/2011  E60.00 MPH       MILWAUKEE          WI   AMATEUR RADIO

0930 PM     MARINE TSTM WIND MILWAUKEE LAKESHORE     43.05N 87.88W
06/08/2011  M51.00 MPH       MILWAUKEE          WI   MESONET
            44 KNOT PEAK WIND AT MCKINLEY MARINA OBSERVATION SITE.

0931 PM     TSTM WND GST     CUDAHY                  42.95N 87.86W
06/08/2011  M66.00 MPH       MILWAUKEE          WI   TRAINED SPOTTER

0933 PM     TSTM WND GST     RACINE                  42.73N 87.78W
06/08/2011  M60.00 MPH       RACINE             WI   AMATEUR RADIO

0940 PM     MARINE TSTM WIND PORT WASHINGTON LAKESHO 43.39N 87.87W
06/08/2011  M45.00 MPH       OZAUKEE            WI   MESONET

            39 KNOT PEAK WIND AT PORT WASHINGTON MARINA OBSERVATION
            SITE.

0940 PM     MARINE TSTM WIND KENOSHA LAKE SHORE      42.59N 87.81W
06/08/2011  M48.00 MPH       KENOSHA            WI   C-MAN STATION

            KNSW3. 42 KNOT GUST.

0945 PM     TSTM WND DMG     4 SW RACINE             42.69N 87.84W
06/08/2011                   RACINE             WI   AMATEUR RADIO

            TREES UPROOTED.

0945 PM     TSTM WND DMG     1 N GREENFIELD          42.98N 88.01W
06/08/2011                   MILWAUKEE          WI   TRAINED SPOTTER

            8 INCH DIAMETER TREE LIMB DOWN. 77TH AND OKLAHOMA.

&& 
 


Marc Kavinsky, Ashley Sears, Kapela

 



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