Public Information Statement
Issued by NWS Boston, MA

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000 NOUS41 KBOX 072212 PNSBOX CTZ002>004-MAZ002>024-026-NHZ011-012-015-RIZ001>008-082300- PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 612 PM EDT SUN SEP 7 2014 ...THREE MICROBURSTS /STRAIGHT LINE WIND DAMAGE/ CONFIRMED IN SOUTHERN NEW ENGLAND FROM SATURDAY SEPTEMBER 6... ...MICROBURST CONFIRMED IN LEYDEN AND BERNARDSTON IN FRANKLIN COUNTY MA... LOCATION...LEYDEN AND BERNARDSTON IN FRANKLIN COUNTY DATE...SEPTEMBER 6 2014 ESTIMATED TIME...401-410 PM EDT ESTIMATED MAXIMUM WIND SPEED...80 MPH MAXIMUM PATH WIDTH...0.5 MILES PATH LENGTH...5.5 MILES BEGINNING LAT/LON...42.69N / 72.63W ENDING LAT/LON...42.67N / 72.53W * 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 SURVEYED THE REGION FROM LEYDEN TO ORANGE IN FRANKLIN COUNTY TODAY AND HAS DETERMINED THAT A MICROBURST /STRAIGHT-LINE WIND DAMAGE/ OCCURRED IN BOTH LEYDEN AND BERNARDSTON BETWEEN 401 PM AND 410 PM ON SATURDAY SEPTEMBER 6 2014. THE DAMAGE PATH WAS 5.5 MILES LONG BUT DISCONTINUOUS. ESTIMATED WIND SPEEDS WERE 70 TO 80 MPH IN THOSE TWO TOWNS. ONLY ISOLATED MINOR TREE DAMAGE OCCURRED IN ORANGE. IN LEYDEN...SEVERAL LARGE TREES WERE DOWNED ALONG MID COUNTY ROAD...GREENFIELD ROAD...AND EDEN ROAD. IN BERNARDSTON...LARGE TREES WERE DOWNED ON RAILROAD STREET...MERRIFIELD ROAD...AND NORTH MERRIFIELD ROAD. ON NORTH MERRIFIELD ROAD...A FALLEN TREE DESTROYED A SHED AND ALSO DAMAGED A PORTION OF A HOUSE. THERE WAS NO STRUCTURAL DAMAGE FROM THE WIND ITSELF ANYWHERE IN EITHER TOWN. THE DETERMINATION OF MICROBURST WAS ALSO BASED ON SEVERAL EYEWITNESS ACCOUNTS OF THE STRONG WINDS OCCURRING BEFORE THE RAIN ARRIVED AND ALSO BASED ON A RADAR SIGNATURE OF CONVERGENCE ALOFT RATHER THAN ROTATION...WHICH CAN TRANSLATE INTO ENHANCED DOWNDRAFTS AND HENCE A MICROBURST. MOST TREES WERE DOWNED IN A WEST TO EAST DIRECTION. SOMETIMES IT IS VERY DIFFICULT TO DIFFERENTIATE BETWEEN A MICROBURST AND A WEAK EF-0 TORNADO...ESPECIALLY AFTER MUCH OF THE DEBRIS HAS BEEN CLEARED. THE DAMAGE PATH WAS RATHER NARROW...ONLY 0.5 MILES WIDE AT ITS VERY WIDEST...AND THIS WOULD BE SOMETHING ONE WOULD EXPECT WITH A TORNADIC STORM. HOWEVER...THERE WAS NOT ENOUGH OTHER EVIDENCE TO CONCLUSIVELY INDICATE THAT A WEAK TORNADO OCCURRED. SO...THE CONCLUSION IS THAT A MICROBURST OCCURRED WITH PERHAPS A FEW LOCALIZED SPINUPS ON THE LEADING EDGE OF THE GUST FRONT. WE WOULD LIKE TO THANK OUR AMATEUR RADIO SKYWARN PARTNERS FOR PROVIDING DETAILED DAMAGE INFORMATION THAT HELPED US PINPOINT THE LOCATIONS TO INVESTIGATE. WE WOULD ALSO LIKE TO THANK THE CITIZENS OF BERNARDSTON WHO TOOK THE TIME TO SPEAK WITH US AND SHOW US THEIR PROPERTY. && ...MICROBURST CONFIRMED NEAR HOLLIS IN HILLSBOROUGH COUNTY NEW HAMPSHIRE... LOCATION...HOLLIS IN HILLSBOROUGH COUNTY NEW HAMPSHIRE DATE...SEPTEMBER 6 2014 ESTIMATED TIME...0420 PM EDT ESTIMATED MAXIMUM WIND SPEED...110 MPH MAXIMUM PATH WIDTH...200 YARDS PATH LENGTH...1 MILE BEGINNING LAT/LON...42.72N / 71.58W ENDING LAT/LON...42.71N / 71.56W * 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 TAUNTON MA HAS CONFIRMED A MICROBURST /STRAIGHT LINE WIND DAMAGE/ NEAR HOLLIS IN HILLSBOROUGH COUNTY NEW HAMPSHIRE ON SEPTEMBER 6 2014. A NATIONAL WEATHER SERVICE TEAM INVESTIGATED THE DAMAGE WITH THE HELP OF A MEMBER OF HILLSBOROUGH COUNTY AMATEUR RADIO THIS MORNING. REPORTS FROM AMATEUR RADIO OPERATORS AND SKYWARN SPOTTERS HELPED SHAPE THE INITIAL INVESTIGATION AREA. ADDITIONAL INFORMATION FROM RESIDENTS IN THE STORM ZONE HELPED REFINE THE INVESTIGATION AREA. THE MICROBURST TOUCHED DOWN IN THE WOODS NORTHWEST OF EASTMAN LANE. SEVERAL LARGE TREES WERE FELLED IN THE FOREST...INCLUDING ONE THAT PRODUCED A 10-FOOT ROOTBALL AND TWO THAT PRODUCED A 15-FOOT ROOTBALL. THE MAJORITY OF TREES LANDED TOWARD THE EAST OR EAST-SOUTHEAST...COMPASS DIRECTION 100 DEGREES...WHILE A COUPLE LANDED TOWARD THE SOUTH...COMPASS DIRECTION 170 DEGREES. ON EASTMAN LANE AT LEAST TWO MAPLE TREES WERE SNAPPED AT THE BASE. ONE OF THE MAPLE TREES HAD A DIAMETER OF 18 INCHES. THE TREES FELL TOWARD THE EAST-SOUTHEAST...COMPASS DIRECTION 110 DEGREES. THE MICROBURST THEN MOVED ACROSS DOW ROAD...BRINGING DOWN NUMEROUS LARGE BRANCHES ABOUT 18 INCHES IN DIAMETER. TWO LARGE TREES WERE SNAPPED APPROXIMATELY 20 TO 30 FEET ABOVE THE GROUND. TWO LARGE MAPLE TREES...TWO TO THREE FEET WIDE...WERE FELLED AT THE JUNCTION OF DOW ROAD AND JEWETT LANE. ONE PRODUCED A ROOTBALL OF 15 FEET...AND THE OTHER PRODUCED A ROOTBALL OF 20 FEET. THE MAPLES LANDED TOWARD THE EAST AND SOUTHEAST...COMPASS DIRECTIONS 080 DEGREES AND 130 DEGREES. SEVERAL PINE TREES AND MAPLE TREES ALONG JEWETT LANE WERE SNAPPED AND FELL TOWARD THE EAST...COMPASS DIRECTION 080 DEGREES. THERE WAS ONE DAMAGED HOUSE OBSERVED...BUT THIS APPEARED TO BE DUE TO A FALLING TREE RATHER THAN DIRECTLY DUE TO WIND. THERE WERE ADDITIONAL BRIEF MICROBURSTS NEAR SILVER LAKE IN HOLLIS AND IN SOUTHWEST NASHUA. THESE PRODUCED SIMILAR DAMAGE TO THE LONGER MICROBURST. ALL OF THE DAMAGE WAS ASSOCIATED WITH SOFTWOOD AND HARDWOOD TREES. ACCORDING TO THE DEGREES OF DAMAGE PORTION OF THE ENHANCED FUJITA SCALE...THE MOST SIGNIFICANT DAMAGE WOULD BE EXPECTED FROM WINDS OF 104 TO 110 MPH. THE REMAINDER OF THE DAMAGE WOULD BE ASSOCIATED WITH SPEEDS OF 75 TO 85 MPH. ACCORDINGLY...WE HAVE ESTIMATED THE MAXIMUM WIND SPEED AT 110 MPH. THE NATIONAL WEATHER SERVICE WOULD LIKE TO THANK HILLSBOROUGH COUNTY AMATEUR RADIO AND THE RESIDENTS OF THIS DAMAGE ZONE FOR THEIR ASSISTANCE IN INVESTIGATING THE DAMAGE FROM THIS STORM. && ...MICROBURST CONFIRMED IN IPSWICH IN ESSEX COUNTY MA... LOCATION...IPSWICH IN ESSEX COUNTY MA DATE...SEPTEMBER 6 2014 ESTIMATED TIME...530 PM EDT ESTIMATED MAXIMUM WIND SPEED...80 TO 90 MPH MAXIMUM PATH WIDTH...1 MILE PATH LENGTH...2 MILES BEGINNING LAT/LON...42.69N / 70.89W ENDING LAT/LON...42.67N / 70.82W * 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 TAUNTON MA HAS CONFIRMED A MICROBURST /STRAIGHT LINE WIND DAMAGE/ NEAR IPSWICH IN ESSEX COUNTY MA ON SEPTEMBER 6 2014. OVER ONE HUNDRED TREES WERE DOWNED...SNAPPED OR LOST LARGE BRANCHES IN IPSWICH. THIS INCLUDED HARDWOOD AND SOFTWOOD TREES SUCH AS OAKS AND PINES. POWER WAS OUT FOR A VAST MAJORITY OF THE TOWN SINCE MANY UTILITY LINES WERE BROUGHT DOWN. DAMAGE FROM THE MICROBURST BEGAN AT MILE LANE AND LINEBROOK ROAD WHERE TOPS OF A LARGE PINE TREE AND OAK TREE WERE SNAPPED OFF...AND ENDED ON ARGILLA ROAD WHERE LARGE TREE LIMBS AND POWER LINES WERE DOWNED. THE MOST SIGNIFICANT DAMAGE WAS ON TOPSFIELD ROAD WHERE A LARGE PINE TREE WAS DOWNED AND MULTIPLE UTILITY LINES WERE DOWNED INCLUDING A TRANSFORMER. DAMAGE WAS ALSO SIGNIFICANT ON SOUTH MAIN STREET AT COUNTY ROAD WHERE LARGE OAK TREES HAD LIMBS SNAPPED OFF AND NUMEROUS POWER AND UTILITY LINES WERE DOWNED. ON WALDINGFIELD ROAD...A LARGE TREE AND LIMBS WERE DOWNED ONTO THE COMMUTER RAIL TRACKS WHICH CAUSED DELAYS UNTIL THE DEBRIS COULD BE CLEARED. BASED UPON THE OBSERVED DAMAGE...MAXIMUM WIND SPEEDS WERE ESTIMATED TO BE AS HIGH AS 80 TO 90 MPH. THE DAMAGE PATH WAS DISCONTINUOUS AND WAS ABOUT TWO MILES LONG AND ONE MILE WIDE. A WIND GUST TO 63 MPH WAS MEASURED AT THE IPSWICH FIRE DEPARTMENT AT 530 PM. THE FIRE STATION IS ON CENTRAL STREET WHICH IS ABOUT ONE MILE NORTH OF THE AREA THAT SUSTAINED THE MOST DAMAGE. THE NATIONAL WEATHER SERVICE WOULD LIKE TO THANK JIM PALMER WHO IS THE NORTH SHORE AMATEUR RADIO SKYWARN COORDINATOR...AND JON HUBBARD WHO IS THE EMA DIRECTOR FOR IPSWICH...FOR THEIR ASSISTANCE WITH THIS STORM SURVEY. THIS INFORMATION CAN ALSO BE FOUND ON OUR WEBSITE AT WEATHER.GOV/BOX. 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. $$ GAF - LEYDEN/BERNARDSTON WTB/SR - HOLLIS JWD - IPSWICH FOR THE LATEST UPDATES...PLEASE VISIT OUR WEBPAGE AT WWW.WEATHER.GOV/BOSTON YOU CAN FOLLOW US ON FACEBOOK AT WWW.FACEBOOK.COM/NWSBOSTON YOU CAN FOLLOW US ON TWITTER AT @NWSBOSTON

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