A thunderstorm moving into Lake St. Clair produced a measured thunderstorm wind gust of 47 mph.
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The episode as NWS DTX wrote it up.
A thunderstorm moving into Lake St. Clair produced a measured thunderstorm wind gust of 47 mph.
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 19, 6:24 PM EST, 28 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 724 PM EDT THU AUG 19 2010 .AVIATION... COLD FRONT CURRENTLY SAGGING SOUTH THROUGH THE AREA WILL SHIFT WINDS FROM WEST TO NORTHEAST EARLY IN THE FORECAST. SCATTERED SHOWERS AND THUNDERSTORMS ALONG AND BEHIND THIS FEATURE MAY ALSO BRUSH FNT/DET EARLY IN THE FORECAST PERIOD AS THEY EXIT THE MBS AREA. ONCE THESE STORMS WEAKEN AND MOVE EAST OF THE AREA...EXPECT VFR CONDITIONS AT ALL SITES WITH EAST/NORTHEAST WINDS OVERNIGHT VEERING TO THE SOUTH WITH TIME AS A WARM FRONT LIFT BACK NORTH THROUGH THE AREA FRIDAY. && .PREV DISCUSSION...ISSUED 358 PM EDT THU AUG 19 2010 SHORT TERM...THIS EVENING AND TONIGHT TAIL END OF MAIN SHORTWAVE ENERGY...NOW POSITIONED ACROSS ONTARIO AND QUEBEC...SUPPORTED THE MAINTENANCE OF SCATTERED THUNDERSTORM ACTIVITY ALL DAY ACROSS PORTIONS OF CENTRAL LOWER MICHIGAN. SATELLITE IMAGERY SUGGESTS THE BULK OF LARGE SCALE FORCING HAS VACATED THE PREMISES...WITH MUCH OF THE BACKGROUND SUPPORT NOW HANDED OVER TO THE FRONTAL CIRCULATION. THE BELT OF THE COUPLED JET STRUCTURE IS IN PLACE OVERHEAD...AND IS SUPPORTING 0-6KM BULK SHEAR IN EXCESS OF 40 KNOTS. BEHAVIOR OF CELLS THIS AFTERNOON DEFINITELY SUPPORTS THAT AMOUNT OF SHEAR...WITH A RATHER SURPRISING LONGEVITY TO THE DISCRETENESS. INSTABILITY REMAINS THE MARGINAL COMPONENT...SBCAPES OF 1000-1200 J/KG AND MLCAPES SUB 1000 J/KG. THE CELL EARLIER ACROSS TUSCOLA COUNTY MADE IT TO SEVERE LIMITS..WITH SUSPICION THAT DIURNAL HEATING PEAK PLAYED A FACTOR. WITH THE LACK OF FORCING FOR ASCENT...THE COVERAGE OF SHOWERS AND THUNDERSTORMS SHOULD REMAIN SCATTERED FOR THE REMAINDER OF THE EVENT. THE SEVERE THREAT REMAINS RATHER LIMITED WITH MEAGER LAPSE RATES OVERALL...WITH PERHAPS A WINDOW FOR ISOLATED SEVERE DURING THE NEXT COUPLE OF HOURS. AN ADDITIONAL WEAK CYCLONIC VORTICITY FILAMENT IS POISED TO SWEEP ACROSS SOUTHEASTERN MICHIGAN YET THIS AFTERNOON/EARLY THIS EVENING. THEREFORE...THE CHANCE/SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS CONTINUES FOR POINTS SOUTHWARD (BETWEEN THE I 69 AND I 94 CORRIDORS) PRIOR TO 3-4Z. THE FRONTAL PASSAGE/VEERING TO EASTERLIES THIS EVENING WILL QUICKLY END THE THREAT FOR SHOWERS AND THUNDERSTORMS FOR THE REMAINDER OF THE NIGHT. A VERY DRY AIRMASS BEHIND THE COLD FRONT WILL ALLOW LOWS TONIGHT TO DIP INTO THE 50S ACROSS THE NORTH WITH LOWER 60S ACROSS THE SOUTH. LONG TERM... UPPER LEVEL TROUGH/JET ENERGY WILL COME OUT OF THE CENTRAL ROCKIES AND MOVE THROUGH THE GREAT LAKES REGION DURING THE FIRST HALF OF THE WEEKEND. GOOD MOISTURE PLUME/850-700 MB THETA-E RIDGE AHEAD OF THE COLD FRONT SHOULD PROVIDE A HIGH CHANCE OF SHOWERS AND THUNDERSTORMS ON SATURDAY. BEFORE WE GET THERE...WILL HAVE TO WATCH WARM FRONT WHICH LIFTS NORTH THROUGH THE WESTERN GREAT LAKES TOMORROW. HOWEVER...WITH UPPER LEVEL RIDGE IN PLACE OVER THE CENTRAL GREAT LAKES...EXPECTING ACTIVITY TO REMAIN MAINLY CONFINED TO OUR NORTHWEST WHERE THE BETTER DEFINED WARM FRONT WILL RESIDE...AS MAIN SHORTWAVE LIFTS NORTHEAST INTO LAKE SUPERIOR. SURFACE WINDS OUT OF THE SOUTHEAST SHOULD ALSO TAMPER OUR WARMUP AND INSTABILITY TO A DEGREE...AND MAINTAINED THE LOW TO MID 80S FORECAST. 850 MB THERMAL RIDGE AXIS AROUND 20 C WOULD SUPPORT MAXES AROUND 90 DEGREES ON SATURDAY...BUT FORECAST WILL BANK ON HIGH SCATTERED COVERAGE OF SHOWER/THUNDERSTORM ACTIVITY AND LIMITED INSOLATION HOLDING MAXES IN PREDOMINATELY IN THE MID 80S. LATEST GFS/EUROPEAN (12Z GFS) ADVERTISING THE UPPER LEVEL TROUGH AXIS AND ASSOCIATED COLD FRONT/SURFACE LOW WILL CLEAR THE STATE BY 12Z SUNDAY...LEADING TO A WARM AND DRY SUNDAY. A LITTLE CONCERNED THE SLOWING TREND MAY CONTINUE AS CLOSED 500 MB LOW SHOULD DEVELOP OVER THE EASTERN GREAT LAKES...WITH NORTHERLY CYCLONIC FLOW AND POSSIBLE SPOKE OF ENERGY COMING DOWN ON THE BACKSIDE OF THIS SYSTEM. AT THIS POINT...DECIDED TO INCREASE SKY COVER ACROSS EASTERN AREAS. STRONG HIGH PRESSURE LOOKS TO DOMINATE THE AREA NEXT WEEK WITH THE EXCEPTION OF A BRIEF PERIOD IN THE TUESDAY/WEDNESDAY TIME FRAME. DURING THAT TIME A DEEP SURFACE LOW UNDER A BROAD UPPER TROUGH WILL TRACK ACROSS THE HUDSON BAY DROPPING A WEAKENING COLD FRONT DOWN THROUGH THE REGION SOMETIME TUESDAY NIGHT. MODELS CONTINUE TO SHOW LITTLE IN THE WAY OF MOISTURE WITH THIS FRONT...AND WITH THE FRONT FORECAST TO PASS QUICKLY THOUGH THE AREA...WILL KEEP LOW CHANCE POPS IN THE FORECAST. BETTER CHANCES FOR PRECIPITATION LOOK TO BE ACROSS THE NORTHERN HALF OF LAKE HURON...BUT THERE IS A SLIGHT CHANCE FOR PRECIP TO MAKE IT FURTHER SOUTH. MARINE... A COLD FRONT IS EXPECTED TO MOVE THROUGH SOUTHEASTERN MICHIGAN TONIGHT STALLING NEAR THE OHIO BORDER TOWARDS MORNING. ALONG WITH TRIGGERING SOME THUNDERSTORMS...THE PASSAGE OF THIS FRONT WILL ALSO CAUSE THE WINDS TO SHARPLY VEER TO THE NORTH-NORTHEAST. THE WINDS SHOULD ALSO BECOME RATHER GUSTY FOR A COUPLE OF HOURS FOLLOWING THE FRONT AS COLD AIR ADVECTION CREATES AN UNSTABLE PROFILE OVER THE LAKES. SURFACE HIGH PRESSURE WILL BUILD IN FROM THE NORTH TONIGHT AND WILL QUICKLY DIMINISH THE WINDS DURING THE EVENING. WINDS WILL BECOME SOUTHEASTERLY ON FRIDAY AND INCREASE IN SPEED FRI NIGHT INTO SATURDAY IN ADVANCE OF LOW PRESSURE MOVING INTO THE REGION FROM THE WEST. HIGH PRESSURE WILL THEN BRING LIGHTER WINDS BY SUNDAY THROUGH && .DTX WATCHES/WARNINGS/ADVISORIES... MI...NONE. LAKE HURON...NONE. LAKE ST CLAIR...NONE. MI WATERS OF LAKE ERIE...NONE. && AVIATION.....DG SHORT TERM...CB LONG TERM....SF/DRK MARINE.......CB 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 505 AM EDT THU AUG 19 2010 MIZ047>049-053>055-060>063-068>070-200830- MIDLAND-BAY-HURON-SAGINAW-TUSCOLA-SANILAC-SHIAWASSEE-GENESEE-LAPEER- ST. CLAIR-LIVINGSTON-OAKLAND-MACOMB- 505 AM EDT THU AUG 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NORTHERN DETROIT SUBURBS...THE INTERSTATE 69 CORRIDOR...THE TRI CITIES AND THE THUMB. .DAY ONE...TONIGHT WIDELY SCATTERED THUNDERSTORMS CAN BE EXPECTED ALONG A WEAK COLD FRONT THAT WILL DROP SOUTHEAST THROUGH THE AREA INTO THIS EVENING. WHILE SEVERE WEATHER WILL NOT BE WIDESPREAD...ISOLATED WIND GUSTS TO AROUND 60 MPH WILL BE POSSIBLE ALONG WITH LARGE HAIL TO NEAR ONE INCH IN DIAMETER. STORM MOTION WILL BE SOUTHEAST AT 30 MPH. EXPECT THIS ACTIVITY TO DIMINISH AFTER SUNSET AS DAYTIME HEATING IS LOST. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS FROM LATE FRIDAY THROUGH SATURDAY NIGHT AS A SLOW MOVING LOW PRESSURE SYSTEM APPROACHES FROM THE WEST. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME AS THUNDERSTORM ACTIVITY WILL REMAIN ISOLATED. MIZ075-076-082-083-200830- WASHTENAW-WAYNE-LENAWEE-MONROE- 505 AM EDT THU AUG 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WASHTENAW...WAYNE...LENAWEE AND MONROE COUNTIES. .DAY ONE...TONIGHT THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS EVENING AS A WEAK COLD FRONT PROGRESSES THROUGH THE AREA. SEVERE WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS FROM LATE FRIDAY THROUGH SATURDAY NIGHT AS A SLOW MOVING LOW PRESSURE SYSTEM APPROACHES FROM THE WEST. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. LCZ422-423-460-LEZ444-LHZ361>363-421-422-441>443-462>464-200830- 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- 505 AM EDT THU AUG 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE ERIE...LAKE HURON AND LAKE ST CLAIR. .DAY ONE...TONIGHT WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED THIS EVENING. SEVERE WEATHER IS NOT ANTICIPATED AT THIS TIME. HOWEVER...SOME STORMS WILL BE CAPABLE OF PRODUCING WIND GUSTS TO 40 KNOTS AND HALF INCH DIAMETER HAIL AS THEY TRACK TO THE SOUTHEAST AT 35 MPH. THESE STORMS ARE ASSOCIATED WITH A COLD FRONT MOVING SOUTH ACROSS THE REGION. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS FROM LATE FRIDAY THROUGH SATURDAY NIGHT AS A SLOW MOVING LOW PRESSURE SYSTEM APPROACHES FROM THE WEST. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. SC/DG YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
721 PM EDT THU AUG 19 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0707 PM TSTM WND DMG LAKE ORION 42.78N 83.24W
08/19/2010 OAKLAND MI TRAINED SPOTTER
8 TO 10 INCH DIAMETER LIMBS DOWNED
&&
DGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
738 PM EDT THU AUG 19 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0703 PM TSTM WND DMG OXFORD 42.82N 83.25W
08/19/2010 OAKLAND MI TRAINED SPOTTER
NUMEROUS TREES DOWNED THROUGHOUT TOWN WITH ESSENTIALLY
ALL TREES IN DOWNTOWN AREA DAMAGED. POWERLINES ARE ALSO
DOWNED AND ELECTRICITY IS OUT.
&&
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</html>The Detroit radar (KDTX), 55 km away, was scanning. The volume nearest the first event began at 23:52 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 St. Clair in 2010Every state in 2010This 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 2026-09-30. Each event’s entry at NCEI: 257960.