Severe Thunderstorm Warning 106, NWS Boston/Norton, MA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAUNTON MA
735 PM EDT MON JUL 19 2010

.SYNOPSIS...
A WEAK COLD FRONT WILL LIKELY BRING A ROUND OF SCATTERED SHOWERS AND
THUNDERSTORMS TO THE REGION THIS EVENING. OVERALL...MUCH OF THE
FORECAST PERIOD WILL FEATURE MORE OF THE SAME WEATHER WE HAVE BEEN
HAVING DURING JULY...VERY WARM AND HUMID WITH A BOUT OR TWO OF
SCATTERED SHOWERS/THUNDERSTORMS. THE BEST CHANCE FOR MEASURABLE
RAIN LOOKS TO OCCUR LATER TUESDAY NIGHT INTO WEDNESDAY AND THEN
AGAIN LATE FRIDAY INTO EARLY SATURDAY.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
CONVECTION HAS FINALLY MATERIALIZED IN SOUTHERN NEW ENGLAND THIS
EVENING. MAIN STORM IS SUPERCELL WITH A RADAR INDICATED TORNADO IN
NORTHERN WORCESTER COUNTY WHICH IS A RIGHT MOVER NEAR WARM FRONTAL
BOUNDARY. VERY IMPRESSIVE VELOCITY/REFLECTIVITY SIGNTAURES BUT NO
CONFIRMATION OF A TORNADO AS OF 730 PM.

OTHER STORMS ARE FILLING IN FROM BERKSHIRES INTO CT VALLEY AND ARE
FEEDING ON INSTABILITY MAX IN THAT AREA. ISOLATED SEVERE STORMS
POSSIBLE IN THESE AREAS OVER NEXT COUPLE OF HOURS BEFORE THEY
DISSIPATE BETWEEN 10 PM AND MIDNIGHT.

FARTHER E...STORMS SHOULD WEAKEN AS THEY ENCOUNTER MORE STABLE
AIRMASS EARLY TONIGHT.

WEAK COOL FRONT WILL CROSS REGION AFTER MIDNIGHT AND BRING AN END
TO ANY ACTIVITY.

&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/...
FOR TUESDAY...PARTLY CLOUDY SKIES ARE EXPECTED BEHIND THE COLD
FRONT...WITH HIGHS IN THE MID TO UPPER 80S. TEMPERATURES WILL BE SOMEWHAT
COOLER ALONG THE COASTLINE WHERE A SEA BREEZE IS ANTICIPATED.

MODEL SOUNDINGS INDICATE A FAIRLY STABLE AIRMASS FOR MUCH OF THE DAY
WITH MID LEVEL DRY AIR AND A CAP. GFS INDICATES INCREASING MOISTURE
LATER IN THE DAY AND EVENING WITH A CHANCE OF SHOWERS AND
THUNDERSTORMS...BUT NAM AND ECMWF SHOW A DRIER SOLUTION.  AT THIS
TIME BELIEVE THAT THE GFS MODEL MAY CONTINUE TO BE TOO FAST SO WILL
CONTINUE DRY FORECAST TUESDAY. HOWEVER SCATTERED CONVECTION IS POSSIBLE
LATER TUESDAY NIGHT WITH A SHORT WAVE AFFECTING THE AREA...
ACCOMPANIED BY INCREASING MOISTURE. THERE IS A LOW PROBABILITY OF
AN MCS AFFECTING THE AREA LATER TUESDAY NIGHT.

A MODERATE RISK OF RIP CURRENTS EXISTS FOR TUESDAY DUE TO
INCREASED SOUTHERLY SWELL.

&&

.LONG TERM /WEDNESDAY THROUGH MONDAY/...
RELATIVELY WEAK SHORT WAVE TROUGH WILL APPROACH THE REGION
WEDNESDAY MORNING. A FEW OF THE GUIDANCE SUITE MEMBERS ARE STILL
ADVERTISING AN MCS-LIKE FEATURE MOVING ACROSS OR JUST SOUTH OF
SOUTHERN NEW ENGLAND DURING THIS TIME. WE THINK THAT/S A LOW
PROB...AND WILL CONTINUE TO STICK WITH THE ECMWF SOLUTION OF MORE
SCT CONVECTION LATE TUE NIGHT THROUGH WEDNESDAY. WILL CONTINUE TO
KEEP AN EYE OUT FOR SOMETHING MORE ORGANIZED AND WIDESPREAD...BUT
WE THINK SCT ACTIVITY IS THE WAY TO GO RIGHT NOW.

THEREAFTER...WED NIGHT THROUGH MUCH OF FRIDAY...MOSTLY DRY WEATHER
LOOKS LIKE THE WAY TO GO...WITH PERHAPS DRIER DEWPOINT VALUES
WORKING IN FROM THE NORTH DESPITE TEMPS REMAINING WARM.

MODELS ARE IN DECENT AGREEMENT FOR LATE FRIDAY INTO THE WEEKEND AS
LOW PRESSURE MOVES EASTWARD FROM THE NORTHERN GREAT LAKES...WITH A
WARM FRONTAL BOUNDARY EXTENDING SOUTHEASTWARD TOWARD SOUTHERN NEW
ENGLAND. THIS SETUP MAY ALLOW FOR AN MCS TO FORM NEAR THE GREAT
LAKES AND MOVE TOWARD SOUTHERN NEW ENGLAND LATER FRIDAY AND FRIDAY
NIGHT. HOWEVER...BEING THAT FAR OUT IN TIME...CONFIDENCE IS VERY
LOW. HOWEVER WE DID GO WITH CHANCE POPS. POTENTIAL FOR WARM SECTOR
SATURDAY WITH COLD FRONT APPROACHING MAY ALLOW FOR HOT TEMPS AND A
CHANCE FOR SEVERE WEATHER. COULD SEE THE HOTTEST SFC AIR REMAINING
TO OUR WEST/SOUTHWEST THOUGH.

COOLER AND DRIER WEATHER FOR SUNDAY AND MONDAY IN THE WAKE OF COLD
FRONT.

&&

.AVIATION /23Z MONDAY THROUGH SATURDAY/...
00Z TAFS ARE MEDIUM CONFIDENCE PVD/FMH/HYA/ACK DUE TO POTENTIAL
FOR LOW CLOUDS/FOG TONIGHT.

TSTMS EXPECTED TO IMPACT BAF/BDL/MHT AND POSSIBLY ORH PRIOR TO
04Z. STORMS SHOULD WEAKEN BEFORE REACHING PVD/BOS. LOW CLOUDS/FOG
AROUND CAPE COD AND ISLANDS WILL TRY TO SPREAD INTO RI AND EASTERN
MA BEFORE MIDNIGHT BUT WE ARE NOT CONFIDENT MVFR/IFR CIGS WILL
MAKE IT THAT FAR N. COOL FRONT WILL CROSS AREA 04Z-06Z WHICH
SHOULD LEAD TO IMPROVING CIGS/VSBYS AFTER WIND SHIFT.

KBOS...HIGH CONFIDENCE. TS EXPECTED TO REMAIN OUTSIDE TERMINAL
AREA THROUGH 04Z.

OUTLOOK...WEDNESDAY THROUGH SATURDAY...

TYPICAL MIDSUMMER PATTERN FOR AVIATION WEATHER. EXCEPT AS NOTED
BELOW...EXPECT AREAS OF IFR/LIFR IN FOG AND LOW CLOUDS EACH LATE
NIGHT AND EARLY MORNING GIVING WAY TO VFR DURING THE DAY. THE
HIGHEST CHANCE AND MOST PERSISTENT LOW CONDITIONS WOULD BE ALONG
THE SOUTH COAST AND ISLANDS. SCATTERED MVFR IN SHOWERS/TSTMS
TUESDAY NIGHT AND WEDNESDAY...AND PERHAPS AGAIN FRIDAY NIGHT.

&&

.MARINE...
SHOWERS/TSTMS WILL HEAD OFFSHORE LATE THIS AFTERNOON. ADDITIONAL
TSTMS FORMING ACROSS NE PA/UPSTATE NY ARE EXPECTED TO AFFECT
INTERIOR SOUTHERN NEW ENGLAND THIS EVENING AND SHOULD NOT MAKE IT
TO COASTAL WATERS.

EXTENDING SCA FOR SEAS ON OUTER S COASTAL WATERS INTO TUE NIGHT...
AND ALSO ADDING RI SOUND PER MODEL GUIDANCE. INCREASING S/SW SWELL
EXPECTED TONIGHT INTO TUE WHICH WILL BUILD SEAS TO AS HIGH AS 6 FT
OFFSHORE.

OTHERWISE WINDS AND SEAS WILL REMAIN BELOW SCA THROUGH TUE NIGHT.
WEAK COOL FRONT WILL BRING WIND SHIFT TO W/NW OVERNIGHT...BEFORE
WINDS VEER TO E/NE TUE. GRADIENT REMAINS WEAK ENOUGH TO ALLOW FOR
LOCAL SEA BREEZES TUE AFTERNOON.

OUTLOOK...WEDNESDAY THROUGH SATURDAY...

PERSISTENT SOUTHWEST FLOW WILL BRING SWELLS OF 4 TO 6 FEET ACROSS
THE SOUTH COASTAL WATERS...MAINLY THE OUTER WATERS. THESE SEA
CONDITIONS SHOULD LINGER THROUGH WEDNESDAY AFTERNOON BEFORE
DIMINISHING. WIND/WAVE HEIGHTS SHOULD BE MINIMAL.

SEAS MAY INCREASE AGAIN OVER THE WEEKEND AS STRONG LOW PRESSURE
MOVES ACROSS THE GREAT LAKES AND INTO NORTHERN NEW ENGLAND.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
MA...NONE.
NH...NONE.
RI...NONE.
MARINE...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS UNTIL MIDNIGHT EDT
     TUESDAY NIGHT FOR ANZ235-254>256.

&&

SYNOPSIS...EKSTER/NMB
NEAR TERM...JWD
SHORT TERM...FRANK
LONG TERM...EKSTER
AVIATION...EKSTER/JWD
MARINE...EKSTER/JWD

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAUNTON MA
409 PM EDT MON JUL 19 2010

CTZ002>004-MAZ002>024-026-NHZ011-012-015-RIZ001>008-202015-
HARTFORD CT-TOLLAND CT-WINDHAM CT-WESTERN FRANKLIN MA-
EASTERN FRANKLIN MA-NORTHERN WORCESTER MA-CENTRAL MIDDLESEX MA-
WESTERN ESSEX MA-EASTERN ESSEX MA-WESTERN HAMPSHIRE MA-
WESTERN HAMPDEN MA-EASTERN HAMPSHIRE MA-EASTERN HAMPDEN MA-
SOUTHERN WORCESTER MA-WESTERN NORFOLK MA-SOUTHEAST MIDDLESEX MA-
SUFFOLK MA-EASTERN NORFOLK MA-NORTHERN BRISTOL MA-
WESTERN PLYMOUTH MA-EASTERN PLYMOUTH MA-SOUTHERN BRISTOL MA-
SOUTHERN PLYMOUTH MA-BARNSTABLE MA-DUKES MA-NANTUCKET MA-
NORTHERN MIDDLESEX MA-CHESHIRE NH-EASTERN HILLSBOROUGH NH-
WESTERN AND CENTRAL HILLSBOROUGH NH-NORTHWEST PROVIDENCE RI-
SOUTHEAST PROVIDENCE RI-WESTERN KENT RI-EASTERN KENT RI-BRISTOL RI-
WASHINGTON RI-NEWPORT RI-BLOCK ISLAND RI-
409 PM EDT MON JUL 19 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN
CONNECTICUT...CENTRAL MASSACHUSETTS...EASTERN
MASSACHUSETTS...NORTHEASTERN MASSACHUSETTS...SOUTHEASTERN
MASSACHUSETTS...WESTERN MASSACHUSETTS...SOUTHERN NEW
HAMPSHIRE...NORTHERN RHODE ISLAND AND SOUTHERN RHODE ISLAND.

.DAY ONE...TONIGHT.

THERE IS A CHANCE OF SCATTERED SEVERE THUNDERSTORMS DURING THE
REMAINDER OF THIS AFTERNOON AND THIS EVENING. THE BEST CHANCE WILL BE
IN THE INTERIOR. DAMAGING WIND WILL BE THE MAIN THREAT FROM THESE
THUNDERSTORMS...ALTHOUGH ISOLATED OCCURRENCES OF LARGE HAIL ARE
POSSIBLE.

HEAVY DOWNPOURS FROM AFTERNOON AND EVENING THUNDERSTORMS MAY
CAUSE URBAN AND POOR DRAINAGE FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

HEAVY DOWNPOURS FROM THUNDERSTORMS ARE AGAIN POSSIBLE LATER
TUESDAY NIGHT AND WEDNESDAY MORNING. THIS WILL AGAIN BRING THE
POTENTIAL FOR URBAN AND POOR DRAINAGE FLOODING.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

ANZ230>237-250-251-254>256-202015-
BOSTON HARBOR-CAPE COD BAY-NANTUCKET SOUND-VINEYARD SOUND-
BUZZARDS BAY-RHODE ISLAND SOUND-NARRAGANSETT BAY-BLOCK ISLAND SOUND-
COASTAL WATERS EAST OF IPSWICH BAY AND THE STELLWAGEN BANK NATIONAL
MARINE SANCTUARY-MASSACHUSETTS BAY AND IPSWICH BAY-
COASTAL WATERS FROM PROVINCETOWN MA TO CHATHAM MA TO NANTUCKET MA
OUT 20 NM-
COASTAL WATERS EXTENDING OUT TO 25 NM SOUTH OF MARTHAS VINEYARD AND
NANTUCKET-
COASTAL WATERS FROM MONTAUK NY TO MARTHAS VINEYARD EXTENDING OUT TO
20 NM SOUTH OF BLOCK ISLAND-
409 PM EDT MON JUL 19 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MASSACHUSETTS COASTAL WATERS
AND RHODE ISLAND COASTAL WATERS.

.DAY ONE...TONIGHT.

ISOLATED STRONG THUNDERSTORMS MAY MOVE ACROSS THE WATERS LATE THIS
AFTERNOON AND EVENING. LIGHTNING AND STRONG WIND GUSTS WOULD BE
THE CHIEF HAZARDS FROM THESE STORMS.

AREAS OF FOG MAY CAUSE LOW VISIBILITY AFTER MIDNIGHT TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

AREAS OF FOG MAY CAUSE LOW VISIBILITY EACH LATE NIGHT AND EARLY
MORNING THROUGH FRIDAY.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
633 PM EDT MON JUL 19 2010

MAZ003-004-NHZ011-015-192315-
CHESHIRE NH-EASTERN FRANKLIN MA-NORTHERN WORCESTER MA-WESTERN AND
CENTRAL HILLSBOROUGH NH-
633 PM EDT MON JUL 19 2010

AT 626 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL OVER RICHMOND...
OR ABOUT 12 MILES WEST OF JAFFREY...MOVING EAST AT 25 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...TROY...FITZWILLIAM...RINDGE...
  JAFFREY...PETERBOROUGH...SHARON AND NEW IPSWICH.

FOR YOUR SAFETY...GET INSIDE WHEN THIS STORM APPROACHES. WINDS MAY BE
STRONG ENOUGH TO BRING DOWN SMALL BRANCHES. MINOR STREET FLOODING AND
PONDING OF WATER IN POOR DRAINAGE AREAS IS ALSO POSSIBLE.

&&

LAT...LON 4293 7189 4273 7183 4269 7231 4283 7240

MLE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
635 PM EDT MON JUL 19 2010

MAZ002-003-008-192300-
EASTERN FRANKLIN MA-WESTERN FRANKLIN MA-WESTERN HAMPSHIRE MA-
635 PM EDT MON JUL 19 2010

AT 630 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL 2 MILES WEST OF
HAWLEY...OR ABOUT 12 MILES SOUTHEAST OF NORTH ADAMS...MOVING EAST AT
30 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...ASHFIELD...BUCKLAND...CONWAY...
  SHELBURNE...COLRAIN...LEYDEN...GREENFIELD AND DEERFIELD.

FOR YOUR SAFETY...GET INSIDE WHEN THIS STORM APPROACHES. WINDS MAY BE
STRONG ENOUGH TO BRING DOWN SMALL BRANCHES. MINOR STREET FLOODING AND
PONDING OF WATER IN POOR DRAINAGE AREAS IS ALSO POSSIBLE.

&&

LAT...LON 4264 7296 4271 7256 4249 7256 4251 7298
      4254 7298 4255 7298

MLE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
652 PM EDT MON JUL 19 2010

NHZ012-015-200000-
EASTERN HILLSBOROUGH NH-WESTERN AND CENTRAL HILLSBOROUGH NH-
652 PM EDT MON JUL 19 2010

AT 649 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZED HAIL 3 MILES
SOUTH OF PETERBOROUGH...OR ABOUT 3 MILES NORTHEAST OF JAFFREY...
MOVING NORTHEAST AT 25 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...SHARON...TEMPLE...GREENFIELD...
  WILTON...LYNDEBOROUGH...FRANCESTOWN...MONT VERNON...AMHERST AND NEW
  BOSTON.

FOR YOUR SAFETY...GET INSIDE WHEN THIS STORM APPROACHES. WINDS MAY BE
STRONG ENOUGH TO BRING DOWN SMALL BRANCHES. MINOR STREET FLOODING AND
PONDING OF WATER IN POOR DRAINAGE AREAS IS ALSO POSSIBLE.

&&

LAT...LON 4305 7171 4288 7157 4279 7196 4281 7198
      4290 7200 4292 7200

MLE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
703 PM EDT MON JUL 19 2010

NHZ015-200000-
WESTERN AND CENTRAL HILLSBOROUGH NH-
703 PM EDT MON JUL 19 2010

AT 702 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CAPABLE OF PRODUCING WIND GUSTS TO 40 MPH AND
PENNY SIZED HAIL 20 MILES WEST OF WEARE...OR ABOUT 14 MILES WEST OF
HENNIKER...MOVING EAST AT 30 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...WEARE.

FOR YOUR SAFETY...GET INSIDE WHEN THIS STORM APPROACHES. WINDS MAY BE
STRONG ENOUGH TO BRING DOWN SMALL BRANCHES. MINOR STREET FLOODING AND
PONDING OF WATER IN POOR DRAINAGE AREAS IS ALSO POSSIBLE.

&&

LAT...LON 4312 7185 4315 7167 4314 7165 4309 7164
      4313 7204 4318 7204 4319 7201 4321 7191

MLE

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