A complex of storms moved through during the afternoon hours of August 10th producing damaging winds across the area.
Every event with a place to put it. Tap one for its entry below.
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 ILN wrote it up.
A complex of storms moved through during the afternoon hours of August 10th producing damaging winds across the area.
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 Wilmington, OH wrote its last area forecast discussion before the first event at Aug 10, 1:02 PM EST, 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 202 PM EDT MON AUG 10 2009 .SYNOPSIS... A SERIES OF UPPER DISTURBANCES WILL MOVE THROUGH THE AREA OVER THE NEXT FEW DAYS. THESE WILL HELP TO SLOWLY PUSH A COLD FRONT THROUGH THE OHIO VALLEY. && .NEAR TERM /UNTIL 11 PM THIS EVENING/... PRIMED ATMOSPHERE IS GOING AHEAD OF A SOUTEHAST DIVING OUTFLOW THAT IS MOST NOTABLE ON .5 REFLECTIVITY COMPOSITE. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO GET A KICK FROM THIS FEATURE AS IT MOVES SOUTHEAST. THIS WILL LIKELY SPARK ANY DEEPER CU IN THE AIR IMMEDIATELY AHEAD OF IT TO PRODUCE SHOWERS AND/OR SOME THUNDER. THE STORMS TO THE SOUTHEAST ARE FIRING ALONG WHAT APPEARS TO BE A SLIGHT CONVERGENT BOUNDARY AND WILL LIKELY DO SO FOR THE REMAINDER OF THE AFTERNOON UNTIL COLD AIR POOLING CUTS OFF ANY SURFACE INSTABILITY. ALL THAT BEING SAID...UPDATED FORECAST WAS TO TONE DOWN MAX TEMPS SLIGHTLY AND MELD PAST WX WITH CURRENT AND EXPECTED NEAR FUTURE TEMPS/DEWPOINTS/WINDS. THOUGHT THAT CURRENT POPS WERE MORE THAN REASONABLE AND NO CHANGES WERE MADE HERE. && .SHORT TERM /11 PM THIS EVENING THROUGH WEDNESDAY/... CONVECTION MAY STILL BE ONGOING AT THE BEGINNING OF THE PERIOD IN THE SOUTHERN ZONES. DIFFUSE COLD FRONT WILL PUSH INTO THE REGION DURING THE DAY WITH ADDITIONAL DEVELOPMENT POSSIBLE ALONG AND AHEAD OF IT. APPEARS THAT THE FRONT WILL MAKE IT ALL THE WAY THROUGH THE FORECAST AREA BY TUESDAY EVENING BEFORE STALLING. THERE IS THE POTENTIAL FOR A WAVE TO MOVE ALONG THE FRONT ON WEDNESDAY WHICH MAY BE IN CLOSE ENOUGH PROXIMITY TO BRING SOME FURTHER SHOWERS AND THUNDERSTORMS TO THE SOUTHEAST ZONES. CONTINUED TO FAVOR COOLER GUIDANCE FOR HIGHS. MOS WAS IN REASONABLE AGREEMENT FOR LOWS AND DID NOT VARY TOO MUCH FROM THE CONSENSUS. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... HIGH PRESSURE WILL BUILD OVER THE GREAT LAKES WEDNESDAY NIGHT AND THURSDAY AND THEN CONTINUE TO EXTEND ACROSS THE REGION INTO THE WEEKEND. THIS SHOULD RESULT IN DRY WEATHER AND TEMPERATURES AT OR SLIGHTLY ABOVE NORMAL. && .AVIATION /16Z MONDAY THROUGH FRIDAY/... POPCORN CONVECTION LOCATED ACROSS CWA THIS AFTERNOON IS GETTING A LITTLE BIT OF ENHANCEMENT NORTHWEST OF METRO DAYTON FROM AN OUTFLOW FROM MCS OVER WESTERN MI EARLIER THIS MORNING. EXPECT THIS LINE TO REMAIN ACTIVE AND THIS WAVE WILL CONTINUE TO MAKE ITS WAY SOUTH THIS AFTERNOON...GIVING A BIT OF ENHANCEMENT TO THE NEXT LINE IT ENCOUNTERS...CURRENTLY RUNNING ALONG THE I-75 CORRIDOR S AND I-71 CORRIDOR NE OF METRO CINCY. OCCASIONAL GUSTS IN THE WORST OF THESE STORMS WILL BE 30-35KT BUT THIS WILL BE THE EXCEPTION TO THE NORM OF ABOUT 20-25 KT. CIGS HAVE LIFTED TO VFR BUT SHOULD DROP BACK DOWN TO MVFR IN THE STORMS...WITH SOME HEAVIER STORMS PRODUCING VSBY AROUND A MILE WITH CIGS AROUND 1KFT. NAM IS SHOWING FORCING DRIVING SE OF FCST AREA LATER THIS AFTERNOON AND I AM BITING INTO THIS SCENARIO AND CLEARING THINGS OUT A LITTLE BEFORE 0Z TONIGHT. THINK THAT SOME SPOTS THAT GET A GOOD SHOT OF RAIN MAY MIX OUT ANY LINGERING LOW CLOUD COVER TONIGHT AND SEE SOME FOG DEVELOPMENT...BUT THIS SHOULD BE SOMEWHAT OF A HIT AND MISS SITUATION TONIGHT. AM NOT FAVORING ANY LINGERING SHOWERS TOMORROW...IF THEY OCCUR SHOULD BE SE OF I-71 CORRIDOR AND TAF SITES. OUTLOOK...NO SIGNIFICANT WEATHER EXPECTED. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. KY...NONE. IN...NONE. && SYNOPSIS... NEAR TERM...FRANKS SHORT TERM... LONG TERM... AVIATION...FRANKS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 500 AM EDT MON AUG 10 2009 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-110900- WAYNE-FAYETTE IN-UNION IN-FRANKLIN IN-RIPLEY-DEARBORN-OHIO- SWITZERLAND-CARROLL-GALLATIN-BOONE-KENTON-CAMPBELL-OWEN-GRANT- PENDLETON-BRACKEN-ROBERTSON-MASON-LEWIS-HARDIN-MERCER-AUGLAIZE-DARKE- SHELBY-LOGAN-UNION OH-DELAWARE-MIAMI-CHAMPAIGN-CLARK-MADISON- FRANKLIN OH-LICKING-PREBLE-MONTGOMERY-GREENE-FAYETTE OH-PICKAWAY- FAIRFIELD-BUTLER-WARREN-CLINTON-ROSS-HOCKING-HAMILTON-CLERMONT-BROWN- HIGHLAND-ADAMS-PIKE-SCIOTO- 500 AM EDT MON AUG 10 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL INDIANA...SOUTHEAST INDIANA...NORTHEAST KENTUCKY...NORTHERN KENTUCKY...CENTRAL OHIO...MIAMI VALLEY OF OHIO...SOUTH CENTRAL OHIO...SOUTHWEST OHIO AND WEST CENTRAL OHIO. .DAY ONE...TODAY AND TONIGHT. ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE TODAY. THE ATMOSPHERE IS FORECAST TO BECOME MODERATELY UNSTABLE TODAY WHICH WILL ALLOW SHOWERS AND THUNDERSTORMS TO FORM. IF THERE IS ENOUGH HEATING...THEN SOMEWHAT STRONGER INSTABILITY MAY DEVELOP IN SOME LOCATIONS. IF THIS OCCURS...THEN A COUPLE OF STORMS COULD BECOME SEVERE. DAMAGING WINDS WOULD BE THE PRIMARY THREAT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SINCE THE THREAT IS FORECAST TO BE ISOLATED...SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The Cincinnati radar (KILN), 58 km away, was scanning. The volume nearest the first event began at 18:36 UTC.
3 thunderstorm wind. Local standard time, as filed.
Forty trees were knocked down and siding was stripped off a home in the the area. Additionally, a power pole was knocked over and numerous power outages were reported.
Trees were reported down on power lines.
Parts of trees were reported down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2009Every state in 2009This day in weather historyWarnings in Ohio, August 2009
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: 190266, 190250, 190252.