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Area Forecast Discussion
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000
FXUS61 KBTV 222332
AFDBTV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
732 PM EDT WED OCT 22 2014

.SYNOPSIS...
SLOW MOVING LOW PRESSURE JUST OFF THE COAST OF NEW ENGLAND WILL
KEEP THE AREA IN A CLOUDY, DAMP AND COOL WEATHER PATTERN INTO
FRIDAY, THOUGH SHOWERS ARE STILL POSSIBLE OVER THE WEEKEND. WARMER
AND DRIER WEATHER WILL RETURN EARLY NEXT WEEK.

&&

.NEAR TERM /UNTIL 8 AM THURSDAY MORNING/...
AS OF 718 PM EDT WEDNESDAY...LITTLE OVERALL CHANGE TO PREVIOUS
FORECAST. STRENGTHENING LOW PRESSURE EAST OF THE DELMARVA
PENINSULA WILL RESULT IN STRENGTHENING LOW-LEVEL NE-EASTERLY FLOW
ACROSS THE NORTH COUNTRY DURING THE OVERNIGHT/PRE-DAWN HOURS.
CLOUD CANOPY ASSOCIATED WITH OFFSHORE LOW AND ASSOCIATED CYCLONIC
CIRCULATION ENCOMPASSES THE NORTH COUNTRY...BUT GENERALLY LOOKING
AT MID-UPPER LEVEL CLOUDS FROM THE CHAMPLAIN VALLEY WWD. LOW-LEVEL
MOISTURE/CLOUD COVER IS MORE EXTENSIVE WITH UPSLOPE COMPONENT EAST
OF THE GREEN MOUNTAIN SPINE THIS EVENING. COMPOSITE RADAR
REFLECTIVITY AT 2315UTC INDICATES BANDS OF RAIN SHOWERS...WHICH WILL
CONTINUE TO TRANSLATE FROM EAST TO WEST FROM NH INTO VERMONT
OVERNIGHT...WITH A GRADUAL WESTWARD PROGRESSION OF THE ACTIVITY
THROUGH THE CHAMPLAIN VALLEY AND EVENTUALLY INTO THE NORTHERN
ADIRONDACKS AFTER MIDNIGHT. POP FIELDS DEPICT THIS INCREASE OF
POPS FROM EAST TO WEST. THE ST LAWRENCE VALLEY SHOULD REMAIN DRY
FOR A GOOD CHUNK OF THE NIGHT.

TEMPERATURES WILL NOT DEVIATE MUCH ACROSS THE REGION, NOR WILL
THEY DROP MUCH GIVEN NEAR SATURATION AND OVERCAST CONDITIONS. LOWS
WILL GENERALLY BE IN THE MID 40S. SOME PATCHY FOG IS EXPECTED TO
DEVELOP EAST OF/ALONG THE GREENS...ESPECIALLY AS RAIN INCREASES
AFTER MIDNIGHT. 

RAINFALL AMOUNTS THROUGH DAWN THURSDAY WILL RANGE FROM 0.20-0.40"
ACROSS CENTRAL/SERN VT...0.10-0.20" ACROSS RUTLAND COUNTY AND MUCH
OF THE CHAMPLAIN VALLEY...AND GENERALLY <0.10" ACROSS THE
REMAINDER OF NORTHERN NEW YORK. 

&&

.SHORT TERM /8 AM THURSDAY MORNING THROUGH FRIDAY NIGHT/...
AS OF 400 PM EDT WEDNESDAY...STILL LOOKING WET, ESPECIALLY
THURSDAY. THE PRECIPITATION SHIELD IS EXPECTED TO BE COVERING ALL
OF VERMONT AND MUCH OF NORTHERN NY BY FIRST THING THURSDAY. AS THE
SURFACE AND UPPER LOW SLOWLY START MOVING NORTHEAST, WE SHOULD SEE
AN AREA OF RAINFALL MOVE INTO NORTHERN VERMONT AND THEN BEGIN TO
PIVOT AND SLOWLY MOVE EAST. SOME OF THIS RAIN WILL BE MODERATE TO
PERHAPS BRIEFLY HEAVY. ANTICIPATE UPWARDS OF 1" OF RAIN IN AREAS
TOMORROW. BY THE TIME MOST OF THE RAIN WINDS DOWN THURSDAY NIGHT
AND EARLY FRIDAY, WE ARE LOOKING FOR ABOUT 1.5" (MUCH LESS IN THE
ST LAWRENCE VALLEY) TOTALS, HOWEVER WE ARE NOT ANTICIPATING ANY
FLOODING ISSUES. 

HIGHS TOMORROW SHOULD BE VERY SIMILAR TO TODAY AS THE CLOUDS AND
RAIN HOLD TEMPERATURES DOWN. IN FACT, I TRIED TO INDICATE DIURNAL
SWINGS OF 5 DEGREES OR LESS. 

THURSDAY NIGHT THROUGH FRIDAY WILL FEATURE SLOW IMPROVEMENT AS THE
SLOW MOVING LOW SLOWLY PUSHES NORTHEAST AWAY FROM THE AREA.
CYCLONIC FLOW WILL CONTINUE, AND WITH LOTS OF LOW LEVEL MOISTURE
AROUND, HAVE CONTINUED THE IDEA FOR 30-45% POPS AND A TON OF
CLOUDS. STILL LITTLE TEMPERATURE VARIATION.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
AS OF 320 PM EDT WEDNESDAY...NORTHWEST FLOW DEVELOPING AT 500 MB
FROM 12Z SATURDAY ONWARD. WEAK SHORTWAVE RIDGING OVER THE FORECAST
AREA STARTING AT 12Z FOR A DRY START TO THE WEEKEND...BUT LOW
PRESSURE IN NW FLOW MOVING ACROSS OTTAWA WILL BEGIN TO MAKE ITS
PRESENCE FELT LATE SATURDAY. AREA STILL IN RELATIVELY WARM AIR AND
PRECIP TYPE TO BE ALL RAIN. FROM SUNDAY NIGHT ONWARD SURFACE AND
UPPER RIDGE SETTLES OVER THE AREA WITH DRY AND SEASONAL
CONDITIONS. TOWARD MID WEEK THE RIDGE BREAKS DOWN WITH THE NEXT
LOW TRACKING ALONG THE US CANADIAN BORDER AND SURFACE LOW/COLD
FRONT COMBO. GFS AND ECMWF IN GOOD AGREEMENT WITH TRACK OF SURFACE
LOW MOVING NORTH OF FORECAST AREA...AND TRAILING COLD FRONT
BRINGING NEW CHANCE OF RAIN FOR WEDNESDAY.

TEMPS START OFF NEAR NORMAL WITH HIGHS IN THE 50S...THEN AS RIDGE
BUILDS IN TUESDAY TEMPS RISE INTO THE UPPER 50S AND LOWER 60S IN
THE WARMER VALLEYS.

&&

.AVIATION /23Z WEDNESDAY THROUGH MONDAY/...
STABLE PERSISTENT CONDITIONS ALL MORNING...MAINLY MVFR/IFR/LIFR
CEILINGS AND VFR VSBYS WILL EVENTUALLY DETERIORATE TONIGHT AS RAIN
BAND ADVECTS NW INTO FA. IFR-LIFR CIGS AND VFR-MVFR-IFR VSBYS TNGT
AND THU. NNE WINDS WILL IN THE 8-15 KNOT RANGE THRU THE PERIOD.

OUTLOOK 18Z THURSDAY THROUGH SUNDAY...

18Z THURS - 12Z FRI...PERIODS OF RAIN/SHOWERS WITH PREVAILING
MVFR/IFR CONDITIONS AS LOW PRESSURE LIFTS SLOWLY NORTHEAST ALONG
THE NEW ENGLAND COAST.

12Z FRI - 00Z SUN...SLOWLY IMPROVING CONDITIONS AS LOW PRESSURE MOVES
AWAY TO THE NORTHEAST AND COVERAGE OF RAIN DIMINISHES OVER TIME.
SOME LINGERING IFR/MVFR LIKELY EARLY IN THE PERIOD...TRENDING TO
MAINLY VFR AFTER 12Z SATURDAY.

&&

.HYDROLOGY...
AS OF 400 PM EDT WEDNESDAY...APPEARS THAT THE BULK OF THE RAINFALL
WILL OCCUR LATE TONIGHT THROUGH THURSDAY. WITH LESS RAIN FALLING
TODAY THAN EARLIER EXPECTED, OVERALL RAINFALL TOTALS BY FRIDAY
MORNING ARE LESS THAN WE THOUGHT AS OF A FEW DAYS AGO. GENERALLY
LOOKING AT ABOUT 1.5" FOR MUCH OF VERMONT (LOWER VALUES IN THE
NORTHEAST KINGDOM DUE TO RAIN SHADOWING FROM THE WHITE MOUNTAINS)
AND PERHAPS SPOT 2" AMOUNTS ALONG THE EASTERN SLOPES OF THE
CENTRAL GREEN MOUNTAINS. OUT IN THE ST LAWRENCE VALLEY, AMOUNTS
WILL BE MUCH LESS 1/2" OR LESS. GIVEN THE RELATIVE LONG DURATION
OF RAINFALL AND THE BASE LEVEL RIVER FLOWS, WE CERTAINLY EXPECT
RIVER LEVELS TO RISE, BUT NOT LOOKING FOR ANYTHING TO GO OUT OF
THEIR BANKS. PERHAPS THE WORST WE'LL SEE IS SOME PONDING ON ROADS
WHERE DRAINAGES HAVE BEEN BLOCKED BY LEAVES.

&&

.MARINE...
AS OF 400 PM EDT WEDNESDAY...NORTHERLY WINDS ARE EXPECTED TO
CONTINUE ALL NIGHT, ALL DAY THURSDAY AND EVEN INTO THURSDAY
EVENING OVER LAKE CHAMPLAIN, WITH SPEEDS IN THE 15-25KT RANGE.
STRONGEST OF THESE NORTHERLY WINDS WILL BE FOUND IN THE SOUTHERN
HALF OF THE LAKE. THESE WINDS SHOULD GENERATE CHOPPY 2-3 FOOT
WAVES. AS A RESULT, A LAKE WIND ADVISORY WILL BE IN EFFECT.

&&

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

&&

$$
SYNOPSIS...NASH
NEAR TERM...BANACOS/NASH
SHORT TERM...NASH
LONG TERM...HANSON
AVIATION...SLW
HYDROLOGY...NASH
MARINE...NASH



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