Strong Storms Take Down Trees, Power Lines

Numerous thunderstorms moved into Southwest Lower Michigan during the early afternoon hours on August 20.  Advisories and warnings were put out for the storms which ended up producing winds in the 40 to 60 mph range.  These winds took down some trees and also cut power to nearly 30,000 residents across West Michigan.  As the storms moved into Southeast Lower Michigan, additional reports of wind damage were received by the Detroit NWS office.  Wind gusts continued to reach the 40 to 60 mph range as the storms moved to the eastern corner of the state.

 

Below is a radial velocity image of the storm as it approached downtown Grand Rapids, where a 55 mph wind gust was clocked at the GVSU downtown campus at 1:19pm.  The radar estimated winds in the 55 to 60 mph range as it approached the Grand Rapids area (winds are listed in knots on the image):

 

 

Now the base reflectivity image for the same time:

 

 

Some heavy rain reports were also received; however, the duration of rain was not long enough to cause significant flooding in spite of ponding on roads underneath the heaviest storms.  Below is a list of the storm reports issued:

 

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
452 PM EDT SAT AUG 20 2011

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

1215 PM HEAVY RAIN 3 S GRAND HAVEN 43.02N 86.22W
08/20/2011 M1.23 INCH OTTAWA MI NWS EMPLOYEE

ALSO WIND GUST TO 35 MPH.

1225 PM HAIL MORLEY 43.49N 85.45W
08/20/2011 E0.70 INCH MECOSTA MI TRAINED SPOTTER

1255 PM TSTM WND GST SOUTH HAVEN 42.40N 86.28W
08/20/2011 M49.00 MPH VAN BUREN MI BROADCAST MEDIA

MEASURED AT SOUTH HAVEN GLERL. CORRECTED FOR TIME.

0117 PM TSTM WND GST 4 NNW GRAND RAPIDS 43.02N 85.68W
08/20/2011 M32.00 MPH KENT MI BROADCAST MEDIA

WZZM TV.

0119 PM TSTM WND GST GRAND RAPIDS 42.96N 85.67W
08/20/2011 M55.00 MPH KENT MI BROADCAST MEDIA

MEASURED AT DOWNTOWN GVSU CAMPUS.

0123 PM TSTM WND GST EAST GRAND RAPIDS 42.94N 85.61W
08/20/2011 M42.00 MPH KENT MI BROADCAST MEDIA

MEASURED AT EAST GRAND RAPIDS COMMUNITY CENTER.

0125 PM FLOOD COOPERSVILLE 43.06N 85.95W
08/20/2011 OTTAWA MI TRAINED SPOTTER

STREET FLOODING AT INTERSECTION OF EAST AND RANDAL. WATER
6 INCHES DEEP.

0125 PM TSTM WND GST GRAND RAPIDS 42.96N 85.67W
08/20/2011 M45.00 MPH KENT MI BROADCAST MEDIA

MEASURED AT WOOD TV 8.

0126 PM TSTM WND GST EAST GRAND RAPIDS 42.94N 85.61W
08/20/2011 M42.00 MPH KENT MI CO-OP OBSERVER

0130 PM HEAVY RAIN 1 E HOLLAND 42.78N 86.09W
08/20/2011 M0.57 INCH OTTAWA MI TRAINED SPOTTER

1 HOUR RAINFALL ENDING AT 130 PM. WIND GUST TO 32 MPH.

0140 PM TSTM WND DMG 2 SSE GRATTAN TWP 43.05N 85.37W
08/20/2011 KENT MI AMATEUR RADIO

UNHEALTHY 3 FOOT DIAMETER TREE IS DOWN AND BLOCKING THE
BYRNE RD BETWEEN 5 MILE AND 6 MILE. TIME IS ESTIMATED.

0142 PM TSTM WND GST 3 WSW CANNONSBURG 43.04N 85.52W
08/20/2011 E45.00 MPH KENT MI NWS EMPLOYEE

0148 PM TSTM WND DMG 3 ESE CANNONSBURG 43.03N 85.41W
08/20/2011 KENT MI AMATEUR RADIO

A TWO INCH DIAMETER AND HEALTHY 35 FOOT LONG 2 INCH
DIAMETER BRANCH IS BLOWN DOWN. TIME IS APPROXIMATE.

0159 PM HEAVY RAIN 2 S HOLLAND 42.75N 86.11W
08/20/2011 M0.42 INCH ALLEGAN MI ASOS

1 HOUR RAINFALL ENDING AT 153 PM.

0159 PM TSTM WND DMG GRAND RAPIDS 42.96N 85.67W
08/20/2011 KENT MI BROADCAST MEDIA

WIRES DOWN IN BURTON HEIGHTS DUE TO WIND.

0200 PM TSTM WND DMG LOWELL 42.93N 85.34W
08/20/2011 KENT MI AMATEUR RADIO

35 FOOT...2 INCH DIAMETER HEALTHY BRANCH DOWN.

0201 PM TSTM WND GST BELLEVUE 42.44N 85.02W
08/20/2011 E60.00 MPH EATON MI TRAINED SPOTTER

SPOTTER ESTIMATED WIND GUSTS IN THE 50 TO 60 MPH RANGE.
SOME SMALL BRANCHES HAVE COME DOWN.

0203 PM TSTM WND DMG GRAND RAPIDS 42.96N 85.67W
08/20/2011 KENT MI BROADCAST MEDIA

TREE DOWN ON POWER AND CABLE LINES ON SWEET STREET NE.

0208 PM HEAVY RAIN ALLENDALE 42.97N 85.95W
08/20/2011 M0.56 INCH OTTAWA MI COCORAHS

2 HOUR RAINFALL ENDING AT 2 PM.

0220 PM HEAVY RAIN 1 SSE ORLEANS 43.05N 85.13W
08/20/2011 M0.76 INCH IONIA MI COCORAHS

20 MINUTE RAINFALL ENDING AT 215 PM.

0225 PM HEAVY RAIN SPARTA 43.16N 85.71W
08/20/2011 M1.59 INCH KENT MI MESONET

0225 PM HEAVY RAIN COMSTOCK PARK 43.04N 85.67W
08/20/2011 M0.80 INCH KENT MI TRAINED SPOTTER

30 MINUTE RAINFALL ENDING AT 2 PM.

0229 PM HEAVY RAIN 3 WSW CANNONSBURG 43.04N 85.52W
08/20/2011 M0.62 INCH KENT MI NWS EMPLOYEE

0230 PM TSTM WND GST 2 ESE ALMA 43.37N 84.62W
08/20/2011 E50.00 MPH GRATIOT MI TRAINED SPOTTER

A COUPLE OF 4 INCH DIAMETER DEAD BRANCHES DOWN.

0240 PM TSTM WND DMG PENNFIELD 42.37N 85.10W
08/20/2011 CALHOUN MI COUNTY OFFICIAL

NUMEROUS TREES DOWN...E AVE AND POORMAN RDS...LYNCH AND
PINE LAKE RDS... AND SMITH AND W DRIVE.

0245 PM TSTM WND DMG 3 NW ST. JOHNS 43.03N 84.60W
08/20/2011 CLINTON MI EMERGENCY MNGR

EMERGENCY MANAGER REPORTS A COUPLE PINE TREES HAVE BEEN
BLOWN DOWN ALONG WITH SOME POWER LINES. BRANCHES ARE DOWN
AS WELL.

0249 PM HEAVY RAIN 2 S BELDING 43.07N 85.23W
08/20/2011 E1.00 INCH IONIA MI AMATEUR RADIO

AT THE INTERSECTION OF OSTRUM AND JOHNSON ROADS.

0254 PM TSTM WND GST 1 NW BATTLE CREEK 42.33N 85.21W
08/20/2011 M43.00 MPH CALHOUN MI ASOS

0315 PM TSTM WND GST 2 NE MARSHALL 42.29N 84.94W
08/20/2011 E50.00 MPH CALHOUN MI FIRE DEPT/RESCUE

WIND GUSTS ESTIMATED TO BE AT LEAST 50 MPH. REPORT IS
TIME AND LOCATION ESTIMATED.

0322 PM TSTM WND GST 1 SSE MARSHALL 42.26N 84.96W
08/20/2011 M45.00 MPH CALHOUN MI AWOS

0326 PM TSTM WND GST ST. JOHNS 43.00N 84.56W
08/20/2011 E50.00 MPH CLINTON MI TRAINED SPOTTER

SOME POWER LINES DOWN IN THE CITY OF ST. JOHNS.

0330 PM HEAVY RAIN 1 NW BATTLE CREEK 42.33N 85.21W
08/20/2011 M0.56 INCH CALHOUN MI ASOS

RAINFALL FROM 3 PM THROUGH 325 PM.

0356 PM HEAVY RAIN SUNFIELD 42.76N 84.99W
08/20/2011 M0.70 INCH EATON MI TRAINED SPOTTER

RAINFALL FROM 2 PM THROUGH 340 PM.

0401 PM HEAVY RAIN HESPERIA 43.57N 86.04W
08/20/2011 M0.50 INCH NEWAYGO MI COUNTY OFFICIAL

STORM TOTAL RAINFALL.

0424 PM HEAVY RAIN 5 N PORTLAND 42.94N 84.90W
08/20/2011 M1.06 INCH IONIA MI AMATEUR RADIO

STORM TOTAL PRECIPITATION.




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