NOUS41 KBUF 230952
PNSBUF
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
550 AM EDT TUE OCT 23 2001
...NATIONAL WEATHER SERVICE SURVEYS THUNDERSTORM DAMAGE...
A NATIONAL WEATHER SERVICE METEOROLOGIST INSPECTED THE DAMAGE FROM A
SEVERE THUNDERSTORM THAT MOVED THROUGH THE FRANKLINVILLE AREA IN
EASTERN CATTARAUGUS COUNTY LATE SUNDAY.
THIS PARTICULAR SEVERE THUNDERSTORM WAS PART OF A BOWING LINE OF
STRONG TO SEVERE THUNDERSTORMS THAT RACED EAST FROM FROM LAKE ERIE
ACROSS CHAUTAUQUA...CATTARAUGUS AND ALLEGANY COUNTIES LATE SUNDAY
AFTERNOON.
THE DAMAGING WINDS FROM THIS SEVERE THUNDERSTORM PRODUCED
SIGNIFICANT STRUCTURAL DAMAGE TO A BARN ON ABBOTT ROAD IN THE TOWN
OF LYNDON. PORTIONS OF A ROOF WERE RIPPED OFF THE DAIRY BARN WITH
NEARLY A DOZEN 1000 POUND BALES OF HAY BLOWN OUT OF THE UPPER
PORTIONS OF THE BARN. THE PIECES OF THE BARN ROOF WERE STREWN SOME
150 YARDS TO THE EAST OF THE BARN INTO A NEARBY MEADOW. WIND SPEEDS
OF 80 MILES AN HOUR WERE ESTIMATED FROM THIS EVENT.
AN EYEWITNESS TO THE EVENT REPORTED AN EERIE GREENISH SKY PRIOR TO
THE STORM...WHICH WAS FOLLOWED BY AN APPROACHING 'WHITE CYLINDER'
FROM THE WEST. THE SHAPE 'WAS NOT OF A CONE...BUT MORE OF A
CYLINDER'. A BIT OF SMALL HAIL IMMEDIATELY PRECEEDED THE CYLINDER
THEN 'THE WIND AND HAIL ALL HIT AT ONCE'.
THE HAIL WAS GENERALLY DIME SIZED AND COVERED THE GROUND. THE HIGH
WIND DRIFTED THE HAIL TO A DEPTH OF ONE TO TWO FEET ON THE WEST SIDE
OF THE BARN...WITH SOME OF THE HAIL STILL INTACT NEARLY 24 HOURS
LATER.
THE DESCRIPTION OF THE 'WHITE CYLINDER'...COUPLED WITH THE TIMING OF
THE ONSET OF THE HIGH WINDS AND BURST OF HAIL...ARE AN INDICATION
THAT A HAIL SHAFT ACCOMPANIED THE DOWNBURST WINDS.
THE OBSERVED WEST TO EAST STRAIGHT LINE DAMAGE PATTERN WAS
CONSISTENT WITH RADAR SIGNATURES OF PROBABLE DOWNBURST WINDS
ASSOCIATED WITH BOW ECHOES.
RSH
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