Severe Thunderstorm Warning 55, NWS Burlington, VT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
958 AM EDT FRI JUL 18 2008

.SYNOPSIS...
THE POTENTIAL FOR STRONG TO SEVERE THUNDERSTORMS WILL EXIST
ACROSS THE NORTH COUNTRY...ESPECIALLY AREAS NEAR THE CANADIAN
BORDER LATER THIS AFTERNOON AND EVENING. THESE THUNDERSTORMS WILL
BE CAPABLE OF PRODUCING FREQUENT LIGHTNING...DAMAGING
WINDS...HAIL...AND LOCALIZED VERY HEAVY RAINFALL THIS AFTERNOON.
MEANWHILE...WEAK HIGH PRESSURE WILL BUILD INTO THE REGION LATER
TONIGHT AND THIS WILL BRING A RELATIVELY DRY DAY ON SATURDAY AND
INTO THE FIRST PART OF SUNDAY. HOWEVER...AN UPPER LEVEL TROUGH OF
LOW PRESSURE WILL BEGIN TO DEVELOP OVER NEW ENGLAND SUNDAY
AFTERNOON AND WILL BE SLOW TO MOVE EAST. THUS EXPECT AN UNSETTLED
PERIOD SUNDAY AFTERNOON THROUGH EARLY NEXT WEEK. TEMPERATURES WILL
BE AT OR SLIGHTLY ABOVE NORMAL TODAY THROUGH SUNDAY.

&&

.NEAR TERM /THROUGH TONIGHT/...
AS OF 1000 AM EDT FRIDAY...FCST CHALLENGE TODAY WL BE AREAL
COVERAGE/INTENSITY OF STORMS...FOLLOWED BY AMOUNT OF CLRING AND
IMPACTS ON TEMPS/INSTABILITY PARAMETERS THIS AFTN. RADAR SHOWS FIRST
LINE OF STORMS ASSOCIATED WITH MID/UPPER LVL VORT MOVING ACRS
STATIONARY BOUNDARY OVER NNY INTO CENTRAL/NORTHERN VT ATTM. THIS
BOUNDARY...ALONG WITH SEVERAL OUTFLOW BOUNDARIES FROM THIS
MORNINGS CONVECTION AND TRRN...WL SERVE AS A LLVL FOCUS FOR MORE
STORMS THIS AFTN. IN ADDITION...STRONG SFC HEATING DIFFERENTIAL
BOUNDARY WL DEVELOP ACRS CENTRAL/SOUTHERN VT THIS AFTN...HELPING
TO ENHANCE MORE LIFT. GIVEN...PLENTY OF BOUNDARIES ACRS OUR
CWA...NEXT QUESTION WL BE AMOUNT OF SFC HEATING AND DEVELOPMENT OF
SFC BASED INSTABILITY PARAMETERS. VIS SATL PIC SHOWS CLRING
DEVELOPING ACRS SLV AND WESTERN DACKS ATTM...AND LAPS DATA SHOWS
SFC BASED CAPE VALUES ALREADY CLIMBING ABOVE 1000 J/KG. FEEL THIS
CLRING WL EXPAND EAST...BASED ON WEAK RIBBON OF SUBSIDENCE/DRY AIR
ALOFT BEHIND FIRST S/W ENERGY. THIS CLRING WL ALLOW TEMPS TO
QUICKLY WARM INTO THE 80S ACRS CENTRAL/SOUTHERN VT AND MOST OF
NNY...CREATING SFC BASED CAPE VALUES BTWN 1000-1500 J/KG. IN
ADDITION TO SFC INSTABILITY THE LOW TO MID LVL WIND FIELDS ARE
VERY IMPRESSIVE ACRS OUR CENTRAL/NORTHERN CWA THIS AFTN. SOUNDINGS
SHOW 700MB WINDS NEAR 50 KNTS...WITH 800MB WINDS AROUND 40 TO 45
KNTS. THESE STRONG WIND PROFILES COMBINED WITH MID LVL DRYING AND
STEEP SFC TO 800MB LAPSE RATES SUPPORT THE POTENTIAL FOR STRONG
AND DAMAGING THUNDERSTORM WIND GUSTS THIS AFTN. FURTHERMORE...LLVL
BOUNDARIES WL ENHANCE THE 0-1KM SHEAR PARAMETERS AND SUPPORT SOME
ORGANIZED CELLS...WITH POTENTIAL FOR LARGE HAIL...GIVEN WET BULB
ZERO HGHTS AROUND 10KFT. WL MENTION LARGE HAIL/DAMAGING WINDS IN
ZNS...ALONG WITH HEAVY RAIN. FINAL ADJUSTMENT TO ZNS WL BE TO
INCREASE CLOUDS ACRS OUR CENTRAL/NORTHERN CWA...AND DECREASE TEMPS
BY SEVERAL DEGREES BASED ON EXPECTED CLOUD COVER.

WATER VAPOR IMAGERY SHOWS SHORTWAVE TROUGH MOVING OUT OF SOUTHEAST
ONTARIO PROVINCE AND INTO SOUTHWEST QUEBEC EARLY THIS MORNING.
THIS IS ENHANCING CONVECTION ACROSS SOUTHEAST ONTARIO AND WITH
WESTERLY FLOW...EXPECT THIS ACTIVITY TO MOVE ACROSS NORTHERN NEW
YORK AND NORTHERN VERMONT THROUGH THE MORNING HOURS. ONCE THIS
MOVES OUT OF THE AREA...THERE SHOULD BE ENOUGH TIME FOR THE AIR
MASS TO RECOVER. EXPECT TEMPERATURES IN THE 80S ALONG WITH LOW TO
MID 60 DEW POINTS TO CREATE SUFFICIENT INSTABILITY TO GENERATE
SOME THUNDERSTORMS. NOT MUCH IN THE WAY OF STEEP LAPSE RATES IN
THE MID LEVELS...THUS LOOKING AT MAYBE 500-1000 J/KG. DEW POINTS
IN FORECAST SOUNDINGS ARE WAY TOO HIGH...LOWER 70S...AND THUS FEEL
THAT TYPE OF INSTABILITY WILL NEVER REALLY MATERIALIZE. A MODERATE
TO STRONG WESTERLY FLOW ALOFT WILL EXIST ACROSS THE AREA CREATING
FAVORABLE DEEP LAYER SHEAR ACROSS THE NORTH COUNTRY. THIS COMBINED
WITH SUFFICIENT INSTABILITY WILL LEAD TO THE DEVELOPMENT OF
ORGANIZED STORMS LATER THIS AFTERNOON AND EVENING. UNIDIRECTIONAL
SHEAR SUGGESTS STRONG GUSTY WINDS FROM LINEAR CONVECTION WILL BE
THE MAIN THREAT. IN ADDITION...HIGHER PRECIPITABLE WATER AIR WILL
LEAD TO HEAVY DOWNPOURS AS WELL. WILL USE ENHANCED WORDING IN THE
ZONES TO HIGHLIGHT POTENTIAL FOR STRONG TO SEVERE STORMS. THREAT
OF CONVECTION SHOULD END AROUND MIDNIGHT.

&&

.SHORT TERM /SATURDAY THROUGH SUNDAY/...
AS OF 438 AM EDT FRIDAY...NORTHWEST FLOW ALOFT DEVELOPS ON
SATURDAY WHICH WILL HELP DRY THE AREA OUT AND LIMIT POTENTIAL FOR
CONVECTION. 850 MB TEMPERATURES WILL NOT DROP OFF TOO MUCH...THUS
STILL LOOKING AT HIGH TEMPERATURES GENERALLY IN THE 80S. THE MUCH
ANTICIPATED DEVELOPMENT OF AN UPPER LEVEL TROUGH OVER THE
NORTHEAST UNITED STATES LOOKS LIKE IT WILL START SUNDAY
AFTERNOON. AS A RESULT...AN INCREASED THREAT FOR SHOWERS AND
THUNDERSTORMS WILL EXIST AS DEEPER MOISTURE MOVES INTO THE REGION
AND DYNAMIC SUPPORT INCREASES. WILL MENTION A CHANCE OF SHOWERS
AND STORMS FOR SUNDAY WITH TEMPERATURES ONLY A COUPLE OF DEGREES
COOLER ON SUNDAY VERSUS SATURDAY.

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
AS OF 438 AM EDT FRIDAY...CONTINUE TO EXPECT UNSETTLED WEATHER
FOR THE EXTENDED PORTION OF THE FORECAST. SLOW MOVING LOW
PRESSURE SYSTEM WHICH AFFECTED THE AREA SUNDAY WILL STICK AROUND
THROUGH MONDAY. UPPER LEVEL FLOW BECOMES MORE PROGRESSIVE ON
SUNDAY NIGHT AND TROF TAKES SHAPE OVER THE GREAT LAKES ON MONDAY.
ON MONDAY EVENING SURFACE LOW MOVES OFF THE COAST OF NEW ENGLAND
AND UPPER LEVEL TROF BEGINS TO PUSH EAST. SOME RESIDUAL MOISTURE
REMAINS ACROSS THE AREA ON TUESDAY AND UPPER LEVEL LOW AND
ASSOCIATED TROF BECOME MORE ORGANIZED OVER THE GREAT LAKES AT
THIS TIME. LOW BECOMES VERY VERTICALLY STACKED AND GAINS STRENGTH
ON TUESDAY NIGHT AND APPROACHES THE AREA ON WEDNESDAY...WITH LOTS
OF MOISTURE STREAMS INTO THE AREA. THE SURFACE LOW WILL BE
CENTERED OVER OUR CWA ON WEDNESDAY NIGHT AND BE VERY SLOW TO MOVE
AWAY FROM THE AREA. LOW BEGINS TO DEPART NEW ENGLAND ON THURSDAY
AND WRAP AROUND MOISTURE WILL AFFECT THE AREA...UPPER LEVEL LOW
MOVES AWAY FROM THE AREA AS WELL. AS LOW MOVES EAST CHANCE FOR
SHOWERS WILL CONTINUE ACROSS THE AREA...HIGH PRESSURE WILL BUILD
INTO THE AREA ON FRIDAY. THROUGH THE EXTENDED THERE WILL
GENERALLY BE A CHANCE FOR SHOWERS DURING THE DAY...SHOWERS AND
THUNDERSTORMS IN THE AFTERNOON AND EVENING.

&&

.AVIATION /14Z FRIDAY THROUGH TUESDAY/...
THROUGH 12Z SATURDAY...SHRA AND TSRA MOVING ACROSS THE AREA THIS
MORNING WILL CONTINUE TO MOVE THROUGH THE AREA...THEN THERE WILL
BE A BREAK IN PRECIP BEFORE ANOTHER ROUND OF SHRA AND TSRA THIS
AFTERNOON. GUSTY WINDS ARE POSSIBLE IN AND AROUND THESE
STORMS...ALONG WITH LOWERED CEILINGS AND VISIBILITIES. CHANCES
FOR SHRA/TSRA INCREASE DURING THE DAY TODAY...WITH BEST CHANCES
BEING BTWN 14Z-20Z AS SHRTWV MOVES ACRS AREA...ESPECIALLY IN OUR
NORTHERN ZONES. PSBL MVFR CONDITIONS IN ANY SHRA/TSRA. LIGHT
WINDS TONIGHT WILL BECOME S-SW AROUND 10 KTS FRIDAY. HAVE ALSO
INCLUDED HZ FOR HUMID CONDITIONS ACROSS THE AREA. HAVE INCLUDED
BR FOR MPV...MSS AND SLK...OUR TYPICALLY FOG PRONE AREAS. ANY
TERMINAL THAT GETS A SOAKING TODAY WILL BE MORE LIKELY TO PRODUCE
BR AND FG OVERNIGHT.

12Z SATURDAY THROUGH TUESDAY...UNSETTLED WEATHER WILL CONTINUE
THROUGH THE PERIOD. IMPULSES WILL RIDE ALONG THE WESTERLY FLOW
ALOFT THRU SUNDAY...BRINGING SCT SHWRS/THNDSTRMS TO THE
REGION...ESPECIALLY TO NORTHERN SECTIONS DUE PROXIMITY WITH
LINGERING BOUNDARY NEAR THE INTERNATIONAL BORDER. THREAT OF MORE
SHWRS/THNDSTRMS CONTINUES MONDAY INTO TUESDAY AS DEEP UPPER LEVEL
TROUGH DEVELOPS OVER GRTLKS/NORTHEAST. PREVAILING CONDITIONS FOR
MUCH OF THE PERIOD WILL BE VFR/MVFR...BUT IFR IS POSSIBLE IN ANY
PRECIPITATION.

&&

.EQUIPMENT...
THE MASSENA ASOS WILL BE OUT OF SERVICE UNTIL FURTHER NOTICE.

&&

.BTV WATCHES/WARNINGS/ADVISORIES...
VT...NONE.
NY...NONE.

&&

SYNOPSIS...EVENSON
NEAR TERM...TABER
SHORT TERM...EVENSON
LONG TERM...JAN
AVIATION...JAN
EQUIPMENT...

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BURLINGTON VT
144 PM EDT FRI JUL 18 2008

NYZ026>031-034-035-087-VTZ001>012-016>019-191745-
NORTHERN ST. LAWRENCE-NORTHERN FRANKLIN-EASTERN CLINTON-
SOUTHEASTERN ST. LAWRENCE-SOUTHERN FRANKLIN-WESTERN CLINTON-
WESTERN ESSEX-EASTERN ESSEX-SOUTHWESTERN ST. LAWRENCE-GRAND ISLE-
WESTERN FRANKLIN-ORLEANS-ESSEX-WESTERN CHITTENDEN-LAMOILLE-CALEDONIA-
WASHINGTON-WESTERN ADDISON-ORANGE-WESTERN RUTLAND-WINDSOR-
EASTERN FRANKLIN-EASTERN CHITTENDEN-EASTERN ADDISON-EASTERN RUTLAND-
144 PM EDT FRI JUL 18 2008

...SEVERE THUNDERSTORM WATCH 698 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL
VERMONT...NORTHEAST VERMONT...NORTHWEST VERMONT AND SOUTHERN
VERMONT.

.DAY ONE...THIS AFTERNOON AND TONIGHT

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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

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