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Overview

Scattered thunderstorms initially developed over Saginaw Bay and tracked through the Thumb region, becoming locally strong to severe before becoming a line of strong to severe thunderstorms as they tracked through the northern Detroit metro and I-69 corridor during the evening hours. These thunderstorms formed along and ahead of a cold front, with moist and and relatively unstable air out ahead of the front. The thunderstorms produced reports of wind damage along with reports of power outages in addition to heavy rainfall and numerous lightning strikes.


Radar Loop

 


Summary of Storm Reports

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
913 PM EDT TUE JUL 20 2021

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

0540 PM     TSTM WND DMG     ATTICA                  43.03N 83.16W
07/20/2021                   LAPEER             MI   911 CALL CENTER

            TREES AND WIRES REPORTED DOWN, MOST NUMEROUS IN ATTICA
            TOWNSHIP.

0623 PM     TSTM WND GST     OXFORD                  42.82N 83.25W
07/20/2021  E60.00 MPH       OAKLAND            MI   AMATEUR RADIO

            A TRAINED SPOTTER ESTIMATED 60 MPH WINDS AND REPORTED PEA
            SIZE HAIL.

0650 PM     TSTM WND DMG     AUBURN HILLS            42.67N 83.24W
07/20/2021                   OAKLAND            MI   LAW ENFORCEMENT

            TREES REPORTED DOWN IN AUBURN HILLS, AS WELL AS SEVERAL
            OTHER CITIES IN OAKLAND COUNTY.

0800 PM     TSTM WND DMG     4 NW CANTON             42.35N 83.53W
07/20/2021                   WAYNE              MI   TRAINED SPOTTER

            MULTIPLE TREES AND LARGE TREE LIMBS REPORTED DOWN.

0815 PM     TSTM WND DMG     CHELSEA                 42.31N 84.02W
07/20/2021                   WASHTENAW          MI   PUBLIC

            LARGE TREE LIMB REPORTED DOWN.

0827 PM     HAIL             1 SSW CHELSEA           42.29N 84.03W
07/20/2021  E0.75 INCH       WASHTENAW          MI   EMERGENCY MNGR