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April 9, 1999
Blue Ash F4 Tornado

Animation shows WSR-88D radar reflectivity as tornadic thunderstorms move across Hamilton County, Ohio. Note how northern section of the storm developed rapidly over Northern Hamilton County and became the parent cell for the Blue Ash Tornado.
Red line indicates overall path of tornadic circulation, which produced several tornadoes. Fujita Scale values classify damage estimates along the path.
A plot of radar scan locations for the storm.
NWS Wilmington WSR-88D Doppler radar reflectivity four panel shows vertical structure of tornadic thunderstorm over Hamilton County at 4 different elevation angles. During severe weather, doppler radar products, spotter reports, and storm history help forecasters decide when to issue warnings.
NWS Wilmington WSR-88D Doppler radar storm relative velocity map (SRM) displays tornado vortex signature (TVS, red triangles) at four elevation cuts.

Timeline of NWS Warnings
Time Warning Type Location
4:02 AM Tornado Ripley County, Indiana
4:02 AM Tornado Ripley County, Indiana (retransmitted)
4:26 AM Tornado Dearborn County, Indiana
4:47 AM Severe Thunderstorm Owen County, Kentucky
4:52 AM Tornado Hamilton County, Ohio
4:54 AM Tornado Owen County, Kentucky
5:10 AM Tornado Grant County, Kentucky
5:18 AM Severe Thunderstorm Clermont County, Ohio
5:19 AM Tornado Warren County, Ohio
5:25 AM Tornado Pendleton County, Kentucky
5:36 AM Severe Thunderstorm Champagne County, Ohio
5:41 AM Tornado Clinton County, Ohio
5:45 AM Severe Thunderstorm Bracken County, Kentucky
5:51 AM Severe Thunderstorm Union County, Ohio
5:51 AM Severe Thunderstorm Union County, Ohio (retransmitted)
7:16 AM Severe Thunderstorm Fairfield County and Licking County, Ohio
11:26 AM Severe Thunderstorm Greene County, Ohio
11:50 AM Severe Thunderstorm Madison County, Ohio
11:55 AM Severe Thunderstorm Franklin County, Ohio
12:28 PM Severe Thunderstorm Licking County, Ohio

Images of the destruction across northern Hamilton County.
Photos courtesy Mary Jo Parker, NWS Wilmington Ohio.

  • Additional information on the Blue Ash tornado can be found
    on the Local Research page.

Approximate Track of the Blue Ash / Montgomery F4 Tornado

 NOTE: Marker locations are approximate and are not necessarily accurate to street level Show Pictures Show Track


PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
637 PM EDT FRI APR 9 1999

A PRELIMINARY REPORT ON THE STORMS IN THE TRI-STATE AREA.

A COMPLEX SYSTEM OF SEVERE THUNDERSTORMS OVER THE MISSOURI
VALLEY THURSDAY AFTERNOON MIGRATED INTO THE OHIO VALLEY LATE
THURSDAY EVENING AND FRIDAY MORNING...AND PRODUCED  SUBSTANTIAL
DAMAGE IN THE SOUTHWESTERN PORTION OF OHIO AND SOUTHEAST INDIANA. 
HARDEST HIT AREAS WERE BLUE ASH...MONTGOMERY AND LOVELAND...LOCATED 
NORTH THROUGH EAST OF CINCINNATI. NUMEROUS INJURIES HAVE BEEN 
REPORTED...AND AS MANY AS 9 UNCONFIRMED DEATHS ARE BEING BLAMED ON
THIS TORNADO.

PRELIMINARY INVESTIGATION BY NATIONAL WEATHER SERVICE PERSONNEL... 
INDICATED AN F3 TORNADO THAT INTENSIFIED BRIEFLY TO F4 WITH WINDS
IN EXCESS OF 200 MPH TOUCHED DOWN IN THE BLUE ASH AREA.  AT LEAST
200 HOMES WERE DEMOLISHED AND ANOTHER 400 WERE DAMAGED.  THE
WIDTH OF THIS STORM VARIED FROM AS LITTLE AS 400 FEET TO NEARLY
A MILE...WHILE THE ESTIMATED PATH OF THIS TORNADO WAS 6 TO 7 MILES.

SEVERAL EYEWITNESSES REPORTED HEARING SIRENS AND TOOK NECESSARY 
PROTECTIVE ACTION. ALSO...SEVERAL PEOPLE WHO ATTENDED WEATHER
SERVICE SPOTTER TRAINING...INDICATED THAT THE SEVERE WEATHER 
PREPAREDNESS PLANS DEVELOPED PROVED TO BE VALUABLE.

IT IS IMPORTANT TO REMEMBER THAT THIS IS A PRELIMINARY
INVESTIGATION AND FURTHER INFORMATION WILL BE FORTHCOMING.

TORRENCE


PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE WILMINGTON OH 215 AM EDT SAT APR 10 1999 A DAMAGE SURVEY WAS CONDUCTED BY WEATHER SERVICE AND LOCAL EMA OFFICIALS FRIDAY AFTERNOON IN CHAMPAIGN AND UNION COUNTIES IN CENTRAL OHIO. THE THUNDERSTORM MOVED EAST INTO CHAMPAIGN COUNTY AROUND 545 AM. THIS STORM MOVED INTO THE MIDDLETOWN AREA IN THE NORTHEAST PART OF THE COUNTY ABOUT 6 AM. AS IT MOVED THROUGH... NUMEROUS TREES WERE UPROOTED AND SOME STRUCTURAL DAMAGE OCCURRED TO A FEW HOUSES AND MOBILE HOMES. THE CONCENTRATION OF TORNADIC DAMAGE WAS BETWEEN STATE ROUTE 245 AND STATE ROUTE 296 NEAR MIDDLETOWN. THE PATH WAS A QUARTER-MILE WIDE AND A HALF-MILE LONG. BASED ON THE DAMAGE THE TORNADO WAS RATED AN F1 ON THE FUJITA SCALE. OTHER AREAS OF STRAIGHT-LINE THUNDERSTORM WIND DAMAGE ALSO OCCURRED IN THE AREA. THE STORM FOLLOWED CLOSE TO STATE ROUTE 245 AS IT MOVED INTO UNION COUNTY. NUMEROUS TREES WERE DOWNED ACROSS THE COUNTY. A BARN WAS ALSO BLOWN DOWN ON THE WEST SIDE OF MARYSVILLE. SOME OTHER MINOR STRUCTURAL DAMAGE OCCURRED TO HOUSES AND BARNS ON THE OUTSKIRTS OF MARYSVILLE. ALL OF THIS DAMAGE WAS THE RESULT OF STRAIGHT-LINE THUNDERSTORM WINDS. WHITE
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE WILMINGTON OHIO 459 PM EDT FRI APR 09 1999 TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS... ....COUNTY LOCATION.... 0420 AM REXVILLE IN TORNADO 04/09/99 RIPLEY 0444 AM AURORA IN TORNADO 04/09/99 DEARBORN 0450 AM REXVILLE IN TORNADO 04/09/99 RIPLEY 0500 AM AURORA IN TORNADO 04/09/99 DEARBORN 0540 AM OH WIND DAMAGE 04/09/99 WARREN STRUCTURAL DAMAGE TO INDUSTRIAL COMPLEX LOVELAND AND MONTGOMERY RD 0550 AM OH WIND DAMAGE 04/09/99 CLERMONT LARGE TREES DOWN NORTHERN PART OF COUNTY 0600 AM NORTH LEWISBURG OH WIND DAMAGE 04/09/99 CHAMPAIGN SEVERAL TREES DOWN/HOMES DAMAGED 0610 AM CLARKSVILLE OH WIND DAMAGE 04/09/99 CLINTON SEVEN HOUSES DAMAGED, TREES DOWN 0610 AM MARYSVILLE OH WIND DAMAGE 04/09/99 UNION TREES DOWN JUSTWEST OF MARYSVILLE ALONG SR 245 1215 PM COLUMBUS OH .75 INCH HAIL 04/09/99 FRANKLIN 1250 PM NEWARK OH 1 INCH HAIL 04/09/99 LICKING

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Wilmington Ohio Weather Forecast Office
1901 South State Route 134
Wilmington, OH 45177
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Page last modified: April 9, 2014.
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