Public Information Statement
Issued by NWS

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NOUS41 KPBZ 122148
PNSPBZ
MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-
020>023-029-031-073>076-WVZ001>004-012-021>023-041-130200-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
548 PM EDT THU JUN 12 2014

...DOWNBURST /STRAIGHT LINE WIND DAMAGE/ CONFIRMED NEAR
LISBON IN COLUMBIANA COUNTY OHIO...

LOCATION...IN AND NEAR LISBON IN COLUMBIANA COUNTY OHIO
DATE...JUNE 11 2014
ESTIMATED TIME...458 PM TO 505 PM EDT
ESTIMATED MAXIMUM WIND SPEED...80 MPH
MAXIMUM PATH WIDTH...0.7 MILES
PATH LENGTH... AT LEAST 3 MILES
BEGINNING LAT/LON... 40.759N   80.787W
ENDING LAT/LON... 40.788N   80.769W
* FATALITIES...0
* INJURIES...0

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT(S) AND PUBLICATION IN
NWS STORM DATA.

...SUMMARY...
THE NATIONAL WEATHER SERVICE IN PITTSBURGH PA HAS CONFIRMED A
DOWNBURST /STRAIGHT LINE WIND DAMAGE/ NEAR LISBON IN COLUMBIANA
COUNTY OHIO ON JUNE 11 2014.

DAMAGE TO TREES BEGAN ALONG STATE ROUTE 164 SOUTHWEST OF LISBON...
WHERE RADAR INDICATED THE DEVELOPMENT OF DIVERGENT WIND AND THE
DEBRIS FIELD EXHIBITED A DIVERGENT PATTERN. IN THIS LOCATION...
NUMEROUS TREES WERE UPROOTED AND LARGE LIMBS WERE SNAPPED.

IN LISBON...THE WIND CAUSED WIDESPREAD DIRECT DAMAGE PRIMARILY TO
TREES. NUMEROUS TREES WERE UPROOTED AND SNAPPED...ESPECIALLY IN
THE WESTERN SIDE OF THE CITY NEAR CHESTNUT AND CEDAR STREETS. NEAR
THIS INTERSECTION...THE TERRAIN OF A RAVINE APPEARS TO HAVE
ENHANCED WIND SPEEDS LOCALLY AND RESULTED IN THE MOST SIGNIFICANT
OBSERVED DAMAGE. ALSO NEARBY...A METAL ROOF COVERING WAS BLOWN
COMPLETELY OFF A SECTION OF A STURDY VICTORIAN HOME. OCCASIONAL
DAMAGE TO FASCIA AND ROOF RIDGE CAPS WAS NOTED THROUGHOUT THE
CITY. WITNESSES IN TOWN RECOUNTED A DESCENDING DARK COLUMN FROM
THE CLOUD TYPICAL OF A MICROBURST JUST PRIOR TO THE ONSET OF
RAIN...HAIL AND DAMAGING WIND. NUMEROUS RESIDENTS WERE DISPLACED
WHEN TREES FELL ON THEIR HOMES.

IN LIGHT OF THE DIVERGENT DEBRIS FIELD AND THE APPEARANCE OF
DIVERGENT WIND ON RADAR...A DOWNBURST IS CONFIRMED WITH WIND
GUSTS ESTIMATED UP TO 80 MPH. LOCALLY HIGHER WIND MAY HAVE
OCCURRED OWING TO TERRAIN ENHANCEMENT NEAR THE AFOREMENTIONED
RAVINE.

ALTHOUGH UNSURVEYED...DAMAGE WAS REPORTED IN THE AREA OF LEETONIA
OHIO SEVERAL MILES NORTH OF LISBON...WHICH SUGGESTS THE DAMAGING
WIND FROM THIS DOWNBURST ACCOMPANIED THE STORM AS IT MOVED NORTH.

THIS INFORMATION CAN ALSO BE FOUND ON OUR WEBSITE AT
WEATHER.GOV/PITTSBURGH.

AN ADDITIONAL SURVEY IN BUTLER COUNTY PENNSYLVANIA IN THE
VICINITY OF SAXONBURG...LERNERVILLE AND CABOT REVEALED VERY
LITTLE DAMAGE. THE DEBRIS FIELD CONSISTING OF SPOTTY TREE SNAPPAGE
AND THREE UPROOTED TREES PROVED INCONCLUSIVE. NO TORNADO HAS BEEN
CONFIRMED IN BUTLER COUNTY.

FOR REFERENCE...
A DOWNBURST OCCURS WHEN COLD AIR HIGH IN A THUNDERSTORM DESCENDS
AND ACCELERATES. AS THE STREAM OF COLD AIR REACHES THE GROUND...
IT SPREADS OUT AND CAN ACCELERATE FURTHER. WHEN ENVIRONMENTAL
CONDITIONS ARE FAVORABLE...WIND IN A DOWNBURST CAN EXCEED 80 TO
100 MPH. SUCH WIND IS COMPARABLE TO OR STRONGER THAN MANY
TORNADOES AND CAN CAUSE SIMILAR DAMAGE. IN SOME CASES...HAIL AND
VERY HEAVY RAIN ALSO ACCOMPANY THE DOWNBURST...LEADING TO FLOODING
AND SIGNIFICANT DAMAGE FROM WIND-DRIVEN HAIL.

A LOCALIZED DOWNBURST IS CALLED A MICROBURST. THE STRONGEST
MICROBURST RECORDED PRODUCED A WIND GUST TO 158 MPH ON 1 AUGUST
1983 AT ANDREWS AIR FORCE BASE IN MARYLAND. THIS DOWNBURST WAS
ANALYZED IN DETAIL BY DR. TED FUJITA...WHO PIONEERED THE CONCEPT
OF WIND DAMAGE SURVEYS.

$$

KRAMAR






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