Overview
A cold front tracked across Southeast Michigan on October 7th, between 9 PM - 12 AM, producing fast-moving severe thunderstorms spanning numerous counties. The main threat with all the severe thunderstorms was damaging wind gusts, as strong winds aloft were brought to the surface by the storms, amplified by the forward speed of the storms themselves. Local storm reports consisted of downed trees and tree limbs, downed power lines, and building damage. Additionally, rotation seen on Doppler radar was responsible for two tornado warnings, for both Livingston and Lapeer Counties. A tornado has not been confirmed at this time, however, multiple accounts of downed trees were reported within the warned areas.
Local Storm Report & Warning Map
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| Map of Severe Thunderstorm Warnings (yellow), Tornado Warnings (red), Special Marine Warnings (purple) and associated wind gust and thunderstorm wind damage reports. |
Radar
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| Radar loop courtesy of Iowa Environmental Mesonet (IEM) |
Storm Reports
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1125 AM EDT SUN OCT 08 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1000 PM TSTM WND DMG 7 S FOWLERVILLE 42.56N 84.07W
10/07/2017 LIVINGSTON MI PUBLIC
TREES BLOCKING MUNSELL ROAD EAST OF ASTORIA DRIVE. SIDING
RIPPED OFF THE SOUTH SIDE OF HOME.
1006 PM TSTM WND DMG 1 NW HOWELL 42.62N 83.95W
10/07/2017 LIVINGSTON MI TRAINED SPOTTER
15 INCH TREE LIMBS DOWN WITH SEVERAL 3 TO 4 INCH LIMBS
DOWN AT BREWER ROAD AND M-59. REPORTED 57 MPH WIND GUST
WITH ANEMOMETER NEAR THIS LOCATION.
1008 PM TSTM WND DMG FLUSHING 43.06N 83.84W
10/07/2017 GENESEE MI PUBLIC
TREE DOWN ON HOUSE.
1010 PM TSTM WND DMG 1 N HOWELL 42.62N 83.94W
10/07/2017 LIVINGSTON MI TRAINED SPOTTER
MULTIPLE TREES DOWN ON HENDERSON ROAD NEAR BYRON ROAD.
1023 PM TSTM WND DMG FENTON 42.80N 83.71W
10/07/2017 GENESEE MI PUBLIC
LARGE TREE DOWN ON WHITE LAKE ROAD.
1036 PM TSTM WND DMG 2 SW TEMPERANCE 41.74N 83.60W
10/07/2017 MONROE MI LAW ENFORCEMENT
MONROE COUNTY CENTRAL DISPATCH REPORTED TREE DOWN AT
DOUGLAS RD AND STERNS RD.
1037 PM TSTM WND DMG 4 N DUNDEE 42.01N 83.67W
10/07/2017 MONROE MI LAW ENFORCEMENT
MONROE COUNTY CENTRAL DISPATCH REPORTED TREE DOWN AT ANN
ARBOR RD AND MILWAUKEE RD.
1037 PM TSTM WND DMG 3 WSW TEMPERANCE 41.76N 83.62W
10/07/2017 MONROE MI LAW ENFORCEMENT
MONROE COUNTY CENTRAL DISPATCH REPORTED TREE DOWN AT
WATERFORD AND DEAN RD.
1039 PM TSTM WND DMG 2 ESE DUNDEE 41.95N 83.62W
10/07/2017 MONROE MI LAW ENFORCEMENT
MONROE COUNTY CENTRAL DISPATCH REPORTED TREE DOWN AT
MEANWELL RD AND M-50.
1040 PM MARINE TSTM WIND 8 ESE AU GRES 44.00N 83.54W
10/07/2017 M48.00 MPH LHZ421 MI BUOY
OBSERVATION AT GRAVELLY SHOALS BUOY
1042 PM TSTM WND DMG 6 N TEMPERANCE 41.85N 83.57W
10/07/2017 MONROE MI LAW ENFORCEMENT
MONROE COUNTY CENTRAL DISPATCH REPORTED TREE DOWN AT TODD
RD AND LEWIS AVE.
1046 PM TSTM WND DMG CARO 43.49N 83.40W
10/07/2017 TUSCOLA MI LAW ENFORCEMENT
TUSCOLA COUNTY CENTRAL DISPATCH REPORTED THAT THERE ARE
NUMEROUS TREES AND POWER LINES DOWN THROUGHOUT THE
COUNTY.
1052 PM TSTM WND DMG 4 WNW CARLETON 42.07N 83.46W
10/07/2017 MONROE MI LAW ENFORCEMENT
MONROE COUNTY CENTRAL DISPATCH REPORTED TREE DOWN AT
MARTINSVILLE RD AND COLF RD.
1056 PM TSTM WND DMG 5 SW IMLAY CITY 42.97N 83.16W
10/07/2017 LAPEER MI LAW ENFORCEMENT
LAPEER COUNTY CENTRAL DISPATCH REPORTED TREE DOWN AT LAKE
PLEASANT RD AND SUTTON RD.
1056 PM TSTM WND DMG 4 ENE LAPEER 43.06N 83.24W
10/07/2017 LAPEER MI LAW ENFORCEMENT
LAPEER COUNTY CENTRAL DISPATCH REPORTED TREE FALLEN ONTO
POWER LINES ON CORNELL DR.
1105 PM TSTM WND DMG 2 E LUM 43.10N 83.11W
10/07/2017 LAPEER MI LAW ENFORCEMENT
LAPEER COUNTY CENTRAL DISPATCH REPORTED TREE DOWN AT LUM
RD AND SUMMERS RD.
1109 PM TSTM WND DMG 4 SW PORT AUSTIN 44.00N 83.05W
10/07/2017 HURON MI LAW ENFORCEMENT
HURON COUNTY CENTRAL DISPATCH REPORTED TREE DOWN ON PORT
CRESCENT RD.
1114 PM MARINE TSTM WIND 5 E ESTRAL BEACH 42.00N 83.14W
10/07/2017 M57.00 MPH LEZ444 MI C-MAN STATION
OBSERVATION AT THE DETROIT RIVER LIGHT
1132 PM TSTM WND DMG 2 NNW HARBOR BEACH 43.88N 82.67W
10/07/2017 HURON MI LAW ENFORCEMENT
HURON COUNTY CENTRAL DISPATCH REPORTED TREE DOWN AT OLD
SHORE AND MINNICK RD.
1140 PM TSTM WND DMG FORESTER 43.50N 82.57W
10/07/2017 SANILAC MI LAW ENFORCEMENT
SANILAC COUNTY CENTRAL DISPATCH REPORTED TREES DOWN ALONG
M25 IN FORESTER TOWNSHIP.
1155 PM TSTM WND GST 5 ESE MOUNT CLEMENS 42.57N 82.80W
10/07/2017 M50.00 MPH MACOMB MI PARK/FOREST SRVC
OBSERVATION AT LAKE ST. CLAIR METROPARK
Environment
Surface Maps: Progression of cold front through Michigan
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| Surface Fronts/Surface Pressure 5 PM | Surface Fronts/Surface Pressure 8 PM | Surface Fronts/Surface Pressure 11 PM |
SPC Outlooks
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| SPC Day 1 Outlook: Risk Category | SPC Day 1 Outlook: Damaging Winds | SPC Day 1 Outlook: Tornado |
Additional Environmental Parameters: Despite limited instability (CAPE) in SE Michigan, the convection that developed was able to tap into the strong winds located just above the surface - 40 kt at 925 mb (~1200 ft above the surface), 45 kt at 850 mb (~3500 ft above the surface), and 50 kt at 700 mb (~8900 ft above the surface) - and bring these winds to the surface as damaging gusts.
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| SPC Analysis: Most Unstable CAPE | SPC Analysis: 925 mb Level | SPC Analysis: 850 mb Level | SPC Analysis: 700 mb Level |
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