Strong thunderstorms with damaging winds and heavy rain are expected across portions of the Southeast. Thunderstorms may produce large hail across portions of Montana. Heavy rainfall could produce flash flooding across Iowa and vulnerable areas in Utah. Lowell will bring heavy rain, dangerous swells and rip currents to portions of Hawaii. Sweltering heat persists across the South-Central US. Read More >
Summary of Severe Weather on August 10
August 10, 2020 Derecho in Southwest Michigan
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Shelf cloud crossing the west side of Grandville |
Thunderstorms began in eastern Nebraska and Iowa, then raced through Wisconsin, Illinois, Indiana and Michigan. The storms produced a large swath of strong damaging winds, which ended in West Michigan. As the strong winds extended over a several hundred mile stretch, these storms were classified as a derecho. Numerous wind reports of 80 to 110 mph were received across much of Iowa and northern Illinois. The highest gust was 112 mph in Iowa.
Links to Other NWS stories on this storm:
SPC Unfiltered Reports for August 10th, 2020
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
345 AM EDT TUE AUG 11 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0448 AM TSTM WND GST 2 WSW GOBLES 42.35N 85.92W
08/10/2020 M30 MPH VAN BUREN MI MESONET
MESONET STATION EW1083 GOBLES.
0530 AM TSTM WND GST MACATAWA 42.77N 86.20W
08/10/2020 M31 MPH OTTAWA MI BUOY
BUOY STATION HLNM4 HOLLAND HARBOR.
0648 PM TSTM WND GST LAWTON 42.17N 85.85W
08/10/2020 E45 MPH VAN BUREN MI TRAINED SPOTTER
GUST FRONT OUT AHEAD OF RAIN WITH GUSTS
ESTIMATED 40 TO 45 MPH.
0652 PM TSTM WND DMG MATTAWAN 42.21N 85.79W
08/10/2020 VAN BUREN MI PUBLIC
SOME TREES DOWN.
0655 PM MARINE TSTM WIND 1 NNW SOUTH HAVEN 42.41N 86.28W
08/10/2020 M43 MPH VAN BUREN MI BUOY
0656 PM TSTM WND DMG 5 NW DECATUR 42.16N 86.04W
08/10/2020 VAN BUREN MI PUBLIC
TREES DOWN ALONG WESTERN TERRITORIAL ROAD.
0659 PM TSTM WND DMG GOBLES 42.36N 85.88W
08/10/2020 VAN BUREN MI PUBLIC
SOME TREES DOWN.
0719 PM TSTM WND DMG 1 N NORTH DORR 42.78N 85.76W
08/10/2020 KENT MI PUBLIC
SMALL SHED DAMAGED AND ISOLATED TREE DAMAGE.
0725 PM TSTM WND DMG PLAINWELL 42.44N 85.64W
08/10/2020 ALLEGAN MI TRAINED SPOTTER
8 INCH DIAMETER TREE DOWN ACROSS M89 IN
PLAINWELL.
0735 PM TSTM WND DMG 1 N SOUTH GULL LAKE 42.40N 85.40W
08/10/2020 KALAMAZOO MI PUBLIC
0615 PM TSTM WND GST ST JOSEPH PIER 42.12N 86.49W
08/10/2020 M57 MPH LMZ844 MI MESONET
MESONET STATION XSTJ ST. JOSEPH PIER.
0640 PM TSTM WND GST 1 W SOUTH HAVEN 42.40N 86.29W
08/10/2020 M45 MPH LMZ844 MI MESONET
MESONET STATION SVNM4 SOUTH HAVEN.
0642 PM TSTM WND GST 2 NNW SAUGATUCK 42.68N 86.22W
08/10/2020 M47 MPH LMZ845 MI MESONET
MESONET STATION XSTK SAUGATUCK PIER.
0706 PM TSTM WND GST MACATAWA 42.77N 86.20W
08/10/2020 M45 MPH OTTAWA MI MESONET
MESONET STATION HLNM4 HOLLAND HARBOR.
0713 PM TSTM WND GST 3 NE PORTAGE 42.23N 85.55W
08/10/2020 M47 MPH KALAMAZOO MI ASOS
ASOS STATION KAZO KZOO/BATTLE CREEK INTL
AIRPORT.
0715 PM TSTM WND GST 4 SSE SOUTH HAVEN 42.35N 86.25W
08/10/2020 M43 MPH VAN BUREN MI AWOS
AWOS STATION KLWA SOUTH HAVEN RGNL ARPT.
0739 PM TSTM WND GST 4 WNW ROOSEVELT PARK 43.22N 86.35W
08/10/2020 M48 MPH LMZ847 MI MESONET
MESONET STATION XMSK MUSKEGON NORTH
BREAKWATER LIGHT.
0740 PM TSTM WND GST 4 WNW ROOSEVELT PARK 43.23N 86.34W
08/10/2020 M46 MPH MUSKEGON MI MESONET
MESONET STATION MKGM4 3 WNW ROOSEVELT PARK.
0745 PM TSTM WND GST 2 SSW CASCADE 42.88N 85.52W
08/10/2020 M45 MPH KENT MI ASOS
ASOS STATION KGRR GERALD R FORD INTL.
0831 PM TSTM WND GST 3 ENE SANDSTONE 42.27N 84.47W
08/10/2020 M47 MPH JACKSON MI ASOS
ASOS STATION KJXN JACKSON COUNTY-REYNOLDS
FIELD AIRPORT.
Thank you to everyone who submitted damage reports, photos, and videos!
Heavy Rainfall
Along with the damaging winds, portions of Lower Michigan received heavy rainfall. The heaviest rainfall amounts were in Van Buren County and north of a line from Fremont to Alma. Gobles and Cloverville had the highest reported rainfall of 2.72 inches.
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Damage Pictures
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West of Decatur (Van Buren County) Photo courtesy of John Cathy Goodrich |
Leighton Township (Allegan County) Photo courtesy of Phillip Holscher |
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Grand Haven (Ottawa County) Photo courtesy of Kerri Bolitho Young |
Leighton Township (Allegan County) Photo courtesy of Phillip Holscher |
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Gull Lake (Kalamazoo County) Photo courtesy of Ken Kissinger |
Radar
Radar Reflectivity as Derecho Moves Into Southwest Michigan August 10th 2020
August 10 2020 Derecho Velocity Image Loop from Grand Rapids Radar
Marine
As the Derecho moved across Lake Michigan it caused a Meteotsunami. For more information follow this link.
Below are two images that show what happened as this line of storms moved across Lake Michigan. The rapid increase in pressure captured in red caused an increase of wave heights showed in the second image.
Below was a report from a NWS Employee who was at South Haven, MI.
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0640 PM SEICHE 1 WNW SOUTH HAVEN 42.40N 86.28W
08/10/2020 LMZ844 MI NWS EMPLOYEE
DELAYED REPORT. OBSERVED WATER RISE OF 1.5
FT AT SOUTH HAVEN.
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