An isolated pulse severe event near Highland resulted in large tree branches down.
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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.
An isolated pulse severe event near Highland resulted in large tree branches down.
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 May 30, 2:23 PM EST, 3 hours 27 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 323 PM EDT WED MAY 30 2007 .SHORT TERM...TONIGHT THE FORECAST FOR TODAY HAS BEEN RIGHT ON TRACK WITH MAXES PEAKING OUT IN THE UPPER 80S AND ISOLATED SHOWERS AND THUNDERSTORMS DEVELOPING DURING THE MID AFTERNOON HOURS. WILL BE CONTINUING WITH THE ISOLATED MENTION INTO TONIGHT...HOWEVER NO SEVERE WEATHER IS EXPECTED WITH MID AFTERNOON LAPS DATA SHOWING CAPES HOLDING AROUND 1500 J/KG. AS MENTIONED EARLIER...WEAK WIND FIELDS (0-6 KM BULK SHEAR 10 KNOTS OR LESS)/HIGH FREEZING LEVELS/LACK OF A SIGNIFICANT TRIGGER-LOW LEVEL CONVERGENCE JUST DOES NOT SUPPORT SEVERE WEATHER WITH THE SOMEWHAT SKINNY CAPE BELOW 2000 J/KG. INTERSECTING BOUNDARIES (LAKE BREEZE/OUTFLOW) IS REALLY THE ONLY POSSIBLE SCENARIO WHERE A STRONGER CELL COULD DEVELOP...WHICH REMAINS UNLIKELY. IN ADDITION...INCREASING BOUNDARY LAYER DEPTH HAS LEAD TO DEW POINTS FALLING INTO THE MID TO UPPER 50S ACROSS PARTS OF THE CWA...WHICH SUPPORTS JUST ISOLATED COVERAGE. 850 MB THETA-E RIDGE AND INSTABILITY (SHOWALTER INDEX SLIGHTLY LESS THAN ZERO) OVER SOUTHEAST MICHIGAN SUPPORTS THE CONTINUED SLIGHT CHANCE THROUGH THE NIGHT. 24 HOUR CHANGE IN TEMP/DEW POINT CALLS FOR MINS (ON AVERAGE) TO BE AT LEAST 3 DEGREES WARMER TONIGHT COMPARED TO THIS MORNING...AND WILL CARRY OVERNIGHT LOWS PREDOMINATELY IN THE MID 60S. && .LONG TERM...THURSDAY THROUGH WEDNESDAY THE UPPER LEVEL PATTERN IS GRADUALLY BECOME PROGRESSIVE LATE THIS WEEK AS UPPER RIDGE OVER THE EASTERN CONUS SHIFTS EASTWARD AND THE UPPER LOW OVER THE NORTHERN ROCKIES/PLAINS MEANDERS INTO THE UPPER MIDWEST. THIS WILL LEAVE LOWER MICHIGAN WITHIN A STEADY SOUTHERLY STREAM OF HOT/HUMID AIR IN BETWEEN THESE FEATURES. THE INSTABILITY WITHIN THIS REGIME WILL BE FAVORABLE FOR THUNDERSTORMS. THE TRICK WILL BE FINDING FORCING MECHANISMS TO FOCUS CONVECTION. THIS WILL BE A TALL ORDER ON THURSDAY AND FRIDAY AS ONLY EXPECT WEAK SHORTWAVES WITHIN THIS MOISTURE PLUME TO RIPPLE THROUGH THE AREA. THIS SETUP IS CERTAINLY WORTH A CONTINUED CHANCE OF THUNDERSTORMS AS IF NOTHING ELSE THESE WAVES WILL INTERACT WITH POTENTIAL LAKE BOUNDARIES TO PRODUCT ISOLATED/SCATTERED CONVECTION. IN FACT...WOULD EXPECT THE OVERALL ENVIRONMENT TO BE MORE CONDUCIVE TO THUNDERSTORMS AS THE AFOREMENTIONED RIDGE EDGES FURTHER EAST. BY THIS WEEKEND...THE UPPER LOW OVER THE NORTHERN PLAINS WILL MOVE INTO THE AREA...BRINGING A BETTER CHANCE OF WIDESPREAD CONVECTION. THIS WILL BE ESPECIALLY THRU BY SATURDAY NIGHT/SUNDAY AS THE UPPER LOW TRACKS THROUGH THE REGION. BEFORE THAT...THE INITIAL FRONT THAT THIS SYSTEM PUSHES INTO THE AREA WILL WEAKEN CONSIDERABLY AS IT BECOMES PARALLEL TO THE UPPER LEVEL FLOW AND BASICALLY STALLS OVER THE AREA ON SATURDAY. AS THIS UPPER LOW OPENS AND TRACKS INTO THE EASTERN GREAT LAKES ON MONDAY...ADDITIONAL SHORTWAVE ENERGY WILL FUNNEL SOUTHEAST THROUGH EASTERN CANADA...AND HELP CARVE OUT AN UPPER TROUGH AT LEAST THROUGH THE MIDDLE OF NEXT WEEK. WITHIN THIS PATTERN...EXPECT MORE ISOLATED TO SCATTERED SHOWERS...ESPECIALLY DURING THE PEAK AFTERNOON/EVENING INSTABILITY. ALSO...THIS WILL BRING A RETURN TO MORE SEASONABLE TEMPERATURES IN THE MID 70S (AS OPPOSED TO THE 85-90 DEGREE WEATHER THAT WILL PERSIST INTO FRIDAY). && .MARINE... SOUTHWEST FLOW WILL PERSIST OVER THE AREA INTO EARLY THIS WEEKEND AS HIGH PRESSURE REMAINS CENTERED OFF TO THE SOUTHEAST...AND AN UPPER TROUGH SLOWLY TRACKS THROUGH THE NORTHERN PLAINS INTO THE WESTERN GREAT LAKES. RELATIVELY UNSTABLE CONDITIONS WILL PERSIST WITHIN THIS FLOW...LEADING TO ISOLATED TO SCATTERED SHOWERS/THUNDERSTORMS INTO SATURDAY...PARTICULARLY IN THE AFTERNOON/EARLY EVENING. WITH THE APPROACH OF THE UPPER TROUGH...AND ASSOCIATED SURFACE FRONT...THE COVERAGE OF SHOWERS/THUNDERSTORMS WILL INCREASE HEADING INTO THE LATER PART OF THE WEEKEND. && .PREV DISCUSSION...ISSUED AT 1252 PM AVIATION... INCREASING INSTABILITY OVER SOUTHEAST MICHIGAN WILL LEAD TO CU DEVELOPMENT (5000-7000 FEET) THIS AFTERNOON WITH ISOLATED THUNDERSTORMS EXPECTED INTO TONIGHT. UNCERTAINTY WITH EXACT LOCATION AND COVERAGE PRECLUDES THE MENTION AT TAF SITES. THE OTHER ISSUE IS STEEP MORNING SURFACE BASED INVERSION HAS LIMITED MIXING THUS FAR...RESULTING IN HAZE (5-6SM) DUE TO INCREASE IN LOW LEVEL MOISTURE. BOUNDARY LAYER WILL CONTINUE TO INCREASE DURING THE AFTERNOON...WITH SURFACE DEW POINTS RESPONDING BY DROPPING A FEW DEGREES TO ALLOW P6SM VSBYS. HOWEVER...WOULD EXPECT HAZE TO REDEVELOP LATE TONIGHT/TOMORROW MORNING. WINDS TO REMAIN LIGHT (10 KNOTS OR LESS) THROUGH THE PERIOD. && .DTX WATCHES/WARNINGS/ADVISORIES... MI...NONE. LAKE HURON...NONE. LAKE ST CLAIR...NONE. MI WATERS OF LAKE ERIE...NONE. && SHORT TERM...SF LONG TERM....DG MARINE.......DG AVIATION.....SF 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 500 AM EDT WED MAY 30 2007 MIZ047>049-053>055-060>063-068>070-075-076-082-083-310900- MIDLAND-BAY-HURON-SAGINAW-TUSCOLA-SANILAC-SHIAWASSEE-GENESEE-LAPEER- ST. CLAIR-LIVINGSTON-OAKLAND-MACOMB-WASHTENAW-WAYNE-LENAWEE-MONROE- 500 AM EDT WED MAY 30 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF SOUTHEAST MICHIGAN. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND TONIGHT. THESE STORMS ARE NOT EXPECTED TO BE SEVERE AS THEY TRACK FROM SOUTHWEST TO NORTHEAST AT AROUND 15 MPH. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY CHANCES FOR THUNDERSTORMS WILL CONTINUE THURSDAY THROUGH SUNDAY AS A STRONG LOW PRESSURE SYSTEM SLOWLY APPROACHES THE GREAT LAKES. THE BEST COVERAGE OF THUNDERSTORMS IS EXPECTED ON SATURDAY AND SUNDAY AS A COLD FRONT SWEEPS THROUGH THE STATE. THERE IS AGAIN A CHANCE FOR THUNDERSTORMS ON TUESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. LCZ422-423-460-LEZ444-LHZ421-422-441>443-462>464-310900- ST. CLAIR RIVER-DETROIT RIVER-LAKE ST. CLAIR- MICHIGAN WATERS OF LAKE ERIE-OUTER SAGINAW BAY-INNER SAGINAW BAY- PORT AUSTIN TO HARBOR BEACH MI-HARBOR BEACH TO PORT SANILAC MI- PORT SANILAC TO PORT HURON MI- LAKE HURON OFFSHORE BEYOND 5 NM FROM PORT AUSTIN TO HARBOR BEACH MI- LAKE HURON OFFSHORE BEYOND 5 NM FROM HARBOR BEACH TO PORT SANILAC MI- LAKE HURON OFFSHORE BEYOND 5 NM FROM PORT SANILAC TO PORT HURON MI- 500 AM EDT WED MAY 30 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR LAKE ST CLAIR...THE MICHIGAN WATERS OF LAKE ERIE AND LAKE HURON. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS ARE POSSIBLE THIS EVENING AND OVERNIGHT OVER SOUTHERN LAKE HURON...LAKE ST CLAIR...AND THE MICHIGAN WATERS OF LAKE ERIE. THESE THUNDERSTORMS ARE NOT EXPECTED TO BE SEVERE AS THEY MOVE FROM SOUTHWEST TO NORTHEAST AT AROUND 15 MPH. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY CHANCES FOR THUNDERSTORMS WILL CONTINUE THURSDAY THROUGH SUNDAY AS A STRONG LOW PRESSURE SYSTEM SLOWLY APPROACHES THE GREAT LAKES. THE BEST COVERAGE OF THUNDERSTORMS IS EXPECTED ON SATURDAY AND SUNDAY AS A COLD FRONT SWEEPS THROUGH THE STATE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. OROW YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
The Detroit radar (KDTX), 10 km away, was scanning. The volume nearest the first event began at 22:48 UTC.
2 thunderstorm wind. Local standard time, as filed.
A National Weather Service employee reported large tree branches down.
A trained spotter reported large tree branches down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2007Every state in 2007This day in weather historyWarnings in Michigan, May 2007
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: 35845, 35846.