An upper level disturbance in northwest flow aloft produced an area of showers and thunderstorms. Some of these storms produced damaging winds.
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.
An upper level disturbance in northwest flow aloft produced an area of showers and thunderstorms. Some of these storms produced damaging winds.
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 21, 8:08 PM EST, 1 hour 44 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 908 PM EDT THU AUG 21 2014 .SYNOPSIS... DISTURBANCES IN NORTHWEST FLOW ALOFT WILL INTERACT WITH A VERY WARM AND MOIST AIRMASS TO PRODUCE SHOWERS AND THUNDERSTORMS AT TIMES OVER THE NEXT FEW DAYS. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... A COMPLEX OF SHOWERS AND THUNDERSTORMS OVER NORTHERN INDIANA WILL MOVE INTO THE FA OVERNIGHT. INCREASED PRECIPITATION CHANCES ACROSS A LARGE PORTION OF THE FA. SOME OF THESE STORMS MAY BE SEVERE WITH DAMAGING WINDS AND LARGE HAIL THE PRIMARY THREATS. THE BEST CHANCE FOR SEVERE WEATHER WILL BE ACROSS WESTERN AND NW PORTIONS OF THE FA. THESE STORMS WILL ALSO PRODUCE HEAVY DOWNPOURS AND THEREFORE FLOODING CONCERNS WILL HAVE TO BE WATCHED AS WELL. ADJUSTED TEMPERATURES DOWNWARD A FEW DEGREES ACROSS THE FA TO ACCOUNT FOR THE RAIN COOLED AIR AS THIS SYSTEM WORKS INTO THE REGION. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/... STORMS SHOULD BE ONGOING AT THE BEGINNING OF PERIOD AS H5 S/W DROPS SE IN THE NW FLOW. INITIAL CONVECTION SHOULD DROP SE DURING THE MORNING...THEN ADDITIONAL CONVECTION SHOULD DEVELOP TO THE NW AND WORK DOWN INTO THE FA DURING THE AFTN. WENT LIKELY POPS FOR THE MAJORITY OF THE FA...THE EXCEPTION BEING THE EXTREME SW CORNER...WHERE KEPT THE POPS IN THE CHANCE CATEGORY. FRIDAY NIGHT...THE MODELS ARE IN AGREEMENT IN SHARPENING THE RIDGE OVER THE MIDDLE OF THE COUNTRY. THIS SHOULD ALLOW THE PCPN TO PUSH S OF THE REGION FOR THE MIDDLE PART OF FRIDAY NIGHT. CONVECTION WILL BE POSSIBLE AGAIN SATURDAY UNDER THE UPPER RIDGE. SOUTHERN PORTIONS OF THE FA WILL HAVE THE BETTER CHANCES. ANY CONVECTION THAT DEVELOPS SATURDAY SHOWED DIE DOWN DURING THE SATURDAY EVENING HOURS. FRIDAY AND SATURDAY WILL LIKELY BE THE WARMEST DAYS OF THE PERIOD WITH HIGHS IN THE UPPER 80S TO LOWER 90S. HEAT INDICES IN THE SOUTHWEST WILL BE NEAR 100. OVERNIGHT LOWS FRIDAY NIGHT WILL CONTINUE TO RESIDE ON EITHER SIDE OF 70....WITH SLIGHTLY COOLER AIR TRYING TO WORK INTO THE NORTH SATURDAY NIGHT. && .LONG TERM /SUNDAY THROUGH THURSDAY/... UPPER LEVEL FLOW WILL CONTINUE TO AMPLIFY THROUGH EARLY NEXT WEAK AS THE STRENGTHENING RIDGE BUILDS NORTHEASTWARD INTO THE GREAT LAKES REGION. WITH OUR AREA STILL ON THE PERIPHERY OF THE HIGH...WE COULD SEE A LOW END CHANCE OF POPS CONTINUE FOR SUNDAY. THERE DOES NOT APPEAR TO BE A WHOLE LOT IN THE WAY OF FORCING...BUT WE WILL BE ON THE EDGE OF THE INSTABILITY GRADIENT SO SUPPOSE THIS COULD ALLOW FOR SOMETHING TO DROP DOWN SOUTHEAST ACROSS OUR AREA. WILL THEREFORE ALLOW FOR A SLIGHT CHANCE OF THUNDERSTORMS ON SUNDAY...PRIMARILY DURING THE MORE DIURNALLY FAVORABLE AFTERNOON/EARLY EVENING HOURS. AS THE UPPER LEVEL RIDGE BUILDS ACROSS OUR AREA MONDAY...BETTER INSTABILITIES WILL WORK MORE EAST NORTHEASTWARD ACROSS OUR AREA TOO. HOWEVER...WITH WARMING IN THE MID LEVELS AND A CONTINUED LACK OF FORCING...THINK ANY THUNDERSTORM ACTIVITY WILL REMAIN ISOLATED ENOUGH TO LEAVE MENTION OUT OF THE FORECAST. THE UPPER LEVEL RIDGE WILL SLOWLY BEGIN TO FLATTEN OUT THROUGH MID TO LATE IN THE WEEK AS SHORT WAVE ENERGY PUSHES ACROSS THE GREAT LAKES. THIS WILL EVENTUALLY HELP DRIVE A COLD FRONT DOWN TOWARD OUR AREA LATE IN THE WORK WEEK. THIS WILL LEAD TO AN INCREASING CHANCE OF SHOWERS AND THUNDERSTORMS FROM THE NORTHWEST WEDNESDAY INTO THURSDAY. TEMPERATURES WILL REMAIN ON THE WARM SIDE THROUGH MID WEEK...WITH HIGHS GENERALLY IN THE UPPER 80S TO NEAR 90...BEFORE A POSSIBLE COOL DOWN WITH THE APPROACH OF THE FRONT ON THURSDAY. && .AVIATION /01Z FRIDAY THROUGH TUESDAY/... SHOWERS AND THUNDERSTORMS HAVE DEVELOPED OVER NORTHERN INDIANA THIS EVENING. EXPECT THIS AREA OF SHOWERS AND THUNDERSTORMS TO MOVE SOUTHEAST INTO THE TAF SITES THIS EVENING INTO TONIGHT. HAVE SHRA AND VCTS MENTION AT ALL TAF SITES FOR A TIME TONIGHT. ONLY HAVE TSRA MENTION IN AT KDAY DUE TO GREATER CONFIDENCE AT THAT LOCATION. AFTER THIS AREA OF STORMS MOVES THROUGH THE AREA EXPECT A LULL IN THE HEAVIER PRECIPITATION AND TO ACCOUNT FOR THIS HAVE A VCSH MENTION IN THE TAFS. ANOTHER DISTURBANCE IS EXPECTED TO WORK INTO THE AREA DURING THE DAY ON FRIDAY BRINGING ADDITIONAL SHOWERS AND THUNDERSTORMS TO THE AREA. BY LATER IN THE AFTERNOON EXPECT ANOTHER LULL BEFORE A THIRD ROUND OF SHOWERS AND STORMS BEGINS TO MOVE INTO THE WESTERN TAF SITES. THERE IS STILL SOME UNCERTAINTY IN THE EXACT TIMING OF THESE ROUNDS OF THUNDERSTORMS HOWEVER CONFIDENCE IS HIGHER THAT MULTIPLE ROUNDS OF THUNDERSTORMS WILL MOVE THROUGH THE TAF SITES THROUGH THE TAF PERIOD. VBYS WILL BE REDUCED AT TIMES IN SOME OF THE THUNDERSTORM ACTIVITY. CIGS ARE ALSO EXPECTED TO BE REDUCED TO THE MVFR CATEGORY ACROSS MUCH OF THE AREA LATE IN THE OVERNIGHT HOURS INTO THE MORNING DAYTIME HOURS ON FRIDAY. OUTLOOK...THUNDERSTORMS POSSIBLE FRIDAY EVENING THROUGH SATURDAY. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. KY...NONE. IN...NONE. && SYNOPSIS...SITES/SNYDER NEAR TERM...NOVAK SHORT TERM...SITES LONG TERM...JGL AVIATION...NOVAK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 521 AM EDT THU AUG 21 2014 INZ050-058-059-066-KYZ100-OHZ026-034-035-042>046-051>056-060>065- 070>074-080>082-088-220930- WAYNE-FAYETTE IN-UNION IN-FRANKLIN IN-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-HIGHLAND-ADAMS-PIKE- SCIOTO- 521 AM EDT THU AUG 21 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL INDIANA...SOUTHEAST INDIANA...NORTHEAST KENTUCKY...CENTRAL OHIO...MIAMI VALLEY OF OHIO...SOUTH CENTRAL OHIO...SOUTHWEST OHIO AND WEST CENTRAL OHIO. .DAY ONE...TODAY AND TONIGHT. THUNDERSTORMS WILL LIKELY MOVE INTO THE REGION TONIGHT. ALTHOUGH CONFIDENCE IS LOW IN THE TIMING AND PLACEMENT OF THE STORMS...THERE IS A RISK OF A FEW STRONG TO DAMAGING WIND GUSTS IF THE STORMS ARE WELL ORGANIZED AS THEY ENTER THE AREA. THE STORMS WILL ALSO BE CAPABLE OF PRODUCING HEAVY RAIN...WHICH MAY COMBINE WITH THE EFFECTS OF RECENT STORMS TO CAUSE LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. A VERY WARM AND HUMID AIRMASS WILL BE IN PLACE FRIDAY AND SATURDAY. HEAT INDICES IN THE MID TO UPPER 90S WILL BE POSSIBLE EACH AFTERNOON. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. INZ073>075-080-KYZ089>099-OHZ077>079-220930- RIPLEY-DEARBORN-OHIO-SWITZERLAND-CARROLL-GALLATIN-BOONE-KENTON- CAMPBELL-OWEN-GRANT-PENDLETON-BRACKEN-ROBERTSON-MASON-HAMILTON- CLERMONT-BROWN- 521 AM EDT THU AUG 21 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST INDIANA...NORTHEAST KENTUCKY...NORTHERN KENTUCKY...SOUTH CENTRAL OHIO AND SOUTHWEST OHIO. .DAY ONE...TODAY AND TONIGHT. THUNDERSTORMS WILL LIKELY MOVE INTO THE REGION TONIGHT. ALTHOUGH CONFIDENCE IS LOW IN THE TIMING AND PLACEMENT OF THE STORMS...THERE IS A RISK OF A FEW STRONG TO DAMAGING WIND GUSTS IF THE STORMS ARE WELL ORGANIZED AS THEY ENTER THE AREA. THE STORMS WILL ALSO BE CAPABLE OF PRODUCING HEAVY RAIN...WHICH MAY COMBINE WITH THE EFFECTS OF RECENT STORMS TO CAUSE LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. A VERY WARM AND HUMID AIRMASS WILL BE IN PLACE FROM FRIDAY THROUGH MONDAY. HEAT INDICES NEAR 100 WILL BE POSSIBLE ON FRIDAY AND SATURDAY...AND IN THE MID TO UPPER 90S ON SUNDAY AND MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
1046 PM EDT THU AUG 21 2014
INZ050-058-059-OHZ042-060-220330-
UNION IN-FAYETTE IN-WAYNE IN-DARKE OH-PREBLE OH-
1046 PM EDT THU AUG 21 2014
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT PREBLE...SOUTHEASTERN
DARKE...SOUTHERN WAYNE...FAYETTE AND UNION COUNTIES THROUGH 1130 PM
EDT...
AT 1043 PM EDT...RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE
EXTENDING FROM EAST GERMANTOWN TO 8 MILES NORTHWEST OF FALMOUTH...
MOVING SOUTHEAST AT 35 MPH.
STORM HAZARDS INCLUDE...
WINDS TO 50 MPH...
PEA SIZE HAIL...
FREQUENT CLOUD TO GROUND LIGHTNING...
VERY HEAVY RAIN...
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...CENTERVILLE...
RICHMOND...NEW PARIS...CONNERSVILLE...LIBERTY...LEWISBURG...EATON...
WEST COLLEGE CORNER AND CAMDEN.
ALSO...BENTONVILLE...FALMOUTH...BEESONS...SPRING GROVE...
MIDDLEBORO...PHILOMATH...METTEL FIELD...WATERLOO...ABINGTON AND
GLENWOOD ARE NEAR THE PATH OF THIS LINE OF STRONG THUNDERSTORMS.
DO NOT STAY IN THE OPEN NOR SEEK SHELTER UNDER TREES WHEN LIGHTNING
THREATENS. MOVE INDOORS WHEN THUNDERSTORMS APPROACH. WATER WILL POND
ON ROADS AND MAY QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.
LAT...LON 3978 8530 3979 8523 3985 8523 3996 8450
3962 8448 3954 8493 3953 8529 3954 8531The Cincinnati radar (KILN), 103 km away, was scanning. The volume nearest the first event began at 02:51 UTC.
1 thunderstorm wind. Local standard time, as filed.
One tree was knocked down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2014Every state in 2014This day in weather historyWarnings in Ohio, August 2014
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: 532229.