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Area Forecast Discussion
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000
FXUS61 KBTV 212006
AFDBTV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
ISSUED BY NATIONAL WEATHER SERVICE ALBANY NY
406 PM EDT TUE OCT 21 2014

.SYNOPSIS...
WET AND UNSETTLED WEATHER WILL IMPACT NORTHERN NEW YORK AND UPSTATE 
VERMONT THE NEXT SEVERAL DAYS. LOW PRESSURE WILL FORM NEAR THE NEW 
JERSEY SEABOARD TONIGHT...AND SLOWLY MOVE NORTHEAST TOWARDS CAPE COD 
BY THURSDAY.  EXPECT SCATTERED TO NUMEROUS SHOWERS TO TRANSITION TO 
A STEADY RAINFALL BY WEDNESDAY NIGHT AND CONTINUING THROUGH 
THURSDAY. THE CYCLONE WILL CONTINUE TO SLOWLY MOVE TOWARDS NOVA 
SCOTIA BY FRIDAY WITH SHOWERS PERSISTING.

&&

.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
AS OF 406 PM EDT...AN H500 UPPER LEVEL LOW CONTINUES TO DIG S/SE
FROM THE LOWER GREAT LAKES REGION AND THE UPPER MID ATLANTIC
REGION TOWARDS THE EAST COAST. A TROUGH OF LOW PRESSURE AT THE SFC
CONTINUES TO EVOLVE INTO A COASTAL LOW NEAR THE MID ATLANTIC COAST
LATE THIS AFTERNOON. AS MORE SHORT-WAVE ENERGY SHIFTS TO THE MID
ATLANTIC REGION TONIGHT...LOW PRESSURE WILL FORM. THE VORTICITY
ADVECTION ASSOCIATED WITH THE MAIN UPPER LEVEL LOW...THE WEAK SFC
TROUGH...AND A DIFFUSE FRONTAL BOUNDARY NEAR THE ST LAWRENCE RIVER
VALLEY WILL KEEP SCT-NUMEROUS SHOWERS AROUND EARLY THIS EVENING
THAT WILL TAPER TO SCT SHOWERS AFTER MIDNIGHT.

THE TREND WILL BE FOR THE UPPER LEVEL LOW TO CLOSE AND CUT-OFF NEAR 
THE DELMARVA REGION BY DAYBREAK.  A CONVEYOR BELT OF ATLANTIC 
MOISTURE WILL BEGIN TO APPROACH ERN NEW ENGLAND BY 12Z/WED.  COOL AND 
DAMP CONDITIONS ARE EXPECTED TONIGHT WITH LOWS IN THE 40S WITH
CLOUDY CONDITIONS.

&&

.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH THURSDAY NIGHT/...
AS OF 406 PM EDT TUESDAY...

TOMORROW...THE CUTOFF LOW REACHES THE DELMARVA REGION...AND COASTAL 
LOW PRESSURE SLOWLY LIFTS N/NE FROM SE NJ.  A STRONG LOW-LEVEL JET 
WILL HELP ADVECT ATLANTIC MOISTURE INTO VT AND THE CHAMPLAIN VALLEY 
BY THE AFTERNOON.  SCT SHOWERS WILL BEGIN TO BE MORE NUMEROUS.  IT 
WILL BE BREEZY AND COOL...AND THE POPS WERE INCREASE TO LIKELY 
VALUES BY THE AFTERNOON.  HIGHS WILL ONLY BE  IN THE LOWER TO MID 
40S ACROSS THE MTNS...AND U40S TO L50S IN THE VALLEYS.

WED NIGHT INTO THU...A SLUG OF ATLANTIC MOISTURE PIVOTS INTO THE 
REGION AHEAD OF THE STACKED LOW PRESSURE SYSTEM.  THE OCCLUDED 
CYCLONE WILL BE A SLOW MOVER AND ANOMALOUS PWAT AIR /1 TO 3
STANDARD DEVIATIONS ABOVE NORMAL/ WILL MOVE OVER VT AND NRN NY.
THE EASTERLY H850 LLJ CRANKS UP TO 40-60 KTS. SOME ENHANCEMENT OF
THE RAINFALL IS EXPECTED ALONG THE ERN SLOPES OF THE GREENS AND
DACKS. PERIODS OF MDT-HVY RAINFALL WILL BE POSSIBLE. FOR
NOW...HAVE PHRASED AS MDT RAINFALL IN THE GRIDS. THE POTENTIAL
ALSO EXISTS FOR SOME DOWNSLOPING IN THE ST LAWRENCE AND CHAMPLAIN
VALLEYS. TOTAL RAINFALL DURING THIS 24-HR STRETCH COULD BE IN THE
HALF AN INCH TO INCH AND A HALF RANGE WITH LOCALLY HIGHER AMOUNTS.
LOWS WED NIGHT WILL BE IN U30S TO M40S IN THE DANK AIR MASS. HIGHS
WILL BE COOL ON THU IN THE L40S OVER THE HIGH PEAKS TO THE L50S IN
THE VALLEYS.

THU NIGHT...THE SYSTEM BECOMES EQUIVALENT BAROTROPIC IN STRUCTURE 
WITH DIFFERENTIAL VORTICITY ADVECTION ENHANCING THE PCPN OVER THE 
REGION.  THE ECMWF/GFS INDICATE INTERMITTENT SHOWERS WILL BE 
POSSIBLE DURING THIS TIME FRAME...AS THE OCCLUDED CYCLONE MEANDERS 
OVER CAPE COD.  LOWS WILL BE IN THE U30S TO L40S OVER THE FCST AREA.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
AS OF 206 PM EDT TUESDAY...THE EXTENDED PORTION OF THE FORECAST
CONTINUES TO BE UNSETTLED EARLY ON...BUT A TREND TO FAIR AND DRY
WEATHER IS EXPECTED LATE IN THE WEEKEND INTO EARLY NEXT WEEK WITH
ABOVE NORMAL TEMPS.

GENERALLY FOLLOWED CLOSE TO THE WPC GUIDANCE IN TERMS OF TEMPS IN
THE LONG TERM...WITH SOME SLIGHT CHANGES IN POPS AND WX BASED ON A
BLEND TO THE GFS/ECMWF GUIDANCE.

FRI-FRI NIGHT...THE OCCLUDED LOW SLOWLY LIFTS N/NE FROM NEAR CAPE
COD. THIS STACKED SYSTEM CONTINUES TO MEANDER TOWARDS THE GULF OF
MAINE AND NOVA SCOTIA BY NIGHTFALL. SOME ATLANTIC MOISTURE WILL
WRAP AROUND THE SYSTEM FOR SCT TO NUMEROUS SHOWERS ON FRIDAY. THE
HIGHER POPS ARE ACROSS THE NORTH COUNTRY OF NY AND THE NRN
PORTIONS OF VT.  SEVERAL SPOKES OF SHORT WAVE ENERGY WILL SPIRAL
AROUND THE SYSTEM...AND THERE COULD BE SOME W/NW UPSLOPE OROGRAPHIC
ENHANCEMENT OFF THE GREEN MTNS AND NRN DACKS. AN ADDITIONAL
QUARTER TO HALF AN INCH OF RAIN MAY OCCUR BEFORE MIDNIGHT. THE
SHOWERS SHOULD DIMINISH OVERNIGHT WITH THE CYCLONE SLOWLY PULLING
AWAY. HIGHS WILL BE IN THE MID TO U40S OVER THE MTNS...AND LOWER
TO M50S IN THE VALLEYS. LOWS WILL RANGE FROM THE MID 30S TO M40S.

SAT-SUN NIGHT...UNFORTUNATELY ONE UPPER LOW FINALLY BEGINS TO MOVE
AWAY...AND ANOTHER ONE DESCENDS S/SE FROM ONTARIO/HUDSON BAY.
THERE MAY INITIALLY BE A BRIEF BREAK IN THE SHOWERS...BUT THIS
NEXT UPPER LOW MOVES QUICKLY SOUTHWARD. THE ECMWF IS A LITTLE MORE
AGGRESSIVE THAN THE GFS. SLIGHT TO LOW CHANCES OF SHOWERS WERE
PLACED IN THE FCST SATURDAY AFTERNOON. THE HIGHER POPS WERE PLACED
FROM RUTLAND AND LAKE CHAMPLAIN NORTH AND EAST. THERE IS A BETTER
CHANCE OF SHOWERS SATURDAY NIGHT.  A FEW SNOW SHOWERS WILL BE
POSSIBLE FOR THE HIGH PEAKS...AS THE H850 TEMPS FALL TO 0 TO +2C
AS THE COLD FRONT MOVES THROUGH QUICKLY. THE SHOWERS SHOULD TAPER
OFF SUNDAY MORNING...WITH MAINLY ISOLD SHOWERS OR SPRINKLES SUNDAY
AFTERNOON ESPECIALLY OVER NRN NY...AND WEST OF THE GREEN MTNS.
SOME OROGRAPHICALLY ENHANCED SHOWERS IN THE W/NW FLOW WILL PERSIST
ALONG THE WRN SPINE OF THE SRN GREENS. HIGHS BOTH DAYS WILL RANGE
FROM THE LOWER TO M50S IN THE VALLEYS /POSSIBLY A FEW U50S ON
SAT/...AND 40S TO L50S OVER THE MTNS. LOWS SATURDAY/SUNDAY NIGHT 
WILL BE IN THE 30S TO L40S.

MON-TUE...IMPROVING WX TREND FOR NRN NY AND UPSTATE VT WITH SFC
HIGH PRESSURE BUILDING IN FROM THE OHIO VALLEY AND THE MID
ATLANTIC REGION TO OPEN THE WEEK. FAIR AND DRY WEATHER IS
EXPECTED...AND AS THE HIGH MOVES OFFSHORE TUESDAY...A RETURN S/SW
FLOW OF MILD AIR WILL IMPACT THE REGION. ACCORDING THE GFS H850
TEMPS SOAR BACK TO +12C TO +15C ON TUESDAY. ABOVE NORMAL TEMPS
ARE EXPECTED. HIGHS ON MONDAY WILL BE IN THE M50S TO L60S IN THE
VALLEYS...AND LOWER TO M50S OVER THE MTNS. A MILD AND BREEZY NIGHT
IS EXPECTED MONDAY NIGHT WITH LOWS IN THE MID TO U40S IN MOST
LOCATIONS EXCEPT L40S OVER THE HIGH PEAKS. TEMPS COULD BE 10 TO 15
DEGREES ABOVE NORMAL ON TUESDAY WITH WIDESPREAD LOWER TO
M60S...AND EVEN A FEW U60S IN THE VALLEYS. THE HIGH PEAKS WILL
EVEN BE IN MID TO U50S.

&&

.AVIATION /20Z TUESDAY THROUGH SUNDAY/...
INTERMITTENT PERIODS OF MVFR/IFR FLYING CONDITIONS WILL PERSIST 
THROUGH THE TAF PERIOD AS SCATTERED SHOWERS ACCOMPANYING AN 
UPPER-LEVEL LOW IMPACT THE REGION.

THIS AFTERNOON...SCATTERED SHOWERS WILL CONTINUE TO IMPACT TAF SITES 
BRINGING INTERMITTENT PERIODS OF MVFR/IFR CEILINGS...AND IFR 
VISIBILITIES AT KMPV. EXPECT CEILINGS TO BECOME PREDOMINATELY MVFR 
BETWEEN 1-3 KFT BY 21Z...WITH IFR CEILINGS EXPECTED AT KSLK AND VFR 
CEILINGS AT KRUT. WINDS WILL BE OUT OF THE NORTH/NORTHEAST BETWEEN 
6-12 KNOTS...EXCEPT FOR SOME OCCASIONAL LIGHT FLOW AT KBTV AND KRUT.

TONIGHT INTO WEDNESDAY...EXPECT MVFR CEILINGS TO CONTINUE THROUGH 
THE REMAINDER OF THE TAF PERIOD EXCEPT FOR IFR CEILINGS/VISIBILITIES 
AT KMPV OVERNIGHT. A BRIEF PERIOD OF VFR CEILINGS WILL BE POSSIBLE 
AT KMSS AFTER 12Z WITH SLIGHTLY DRIER AIR WORKING IN. WINDS WILL BE 
OUT OF THE NORTH/NORTHEAST AROUND 10 KNOTS.

OUTLOOK 18Z WEDNESDAY THROUGH SUNDAY...

18Z WED - 12Z FRI...PERIODS OF RAIN 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...
RIVERS ACROSS THE AREA ARE STARTING OUT LOW BEFORE THE START OF THE 
PRECIPITATION EVENT THE NEXT FEW DAYS. THE LARGER RIVERS ACROSS THE 
AREA ARE GENERALLY 5 TO 10 FEET BELOW NORMAL. TOTAL RAINFALL AMOUNTS 
WILL COME OVER A LONG PERIOD OF TIME...TODAY THROUGH FRIDAY...AND WE 
ARE LOOKING AT A GENERAL 1 TO 2 INCHES WITH SOME LOCALLY HIGHER 
AMOUNTS IN THE UPSLOPE REGIONS ALONG THE EAST SLOPES OF THE GREEN 
MOUNTAINS AND THE NORTHERN ADIRONDACKS OF NEW YORK. RIVER LEVELS 
WILL RISE AS A RESULT...BUT NO FLOODING IS EXPECTED AT THIS TIME. 
THE SITUATION WILL CONTINUE TO BE MONITORED NONETHELESS OVER THE 
NEXT FEW DAYS.

&&

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

&&

$$

SYNOPSIS...WASULA
NEAR TERM...WASULA
SHORT TERM...WASULA 
LONG TERM...WASULA 
AVIATION...IRL 
HYDROLOGY...EVENSON/WASULA







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