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Upton, NY
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July 7th Overnight Supercell
***This data is un-official and for informational purposes only.***

The Meteorology behind the storm

Storm Survey


...DAMAGE FROM OVERNIGHT STORMS IN SOUTHERN WESTCHESTER COUNTY
CLASSIFIED AS STRAIGHT LINE WINDS...

LOCATION...YONKERS TO EASTCHESTER, WESTCHESTER, NY
DATE...JULY 7, 2009
ESTIMATED TIME...1125 PM TO 1140 PM
ESTIMATED MAXIMUM WIND SPEED...100 MPH (REVISED)
PATH WIDTH...UP TO 1 MILE (VARIED)
PATH LENGTH...AT LEAST 5 MILES (IN WESTCHESTER)
FATALITIES...NONE
INJURIES...1

METEOROLOGISTS FROM THE NATIONAL WEATHER SERVICE (NWS) NEW YORK, NY
FORECAST OFFICE CONDUCTED A SURVEY OF THE DAMAGE IN SOUTHERN
WESTCHESTER COUNTY THIS AFTERNOON. THE METEOROLOGISTS CONCLUDED THAT
THE DAMAGE WAS THE RESULT OF STRAIGHT LINE WINDS.

THE SAME STORM THAT PRODUCED STORM DAMAGE IN BERGEN COUNTY IN
NORTHEASTERN NEW JERSEY MOVED INTO YONKERS AROUND 1125 PM AS THE
STORM INTENSIFIED.  DOPPLER WEATHER RADAR ANALYSIS WOULD CLASSIFY
THE STORM AS A SUPERCELL WITH A STRONG MESOCYCLONE AT THIS TIME. A
LARGE AREA OF VERY STRONG DOWNBURST WINDS DOWNED NUMEROUS LARGE
TREES THAT FELL ON STRUCTURES, POWERLINES AND CARS. THE WORST DAMAGE
OBSERVED IN THE AREA WAS IN TREVOR PARK AROUND THE HUDSON RIVER
MUSEUM WHERE WINDS WERE ESTIMATED TO HAVE GUSTED UP TO AN ESTIMATED
100 MPH. SOME MINOR DAMAGE APPEARED TO OCCUR TO THE ROOF OF THE
MUSEUM WITH A FEW SHINGLES BLOWN OFF. NEARLY ALL TREES APPEARED TO
HAVE FALLEN TO THE EAST OR SOUTHEAST. THE DAMAGE AREA EXTENDED EAST
TO NORTH BROADWAY AND INTO GRANT PARK ON PARK AVE WHERE NUMEROUS
LARGE TREES WERE ALSO KNOCKED OVER FALLING TO THE EAST OR SOUTHEAST.
DOWNED LARGE TREES WERE ALSO OBSERVED IN OAKLAND CEMETERY.

DOWNED TREES WERE ALSO OBSERVED IN MOUNT VERNON ALONG WEST STREET
AND MACQUESTEN PARKWAY NORTH WHERE WINDS OF 70 MPH WERE ESTIMATED TO
HAVE OCCURRED. AGAIN, ALL TREES APPEARED TO FALL TO THE SOUTHEAST.
THERE WAS ADDITIONAL TREE DAMAGE TO A LESSER DEGREE TO THE NORTH
OBSERVED ALONG AND NEAR THE CROSS COUNTY PARKWAY.

IN BRONXVILLE, SEVERAL TREES WERE SEEN DOWNED ALONG THE BRONX RIVER
PARKWAY FROM EXITS 1 TO 3. IN EASTCHESTER/TUCKAHOE, SEVERAL LARGE
TREES WERE DOWNED IN THE VICINITY OF RIDGE AND GOVERNORS ROADS. A
LARGE TREE HERE FELL ON POWERLINES SNAPPING A TELEPHONE POLE IN
HALF. WINDS IN THIS AREA WERE ESTIMATED AT 80 MPH.

IN ADDITION TO THE WIND DAMAGE, THERE WAS EXTENSIVE HAIL FROM THE
STORM ALONG WITH TORRENTIAL RAIN. THE HAIL ACCUMULATED TO SEVERAL
INCHES IN YONKERS AND WAS STILL VISIBLE THIS MORNING. RAIN SWEPT THE
HAIL INTO SOME LOCATIONS TO DEPTH OVER A FOOT. IN ONE LOCATION ON
HOOVER ROAD IN NORTHERN YONKERS...UP TO 4 FEET OF HAIL ACCUMULATED
INSIDE A HOME AFTER THE DRAINAGE BECAME CLOGGED.

LASTLY, IN NORTHERN NASSAU COUNTY ON LONG ISLAND...A LIMITED SURVEY
OF JERICHO AND SEA CLIFF DID NOT REVEAL ANY SIGNIFICANT DAMAGE.

THE NWS EXTENDS ITS SINCERE APPRECIATION TO THE WESTCHESTER COUNTY
EXECUTIVE AND OFFICE OF EMERGENCY MANAGEMENT FOR THEIR CONTINUED
SUPPORT AND COLLABORATION WITH THIS AND PAST STORM EVENTS. WE ALSO
EXTEND OUR APPRECIATION TO THE RESIDENTS AND EMERGENCY RESPONDERS OF
SOUTHERN WESTCHESTER COUNTY THAT GRACIOUSLY TOOK THE TIME TO
DESCRIBE THE STORM TO US AND ASSIST WITH THE SURVEY.

$$

TONGUE/LEPTICH
		  

Damage Pictures

(click to enlarge)
storm damage storm damage storm damage
storm damage storm damage storm damage
storm damage storm damage storm damage
storm damage storm damage storm damage
Pictures taken by Adrienne Leptich, Meteorologist WFO NY, New York

Storm Reports



PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE NEW YORK NY
504 PM EDT WED JUL 08 2009


1105 PM     TSTM WND DMG     RAMSEY                  41.06N 74.15W
07/07/2009                   BERGEN             NJ   TRAINED SPOTTER

            SEVERAL TREES DOWN ON PLAZA LANE AND NORTH STREET NEAR
            TRAIN STATION

1106 PM     TSTM WND DMG     RAMSEY                  41.06N 74.15W
07/07/2009                   BERGEN             NJ   PUBLIC

            MULTIPLE TREES DOWN CLOSING DARLINGTON AVENUE AT NORTH
            STREET, TIME ESTIMATED FROM RADAR

1110 PM     TSTM WND DMG     WNW ALLENDALE           41.03N 74.13W
07/07/2009                   BERGEN             NJ   TRAINED SPOTTER

            TREES DOWN BLOCKING FORREST ROAD AND HILLSIDE AVENUE

1114 PM     TSTM WND GST     HILLSDALE               41.01N 74.04W
07/07/2009  M58.00 MPH       BERGEN             NJ   PUBLIC

            POWER LINES DOWN, LARGE TREE LIMBS DOWN, TRANSFORMER
            BLOWN, TIME ADJUSTED FROM RADAR

1114 PM     HAIL             HILLSDALE               41.01N 74.04W
07/07/2009  E0.75 INCH       BERGEN             NJ   PUBLIC

            PENNY SIZE HAIL, TIME ADJUSTED FROM RADAR

1117 PM     TSTM WND DMG     WOODCLIFF LAKE          41.03N 74.06W
07/07/2009                   BERGEN             NJ   TRAINED SPOTTER

            TREES DOWN BLOCKING PASCACK ROAD AND WOODCLIFF AVENUE

1125 PM     HAIL             YONKERS                 40.95N 73.87W
07/07/2009  E1.75 INCH       WESTCHESTER        NY   TRAINED SPOTTER

            GOLF BALL SIZE HAIL

1131 PM     TSTM WND DMG     YONKERS                 40.95N 73.87W
07/07/2009                   WESTCHESTER        NY   BROADCAST MEDIA

            LARGE TREE ON BRENTTON AND DOVER ROAD SNAPPED IN HALF.
            UPPER PART FELL ON HOUSE.

1131 PM     TSTM WND DMG     YONKERS                 40.95N 73.87W
07/07/2009                   WESTCHESTER        NY   PUBLIC

            LARGE TREES AND BRANCHES DOWN, TIME ADJUSTED FROM RADAR

1131 PM     HAIL             YONKERS                 40.95N 73.87W
07/07/2009  E0.75 INCH       WESTCHESTER        NY   PUBLIC

            PENNY SIZE HAIL, TIME ADJUSTED FROM RADAR

1131 PM     TSTM WND DMG     1 NNE YONKERS           40.96N 73.86W
07/07/2009                   WESTCHESTER        NY   FIRE DEPT/RESCUE

            *** 1 INJ *** TREE FELL INTO THE BEDROOM OF A HOME AND
            INJURED A WOMAN, TIME ESTIMATED FROM RADAR.

1140 PM     HAIL             MOUNT VERNON            40.91N 73.83W
07/07/2009  E1.00 INCH       WESTCHESTER        NY   PUBLIC

            QUARTER SIZE HAIL WAS REPORTED NEAR STUYVESANT PLAZA AND
            DEVONIA AVE, TIME ADJUSTED FROM RADAR.

1140 PM     TSTM WND GST     MOUNT VERNON            40.91N 73.83W
07/07/2009  E65.00 MPH       WESTCHESTER        NY   PUBLIC

            MULTIPLE TREES AND WIRES DOWN NEAR STUYVESANT PLAZA AND
            DEVONIA AVE, TIME ADJUSTED FROM RADAR.

1144 PM     TSTM WND DMG     LARCHMONT               40.93N 73.75W
07/07/2009                   WESTCHESTER        NY   PUBLIC

            LARGE TREE DOWN ON STRETCH OF LARCHMONT AVE BETWEEN OAK
            AND WOODBINE AVE, TIME ADJUSTED FROM RADAR.

1145 PM     HAIL             NEW ROCHELLE            40.92N 73.78W
07/07/2009  E1.00 INCH       WESTCHESTER        NY   TRAINED SPOTTER

            QUARTER SIZE HAIL

1145 PM     TSTM WND GST     NEW ROCHELLE            40.92N 73.78W
07/07/2009  M65.00 MPH       WESTCHESTER        NY   TRAINED SPOTTER

1153 PM     TSTM WND DMG     SEA CLIFF               40.85N 73.64W
07/07/2009                   NASSAU             NY   EMERGENCY MNGR

            TREES DOWN THROUGHOUT TOWN, TIME ESTIMATED FROM RADAR

1159 PM     HAIL             GLEN COVE               40.87N 73.64W
07/07/2009  E0.88 INCH       NASSAU             NY   EMERGENCY MNGR

            NICKEL SIZE HAIL

1159 PM     MARINE TSTM WIND 1 N BAYVILLE            40.92N 73.56W
07/07/2009  M55.00 MPH       ANZ335             NY   MESONET

            WIND GUST OF 48 KT MEASURED

1201 AM     TSTM WND DMG     BROOKVILLE              40.81N 73.57W
07/08/2009                   NASSAU             NY   EMERGENCY MNGR

            TREES DOWN THROUGHOUT TOWN, TIME ESTIMATED FROM RADAR

1201 AM     HAIL             1 NE LOCUST VALLEY      40.89N 73.57W
07/08/2009  E0.88 INCH       NASSAU             NY   EMERGENCY MNGR

            NICKEL SIZE HAIL REPORTED IN LATTINGTOWN

1201 AM     HAIL             LOCUST VALLEY           40.88N 73.59W
07/08/2009  E0.88 INCH       NASSAU             NY   EMERGENCY MNGR

            NICKEL SIZE HAIL

1206 AM     HAIL             MILL NECK               40.88N 73.56W
07/08/2009  E0.75 INCH       NASSAU             NY   TRAINED SPOTTER

            PENNY SIZE HAIL

1213 AM     TSTM WND DMG     YONKERS                 40.95N 73.87W
07/08/2009                   WESTCHESTER        NY   DEPT OF HIGHWAYS

            SAW MILL RIVER PKWY CLOSED NORTHBOUND BETWEEN TUCKAHOE RD
            AND EXECUTIVE BLVD AND SOUTHBOUND BETWEEN EXECUTIVE BLVD
            AND LOCKWOOD AVE DUE TO DOWNED TREES.

1215 AM     TSTM WND DMG     JERICHO                 40.79N 73.54W
07/08/2009                   NASSAU             NY   EMERGENCY MNGR

            TREES DOWN THROUGHOUT TOWN, TIME ESTIMATED FROM RADAR

1215 AM     TSTM WND DMG     SYOSSET                 40.82N 73.50W
07/08/2009                   NASSAU             NY   EMERGENCY MNGR

            TREES DOWN THROUGHOUT TOWN, TIME ESTIMATED FROM RADAR

0115 AM     MARINE TSTM WIND 1 S GILGO STATE PARK    40.62N 73.37W
07/08/2009  M45.00 MPH       ANZ355             NY   MESONET

            WIND GUST OF 39 KT MEASURED

		  



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Upton, NY 11973

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Page last modified: July 07, 2009
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