Public Information Statement
Issued by NWS Portland, ME

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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
700 AM EDT THU APRIL 28 2016

THE NATIONAL WEATHER SERVICE HAS DECLARED THE WEEK OF APRIL
25TH THROUGH 29TH, SEVERE WEATHER AWARENESS WEEK IN NEW
ENGLAND. THIS IS THE FOURTH IN A SERIES OF FIVE PUBLIC
INFORMATION STATEMENTS ON VARIOUS TOPICS RELATED TO SEVERE
WEATHER AWARENESS.


...SEVERE WEATHER AWARENESS - TORNADOES...

TORNADOES ARE NATURE`S MOST VIOLENT STORM.  BY DEFINITION, A
TORNADO IS A VIOLENTLY ROTATING COLUMN OF AIR THAT EXTENDS
FROM THE BASE OF THE THUNDERSTORM CLOUD TO THE GROUND.

IN ADDITION TO THE THREE BASIC INGREDIENTS NEEDED FOR THE
FORMATION OF THUNDERSTORMS AND SEVERE THUNDERSTORMS (LOW-
LEVEL MOISTURE, AN UNSTABLE ATMOSPHERE, AND A SOURCE OF
LIFT), WINDS AT VARIOUS LEVELS IN THE ATMOSPHERE FACTOR INTO
THE DEVELOPMENT OF TORNADOES.

USUALLY, PRIOR TO THE DEVELOPMENT OF A TORNADO, A PRE-
TORNADIC THUNDERSTORM DEVELOPS A CIRCULATION, THAT IS, IT
STARTS ROTATING (A MESO-CYCLONE).  AS THIS ROTATION BECOMES
STRONGER, THE CHANCE THAT A TORNADO MAY DEVELOP ALSO
INCREASES.  ALTHOUGH THE NATIONAL WEATHER SERVICE`S DOPPLER
RADAR GENERALLY CAN NOT SEE THE ACTUAL TORNADO, THE RADAR
DOES DETECT ROTATION OF THE THUNDERSTORM CLOUD, AND THEREBY
GIVES SOME INDICATION OF THE POSSIBILITY THAT A TORNADO MAY
BE FORMING OR HAS FORMED.

THE SCALE USED TO MEASURE TORNADO DAMAGE IS THE ENHANCED
FUJITA SCALE (NAMED AFTER THEODORE FUJITA, A FAMOUS TORNADO
DAMAGE EXPERT).  THIS SCALE IS COMMONLY REFERRED TO AS THE E-
F SCALE.  BASED ON SCIENTIFIC STUDIES OF TORNADO DAMAGE, THE
ORIGINAL FUJITA SCALE WAS MODIFIED AND THE NEW "ENHANCED
FUJITA SCALE" WAS OFFICIALLY IMPLEMENTED IN 2007.

  EF-0 - LIGHT DAMAGE (WINDS 65 TO 85 MPH)
  EF-1 - MODERATE DAMAGE (WINDS 86 TO 110 MPH)
  EF-2 - CONSIDERABLE DAMAGE (WINDS 111 TO 135 MPH)
  EF-3 - SEVERE DAMAGE (WINDS 136 TO 165 MPH)
  EF-4 - DEVASTATING DAMAGE (WINDS 166 TO 200 MPH)
  EF-5 - INCREDIBLE DAMAGE (WINDS OVER 200 MPH)

PEAK TORNADO ACTIVITY IN NORTHERN NEW ENGLAND OCCURS BETWEEN
JUNE AND AUGUST, BUT TORNADOES HAVE OCCURRED AS EARLY AS MAY
AND AS LATE AS NOVEMBER.  MOST TORNADOES OCCUR BETWEEN 3 AND
9 PM AND HAVE AN AVERAGE FORWARD SPEED OF ABOUT 30 MPH.  FOR
THE 40 YEAR PERIOD BETWEEN 1950 AND 1990, 74 TORNADOES
OCCURRED IN MAINE WHILE 68 TORNADOES OCCURRED IN NEW
HAMPSHIRE.  BASED ON THESE DATA, EACH STATE HAD AVERAGED
ABOUT TWO TORNADOES PER YEAR.  DURING THIS PERIOD, THE
AVERAGE PATH LENGTH OF THE TORNADOES WAS 1.08 MILES FOR MAINE
AND 1.64 MILES FOR NEW HAMPSHIRE.  THE STRONGEST TORNADO
OBSERVED IN MAINE WAS AN F2, WHILE THE STRONGEST TORNADO
OBSERVED IN NEW HAMPSHIRE WAS AN F3.

DURING 2015, THERE WAS ONE TORNADO RECORDED IN NEW HAMPSHIRE
AND NONE IN MAINE.

HERE IS A LIST OF THE 64 DOCUMENTED TORNADOES IN MAINE AND
NEW HAMPSHIRE SINCE 1995.

EF2/F2

     JUL 08 1996  COBBOSSEECONTEE LAKE, MAINE
     JUL 03 1997  GREENFIELD, NEW HAMPSHIRE
     MAY 31 1998  ANTRIM, NEW HAMPSHIRE
     JUL 06 1999  PITTSFIELD/BARNSTEAD/STRAFFORD,
                  NEW HAMPSHIRE
AUG 09 2000  CORNVILLE, MAINE
MAY 21 2006  HAMPTON FALLS, NEW HAMPSHIRE
     JUL 24 2008  DEERFIELD TO FREEDOM, NEW HAMPSHIRE
                  (50 MILE PATH LENGTH)

EF1/F1
     JUL 23 1995  NEW HAMPTON, NEW HAMPSHIRE
     JUN 21 1997  ROME, MAINE
     JUL 03 1997  SWANZEY, NEW HAMPSHIRE
     OCT 01 1998  SOUTH PARIS, MAINE
     AUG 13 1999  SWEDEN, MAINE
     AUG 13 1999  PLAINFIELD/ENFIELD, NEW HAMPSHIRE
JUL 18 2000  NEWRY/HANOVER, MAINE
     JUN 17 2001  NEWRY/HANOVER, MAINE
     JUL 24 2001  PENOBSCOT COUNTY (16 MILES NORTHWEST OF
                  PATTEN)
     JUL 24 2001  OAKFIELD, MAINE
MAY 31 2002  WEST PARIS, MAINE
     JUL 04 2002  AROOSTOOK COUNTY (8 MILES WEST OF
                  LITTLETON)
     NOV 24 2005  PHIPPSBURG, MAINE
SEP 29 2006  NORTH BERWICK, MAINE
MAY 24 2009  EAGLE LAKE, MAINE
     MAY 31 2009  WESTFIELD, MAINE
     MAY 31 2009  EASTON, MAINE
     AUG 21 2009  NORWAY TO HARTFORD, MAINE
                 (UP TO 700 YARDS WIDE)
     JUN  5 2010  SOUTH PARIS, OXFORD, HEBRON, MAINE
     JUL 21 2010  NEWFIELD TO LIMERICK, MAINE
     JUL 21 2010  BUXTON TO GORHAM, MAINE
     JUL 21 2010  SHAPLEIGH TO ALFRED, MAINE
     JUN  1 2011  BRYANT POND, MAINE
     JUN  1 2011  NEW PORTLAND TO EMBDEN, MAINE
     AUG 21 2011  CANAAN, NEW HAMPSHIRE
     JUL 15 2014  SAINT ALBANS, MAINE
     JUL 28 2014  LIMINGTON, MAINE

EF0/F0
     JUL 28 1997  FT. KENT, MAINE
     AUG 27 1997  CHARLESTON, MAINE
     JUL 23 2002  AROOSTOOK COUNTY (7 MILES NORTHWEST OF
                  KNOWLES CORNER)
     AUG 08 2004  SEBAGO LAKE, MAINE
     AUG 13 2004  SANBORNTON/MEREDITH, NEW HAMPSHIRE
     AUG 01 2005  NORTH TWIN LAKE, MAINE
     NOV 24 2005  BRUNSWICK, MAINE
SEP 29 2006  EFFINGHAM, NEW HAMPSHIRE
     JUL 15 2007  LONG LAKE IN AROOSTOOK COUNTY, MAINE
     MAY 31 2009  OXBOW, MAINE
     JUN 26 2009  STOCKHOLM, MAINE
     JUL 18 2009  EAST BETHEL, MAINE
     JUN  2 2010  SHIN POND, MAINE
     JUN  5 2010  GORHAM, NEW HAMPSHIRE
     JUN  8 2011  LITTLE MADAWASKA LAKE, MAINE
     JUN  8 2011  AROOSTOOK COUNTY, MAINE
     JUN  9 2011  AROOSTOOK COUNTY, MAINE
     JUL 26 2011  COLEBROOK, NEW HAMPSHIRE
     JUN 25 2012  WEST ALTON, NEW HAMPSHIRE
     JUL 17 2012  BRIDGEWATER, NEW HAMPSHIRE
     JUL 24 2012  WOOLWICH, MAINE
     JUN  2 2013  PLEASANT RIDGE PLANTATION, MAINE
     JUL 17 2013  DANFORTH, MAINE
     JUL 19 2013  14 MILES NORTH OF CHAMBERLAIN LAKE, MAINE
     SEP 11 2013  15 MILES EAST OF CHURCHILL DAM, MAINE
     MAY 26 2014  LUDLOW, MAINE
     JUL  4 2014  LAKE WINNIPESAUKEE, NH (WATERSPOUT)
     JUL 24 2014  LAKE WINNIPESAUKEE, NH (WATERSPOUT)
     JUL 27 2014  SEBAGO LAKE, ME (WATERSPOUT)
     JUL 30 2015  WARNER, NEW HAMPSHIRE


TO ALERT THE PUBLIC TO THE THREAT OF TORNADOES, THE NATIONAL
WEATHER SERVICE ISSUES TORNADO WATCHES AND WARNINGS.  A
TORNADO WATCH INDICATES THAT ATMOSPHERIC CONDITIONS ARE
FAVORABLE FOR THE DEVELOPMENT OF TORNADOES.  A TORNADO
WARNING INDICATES THAT A TORNADO IS IMMINENT OR IS ALREADY
OCCURRING.  IF YOU HEAR THAT A TORNADO WARNING HAS BEEN
ISSUED FOR YOUR AREA, SEEK SAFE SHELTER IMMEDIATELY IF YOU
ARE IN THE PATH OF THE STORM.

DUE TO THE USUAL SHORT LIFE-SPAN OF TORNADOES IN NORTHERN NEW
ENGLAND, THERE IS OFTEN LITTLE, IF ANY, ADVANCE WARNING.
TORNADOES IN NEW ENGLAND GENERALLY TOUCH DOWN AND THEN LIFT
OFF THE GROUND VERY QUICKLY.  MANY OF THE TORNADOES THAT HAVE
OCCURRED IN THE PAST, HAVE OCCURRED WHILE SEVERE THUNDERSTORM
WARNINGS HAVE BEEN IN EFFECT.  IF YOU HEAR THAT A SEVERE
THUNDERSTORM WARNING IS IN EFFECT FOR YOUR AREA, BE ALERT FOR
THE POSSIBILITY OF A TORNADO.  A LOW ROTATING CLOUD, LARGE
HAIL, AND/OR A LOAD ROAR ARE ALL SIGNS THAT MAY PRECEDE THE
TOUCHDOWN OF A TORNADO.

HERE ARE SOME TORNADO FACTS AND SAFETY TIPS.

   *  FLYING DEBRIS CAUSES MOST DEATHS AND INJURIES IN
      TORNADOES

   *  THE SAFEST PLACE IN YOUR HOME DURING A TORNADO IS YOUR
      BASEMENT.

   *  STAY AWAY FROM WINDOWS.

   *  GET OUT OF VEHICLES OR MOBILE HOMES, THEY OFFER LITTLE
      PROTECTION.  SEEK SHELTER IN A SUBSTANTIAL BUILDING.

   *  DO NOT SEEK SHELTER UNDER A BRIDGE OVERPASS.  BRIDGE
      OVERPASSES OFFER LITTLE, IF ANY, PROTECTION FROM WIND-
      DRIVEN DEBRIS.


HERE IS A LIST OF THE REMAINING TOPICS THAT WILL BE COVERED
IN PUBLIC INFORMATION STATEMENTS ISSUED BY THE NATIONAL
WEATHER SERVICE THIS WEEK.

FRIDAY......FLASH FLOODS
$$

JENSENIUS
NATIONAL WEATHER SERVICE
GRAY, MAINE

NNNN



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