Isolated Storm Produces Tennis Ball-Size Hail on June 5, 2019

Overview

Isolated thunderstorms developed along a lake breeze and surface trough in eastern Wisconsin during the late afternoon of June 5, 2019. One storm became severe and produced hail up to tennis ball-size around Stephensville in Outagamie County. Wind gusts over 40 mph were also reported.

Hail
Radar
Storm Reports

Hail

The atmosphere became moderately unstable as morning clouds dissipated. Wind shear was sufficient to produce rotating thunderstorms. One of those became a supercell and produced hail up to 2.5 inches in diameter.


Hail near Shiocton. Picture from Christopher Ashline.	Hail near Shiocton. Picture from @ZiggysTweeting.	Hail near Stephensville. Picture from Colton West.	Hail near Stephensville. Picture from CJ Montour.	Hail near Stephensville. Picture from Kelly Ashauer, courtesy WLUK-TV.

Radar

Images from NWS Green Bay radar (KGRB). Click any image for larger view.


Radar cross-section at 5:38 pm. Note the "bounded weak echo region" indicating a strong updraft with high reflectivity (very large hail) aloft.	Radar reflectivity (0.5 deg).	Radar reflectivity (8.0 deg). Note the large "hail spike" (technically known as a three-body scatter spike) around 5:30 pm.

Storm Reports

Preliminary list of storm reports.

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

0518 PM     HAIL             7 N SHIOCTON            44.53N 88.58W
06/05/2019  M0.75 INCH       OUTAGAMIE          WI   TRAINED SPOTTER

0524 PM     HAIL             3 N SHIOCTON            44.47N 88.58W
06/05/2019  M0.75 INCH       OUTAGAMIE          WI   TRAINED SPOTTER

0538 PM     HAIL             SHIOCTON                44.43N 88.58W
06/05/2019  M1.00 INCH       OUTAGAMIE          WI   PUBLIC

0541 PM     HAIL             2 N STEPHENSVILLE       44.39N 88.58W
06/05/2019  M1.00 INCH       OUTAGAMIE          WI   TRAINED SPOTTER

0553 PM     HAIL             2 S SHIOCTON            44.40N 88.58W
06/05/2019  M1.50 INCH       OUTAGAMIE          WI   PUBLIC

            FROM SOCIAL MEDIA

0553 PM     HAIL             STEPHENSVILLE           44.36N 88.58W
06/05/2019  E2.50 INCH       OUTAGAMIE          WI   PUBLIC

            DELAYED REPORT FROM SOCIAL MEDIA. TIME ESTIMATED BY
            RADAR.

0557 PM     HAIL             3 SE STEPHENSVILLE      44.33N 88.54W
06/05/2019  E2.50 INCH       OUTAGAMIE          WI   PUBLIC

            DELAYED REPORT FROM SOCIAL MEDIA. TIME ESTIMATED BY
            RADAR.

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