A strong storm system developed this past weekend to the southwest of the Great Lakes. This system brought intervals of rainfall and a surge of warm air to the area beginning Saturday morning, 10/13, and lasting into Monday morning,10/15. The heaviest rains came at times from Saturday morning through Sunday evening before diminishing to light rain showers and drizzle.
Click on the images below to enlarge
Saturday (Day) Saturday (Night) Sunday (Day)
The left loop above shows the initial wave of rainfall moving in early Saturday morning. There was a break in the rain around the middle portion of the day before another big area of rains moved in.
The middle loop above is from Saturday night. A line of numerous showers and a few storms affected areas south of I-96 in the evening hours. Another widespread area of rain then moved in late in the night from the southwest.
The right loop above is from the day on Sunday. The band of rain that moved in prior to dawn Sunday moved north through the area Sunday morning. Isolated storms then developed mid Sunday afternoon. Some of those storms exhibited rotation, however no tornadoes were reported. A widespread line of storms then moved from west to east early Sunday evening with wind gusts of 40-55 mph reported.
As expected, weekend rainfall totals of 1 to 2 inches were common across Southwest Lower Michigan. A few reports did eclipse the 3 inch mark however across West Central Lower Michigan. The graphic below is a radar estimatation of the areal extent of precipitation taking into account the entire weekend. Click on the image to enlarge.
The following is a weekend tally of precipitation from numerous stations across Southwest Lower Michigan.
Location Weekend Storm Total Rainfall (Inches)
Grand Rapids NWS 2.32
Big Rapids 2.10
Byron Center 2.03
Kent City 2.02
Paw Paw 1.95
South Haven 1.85
Battle Creek 1.84
West Olive 1.83
Mt Pleasant 1.80
Saint Johns 1.72
Grand Ledge 1.57
Grand Rapids Downtown 1.48
Eaton Rapids 1.21
The following graphic is a plot of all of the weekend rainfall reports from above. Click on image to enlarge.
A summary of significant weather associated with the storms Sunday evening
follows, including thunderstorm wind gusts, damage reports and hail reports.
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
905 PM EDT SUN OCT 14 2012
.TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON
.DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.
0316 PM HEAVY RAIN FERRY 43.58N 86.22W
10/14/2012 M3.60 INCH OCEANA MI PUBLIC
MEASURED RAINFALL SINCE 8 A.M. ON 10/13/12
0340 PM TSTM WND DMG SUNFIELD 42.76N 84.99W
10/14/2012 EATON MI TRAINED SPOTTER
LARGE TREE LIMB BLOCKING WASHINGTON ST NEAR INTERSECTION
OF WASHINGTON AND 3RD. LIMB EST TO BE 12 INCHES IN
0428 PM TSTM WND GST 5 S HUDSONVILLE 42.80N 85.86W
10/14/2012 M45.00 MPH OTTAWA MI MESONET
WIND GUST MEASURED BY MESONET SITE
0445 PM HEAVY RAIN 2 W ADA 42.95N 85.53W
10/14/2012 M1.23 INCH KENT MI NWS EMPLOYEE
RAINFALL SINCE 5AM. OVERALL STORM TOTAL 2.19 INCHES
0523 PM TSTM WND GST 3 ENE MUSKEGON 43.23N 86.19W
10/14/2012 M46.00 MPH MUSKEGON MI AMATEUR RADIO
0531 PM HAIL 3 E FREMONT 43.47N 85.89W
10/14/2012 E0.25 INCH NEWAYGO MI PUBLIC
PEA SIZE HAIL OBSERVED BY THE PUBLIC
0541 PM HAIL BROOKLYN 42.11N 84.25W
10/14/2012 M0.25 INCH JACKSON MI TRAINED SPOTTER
0557 PM TSTM WND GST 5 SSW GRAND RAPIDS 42.90N 85.72W
10/14/2012 E55.00 MPH KENT MI PUBLIC
0617 PM TSTM WND GST GRAND RAPIDS 42.96N 85.67W
10/14/2012 M42.00 MPH KENT MI TRAINED SPOTTER
0637 PM HAIL MOUNT PLEASANT 43.60N 84.77W
10/14/2012 M0.25 INCH ISABELLA MI EMERGENCY MNGR
HAIL OCCURRED AT THE INTERSECTION OF M-20 AND U.S 27.
The following graphic is a plot of all of the wind gusts from above.
The gusts on the coast were post frontal and associated with the low.
The inland gusts were thunderstorm related. Click on image to enlarge.
The highest wind gusts behind the storms and cold frontal passage Sunday evening, occurred along the Lake Michigan shoreline. The following are the highest gusts at selected sites.
Big Sable Point 1020pm 48mph
Muskegon GLERL site 1015pm 48mph
Holland Pier 1000pm 44mph
South Haven GLERL site 1015pm 46mph
The highest waves reported in the nearshore area from last night occurred after the front went through during the evening and overnight. The nearshore buoys at Bridgman, Holland, and Ludington all reported wave heights in the 10-12 foot range near the peak of the winds.