Overview
An organized line of thunderstorms brought widespread strong to severe thunderstorms across SE MI through the afternoon and evening hours. Thunderstorms initially became more organized across the Tri-Cities and northern Thumb during the early afternoon and brought widely scattered wind gusts between 50-60 mph, which resulted in numerous reports of downed trees and powerlines. Severe thunderstorms continued to expand southward during the late afternoon, while new storms developed just ahead of the initial line, along an expanding outflow boundary. Given the moderate to strong instability in place, thunderstorms continued to produce widely scattered damaging wind gusts as they approached the northern Metro region. A Mesoscale Convective Vortex (MCV) eventually caught up with the line in the evening hours which continued the threat of severe weather across the Metro region. Over 100,000 homes and businesses were without power after the thunderstorms moved through. For an addition in-depth environmental overview, please see the 'Environment' Section.
Photos
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Lake Orion, MI Credit: Ben Redmon |
Livonia, MI Credit: Kevin Flohr |
Madison Heights, MI Credit: Suzanne Costa |
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Livonia, MI Credit: Twitter @Erinfay |
Livonia, MI Credit: Twitter @Erinfay |
Michigan International Speedway Credit: Twitter @SHITI_Coolers |
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Novi, MI Credit: Nick Dewhirst |
Novi, MI Credit: Nick Dewhirst |
Warren, MI Credit: John Moody |
Radar
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Click to Enlarge Radar loop courtesy of Iowa Environmental Mesonet (IEM) |
Storm Reports
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Severe Weather Local Storm Reports:
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 837 AM EDT THU AUG 4 2022 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0417 PM TSTM WND GST 4 SSW FLINT 42.98N 83.73W 08/03/2022 M60.00 MPH GENESEE MI ASOS MEASURED AT FLINT BISHOP AIRPORT 0421 PM TSTM WND DMG COLUMBIAVILLE 43.16N 83.41W 08/03/2022 LAPEER MI 911 CALL CENTER REPORT OF MULTIPLE TREES AND POWERLINES DOWN 0422 PM TSTM WND DMG BYRON 42.83N 83.95W 08/03/2022 SHIAWASSEE MI 911 CALL CENTER REPORT OF MULTIPLE TREES AND POWERLINES DOWN 0425 PM TSTM WND DMG 5 S COLUMBIAVILLE 43.08N 83.40W 08/03/2022 LAPEER MI PUBLIC LARGE HEALTHY TREE DOWN ROUGHLY 18 INCHES IN DIAMETER. SENT VIA SOCIAL MEDIA PHOTO. 0425 PM TSTM WND DMG 4 W FENTON 42.81N 83.80W 08/03/2022 GENESEE MI NWS EMPLOYEE REPORT OF A DOWNED TREE 0428 PM TSTM WND DMG 4 SSE COLUMBIAVILLE 43.10N 83.39W 08/03/2022 LAPEER MI 911 CALL CENTER REPORT OF MULTIPLE TREES AND POWERLINES DOWN 0439 PM TSTM WND DMG ATTICA 43.03N 83.16W 08/03/2022 LAPEER MI 911 CALL CENTER REPORT OF MULTIPLE TREES AND POWERLINES DOWN 0445 PM TSTM WND DMG 1 NW ORTONVILLE 42.86N 83.46W 08/03/2022 OAKLAND MI AMATEUR RADIO REPORT OF MULTIPLE TREES DOWN OR SHEARED NEAR INTERSECTION OF GROVELAND RD AND M15 0502 PM TSTM WND DMG OXFORD 42.82N 83.25W 08/03/2022 OAKLAND MI TRAINED SPOTTER REPORT OF A TREE LIMBS DOWN ESTIMATED 6 TO 8 INCHES DIAMETER. PHOTO SENT VIA SOCIAL MEDIA 0512 PM MARINE TSTM WIND 1 NNE PORT HURON 43.01N 82.42W 08/03/2022 M40.00 MPH St. Clair MI C-MAN STATION 0518 PM TSTM WND DMG MANCHESTER 42.15N 84.04W 08/03/2022 WASHTENAW MI PUBLIC TREES AND POWERLINES DOWN. PHOTO SEND VIA SOCIAL MEDIA. 0554 PM TSTM WND DMG PINCKNEY 42.45N 83.95W 08/03/2022 LIVINGSTON MI PUBLIC REPORT OF SEVERAL DOWNED TREES. REPORT SENT VIA SOCIAL MEDIA PHOTOS 0605 PM TSTM WND DMG 1 SW NOVI 42.46N 83.50W 08/03/2022 OAKLAND MI PUBLIC MULTIPLE DOWNED TREES. PHOTOS SENT VIA SOCIAL MEDIA 0615 PM TSTM WND DMG 2 SW LIVONIA 42.37N 83.40W 08/03/2022 WAYNE MI PUBLIC MULTIPLE TREES DOWN OR SHEARED. REPORT SENT VIA SOCIAL MEDIA PHOTOS 0615 PM TSTM WND DMG 5 E STOCKBRIDGE 42.46N 84.08W 08/03/2022 LIVINGSTON MI 911 CALL CENTER REPORTS OF FIVE DOWNED TREES AND SEVERAL DOWNED POWERLINES 0618 PM TSTM WND DMG 3 S BROOKLYN 42.06N 84.24W 08/03/2022 LENAWEE MI PUBLIC MULTIPLE TREES DOWN AND BLOWN OVER TENTS AT MICHIGAN INTERNATIONAL SPEEDWAY 0618 PM TSTM WND DMG STERLING HEIGHTS 42.58N 83.03W 08/03/2022 MACOMB MI PUBLIC REPORT OF A DOWNED TREE ROUGHLY 18 INCHES IN DIAMETER. PHOTO SENT VIA SOCIAL MEDIA 0626 PM TSTM WND DMG 4 N DEXTER 42.38N 83.88W 08/03/2022 WASHTENAW MI TRAINED SPOTTER MULTIPLE TREE LIMBS AND POWER LINES DOWN ACROSS THE AREA. 0630 PM MARINE TSTM WIND 2 S GROSSE POINTE 42.36N 82.91W 08/03/2022 M55.00 MPH LCZ460 MI PUBLIC 0631 PM TSTM WND DMG HAMBURG 42.45N 83.80W 08/03/2022 LIVINGSTON MI 911 CALL CENTER REPORT OF MULTIPLE DOWNED TREES AND WIRES 0736 PM MARINE TSTM WIND 4 ENE ESTRAL BEACH 42.00N 83.16W 08/03/2022 M41.00 MPH LEZ444 MI C-MAN STATION 0736 PM MARINE TSTM WIND 1 S GROSSE ILE 42.11N 83.15W 08/03/2022 E39.00 MPH Wayne MI AWOS 0755 PM MARINE TSTM WIND 1 E NEWPORT 42.00N 83.28W 08/03/2022 M46.00 MPH Monroe MI PUBLIC 0900 PM HEAVY RAIN WIXOM 43.67N 84.11W 08/03/2022 M2.35 INCH BAY MI TRAINED SPOTTER 4 HOUR RAINFALL TOTAL 1000 PM HEAVY RAIN WARREN 42.49N 83.03W 08/03/2022 M1.81 INCH Macomb MI TRAINED SPOTTER 5 HOUR TOTAL. 1200 AM HEAVY RAIN PORT HURON 42.99N 82.43W 08/04/2022 M1.86 INCH ST. CLAIR MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL. 1200 AM HEAVY RAIN MOUNT CLEMENS 42.60N 82.88W 08/04/2022 M1.76 INCH MACOMB MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL. 1230 AM HEAVY RAIN 4 E WHITE LAKE 42.65N 83.43W 08/04/2022 M1.98 INCH OAKLAND MI OFFICIAL NWS OBS 8 HOUR RAINFALL TOTAL AT THE NWS WHITE LAKE OFFICE. 0651 AM HEAVY RAIN LEXINGTON 43.27N 82.53W 08/04/2022 M2.09 INCH SANILAC MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL. 0700 AM HEAVY RAIN WATERFORD 42.66N 83.39W 08/04/2022 M2.20 INCH OAKLAND MI COCORAHS 24 HOUR RAINFALL TOTAL. 0700 AM HEAVY RAIN 1 ENE ROSEVILLE 42.51N 82.92W 08/04/2022 M1.39 INCH MACOMB MI COCORAHS 24 HOUR RAINFALL TOTAL. 0700 AM HEAVY RAIN 4 N BURTON 43.05N 83.62W 08/04/2022 M1.54 INCH GENESEE MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL. 0700 AM HEAVY RAIN OWOSSO 43.00N 84.18W 08/04/2022 M1.77 INCH SHIAWASSEE MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL. 0700 AM HEAVY RAIN FLINT 43.02N 83.69W 08/04/2022 M1.72 INCH GENESEE MI OFFICIAL NWS OBS 24 HOUR RAINFALL TOTAL. 0700 AM HEAVY RAIN BLOOMFIELD HILLS 42.58N 83.25W 08/04/2022 M1.99 INCH OAKLAND MI TRAINED SPOTTER 24 HOUR RAINFALL. 0700 AM HEAVY RAIN 2 SW SHELBY TOWNSHIP 42.65N 83.06W 08/04/2022 M1.54 INCH MACOMB MI COCORAHS 24 HOUR RAINFALL TOTAL. 0700 AM HEAVY RAIN WHITMORE LAKE 42.43N 83.75W 08/04/2022 M2.26 INCH LIVINGSTON MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL. 0700 AM HEAVY RAIN 2 N CLINTON 42.10N 83.97W 08/04/2022 M1.60 INCH WASHTENAW MI COCORAHS 24 HOUR RAINFALL TOTAL. 0730 AM HEAVY RAIN LAPEER 43.05N 83.32W 08/04/2022 M1.34 INCH LAPEER MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL. 0730 AM HEAVY RAIN FARMINGTON 42.46N 83.38W 08/04/2022 M1.48 INCH OAKLAND MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL. 0738 AM HEAVY RAIN MANCHESTER 42.15N 84.04W 08/04/2022 M1.04 INCH WASHTENAW MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL. 0800 AM HEAVY RAIN BRIGHTON 42.53N 83.78W 08/04/2022 M1.30 INCH LIVINGSTON MI CO-OP OBSERVER 24 HOUR RAINFALL TOTAL.
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National Storm Reports for August 3, 2022 |
Environment
A shortwave trough that was located over the upper Mississippi Valley early Wednesday morning pivoted into the Great Lakes region through the evening, with a surface cold front extending from the James Bay and into SE Minnesota (Figure 1). Very humid conditions pushed into SE MI ahead of the front, with dew points increasing into the low to mid 70s (Figure 6), which allowed moderate to strong instability to build through the afternoon. A special 18Z RAOB sounding at DTX showed a MLCAPE ~ 2,500 J/kg (Figure 3), with values nearing 3,000 J/kg across southern Michigan (Figure 8). Upstream multicellular convection became more organized and turned increasingly linear across the Tri-Cities and northern Thumb, as surface convergence/frontogenesis increased (Figure 10). Thunderstorm activity gradually expanded southward with the modest deep layer shear (Figure 9) and where strong instability existed. Deep moisture convergence with high precipitation water values (Figure 7) with the aforementioned instability aided in the production of intense updrafts, which produced water loaded wind gusts on the order of 55-65 mph under the strongest storms. This was further enhanced by strong low-level lapse rates (Figure 11) and DCAPE values (Figure 12).
Isolated to multicellar convection started to bubble up ahead of this main line across Port Huron and the Metro region along an outflow boundary and from differential heating, with a Mesoscale Convective Vortex (MCV) from southwest Michigan eventually catching up with this line. Mini bowing segments along with continued precipitation loading brought addition strong to severe storms all the way down into the Ohio border, with wind gusts ranging between 55-65 mph. Last, due to the high moisture content, rainfall accumulation totals in excess of 2 inches fell within four hours (Figure 5) and led to localized flooding. This prompted the issuance of several flood advisories across SE MI.
Click on the images below to see them expanded.
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| Figure 1: WPC Surface Analysis, valid 2100 UTC 03 August 2022 | Figure 2: SPC Day 1 Outlook, valid 1300 UTC 03 August 2022 | Figure 3: KDTX observed sounding, valid 1800 UTC 03 August 2022 |
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| Figure 4: SPC Storm Reports, valid 03 August 2022 | Figure 5: Advanced Hydrologic Predictive Services 24 Hr Precipitation Estimates, Valid 12 UTC 03 Aug 2022 | Figure 6: Dew Points, valid 18 UTC 03 Aug 2022 |
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| Figure 7: Precipitable Water, valid 18 UTC 03 Aug 2022 | Figure 8: MLCAPE, valid 20 UTC 03 Aug 2022 | Figure 9: Effective Bulk Shear, valid 18 UTC 03 Aug 2022 |
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| Figure 10: Surface Frontogensis, valid 20 UTC 03 Aug 2022 | Figure 11: 0-3 km lapse rates, valid 18 UTC 03 Aug 2022 | Figure 12: DCAPE, valid 18 UTC 03 Aug 2022 |
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