Public Information Statement
Issued by NWS Boston, MA

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000 NOUS41 KBOX 071912 PNSBOX CTZ002>004-MAZ002>024-026-NHZ011-012-015-RIZ001>008-072315- PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 312 PM EDT SUN SEP 7 2014 ...MICROBURST /STRAIGHT LINE WIND DAMAGE/ 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. 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. $$ WTB/SR 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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