Severe Thunderstorms in East-Central Wisconsin Friday Afternoon

Thunderstorms developed over northeast Wisconsin on the afternoon of Friday, August 14.  The storms strengthened as they pushed south.  Several storms merged together as they approached the Green Bay area, resulting in damaging wind gusts.  A measured wind gust of 62 mph occurred at Austin Straubel airport in Ashwaubenon. Numerous reports of wind damage were received from the west side of Green Bay, as well as in the Kaukauna and Chilton areas. Golf ball-sized hail was reported just northwest of Green Bay, in the Pulaski area.

Radar loop from early afternoon to early evening Friday August 14.  Click image for larger view.

Loop of radar velocity as the storms surged south across the Green Bay area.  Strong winds blowing south toward the radar (located at the red dot near the center of the imagery) initially appear as bright green radar returns over southern Oconto county.  The wind signature changes to bright red once the strong winds push south of the radar.  Click image for larger view.

Here is a preliminary listing of the storm reports received by the National Weather Service office in Green Bay.

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE GREEN BAY WI
1230 AM CDT SAT AUG 15 2015

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

0200 PM     TSTM WND GST     GILLS ROCK              45.28N 87.01W
08/14/2015  M39.00 MPH       DOOR               WI   OTHER FEDERAL

            REPORTED AT DEATHS DOOR

0237 PM     HAIL             RHINELANDER             45.63N 89.41W
08/14/2015  M0.25 INCH       ONEIDA             WI   TRAINED SPOTTER

0243 PM     HAIL             CALDRON FALLS RESERVOIR 45.35N 88.25W
08/14/2015  M0.25 INCH       MARINETTE          WI   CO-OP OBSERVER

0300 PM     TSTM WND GST     SISTER BAY              45.18N 87.11W
08/14/2015  M44.00 MPH       DOOR               WI   C-MAN STATION

0315 PM     HAIL             2 NW ELTON              45.17N 88.87W
08/14/2015  M0.88 INCH       LANGLADE           WI   TRAINED SPOTTER

0320 PM     HAIL             MARINETTE               45.09N 87.61W
08/14/2015  E1.00 INCH       MARINETTE          WI   PUBLIC

            QUARTER SIZE HAIL FELL IN MARINETTE.

0324 PM     HAIL             MARINETTE               45.09N 87.61W
08/14/2015  E0.50 INCH       MARINETTE          WI   TRAINED SPOTTER

            SLIGHTLY LARGER THAN 1/2 INCH

0336 PM     HAIL             8 N TOMAHAWK            45.58N 89.73W
08/14/2015  M0.50 INCH       ONEIDA             WI   TRAINED SPOTTER

            SLIGHTLY LARGER THAN 1/2 INCH

0345 PM     HAIL             3 W PESHTIGO            45.04N 87.81W
08/14/2015  E0.88 INCH       MARINETTE          WI   PUBLIC

            LOCATION OF REPORT IS ESTIMATED.

0347 PM     HAIL             OCONTO                  44.88N 87.88W
08/14/2015  E1.00 INCH       OCONTO             WI   PUBLIC

            QUARTER SIZE HAIL FELL IN OCONTO.

0415 PM     HAIL             SOBIESKI                44.71N 88.06W
08/14/2015  E1.75 INCH       OCONTO             WI   PUBLIC

            GOLF BALL SIZE HAIL FELL IN SOBIESKI.

0420 PM     HAIL             PULASKI                 44.66N 88.23W
08/14/2015  E1.75 INCH       BROWN              WI   PUBLIC

            GOLF BALL SIZE HAIL FELL IN PULASKI.

0435 PM     TSTM WND DMG     2 W GREEN BAY           44.51N 88.04W
08/14/2015                   BROWN              WI   NWS EMPLOYEE

            FEW LARGE TREES AND POWER LINES DOWN, CORNER OF WEST
            POINT ROAD AND PACKERLAND AVENUE.

0437 PM     TSTM WND DMG     2 W GREEN BAY           44.51N 88.04W
08/14/2015                   BROWN              WI   EMERGENCY MNGR

            A FEW LARGE TREES AND POWER LINES DOWN.

0437 PM     TSTM WND GST     3 SW GREEN BAY          44.48N 88.04W
08/14/2015  M62.00 MPH       BROWN              WI   ASOS

            62 MPH WIND GUST AT THE GRB ASOS.

0438 PM     TSTM WND GST     3 SW GREEN BAY          44.48N 88.04W
08/14/2015  M62.00 MPH       BROWN              WI   ASOS

            62 MPH WIND GUST REPORTED AT THE GRB ASOS.

0440 PM     TSTM WND DMG     DE PERE                 44.45N 88.05W
08/14/2015                   BROWN              WI   PUBLIC

            TREES DOWN.

0440 PM     TSTM WND DMG     FREEDOM                 44.38N 88.28W
08/14/2015                   OUTAGAMIE          WI   PUBLIC

            TREES DOWN.

0440 PM     TSTM WND DMG     BLACK CREEK             44.46N 88.44W
08/14/2015                   OUTAGAMIE          WI   PUBLIC

            TREES DOWN.

0445 PM     HAIL             10 N APPLETON           44.40N 88.40W
08/14/2015  M0.25 INCH       OUTAGAMIE          WI   STORM CHASER

            PEA-SIZE HAIL REPORTED AT THE INTERSECTION OF HIGHWAY 47
            AND COUNTY ROAD S.

0445 PM     TSTM WND DMG     SUAMICO                 44.63N 88.05W
08/14/2015                   BROWN              WI   PUBLIC

            SHINGLES TORN FROM ROOF. REPORT RECEIVED VIA SOCIAL
            MEDIA. TIME ESTIMATED.

0445 PM     TSTM WND DMG     GREEN BAY               44.51N 88.00W
08/14/2015                   BROWN              WI   EMERGENCY MNGR

            ADDITIONAL REPORTS OF TREES AND POWER LINES DOWN ON THE
            WEST SIDE OF GREEN BAY.

0500 PM     TSTM WND GST     LITTLE CHUTE            44.28N 88.32W
08/14/2015  E59.00 MPH       OUTAGAMIE          WI   MESONET

            MEASURED AT LITTLE CHUTE HIGH SCHOOL

0510 PM     TSTM WND DMG     KAUKAUNA                44.26N 88.26W
08/14/2015                   OUTAGAMIE          WI   PUBLIC

            EMERGENCY MANAGER RELAYED REPORTS OF TREES DOWN IN
            KAUKAUNA.

0519 PM     FLOOD            BLACK CREEK             44.46N 88.44W
08/14/2015                   OUTAGAMIE          WI   AMATEUR RADIO

            HEAVY RAIN IN BLACK CREEK CAUSED STREET FLOODING ON
            HIGHWAY 47 JUST EAST OF HIGHWAY 54. STANDING WATER WAS
            ABOUT 6 INCHES DEEP.

0527 PM     TSTM WND DMG     CHILTON                 44.03N 88.16W
08/14/2015                   CALUMET            WI   EMERGENCY MNGR

            TREES DOWN

0530 PM     TSTM WND DMG     KAUKAUNA                44.26N 88.26W
08/14/2015                   OUTAGAMIE          WI   AMATEUR RADIO

            LARGE TREES SNAPPED ABOUT 5 FEET ABOVE THE GROUND IN
            KAUKAUNA.

0530 PM     HAIL             2 S KAUKAUNA            44.23N 88.26W
08/14/2015  M0.50 INCH       CALUMET            WI   STORM CHASER

            ONE-HALF INCH HAIL REPORTED JUST SOUTH OF KAUKAUNA ON THE
            OUTAGAMIE/CALUMET COUNTY LINE.

0530 PM     TSTM WND DMG     KIMBERLY                44.27N 88.34W
08/14/2015                   OUTAGAMIE          WI   TRAINED SPOTTER

            TREES DOWN BLOCKING ROAD

0538 PM     TSTM WND GST     4 E KIEL                43.91N 87.95W
08/14/2015  E55.00 MPH       MANITOWOC          WI   TRAINED SPOTTER

0610 PM     HAIL             GREENVILLE              44.29N 88.53W
08/14/2015  M1.00 INCH       OUTAGAMIE          WI   TRAINED SPOTTER

            ONE INCH HAIL AT HIGHWAY 76 AND HIGHWAY 96.

0615 PM     HAIL             LARSEN                  44.18N 88.61W
08/14/2015  E1.00 INCH       WINNEBAGO          WI   TRAINED SPOTTER

            NICKEL TO QUARTER SIZE HAIL FELL IN CLAYTON TOWNSHIP.
            TIME IS APPROXIMATE.

0618 PM     HAIL             OSHKOSH                 44.01N 88.55W
08/14/2015  E0.50 INCH       WINNEBAGO          WI   PUBLIC

            DIME SIZE HAIL FELL IN OSHKOSH.

0622 PM     HAIL             4 ENE LARSEN            44.20N 88.54W
08/14/2015  E1.00 INCH       WINNEBAGO          WI   PUBLIC

            QUARTER SIZE HAIL AT HIGHWAY 76 AND CR-II. TIME IS
            APPROXIMATE.