A line of strong to severe storms moved through the southern sections of Southwest Lower Michigan during the evening hours of June 18, resulting in numerous reports of isolated downed trees. Most of those reports were south of Interstate 96 and west of Interstate 69.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GRR wrote it up.
A line of strong to severe storms moved through the southern sections of Southwest Lower Michigan during the evening hours of June 18, resulting in numerous reports of isolated downed trees. Most of those reports were south of Interstate 96 and west of Interstate 69. There was an isolated report of hail over an inch in diameter near Concord in Jackson County. Some cars in the area had some pitting from the hail. The storms were fast moving and were accompanied by frequent cloud to ground lightning. There were widespread reports of power outages in the area.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Rapids, MI wrote its last area forecast discussion before the first event at Jun 18, 3:00 PM EST, 3 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND RAPIDS MI 400 PM EDT FRI JUN 18 2010 LATEST UPDATE...ALL BUT AVIATION... .SYNOPSIS...(400 PM EDT FRI JUN 18 2010) SHOWERS AND THUNDERSTORMS...SOME POSSIBLY SEVERE...WILL MOVE THROUGH THE AREA TONIGHT AHEAD OF A COLD FRONT. AFTER THE FRONT PASSES THROUGH EARLY SATURDAY...DRIER CONDITIONS AND MORE SEASONAL TEMPERATURES ARE EXPECTED FOR THE REST OF THE WEEKEND. THE FOLLOWING WORK WEEK WILL BE CHARACTERIZED BY HUMID CONDITIONS...SOMEWHAT ABOVE NORMAL TEMPERATURES...AND CHANCES FOR THUNDERSTORMS EACH DAY. && .SHORT TERM...(400 PM EDT FRI JUN 18 2010) (TONIGHT THROUGH SATURDAY) MAIN CONCERN IS TIMING...PLACEMENT...AND STRENGTH OF THUNDERSTORMS TONIGHT. RADAR AND SATELLITE SHOW A FORWARD PROPAGATING MCS RACING E ACROSS NRN IL AT THIS TIME. LATEST RUC SOUNDINGS SHOW A GREATER SURGE OF BOUNDARY LAYER MOISTURE S OF I-96 LATE THIS AFTERNOON AND EARLY EVENING. CURRENT MOTION SUGGESTS THE MCS WILL AFFECT THE SW CWFA AROUND 6 PM. IT IS SOMEWHAT UNCERTAIN IF THE MCS WILL BE WEAKENED WHILE CROSSING LAKE MICHIGAN. THE MCS APPEARS TO BE DRIVEN BY A MODERATE JET STREAK MOVING NE TOWARDS THE GREAT LAKES...WHICH SUGGESTS IT WILL REMAIN ORGANIZED. WOULD NOT BE SURPRISED TO SEE A SEVERE THUNDERSTORM WATCH ISSUED FOR THE MENTIONED AREA. ANOTHER SURGE OF STORMS WILL OCCUR AHEAD OF THE FRONT MORE IN THE MIDNIGHT TIMEFRAME. WE ARE SKEPTICAL OF THE HIGHLY KINEMATIC GFS SOLUTION DUE TO THE LARGE AMOUNT OF GRID SCALE PRECIPITATION / LOW LEVEL PV GENERATION OVERNIGHT...WHICH IN TURN LIKELY OVER-STRENGTHENS THE DOWNSTREAM LOW LEVEL JET. TEND TO FAVOR THE NAM...WHICH HAS LESS IMPRESSIVE SHEAR PROFILES. HOWEVER...THE ALREADY IMPRESSIVE INSTABILITY ALONE JUSTIFIES A CONTINUED MENTION OF SEVERE. EXPECT CONVECTION TO WIND DOWN AROUND SUNRISE SATURDAY AS THE FRONT SWEEPS THROUGH THE AREA. && .LONG TERM...(400 PM EDT FRI JUN 18 2010) (SATURDAY NIGHT THROUGH FRIDAY) A HIGH PRESSURE RIDGE WILL BUILD IN AND PRODUCE FAIR WX SATURDAY NIGHT THROUGH SUNDAY NIGHT. THE SFC RIDGE AXIS WILL SHIFT EAST WITH A LOW PRESSURE SYSTEM OVER THE PLAINS STATES BY MONDAY. THIS WILL RESULT IN SOUTHERLY RETURN FLOW AND INCREASING HEAT AND HUMIDITY OVER OUR AREA MONDAY THROUGH TUESDAY NIGHT. THE INCREASING INSTABILITY WILL RESULT IN POTENTIAL FOR TSTORMS MONDAY THROUGH TUESDAY AND PERHAPS LINGERING INTO WEDNESDAY UNTIL A COLD FRONT COMES THROUGH. DRY WX WITH SEASONABLE TEMPS IS EXPECTED FOR THURSDAY AND FRIDAY AS HIGH PRESSURE BUILDS IN. && .AVIATION...(145 PM EDT FRI JUN 18 2010) EXPECT A LESS THAN 20 PERCENT PROBABILITY FOR THUNDERSTORMS OVER SW LOWER MI THROUGH 00Z...BUT ANY STORMS THAT DEVELOP COULD BE SEVERE WITH GUSTS GREATER THAN 50KT. THE LIKELIHOOD OF A TERMINAL BEING AFFECTED IS VERY LOW. IF STORMS WERE TO DEVELOP EARLY...THEY WOULD MOST LIKELY BE OVER FAR SW LOWER MI CLOSE TO AZO. EXPECT A BETTER COVERAGE OF THUNDERSTORMS APPROACHING FROM THE WEST AFTER 04-05Z AHEAD OF A COLD FRONT. LATEST TAFS CARRY ONLY CB FOR THIS TIME FRAME...BUT THERE IS A GOOD CHANCE THAT MOST TAF SITES WILL SEE AROUND AN HOUR OF TSRA OVERNIGHT. THERE IS A GOOD CHANCE FOR THUNDERSTORM WIND GUSTS GREATER THAN 40 KNOTS...MOST LIKELY OUT OF THE W-NW...AND AT LEAST A SLIGHT CHANCE FOR GUSTS GREATER THAN 50 KTS. ALTHOUGH NOT MENTIONED IN THE TAFS...EXPECT VFR CIGS AND VSBYS AFTER 12Z FOR ALL TAF SITES. && .MARINE...(400 PM EDT FRI JUN 18 2010) NO HAZARDS ARE ANTICIPATED. ONE CONCERN...BESIDES STRONG TO SEVERE CONVECTION...IS FOG DUE TO HIGH DEWPOINTS STREAMING OVER THE COOL WATERS. WILL MONITOR THIS IF WINDS ARE ABLE TO DECOUPLE IN SPITE OF AN INCREASING PRESSURE GRADIENT. && .HYDROLOGY...(421 PM EDT FRI JUN 18 2010) THERE WILL NOT BE ANY LOWER OR UPPER JET TO FOCUS AN AREA OF HEAVY PCPN WITH THIS APPROACHING SYSTEM. GENERALLY RIVER BASIN AVERAGE QPF WILL BE AROUND A QUARTER. HOWEVER LOCALLY HEAVY AMOUNTS WILL OCCUR WITH PRECIPTABLE WATER VALUES AROUND 1.75 INCHES. GIVEN THE MOIST GROUNDS ALREADY IN PLACE...SOME URBAN AND SMALL STREAM FLOODING WILL BE POSSIBLE TODAY AND TONIGHT. && .GRR WATCHES/WARNINGS/ADVISORIES... MI....NONE. LM....NONE. && SYNOPSIS: TJT SHORT TERM: TJT LONG TERM: LAURENS AVIATION: TJT MARINE: TJT HYDROLOGY: JK
HAZARDOUS WEATHER OUTLOOK...CORRECTED SPOTTER INFO SECTION NATIONAL WEATHER SERVICE GRAND RAPIDS MI 445 PM EDT FRI JUN 18 2010 LMZ844>849-MIZ037>040-043>046-050>052-056>059-064>067-071>074-191000- ST JOSEPH TO SOUTH HAVEN MI-SOUTH HAVEN TO HOLLAND MI- HOLLAND TO GRAND HAVEN MI-GRAND HAVEN TO WHITEHALL MI- WHITEHALL TO PENTWATER MI-PENTWATER TO MANISTEE MI-MASON-LAKE- OSCEOLA-CLARE-OCEANA-NEWAYGO-MECOSTA-ISABELLA-MUSKEGON-MONTCALM- GRATIOT-OTTAWA-KENT-IONIA-CLINTON-ALLEGAN-BARRY-EATON-INGHAM- VAN BUREN-KALAMAZOO-CALHOUN-JACKSON- 445 PM EDT FRI JUN 18 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST LOWER MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT SEVERE THUNDERSTORM WATCH NUMBER 0344 IS IN EFFECT UNTIL MIDNIGHT FOR AREAS SOUTH OF HIGHWAY 10. DAMAGING WINDS ARE THE MAIN THREAT. STORM MOTION WILL BE TO THE EAST AROUND 45 MPH. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORMS ARE POSSIBLE MUCH OF NEXT WEEK WITH THE HIGHEST CHANCES ON MONDAY AND AGAIN ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS REQUIRED THIS EVENING FOR ALL OF SOUTHWEST LOWER MICHIGAN. SKYWARN LIKELY WILL NEED TO CONTINUE UNTIL AFTER MIDNIGHT AS ANOTHER ROUND OF STORMS MOVE EAST ACROSS THE AREA. TJT
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
650 PM EDT FRI JUN 18 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0648 PM TSTM WND GST 1 WNW SAUGATUCK 42.66N 86.22W
06/18/2010 E70 MPH ALLEGAN MI TRAINED SPOTTER
&&
TJTThe Grand Rapids radar (KGRR), 80 km away, was scanning. The volume nearest the first event began at 22:59 UTC.
3 thunderstorm wind, 1 hail. Local standard time, as filed.
Three large healthy trees were blown down three miles south southwest of Kendall. Power outages and minor wind damage were reported in Bangor.
Law enforcement reported that a tree and many power lines were blown down one mile north northeast of Plainwell.
Trained spotters in Kalamazoo reported that estimated wind gusts up to 65 mph brought down power lines three miles west southwest of Kalamazoo. A measured wind gust of 54 mph was recorded at the Kalamazoo airport.
A spotter one mile west northwest of Concord reported one and three quarters inch diameter hail. Several trees and large limbs were blown down in and near Jackson. A 47 mph wind gust was measured at the Jackson airport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2010Every state in 2010This day in weather historyWarnings in Michigan, June 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 235735, 235739, 235741, 235749.