Public Information Statement
Issued by NWS Buffalo, NY

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NOUS41 KBUF 150141
PNSBUF
NYZ014-150545-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
941 PM EDT MON JUL 14 2014

...DAMAGE IN GORHAM AND HOPEWELL IN ONTARIO COUNTY NEW YORK IS
LIKELY TO BE FROM A MICROBURST...

SHORTLY BEFORE 400 PM DOPPLER RADAR SHOWED ROTATION IN A
THUNDERSTORM LOCATED NEAR HOLCOMB IN ONTARIO COUNTY. MULTIPLE
RADAR SAMPLES CONFIRMED THIS ROTATION WHICH PROMPTED A TORNADO
WARNING TO BE ISSUED AT 357 PM TODAY.

THE THUNDERSTORM TRACKED EAST WITH RADAR CONTINUING TO SHOW
ROTATION ALOFT. THE STORM PASSED NEAR THE CITY OF CANANDAIGUA AND
THEN WEAKENED RAPIDLY IN EASTERN ONTARIO COUNTY AS IT ENCOUNTERED
ANOTHER THUNDERSTORM WHICH CUT OFF ITS INFLOW OF WARM MOIST AIR AND
CAUSED THE CORE ALOFT TO COLLAPSE. REPORTS RELAYED THROUGH SOCIAL
MEDIA SHOWED WHAT APPEARED TO BE A WALL CLOUD OR FUNNEL CLOUD IN
THE VICINITY OF CANANDAIGUA...BUT THESE PICTURES DID NOT INDICATE
THAT IT TOUCHED DOWN.

JUST EAST OF CANANDAIGUA THERE WAS A COUPLE TREES DAMAGED IN
HOPEWELL...AND A CORN FIELD WAS FLATTENED IN THE TOWN OF GORHAM.
PICTURES OF THIS DAMAGE SHOWS CORN STALKS WERE BLOWN DOWN IN A
UNIDIRECTIONAL MANOR WHICH IS CONSISTENT WITH A MICROBURST. THIS
IS ALSO SUPPORTED BY RADAR EVIDENCE WHICH SHOWED THE CORE OF THE
STORM COLLAPSING JUST BEFORE IT REACHED HOPEWELL AND GORHAM.

AT THIS TIME...THE NATIONAL WEATHER SERVICE IN BUFFALO IS NOT PLANNING AN
ON-SITE TORNADO DAMAGE SURVEY. HOWEVER...IT IS STILL POSSIBLE THERE
WAS DAMAGE IN RURAL LOCATIONS WHICH HAS YET TO BE REPORTED...AND
ADDITIONAL REPORTS COULD STILL PROMPT A SURVEY.

FOR REFERENCE...A MICROBURST IS A CONVECTIVE DOWNDRAFT WITH AN
AFFECTED OUTFLOW AREA OF LESS THAN 2 1/2 MILES WIDE AND PEAK WINDS
LASTING LESS THAN 5 MINUTES. MICROBURSTS MAY INDUCE DANGEROUS
HORIZONTAL/VERTICAL WIND SHEARS...WHICH CAN ADVERSELY AFFECT
AIRCRAFT PERFORMANCE AND CAUSE PROPERTY DAMAGE. STRAIGHT-LINE
WINDS ARE GENERALLY ANY WIND THAT IS NOT ASSOCIATED WITH
ROTATION...USED MAINLY TO DIFFERENTIATE THEM FROM TORNADIC WINDS.

$$

APFFEL




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