Public Information Statement
Issued by NWS Boston, MA

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
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



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.