A thunderstorm moving through Inner Saginaw Bay produced a 56 mph thunderstorm wind gust.
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The episode as NWS DTX wrote it up.
A thunderstorm moving through Inner Saginaw Bay produced a 56 mph thunderstorm wind gust.
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 Sep 5, 11:32 AM EST, 1 hour 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 1232 PM EDT WED SEP 5 2012 .AVIATION... //DISCUSSION... BOUNDARY LAYER MOISTURE HAS BEEN SLOW TO MIX OUT THIS OUT THIS MORNING RESULTING IN IFR CLOUDS/VSBYS PERSISTING LONGER THAN EXPECTED. AT ISSUANCE TIME, HOWEVER, VISIBILITIES HAVE IMPROVED AND CEILINGS HAVE LIFTED ABOVE 5KFT FOR NEARLY ALL LOCATIONS. ANY LINGERING LOW CLOUDS WILL CONTINUE TO MIX OUT OVER THE NEXT HOUR OR TWO. PERIODIC THUNDERSTORM ACTIVITY WILL THEN HAVE AT LEAST THREE WELL-DEFINED OPPORTUNITIES TO AFFECT THE TAF SITES OVER THE NEXT 18 HOURS. THE FIRST IS ASSOCIATED WITH ONGOING ACTIVITY ACROSS SOUTHERN LOWER MICHIGAN THAT WILL POTENTIALLY IMPACT THE AIRFIELDS FROM KPTK SOUTH AROUND 18Z. ADDITIONAL THUNDERSTORMS, AIDED BY MODERATE DIURNAL DESTABILIZATION, WILL BE POSSIBLE IN THE 20-00Z TIME FRAME THIS AFTERNOON FOLLOWED BY ANOTHER ROUND IN THE 06Z-12Z WINDOW AS THE COLD FRONT FINALLY BEGINS TO PUSH THROUGH SOUTHEAST MICHIGAN. CONFIDENCE IN ANY ONE LOCATION SEEING THUNDER REMAINS LOW FOR ALL THREE INSTANCES, THOUGH THE BEST CHANCE WILL BE THIS EVENING DURING PEAK HEATING WHEN THUNDERSTORM INTENSITY AND COVERAGE IS FORECAST TO BE GREATEST. TSTORMS WILL THEREFORE BE HANDLED ON AN AMENDMENT BASIS AS INDIVIDUAL THREATS PRESENT THEMSELVES. AWAY FROM SHOWER/TSTORM ACTIVITY, CONDITIONS WILL REMAIN VFR WITH A LOW VFR/SUB-5KFT CEILING OF DIURNAL CU POSSIBLE THIS AFTERNOON. //DTW THRESHOLD THREATS... * LOW CONFIDENCE THAT A THUNDERSTORM WILL IMPACT KDTW * MEDIUM CONFIDENCE OF CEILINGS AROUND 5000 FEET BY THIS EVENING. && .PREV DISCUSSION...ISSUED 325 AM EDT WED SEP 5 2012 SHORT TERM...TODAY AND TONIGHT THIN CIRRUS BLOWOFF FROM CONVECTION TO THE WEST HAS BEEN ENOUGH TO KEEP DENSE FOG FROM BECOMING TOO WIDESPREAD EARLY THIS MORNING. WITH A GRADUAL INCREASE IN HIGH CLOUDS EXPECTED FOR THE REST OF THE EARLY MORNING HOURS...WILL NOT ISSUE A DENSE FOG ADVISORY AS VISIBILITIES BELOW ONE QUARTER MILE WILL BE SOMEWHAT PATCHY AND TRANSIENT. ANY REMAINING FOG WILL DISSIPATE AFTER SUNRISE. THE INITIAL CONVECTION BRINGING THIS CIRRUS WILL SLOWLY FADE AS LOW LEVEL JET IS NOW BEING INTERCEPTED BY MATURING MCS RACING EAST INTO WISCONSIN. SO...ONLY A FEW SHOWERS WILL CREEP INTO THE AREA EARLY IN THE MORNING. THIS NEXT MCS APPEARS TO HAVE A GOOD CHANCE OF MOVING INTO LOWER MICHIGAN AS IT HAS RACES OUT WELL IN ADVANCE OF THE COLD FRONT AND SHORTWAVE TROUGH THAT INITIATED IT OVER THE NORTHERN PLAIN STATES. THIS WILL MAKE SHOWER/THUNDERSTORM ACTIVITY LIKELY EARLIER THAN ORIGINALLY THOUGHT...SO WILL PULL FORWARD RAIN CHANCES TO THE MIDDLE OF THE DAY WITH LINGERING ACTIVITY EXPECTED INTO THE EVENING AND EVEN OVERNIGHT AS THE AFOREMENTIONED SHORTWAVE AND COLD FRONT EVENTUALLY MOVES THROUGH THE AREA. THE COMBINATION OF DECENT WIND SHEAR WITHIN THE EDGE OF THE STRONG WESTERLIES OVER THE NORTHERN TIER OF THE CONUS AND MODEST INSTABILITY AS DAYTIME HEATING BRINGS SBCAPES INTO THE 1000-1500 J/KG WILL LEAD TO SOME POSSIBILITY OF SEVERE WEATHER WITH SOME OF THESE STORMS EVEN AS THE BETTER CHANCE LIKELY FOCUSES JUST SOUTHWEST OF THE AREA AS ONGOING MCS PROPAGATES SLIGHTLY SOUTHWARD INTO BETTER LOW LEVEL MOISTURE OVER THE OHIO VALLEY. WITH LESS IN THE WAY OF SUNSHINE DUE TO THE INCREASE IN CLOUDS WITH THIS LEAD ACTIVITY...WILL LOWER HIGH TEMPERATURES SEVERAL DEGREES TODAY WITH HIGHS TOPPING OUT IN THE MIDDLE 80S. LONG TERM... PLENTY OF RESERVOIRS OF UPPER LEVEL PV TO TAP INTO FOR THE EXTENDED PERIOD...CULMINATING IN AN AMPLIFYING UPPER LEVEL TROUGH OVER THE WEEKEND...ALTHOUGH 00Z MODEL GUIDANCE SUGGEST IT MAY BE A BIT MORE PROGRESSIVE AND FARTHER EAST. LATEST WATER VAPOR IMAGERY SHOWS LARGE UPPER LEVEL LOW OVER NORTHERN MANITOBA...WHICH WILL DIRECT THE TRAFFIC OF UPPER WAVES. THE 500 MB LOW/CIRCULATION IS PROGGED TO LIFT NORTHEAST A BIT FASTER OVER THE WEEKEND...AS IT CONSOLIDATES WITH THE POTENT UPPER WAVE CURRENTLY WORKING THROUGH NORTH DAKOTA. THIS UPPER WAVE WILL HELP DRIVE THE COLD FRONT SOUTHEAST...EXITING SOUTHEAST MICHIGAN SHORTLY AFTER 12Z THURSDAY. THERE IS A SMALL CHANCE CONVECTION CAN FIRE UP BEFORE FRONT CLEARS THE STATE...BUT THURSDAY WILL BE WARM AND DRY FOR THE MOST PART...AS LOW LEVEL COLD ADVECTION STRUGGLES TO MAKE MUCH PROGRESS DURING THE DAYTIME HOURS. STILL...NORTHERLY FLOW OFF LAKE HURON AND EXTENSIVE CU FIELD WITH RESIDUAL MOISTURE (SEE NAM 850 MB RH) WILL LIKELY HOLD TEMPS IN THE UPPER 70S NORTH TO LOWER 80S SOUTH. NEXT BATCH OF ENERGY CURRENTLY DIVING SOUTH THROUGH WESTERN CANADA WILL SWING THROUGH THE NORTHERN ROCKIES AND THEN MIDWEST ON FRIDAY. STRONG MID LEVEL FGEN RESPONSE FRIDAY NIGHT SHOULD SUPPORT WIDESPREAD RAIN SHOWERS ACROSS SOUTHEAST MICHIGAN AS POTENTIAL COUPLED JET STRUCTURE SETS UP...PER 00Z CANADIAN/UKMET. SUNDAY IS A BIT MORE UP IN THE AIR...AS THE LONGWAVE TROUGH AXIS WILL PROBABLY BE JUST EAST OF LOWER MICHIGAN. STILL...THERE IS A STRONG SHORTWAVE PROGGED TO TRACK ON THE BACKSIDE OF THE TROUGH WITHIN THE NORTHWEST FLOW...BUT TIMING RIGHT NOW LOOKS MORE LIKE SATURDAY NIGHT...AND THUS SUNDAY IS SHAPING UP TO BE A NICER DAY. MARINE... WINDS AND WAVES WILL BOTH REMAIN FAIRLY BENIGN TODAY AS WEAK HIGH PRESSURE SLOWLY DRIFTS EAST OF THE AREA. A STRONG LOW PRESSURE WILL THEN TRACK ACROSS NORTHERN ONTARIO LATE TODAY INTO TONIGHT...PULLING A COLD FRONT ACROSS MICHIGAN. MCS ACTIVITY WILL LIKELY BRING AN INCREASING CHANCE OF SHOWERS/THUNDERSTORMS IN ADVANCE OF THIS FRONT BY MIDDAY WITH PRECIPITATION CHANCES THEN PERSISTING UNTIL THE FRONT HAS CLEARED THE AREA LATE TONIGHT. THERE WILL BE SOME POTENTIAL FOR A FEW SEVERE THUNDERSTORMS AS WELL. NORTHWEST WINDS AND WAVES WILL ALSO INCREASE BEHIND THE FRONT ON THURSDAY...BUT REMAIN BELOW ANY HEADLINE CRITERIA. && .DTX WATCHES/WARNINGS/ADVISORIES... MI...NONE. LAKE HURON...NONE. LAKE ST CLAIR...NONE. MI WATERS OF LAKE ERIE...NONE. && AVIATION.....JVC SHORT TERM...DG LONG TERM....SF MARINE.......DG 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 911 AM EDT WED SEP 5 2012 MIZ047>049-053>055-060>063-068>070-075-076-082-083-060815- MIDLAND-BAY-HURON-SAGINAW-TUSCOLA-SANILAC-SHIAWASSEE-GENESEE-LAPEER- ST. CLAIR-LIVINGSTON-OAKLAND-MACOMB-WASHTENAW-WAYNE-LENAWEE-MONROE- 911 AM EDT WED SEP 5 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST MICHIGAN. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS CAN BE EXPECTED TODAY AND TONIGHT. THESES STORMS WILL BE STRONG TO POSSIBLY SEVERE...WITH THE STRONGEST ONES CAPABLE OF PRODUCING WIND GUSTS TO 60 MPH...HAIL TO ONE INCH IN DIAMETER...AND TORRENTIAL RAINFALL. STORM MOTION WILL BE EAST AT 35 MPH. A STRONG COLD FRONT APPROACHING FROM THE WEST WILL TRIGGER THE STORMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A SLIGHT CHANCE OF A LEFTOVER THUNDERSTORM THURSDAY MORNING SOUTH OF I-69 AS THE COLD FRONT CLEARS THE STATE. .SPOTTER INFORMATION STATEMENT... DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING. LCZ422-423-460-LEZ444-LHZ361>363-421-422-441>443-462>464-060815- ST. CLAIR RIVER-DETROIT RIVER-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- 911 AM EDT WED SEP 5 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE ERIE...LAKE HURON AND LAKE ST CLAIR. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS CAN BE EXPECTED TODAY AND TONIGHT. THESES STORMS WILL BE STRONG TO POSSIBLY SEVERE...WITH THE STRONGEST ONES CAPABLE OF PRODUCING WIND GUSTS TO 60 MPH...HAIL TO ONE INCH IN DIAMETER...AND TORRENTIAL RAINFALL. STORM MOTION WILL BE EAST AT 30 KNOTS. A STRONG COLD FRONT APPROACHING FROM THE WEST WILL TRIGGER THE STORMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A SLIGHT CHANCE OF A LEFTOVER THUNDERSTORM THURSDAY MORNING OVER LAKE ST CLAIR AND LAKE ERIE AS THE COLD FRONT CLEARS THE REGION. .SPOTTER INFORMATION STATEMENT... DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING. SF YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
The Detroit radar (KDTX), 125 km away, was scanning. The volume nearest the first event began at 18:28 UTC.
1 marine thunderstorm wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Huron in 2012Every state in 2012This 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: 407505.