Thunderstorms developed and moved westward across parts of the the Ohio Valley ahead of a wave of low pressure during the evening. Some of these storms became organized, producing a threat of damaging winds and isolated sub severe hail.
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.
Thunderstorms developed and moved westward across parts of the the Ohio Valley ahead of a wave of low pressure during the evening. Some of these storms became organized, producing a threat of damaging winds and isolated sub severe hail.
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 Sep 21, 7:18 PM EST, 17 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 818 PM EDT FRI SEP 21 2012 .SYNOPSIS... A WAVE OF LOW PRESSURE WILL TRACK NORTHEAST THROUGH THE OHIO VALLEY TONIGHT. RAIN WILL OVERSPREAD THE REGION AHEAD OF THIS SYSTEM TONIGHT. THE LOW WILL TRACK NORTHEAST OF THE REGION ON SATURDAY WITH COLDER AIR MOVING IN FOR SATURDAY AND SUNDAY. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... PCPN CONTINUES TO DEVELOP OUT ACROSS INDIANA AND IL AHEAD OF DEEPENING LOW PRESSURE. MODELS HAVE COME INTO BETTER ALIGNMENT WITH THE SYSTEM AS THE BRING THE SFC LOW OUT OF SRN IL...ACROSS CNTRL IL AND THEN ACROSS THE NW PORTION OF THE FA. BEST PCPN IS EXPECTED NW OF ABOUT A RID-DAY-CMH LINE...WITH IT SWINGING INTO THE NW AROUND 00Z...PEAKING AROUND 03Z...THEN EXITING QUICKLY AFTER 06Z. WENT 100 POPS ACROSS THE NW...AND TAPERED DOWN TO CHANCE POPS IN THE S. LIMITED THE MENTION OF THUNDER TO THE NW FOR TONIGHT...BASED ON CURRENT RADAR LOOP OUT OF IN/IL. LOWS SHOULD RANGE FROM THE UPPER 40S ACROSS THE NW COUNTIES....BUT STAYING AROUND 60 IN THE EXTREME SE COUNTIES. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH SUNDAY NIGHT/... A STRONG S/W WILL SWING AROUND THE BASE OF A DEEP H5 LOW ON SATURDAY. THIS SHOULD HELP KICK OFF INSTABILITY SHOWERS ON SATURDAY. THE BEST CHANCE WILL BE ACROSS THE NRN HALF OF THE FA. AS THE ENERGY WORKS E...THE PCPN SHOULD END QUICKLY SATURDAY NIGHT. A LARGE CANADIAN HIGH...BEGINS TO BUILD IN SATURDAY NIGHT. 0C AIR AT H8 REACHES EXTREME NW OHIO BY SUNDAY MORNING...BUT WITH SOME NW FLOW AT THE SFC...LOWS SHOULD STAY MAINLY IN THE 40S. THE HIGH CONTINUES TO SETTLE IN SUNDAY INTO SUNDAY NIGHT. WITH THE COLD AIR ALOFT...CU SHOULD POP ON SUNDAY...WITH BETTER COVERAGE ACROSS THE N. MODELS TRY AND BRING THE CENTER OF THE HIGH DOWN ACROSS THE FA ON SUNDAY NIGHT. 0C AIR AT H8 SETTLES ACROSS THE FA SUNDAY NIGHT. EXPECT LOWS TO DROP INTO MID TO UPPER 40S. ADDED A MENTION FROST FOR SUNDAY NIGHT. WILL ADD A MENTION IN THE HWO OF FROST. && .LONG TERM /MONDAY THROUGH FRIDAY/... THE COOLEST MORNING OF THE FORECAST WILL START OFF THE PERIOD UNDER CLEAR SKIES IN CLOSE PROXIMITY TO A SURFACE HIGH PRESSURE OVER KENTUCKY. HIGHS SHOULD BE A HANDFUL OF DEGREES WARMER THAN SUNDAY AS RETURN FLOW SETS UP AND SKIES REMAIN GENERALLY CLEAR. THIS PART OF THE FORECAST MAY NEED TO BE BUMPED UP IF FULL SUN IS EXPECTED. THE RETURN FLOW OVERNIGHT WILL NECESSITATE A SLIGHT CHANCE OF SHOWERS TOWARDS DAYBREAK TUESDAY DUE TO MOISTURE POOLING AHEAD OF THE NEXT COLD FRONT THAT IS SLATED TO CROSS THE REGION FROM NORTHWEST TO SOUTHEAST ON WEDNESDAY. INCREASED CHANCES OF RAIN WILL BE FOUND THROUGH EARLY THURSDAY AS THE FRONT STALLS ALONG THE OHIO RIVER WEDNESDAY NIGHT. HIGH PRESSURE BUILDING IN THE GREAT LAKES DURING THIS TIME FRAME WILL LIKELY PUSH THE MOISTURE AND ASSOCIATED RAIN CHANCES OUT QUICKER...BUT DIFFERING MODEL SOLUTIONS HAD ME LINGER POPS A LITTLE LONGER. CLOUD COVER AND THE NORTHERLY FLOW SUGGESTS A COOLER EXTENDED PERIOD AS WELL...DROPPED READINGS A LITTLE AND FEEL THE TREND WILL BE TO DROP THEM FURTHER AS TIME GOES ON. && .AVIATION /00Z SATURDAY THROUGH WEDNESDAY/... A LOW PRESSURE SYSTEM WILL MOVE ACROSS THE TAF SITES TONIGHT. ALTHOUGH THUNDERSTORM ACTIVITY IS EXPECTED TO DECREASE TONIGHT SHOWERS WILL IMPACT ALL THE TAF SITES. MVFR TO IFR VSBYS WILL BE POSSIBLE WITH SOME OF THE HEAVIER RAIN. ADDED TSRA INTO ONLY KDAY AT THIS TIME HOWEVER THIS MAY HAVE TO BE ADDED IN AT ADDITIONAL TAF SITES IF THE AREA OF STORMS MAINTAINS ITS CURRENT STRENGTH. RAIN WILL TAPER OFF LATER TONIGHT. LOW LEVEL MOISTURE WILL BE PRESENT ACROSS THE AREA AND THEREFORE SOME MVFR CIGS AND VSBYS WILL BE POSSIBLE. CONDITIONS WILL IMPROVE TO VFR DURING THE DAY. WINDS WILL PICK UP AND BECOME GUSTY FOR THE AFTERNOON AND INTO THE EARLY EVENING HOURS ON SATURDAY WITH CU PRESENT ACROSS THE AREA. WINDS WILL BEGIN TO DECREASE AND SKIES WILL CLEAR OUT BY THE END OF THE TAF PERIOD. .OUTLOOK...NO SIGNIFICANT WEATHER IS EXPECTED. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. KY...NONE. IN...NONE. && SYNOPSIS...SITES NEAR TERM...SITES SHORT TERM...SITES LONG TERM...FRANKS AVIATION...NOVAK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 725 PM EDT FRI SEP 21 2012 INZ075-080-KYZ089>100-OHZ026-034-035-043>046-051>056-061>065-071>074- 078>082-088-222330- OHIO-SWITZERLAND-CARROLL-GALLATIN-BOONE-KENTON-CAMPBELL-OWEN-GRANT- PENDLETON-BRACKEN-ROBERTSON-MASON-LEWIS-HARDIN-MERCER-AUGLAIZE- SHELBY-LOGAN-UNION OH-DELAWARE-MIAMI-CHAMPAIGN-CLARK-MADISON- FRANKLIN OH-LICKING-MONTGOMERY-GREENE-FAYETTE OH-PICKAWAY-FAIRFIELD- WARREN-CLINTON-ROSS-HOCKING-CLERMONT-BROWN-HIGHLAND-ADAMS-PIKE- SCIOTO- 725 PM EDT FRI SEP 21 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST INDIANA...NORTHEAST KENTUCKY...NORTHERN KENTUCKY...CENTRAL OHIO...MIAMI VALLEY OF OHIO...SOUTH CENTRAL OHIO...SOUTHWEST OHIO AND WEST CENTRAL OHIO. .DAY ONE...TONIGHT. HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. TEMPERATURES SUNDAY NIGHT WILL FALL INTO THE MID TO UPPER 30S OVER A GOOD PORTION OF THE AREA. WITH CLEAR SKIES AND LIGHT WINDS...FROST DEVELOPMENT IS EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. INZ050-058-059-066-073-074-OHZ042-060-070-077-222330- WAYNE-FAYETTE IN-UNION IN-FRANKLIN IN-RIPLEY-DEARBORN-DARKE-PREBLE- BUTLER-HAMILTON- 725 PM EDT FRI SEP 21 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL INDIANA...SOUTHEAST INDIANA...MIAMI VALLEY OF OHIO AND SOUTHWEST OHIO. .DAY ONE...TONIGHT. ISOLATED STRONG TO SEVERE STORMS WILL BE POSSIBLE THIS EVENING. THE MAIN TREATS ARE DAMAGING WINDS AND LARGE HAIL. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. TEMPERATURES SUNDAY NIGHT WILL FALL INTO THE MID TO UPPER 30S OVER A GOOD PORTION OF THE AREA. WITH CLEAR SKIES AND LIGHT WINDS...FROST DEVELOPMENT IS EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
809 PM EDT FRI SEP 21 2012
INZ050-058-059-066-OHZ042-043-051-060-070-220115-
UNION IN-FRANKLIN IN-FAYETTE IN-WAYNE IN-BUTLER OH-DARKE OH-MIAMI OH-
PREBLE OH-SHELBY OH-
809 PM EDT FRI SEP 21 2012
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHWESTERN SHELBY...
PREBLE...NORTHWESTERN MIAMI...DARKE...NORTHWESTERN BUTLER...WAYNE...
FAYETTE...NORTHERN FRANKLIN AND UNION COUNTIES THROUGH 915 PM EDT...
AT 803 PM EDT...RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE
EXTENDING FROM ROSE HILL TO GREENS FORK TO ANDERSONVILLE...MOVING
EAST AT 40 MPH.
WIND GUSTS FROM 40 TO 50 MPH ARE POSSIBLE WITH THESE STORMS.
IN ADDITION...HEAVY RAIN CAN BE EXPECTED WITH THESE STORMS.
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...ANSONIA...RICHMOND...
NEW PARIS...GREENVILLE...NEW MADISON...LIBERTY...VERSAILLES...
ARCANUM...BRADFORD...WEST COLLEGE CORNER...EATON AND LEWISBURG.
ALSO...SPRINGERSVILLE...SPRING GROVE...NORTH STAR...PALESTINE...
MIDDLEBORO...ABINGTON...ALQUINA AND EVERTON ARE NEAR THE PATH OF THIS
LINE OF STRONG THUNDERSTORMS.
WATER WILL POND ON ROADS AND MAY QUICKLY FILL ROADSIDE DITCHES AND
SMALL STREAMS.
LAT...LON 3979 8531 3980 8523 4000 8521 4001 8482
4033 8481 4033 8422 3992 8449 3946 8472
3946 8530
SNYDERThe Cincinnati radar (KILN), 95 km away, was scanning. The volume nearest the first event began at 00:33 UTC.
11 thunderstorm wind, 1 hail. Local standard time, as filed.
A large chicken barn was blown over as well as trees and power lines downed south of New Madison due to thunderstorm winds.
Three trees were damaged near West Manchester due to thunderstorm winds. A vehicle, car port, fence, and two houses also sustained damage.
Trees were reported down near Highway 722 due to thunderstorm winds.
Several trees were downed along Old Troy Pike due to thunderstorm winds.
At least four trees were downed in Urbana due to thunderstorm winds. Structural damage also occurred to a house.
Trees were downed near Hilliard due to damaging thunderstorm winds.
A tree was downed in Liberty Township due to damaging thunderstorm winds.
Tree branches were downed and a tree was split in half near Worthington due to damaging thunderstorm winds.
Tree limbs were downed in the area of Westerville due to thunderstorm winds.
A tree was downed near Center Village due to thunderstorm winds.
A tree fell onto power lines and caught fire in Hartford due thunderstorm winds.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2012Every state in 2012This day in weather historyWarnings in Ohio, September 2012
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: 411945, 411946, 411940, 411943, 411944, 411955, 411942, 411947, 411941, 411948, 411949, 411950.