Public Information Statement
Issued by NWS Boston, MA

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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

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WWW.FACEBOOK.COM/NWSBOSTON

YOU CAN FOLLOW US ON TWITTER AT
@NWSBOSTON



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