Summary of July 30-31, 2012 Severe Storms and Rain

Scattered severe weather occurred over parts of south-central and southeast Wisconsin during the overnight hours of July 30th.  The severe weather consisted of powerful downburst, straight-line winds and large hail.  Some large trees were uprooted and/or large tree branches knocked out of trees.  Some power lines were probably snapped or were arcing.  A couple roads were blocked until authorities removed tree debris.  Maximum wind gusts were on the order of 58 to 65 mph and hail stone diameters were 1 inch.

Beneficial rains fell, but as usual amounts varied from a few hundredths to over an inch.  Very little if any rain fell west of Dane County.  However, 2 to 2.5 inches may have fallen near the intersection of CTH J and H in north central Sheboygan County, based on doppler radar estimates.  Here at the NWS office southeast of Sullivan in east-central Jefferson County we picked up 0.38 inch.  We'll take it!

The storms and beneficial rains were associated with a weak cold front that moved southeast across Wisconsin. Below is a 4-panel display showing what the storms looked like on radar at 1050 PM, 1219 AM, and 110 AM.  In the upper left is a surface weather map showing the cold front and other surface features at 1200 AM.   Click on image for larger version

 JUly 30-31 4-panel

Below is a graphic showing estimated rainfall amounts based on Dual Pol technology.  Click on image for larger version.

rainfall July 30-31 2012 

Below are some severe weather reports.  If you had tree damage or large hail last night (other than what is below), feel free to send your information to rusty.kapela@noaa.gov.

NWUS53 KMKX 310940
LSRMKX

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
440 AM CDT TUE JUL 31 2012

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

1140 PM     HAIL             1 NW SUN PRAIRIE        43.19N 89.25W
07/30/2012  M1.00 INCH       DANE               WI   TRAINED SPOTTER

1140 PM     HAIL             WEST BEND               43.42N 88.18W
07/30/2012  M0.50 INCH       WASHINGTON         WI   TRAINED SPOTTER

            LASTED APPROXIMATELY THREE MINUTES.

1143 PM     HAIL             SUN PRAIRIE             43.18N 89.23W
07/30/2012  M0.88 INCH       DANE               WI   TRAINED SPOTTER

            VEHICLE DAMAGE REPORTED WITH NICKEL SIZE HAIL.

1201 AM     HAIL             JACKSON                 43.32N 88.16W
07/31/2012  M0.50 INCH       WASHINGTON         WI   TRAINED SPOTTER

            HEAVY RAIN...VISIBILITY LESS THAN A 1/4 MILE.

1237 AM     TSTM WND GST     PALMYRA                 42.88N 88.59W
07/31/2012  E50.00 MPH       JEFFERSON          WI   TRAINED SPOTTER

1242 AM     TSTM WND GST     PALMYRA                 42.88N 88.59W
07/31/2012  M57.00 MPH       JEFFERSON          WI   TRAINED SPOTTER

1247 AM     TSTM WND DMG     3 ENE LA GRANGE         42.82N 88.55W
07/31/2012                   WALWORTH           WI   911 CALL CENTER

            A COUPLE TREES DOWN IN THE AREA FROM 3 ENE LA GRANGE TO 5
            ENE OF LA GRANGE. ONE OF THE TREES BLOCKED A ROAD. TIME
            IS ESTIMATED BASED ON RADAR.

1250 AM     HAIL             2 E NORTH PRAIRIE       42.94N 88.36W
07/31/2012  M1.00 INCH       WAUKESHA           WI   TRAINED SPOTTER

1257 AM     TSTM WND DMG     6 SW MUSKEGO            42.83N 88.20W
07/31/2012                   RACINE             WI   911 CALL CENTER

            TREE DOWN AT BIG BEND ROAD AND N LAKE DRIVE. TIME
            ESTIMATED.

1257 AM     HAIL             5 S WAUKESHA            42.94N 88.24W
07/31/2012  M0.25 INCH       WAUKESHA           WI   TRAINED SPOTTER

0105 AM     TSTM WND DMG     5 NNW WATERFORD         42.83N 88.25W
07/31/2012                   RACINE             WI   911 CALL CENTER

            A COUPLE LARGE TREES DOWN IN THE CALDWELL AREA AND IN THE
            TICHIGAN AREA WEST AND NORTH OF TICHIGAN LAKE. TIME IS
            ESTIMATED BASED ON RADAR.

0105 AM     HAIL             4 WNW GREENDALE         42.96N 88.07W
07/31/2012  M0.50 INCH       MILWAUKEE          WI   LAW ENFORCEMENT

            ON HIGHWAY 43 NEAR 124TH ST. TIME ESTIMATED.

0140 AM     MARINE TSTM WIND 1 E DOWNTOWN KENOSHA    42.58N 87.80W
07/31/2012  M45.00 MPH       LMZ646             WI   C-MAN STATION

            KENOSHA MARINE OBSERVATION RECORDED A 39 KNOT MARINE
            THUNDERSTORM WIND GUST.

The storms generated damaging winds and dumped large hail in northeast Wisconsin.  For information, click here
.



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