Area Forecast Discussion
Issued by NWS Burlington, VT

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000 FXUS61 KBTV 252219 AFDBTV AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BURLINGTON VT 619 PM EDT SAT OCT 25 2014 .SYNOPSIS... A STRONG UPPER LEVEL DISTURBANCE WILL DROP SOUTHEAST ACROSS THE REGION TONIGHT INTO SUNDAY ACCOMPANIED BY SOME SHOWERS AND HIGHER SUMMIT SNOW SHOWERS. PRECIPITATION TAPERS OFF BY SUNDAY NIGHT WITH HIGH PRESSURE RETURNING FOR MONDAY AND TUESDAY WITH GENERALLY DRY WEATHER AND MODERATING TEMPERATURES. && .NEAR TERM /UNTIL 7 AM SUNDAY MORNING/...
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AS OF 612 PM EDT SATURDAY...UPDATED THE FORECAST TO INCLUDE ISOLATED THUNDERSTORMS ACROSS NRN NEW YORK THROUGH 01Z. NATIONAL LIGHTNING DETECTION NETWORK SHOWING A FEW CG/S IN STRONGLY DIFLUENT REGION ACROSS ST. LAWRENCE AND FRANKLIN NY COUNTIES. THIS IS OCCURRING IN LEFT EXIT REGION OF 130-150 KT 300MB JET...AND STRONG MID-UPPER TROPOSHPERHIC HEIGHT FALLS. ASSOCIATED UVV IS MAKING BEST USE OF VERY MINIMAL CAPE PRESENT (GENERALLY 100 J/KG OR LESS PER SPC MESOANALYSIS). OTHERWISE...GIVEN STRENGTH OF UPWARD MOTION AND DYNAMICS ASSOCIATED WITH PROGRESSIVE SHORTWAVE TROUGH...DID BUMP UP THE QPF A BIT AS WELL AND INDICATED 90-100 POPS FOR A PERIOD OF 1-3 HOURS AS BEST FORCING WORKS ON THROUGH FROM WEST TO EAST. GENERALLY LOOKING AT 0.10-0.30" RAINFALL THROUGH MIDNIGHT. AS FLOW TRENDS WEST/NORTHWESTERLY ALOFT LATER TONIGHT...FREEZING LEVELS WILL DROP TO AROUND 3000 FT OR SO WITH PRECIPITATION MIXING WITH OR CHANGING TO SNOW AT THE SUMMIT LEVEL OR SLIGHTLY BELOW. LOWS FROM THE UPPER 30S TO MID 40S BELOW THE 2000 FT LEVEL. MAY SEE A DUSTING TO AN INCH OF SNOW BY DAYBREAK ACROSS THE HIGHER SUMMITS. ELSEWHERE...GENERALLY DRY WITH A BRIEF SPRINKLE OR TWO POSSIBLE. THE OROGRAPHICALLY FAVORED W-NW SLOPES OF THE ADIRONDACKS AND CENTRAL TO NORTHERN GREEN MOUNTAINS WILL HAVE THE BEST CHANCE OF SEEING ANY ADDITIONAL MEASUARABLE RAINFALL AFTER MIDNIGHT. EARLY MORNING LOWS GENERALLY 39-44F AT ELEVATIONS BELOW 1000 FEET.
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&& .SHORT TERM /7 AM SUNDAY MORNING THROUGH MONDAY NIGHT/...
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AS OF 345 PM EDT SATURDAY...FOR SUNDAY INTO SUNDAY EVENING WE REMAIN UNDER THE INFLUENCE OF THE UPPER LOW WITH CYCLONIC NORTHWEST FLOW ALOFT RESULTING IN PLENTY OF CLOUDS AND THE CONTINUED CHANCE FOR SHOWERS WITH SNOW SHOWERS OVER THE SUMMITS. FLOW WILL BECOME BLOCKED OVER TIME SUCH THAT SHOWER COVERAGE WILL BECOME INCREASINGLY CONFINED TO THE NORTHERN MOUNTAINS WHERE SOME LIGHT ADDITIONAL SNOWFALL STILL POSSIBLE ABOVE AROUND 2500 FT. HIGH TEMPERATURES WILL ONLY BE IN THE MID 40S TO LOWER 50S WITH LOWS SUNDAY NIGHT IN THE MID 30S TO AROUND 40. IMPROVING CONDITIONS DURING MONDAY AS UPPER LOW MOVES AWAY FROM REGION UP THROUGH CANADIAN MARITIMES. THIS ALLOWS FOR UPPER LEVEL RIDGING OVER THE GREAT LAKES TO BUILD INTO THE NORTHEAST ALONG WITH WEAK SURFACE RIDGE AS WELL. THE RESULT WILL BE DIMINISHED NORTHWEST FLOW. STILL SOME LINGERING CLOUDS...ESPECIALLY OVER THE NORTH CENTRAL/NORTHEAST VERMONT WHERE A SPRINKLE WILL REMAIN POSSIBLE DURING THE FIRST HALF OF MONDAY ACROSS THE HIGHER TERRAIN. TEMPS NEAR SEASONAL LEVELS WITH HIGHS IN THE UPPER 40S TO MID 50S. SOME CLOUDS MONDAY NIGHT AS RIDGE MOVES EAST OF THE AREA LATE. LOWS WILL BE IN THE MID 30S TO LOWER 40S.
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&& .LONG TERM /TUESDAY THROUGH SATURDAY/... AS OF 315 PM EDT SATURDAY...EXTENDED PERIOD STARTS OFF WITH AREA UNDER VERTICALLY STACKED RIDGE FROM SURFACE UP THROUGH 500 MB. RIDGE SHIFTS EAST DURING THE DAY TUES WITH SOUTHERLY FLOW DEVELOPING AHEAD OF NEXT LOW. 850 MB TEMPS MAX OUT AROUND +12C DURING THE DAY TUESDAY. BUMPED UP MAX FORECASTS A BIT, BUT 850 TEMPS COULD SUPPORT TEMPS EVEN WARMER THAN THE 60S ALREADY FORECAST...WILL NEED TO WATCH TO SEE IF TREND PERSISTS. TIMING FOR COLD FRONTAL PASSAGE LATE TUESDAY NIGHT/EARLY WEDNESDAY MORNING STILL ON TRACK. GFS AND ECMWF IN GOOD AGREEMENT WITH NARROW BAND OF SHOWERS RIGHT ALONG THE FRONT...FOR A QUICK HIT OF RAINFALL AT FROPA. LOW LEVEL WINDS TURN MORE WESTERLY/NORTHWEST TO BEGIN COLD AIR ADVECTION IN EARNEST. TEMPERATURES TREND DOWNWARD THROUGH REST OF EXTENDED PERIOD TO NEAR SEASONAL NORMALS. WITH WEST TO NW FLOW AND LOW LEVEL HUMIDITY WILL GET SOME TERRAIN INFLUENCED RAIN AND/OR SNOW SHOWERS LINGERING MAINLY OVER THE HIGHER TERRAIN. LATE IN THE EXTENDED TOWARDS SATURDAY MODELS BRING DEEP TROUGH INTO THE EASTERN US WITH CUT OFF LOW SLOWLY MOVING THROUGH THE REGION. MODELS DIFFER WITH THIS FEATURE AS GFS KEEPS IT MORE PROGRESSIVE AND MOVING EAST IN NORTHERN STREAM...WHILE ECMWF DIGS IT FURTHER SOUTH. ECMWF HAS TRENDED TOWARD GFS SOLUTION BETWEEN 00 AND 12Z RUNS...AND GIVEN THIS TREND PUTTING MORE WEIGHT ON THE GFS FOR FRIDAY INTO SATURDAY. POPS COME UP TO CHANCE CATEGORY LATE FRIDAY AND CONTINUE INTO SATURDAY. PRECIP TYPE TO START OFF AS RAIN ON FRIDAY THEN AS TEMPERATURES COOL FRIDAY NIGHT CHANGE TO SNOW DURING OVERNIGHT HOURS. && .AVIATION /22Z SATURDAY THROUGH THURSDAY/... THROUGH 18Z SUNDAY...VFR THROUGH THE REST OF THE AFTERNOON...ALTHOUGH BAND OF RAIN APPROACHING ALONG COLD FRONT. FORECAST TO REACH ST. LAWRENCE VALLEY 19Z...CHAMPLAIN VALLEY 21-22Z AND THEN INTO EASTERN VERMONT. UPSTREAM OBS AND RADAR INDICATE VIS TO REMAIN VFR IN PRECIP. AFTER PRECIP/FRONTAL PASSAGE MOISTURE TRAPPED BELOW FRONTAL INVERSION WITH MVFR CIGS. WINDS SHIFT TO SOUTHWEST THIS AFTERNOON THEN WEST AFT 00Z. OVERNIGHT INTO SUNDAY TERRAIN INDUCED RW/SW WILL BE OVER THE MOUNTAINS BUT GENERALLY AWAY FROM TAF SITES SO DID NOT INCLUDE TAFS. OUTLOOK 18Z SUNDAY THROUGH THURSDAY... 12Z SUNDAY - 12Z MONDAY...A MIX OF MVFR AND VFR ASSOCIATED WITH A SECOND ROUND OF VALLEY RAIN SHOWERS AND MOUNTAIN SNOW SHOWERS BEHIND AN EXITING FRONT ON NORTHWEST FLOW. 12Z MONDAY - 06Z WEDNESDAY...VFR UNDER BUILDING HIGH PRESSURE. 06Z WEDNESDAY - 00Z THURSDAY...VFR WITH SOME AREAS OF MVFR IN RAIN SHOWERS AS A COLD FRONT MOVES THROUGH THE REGION. 00Z THURSDAY-00Z FRIDAY...MVFR CIGS IN NORTHWEST FLOW AND SCATTERED RAIN OR SNOW SHOWERS OVER HIGHER TERRAIN. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...NONE. NY...NONE. && $$ SYNOPSIS...RJS NEAR TERM...BANACOS SHORT TERM...RJS LONG TERM...HANSON AVIATION...HANSON

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