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April 9, 1999
Blue Ash F4 Tornado
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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. |
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Red line indicates path of tornado damage. Fujita Scale values classify damage estimates along the path. |
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A plot of radar scan locations for the storm. |
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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. |
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NWS Wilmington WSR-88D Doppler radar storm relative velocity map (SRM) displays tornado vortex signature (TVS, red triangles) at four elevation cuts. |
Images of the destruction across northern Hamilton County.
Photos courtesy Mary Jo Parker, NWS Wilmington Ohio. |
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- Additional information on the Blue Ash tornado can be found
on the Local Research page.
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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
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
452 AM EDT FRI APR 9 1999
THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A
* TORNADO WARNING FOR...
HAMILTON COUNTY IN SOUTHWESTERN OHIO.
* UNTIL 555 AM EDT
* AT 450 AM EDT... WEATHER SPOTTERS INDICATED A TORNADO 17 MILES
WEST OF CINCINNATI OR 6 MILES SOUTHWEST OF HOOVEN... MOVING EAST
AT 35 MPH.
* THE TORNADO IS EXPECTED TO BE NEAR...
CHEVIOT AT 512 AM EDT .
MT HEALTHY AT 519 AM EDT .
CINCINNATI AT 520 AM EDT .
A TORNADO IS ON THE GROUND! GO TO THE BASEMENT! IF A BASEMENT IS
NOT AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR!
.END/SITES
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
519 AM EDT FRI APR 9 1999
THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A
* TORNADO WARNING FOR...
WARREN COUNTY IN SOUTHWESTERN OHIO.
* UNTIL 620 AM EDT
* AT 517 AM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A TORNADO 14 MILES SOUTHWEST OF LEBANON... MOVING EAST AT 35 MPH.
* THE TORNADO IS EXPECTED TO BE NEAR...
LOVELAND PARK AT 527 AM EDT .
THIS STORM HAS HAD A HISTORY OF PRODUCING TORNADOES IN RIPLEY AND
DEARBORN COUNTIES IN INDIANA.
GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR!
.END/SITES
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www.nws.noaa.gov
