A severe thunderstorm over Wyandotte moved into the Detroit River.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS DTX wrote it up.
A severe thunderstorm over Wyandotte moved into the Detroit River.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Detroit, MI wrote its last area forecast discussion before the first event at Aug 2, 6:04 PM EST, 4 hours 11 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 704 PM EDT SUN AUG 2 2015 .AVIATION... THUNDERSTORMS ARE SAGGING SOUTHWARD INTO THE AREA AND WILL AFFECT MBS AS THE FORECAST PERIOD BEGINS AND THEN SETTLE SOUTH THROUGH THE REMAINDER OF THE TERMINALS THROUGH ABOUT 05Z OR SO. EXPECT IFR/MVFR CONDITIONS IN THE HEAVY RAIN THAT OCCURS...WITH GUSTY WINDS WILL THE STRONGEST STORMS. IN FACT...POCKETS OF SEVERE WIND GUSTS TO 50 KNOTS IS NOT OUT OF THE QUESTION. MVFR/LOWER VFR CIGS MAY PERSIST DURING THE NIGHT WITH A STRAY SHRA OR TWO AS UPPER LEVEL TROUGH PIVOTS THROUGH...BUT GENERALLY EXPECT A TRANSITION BACK TO VFR INTO MONDAY. FOR DTW...MOST PROBABLE TIME FOR THUNDERSTORMS REMAINS IN THE 02Z- 06Z TIME FRAME AS LINE OF CONVECTION WORKS INTO AREA IN ADVANCE OF COLD FRONT. THIS FRONT WILL THEN CLEAR THE AREA LATER TONIGHT INTO MONDAY MORNING AND BRING VFR CONDITIONS. //DTW THRESHOLD PROBABILITIES... * LOW FOR TSTORMS 00Z-03Z...THEN MEDIUM 03Z-06Z TONIGHT. && .PREV DISCUSSION...ISSUED 325 PM EDT SUN AUG 2 2015 SHORT TERM...THIS AFTERNOON AND TONIGHT SCATTERED CONVECTION CONTINUES TO BUBBLE OVER FAR NORTHERN CWA ALONG WEST TO EAST OUTFLOW BOUNDARY STALLED OVER THAT AREA ALONG SOUTHERN PERIPHERY OF CONVECTIVE CLUSTER TRACK(S) FROM THIS MORNING AND EARLY AFTERNOON. EXPECT THIS ACTIVITY TO GRADUALLY INCREASE IN COVERAGE THROUGH THE REST OF THE AFTERNOON...AT LEAST NORTH OF THE INTERSTATE 69 CORRIDOR. GIVEN THE DEGREE OF INSTABILITY ADVECTING INTO AREA FROM THE WEST AND SOUTHWEST AND FEEDING THIS ACTIVITY...EXPECT SOME OF THESE STORMS TO BE SEVERE. TO THIS POINT...THIS ACTIVITY HAS HAS REMAIN CONFINED TO THE SAGINAW VALLEY AND NORTHERN THUMB. IF THIS REMAINS THE CASE...LATER ACTIVITY THIS EVENING SHOULD HAVE A STRAIGHT SHOT INTO THE AREA WITHIN TOO MUCH IMPEDANCE FROM STABILIZATION IN THE WAKE OF THIS LEAD CLUSTER OF SEVERE STORMS. THIS MAIN WIDESPREAD ACTIVITY...WHICH WILL SPREAD SOUTHWARD THROUGH THE AREA THIS EVENING...STILL LOOKS TO ORGANIZE FROM VARIOUS CONVECTIVE CLUSTERS CURRENTLY ACTIVE OVER NORTHERN WISCONSIN AND WESTERN NORTHERN LOWER MICHIGAN. AS A COLD FRONT AND STRONG UPPER LEVEL SUPPORT FROM AMPLIFYING UPPER TROUGH WORK INTO THE REGION...THESE CLUSTERS SHOULD COMBINE INTO A PRETTY SOLID LINE (OR TWO) OF STORMS AND ACCELERATE THROUGH SOUTHEAST LOWER MICHIGAN FROM MID TO LATE EVENING. WHILE LATE DAY INSTABILITY...CURRENTLY 2500 J/KG OF MLCAPE...WILL EASE BY THIS TIME...HIGH BULK SHEAR FROM STRONG WIND FIELD...ALONG WITH GENERAL UPSCALE ORGANIZATION OF THE MESOSCALE SYSTEM...SHOULD SUPPORT RATHER WIDESPREAD WIND DAMAGE. AS OF 3 PM...IT APPEARS THE STORM CLUSTER THAT WILL LIKELY BECOME OUR MAIN EVENT THIS EVENING IS ORGANIZING OVER NORTHERN WISCONSIN AS THE FULL UPPER SUPPORT OF THE DEEPENING SHORTWAVE TROUGH IS NOW SPREADING INTO THIS AREA. THIS CURRENT LOCATION SUPPORTS A SLIGHTLY FASTER ADVANCE INTO THE AREA BY PERHAPS 1 OR 2 HOURS -VS- THE PREVIOUS FORECAST THINKING. THIS BASICALLY FOCUSES THIS NEXT ROUND OF SEVERE THUNDERSTORMS AT 23Z-00Z OVER THE FAR NORTHERN CWA TO 01Z- 02Z FLINT INTO NORTHERN METRO DETROIT...AND QUICKLY SOUTH FROM THERE THE REST OF THE EVENING AS WHAT WILL MOST LIKELY BE A FORWARD PROPAGATING MCS MATURES AND RACES THROUGH LOWER MICHIGAN. LONG TERM... UPPER LOW CENTER WILL SLOWLY TRACK FROM ONTARIO TO QUEBEC MONDAY AND TUESDAY. THIS WILL KEEP THE NORTHERN AND CENTRAL GREAT LAKES CONFINED WITHIN COOLER WEST TO NORTHWEST FLOW AROUND THE BACKSIDE OF THE SYSTEM. COOLER AND QUIETER WEATHER CAN BE EXPECTED FOR THE FIRST PART OF THE WORK WEEK...ALTHOUGH A FEW SHORTWAVE TROUGHS WILL STILL PIVOT DOWN ACROSS MICHIGAN. MODELS ARE STILL KEYING IN ON A SECONDARY COLD FRONT DROPPING DOWN THROUGH NORTHERN AND CENTRAL LOWER MICHIGAN LATE MONDAY THROUGH THE FIRST PART OF MONDAY NIGHT. FORECAST CONTINUES TO CARRY A LOW CHANCE OF POPS FROM I-69 NORTH WHERE MORE MOISTURE WILL BE AVAILABLE AND WHERE COOLER MID-LEVEL AIR WILL OVERLAP WITH DIURNAL HEATING AHEAD OF THE FRONT. THE SECONDARY FRONT WILL REMAIN SETTLED OVER CENTRAL MICHIGAN INTO TUESDAY...AND MAY AGAIN PROVIDE A FOCUS FOR SHOWERS AND A FEW THUNDERSTORMS TUESDAY AFTERNOON/EVENING AS A SHORTWAVE TROUGH CLIPS ACROSS THE REGION. CONDITIONS WILL FEEL COOLER WITH DEWPOINTS DROPPING INTO MORE COMFORTABLE READINGS IN THE 50S...AND AS DAYTIME HIGHS ONLY REACH INTO THE MID 70S TO LOW 80S MONDAY AND INTO THE 70S ON TUESDAY. WEDNESDAY THROUGH SUNDAY. FAIR WEATHER IS STILL ON TRACK FOR WEDNESDAY AS HIGH PRESSURE MOVES OVER THE REGION. DRY CONDITIONS SHOULD HOLD OVER MOST OF SOUTHEAST MICHIGAN ON THURSDAY MORNING...WITH EXCEPTION OF THE SOUTHERN MOST COUNTIES WHERE SCATTERED SHOWERS WILL BEGIN TO POP. CHANCES OF SHOWERS AND THUNDERSTORMS WILL SPREAD NORTHWARD THROUGH THE AFTERNOON AND EVENING OFF LOW PUSHING INTO NORTHERN OHIO. CONFIDENCE AND TIMING ON THIS SYSTEM IS LOW TO MODERATE DUE TO MODEL INCONSISTENCIES. POTENTIAL FOR SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL LINGER INTO SATURDAY. MARINE... STRONG SOUTHWEST WINDS WITH GUSTS OF 25 TO 30 KNOTS WILL CONTINUE INTO TONIGHT IN ADVANCE OF A COLD FRONT DROPPING THROUGH THE GREAT LAKES. THE STRONGEST WINDS WILL BE OVER SAGINAW BAY...WHERE SOUTHWEST WINDS WILL FUNNEL. THE FRONT AND A WARM AND UNSTABLE AIRMASS PRECEDING IT WILL ALSO PROVIDE ROUNDS OF SHOWERS AND THUNDERSTORMS THROUGH TONIGHT...SOME OF WHICH WILL BE SEVERE. THE MOST LIKELY THREAT WITH THUNDERSTORMS WILL BE WIND GUSTS TO 50 KNOTS. WINDS WILL TURN WEST AND THEN NORTHWEST BEHIND THE FRONT MONDAY. WIND SPEEDS MONDAY LOOK TO BE GREATEST OVER NORTHERN LAKE HURON...WHERE THEY WILL REACH BETWEEN 15 TO 25 KNOTS MONDAY NIGHT THROUGH TUESDAY NIGHT AS COOLER AIR SETTLES OVER THE CENTRAL GREAT LAKES REGION. && .DTX WATCHES/WARNINGS/ADVISORIES... MI...BEACH HAZARDS STATEMENT UNTIL 10 PM EDT THIS EVENING FOR MIZ049. LAKE HURON...SMALL CRAFT ADVISORY UNTIL 4 AM EDT MONDAY FOR LHZ421-422-441>443. LAKE ST CLAIR...SMALL CRAFT ADVISORY UNTIL 4 AM EDT MONDAY FOR LCZ460. MICHIGAN WATERS OF LAKE ERIE...SMALL CRAFT ADVISORY UNTIL 4 AM EDT MONDAY FOR LEZ444. && AVIATION.....DT SHORT TERM...DG LONG TERM....HLO/DE MARINE.......HLO YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 713 PM EDT SUN AUG 2 2015 MIZ047>049-053>055-060>063-068>070-075-076-082-083-032030- MIDLAND-BAY-HURON-SAGINAW-TUSCOLA-SANILAC-SHIAWASSEE-GENESEE-LAPEER- ST. CLAIR-LIVINGSTON-OAKLAND-MACOMB-WASHTENAW-WAYNE-LENAWEE-MONROE- 713 PM EDT SUN AUG 2 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST MICHIGAN. .DAY ONE...TONIGHT THUNDERSTORMS WILL CONTINUE TO BUILD SOUTHWARD THROUGH THE AREA AHEAD OF A COLD FRONT THIS EVENING AND INTO THE OVERNIGHT. SOME OF THESE STORMS ARE EXPECTED TO BE SEVERE...ESPECIALLY BEFORE 2 AM. STORMS WILL FOCUS ALONG AND NORTH OF INTERSTATE 69 THROUGH 9 PM AND THEN SINK SOUTH INTO METRO DETROIT BETWEEN 10 PM AND MIDNIGHT. THE PRIMARY HAZARD WILL BE DAMAGING WIND GUSTS TO 60 MPH. LARGE HAIL TO ONE INCH IN DIAMETER AND AN ISOLATED TORNADO WILL ALSO BE POSSIBLE. STORM MOTION WILL BE TO THE SOUTHEAST AT 40 MPH. A BEACH HAZARDS STATEMENT IS ALSO IN EFFECT FOR HURON COUNTY. SEE THE LATEST COASTAL HAZARD MESSAGE FOR DETAIL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER AND RAINFALL AMOUNTS TO THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC. LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-032030- LAKE ST. CLAIR- MICHIGAN WATERS OF LAKE ERIE FROM DETROIT RIVER TO NORTH CAPE MI- LAKE HURON FROM 5NM EAST OF MACKINAC BRIDGE TO PRESQUE ISLE LT BEYOND 5 NM OFF SHORE- LAKE HURON FROM PRESQUE ISLE LIGHT TO STURGEON POINT MI BEYOND 5NM OFF SHORE- LAKE HURON FROM STURGEON POINT TO ALABASTER MI BEYOND 5NM OFF SHORE- OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER SAGINAW BAY-INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI- PORT AUSTIN TO HARBOR BEACH MI-HARBOR BEACH TO PORT SANILAC MI- PORT SANILAC TO PORT HURON MI- LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE- LAKE HURON FROM HARBOR BEACH TO PORT SANILAC BEYOND 5NM OFF SHORE- LAKE HURON FROM PORT SANILAC TO PORT HURON BEYOND 5NM OFF SHORE- 713 PM EDT SUN AUG 2 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE ERIE...LAKE HURON AND LAKE ST CLAIR. .DAY ONE...TONIGHT THUNDERSTORMS WILL CONTINUE TO BUILD SOUTHWARD THROUGH THE AREA AHEAD OF A COLD FRONT THIS EVENING AND INTO THE OVERNIGHT. SOME OF THESE STORMS ARE EXPECTED TO BE SEVERE...ESPECIALLY BEFORE 2 AM. THE PRIMARY HAZARD WILL BE DAMAGING WIND GUSTS TO 50 KNOTS. LARGE HAIL TO ONE INCH IN DIAMETER AND AN ISOLATED TORNADO WILL ALSO BE POSSIBLE. STORM MOTION WILL BE TO THE SOUTHEAST AT 35 KNOTS. A BEACH HAZARDS STATEMENT IS IN EFFECT FOR HURON COUNTY. SEE THE LATEST COASTAL HAZARD MESSAGE FOR DETAIL. SMALL CRAFT ADVISORIES ARE IN EFFECT. SEE THE FORECAST FOR DETAIL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT. YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE). DG
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1053 PM EDT SUN AUG 2 2015
MIZ063-068>070-075-076-030400-
LIVINGSTON-MACOMB-WASHTENAW-OAKLAND-WAYNE-ST. CLAIR-
1053 PM EDT SUN AUG 2 2015
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN ST.
CLAIR...SOUTHERN MACOMB...SOUTHERN LIVINGSTON...WAYNE...WASHTENAW AND
SOUTHERN OAKLAND COUNTIES...
AT 1053 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM ALGONAC TO NEAR MOUNT CLEMENS TO STOCKBRIDGE...AND
MOVING SOUTHEAST AT 40 MPH.
WIND GUSTS OF 50 TO 55 MPH ARE POSSIBLE WITH THESE STORMS.
LOCATIONS IMPACTED INCLUDE...
WARREN...ANN ARBOR...LIVONIA...TROY...SOUTHFIELD...TAYLOR...ST. CLAIR
SHORES...NOVI...ROMULUS...YPSILANTI...MOUNT CLEMENS...FLAT ROCK...
SALINE...BRIGHTON...MILAN...GROSSE POINTE...CHELSEA...ALGONAC...
DEXTER AND PINCKNEY.
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.
LAT...LON 4262 8254 4261 8271 4261 8253 4255 8259
4256 8284 4239 8290 4224 8315 4209 8315
4208 8316 4218 8316 4209 8319 4208 8413
4248 8414 4262 8282 4259 8276 4260 8276
4271 8250
TIME...MOT...LOC 0253Z 305DEG 35KT 4261 8251 4255 8290 4245 8415
SCPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1059 PM EDT SUN AUG 02 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0740 PM TSTM WND DMG 2 W PECK 43.26N 82.86W
08/02/2015 SANILAC MI TRAINED SPOTTER
NUMEROUS MEDIUM SIZE BRANCHES DOWN
&&
DTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1101 PM EDT SUN AUG 02 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1048 PM HEAVY RAIN 2 N DAVISON 43.06N 83.52W
08/02/2015 M1.00 INCH GENESEE MI TRAINED SPOTTER
ONE INCH OF RAIN IN ONE HOUR.
1053 PM TSTM WND GST 5 NNW DEARBORN 42.38N 83.24W
08/02/2015 E60.00 MPH WAYNE MI TRAINED SPOTTER
60 MPH WIND REPORTED BY SPOTTER AT JOY RD AND EVERGREEN
&&
DELLIOTTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1104 PM EDT SUN AUG 02 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0932 PM HEAVY RAIN SWARTZ CREEK 42.96N 83.83W
08/02/2015 M1.75 INCH GENESEE MI AMATEUR RADIO
OVER 1 INCH OF RAIN IN LESS THAN AN HOUR. MILLER RD AND
MORRIS RD.
&&
DELLIOTTPRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1105 PM EDT SUN AUG 02 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0932 PM HEAVY RAIN SWARTZ CREEK 42.96N 83.83W
08/02/2015 M1.75 INCH GENESEE MI AMATEUR RADIO
OVER 1.5 INCHES OF RAIN IN LESS THAN AN HOUR. MILLER RD
AND MORRIS RD.
&&
DELLIOTTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1113 PM EDT SUN AUG 02 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1030 PM HEAVY RAIN 2 W PECK 43.26N 82.86W
08/02/2015 M2.71 INCH SANILAC MI TRAINED SPOTTER
3 HOUR TOTAL
&&
DTThe Detroit radar (KDTX), 61 km away, was scanning. The volume nearest the first event began at 03:15 UTC.
1 marine thunderstorm wind. Local standard time, as filed.
A thunderstorm which brought down a small tree in Wyandotte moved into the Detroit River.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake St. Clair in 2015Every state in 2015This day in weather history
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 598160.