Area Forecast Discussion
Issued by NWS Burlington, VT

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000 FXUS61 KBTV 241951 AFDBTV AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BURLINGTON VT 351 PM EDT SUN MAY 24 2015 .SYNOPSIS... HIGH PRESSURE WILL MOVE EAST OF THE REGION TONIGHT. A STRONG WARM FRONT WILL PUSH THROUGH THE REGION MONDAY INTO MONDAY NIGHT WITH PERIODS OF SHOWERS AND PERHAPS A FEW THUNDERSTORMS. BEHIND THIS FRONT...A VERY WARM AND SUMMERLIKE AIRMASS WILL SURGE BACK INTO THE REGION ON TUESDAY. IT WILL REMAIN WARM FOR THE REST OF THE WEEK ALONG WITH DAILY CHANCES OF SCATTERED SHOWERS AND THUNDERSTORMS. && .NEAR TERM /UNTIL 8 AM MONDAY MORNING/...
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AS OF 348 PM EDT SUNDAY...AN ISOLATED SHOWER OR THUNDERSTORM IS POSSIBLE THIS EVENING...MAINLY ACROSS NORTHEASTERN VERMONT. OTHERWISE...EXPECT CLEAR TO PARTLY CLOUDY SKIES THROUGH THE FIRST HALF OF TONIGHT. CLOUDS WILL THEN INCREASE AND THICKEN OVERNIGHT WITH THE APPROACH OF A STRONG WARM FRONT FROM THE GREAT LAKES AND OHIO VALLEY REGION. A SHOWER IS POSSIBLE OVER FAR WESTERN PORTION OF FORECAST AREA TOWARDS MORNING...WITH REST OF REGION REMAINING DRY. TEMPERATURES CONTINUE TO TREND WARMER WITH OVERNIGHT LOWS RANGING FROM THE UPPER 40S TO THE UPPER 50S.
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&& .SHORT TERM /8 AM MONDAY MORNING THROUGH TUESDAY NIGHT/... AS OF 348 PM EDT SUNDAY...DURING MONDAY INTO MONDAY NIGHT WARM FRONTAL BOUNDARY SURGES INTO AND THROUGH THE NORTH COUNTRY FROM SOUTHWEST TO NORTHEAST ALONG WITH SCATTERED TO NUMEROUS SHOWERS. DEEPER MOISTURE AND BETTER ISENTROPIC LIFT STILL APPEARS TO BE OVER NORTHERN NEW YORK INTO NORTHERN VERMONT DURING THIS TIME FRAME AND HAVE INDICATED HIGHEST POPS IN THESE AREAS WHERE A PERIOD OF STEADIER RAIN IS POSSIBLE. ACCORDINGLY...STEEPENING LAPSE RATES AND MARGINAL INSTABILITY IN THE LOW TO MID-LEVELS MAY ALSO ALLOW FOR A FEW ISOLATED THUNDERSTORMS TO DEVELOP ON THE BACK SIDE OF THE FRONT ACROSS NORTHERN NEW YORK LATER MONDAY AFTERNOON AND ACROSS THE REST OF THE AREA MONDAY NIGHT. HIGH TEMPERATURES ON MONDAY GENERALLY IN THE LOWER TO MID 70S GIVEN CLOUD COVER AND PRECIPITATION...THOUGH SOME AREAS FAR SOUTH AND WEST COULD SEE READINGS REACH THE UPPER 70S TO NEAR 80 IF WARM FRONT MAKES IT THROUGH THESE AREA BY LATE AFTERNOON. WARM FRONT LIFTS NORTH AND EAST OF FORECAST AREA LATER MONDAY NIGHT INTO EARLY TUESDAY. RISK OF SHOWERS DECREASES WITH PARTLY SUNNY SKIES EXPECTED DURING TUESDAY ALONG WITH MUCH WARMER TEMPERATURES. 925 MB TEMPERATURES ARE PROGGED TO REACH +20 TO +23C WHICH WOULD SUPPORT MAX TEMPS IN THE VALLEYS WELL INTO THE 80S TO AROUND 90 DEGREES. MUCH OF THE DAY WILL BE DRY WITH LITTLE FORCING MECHANISM TO GENERATE PRECIPITATION. BUT THERE COULD BE A FEW WIDELY SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE AREA FROM EARLY AFTERNOON INTO THE NIGHT WITH SOME MODEST INSTABILITY AS FORECAST AREA WILL LIE IN A MODEST INSTABILITY/MOISTURE AXIS IN DEEP SOUTHWESTERLY FLOW ALOFT. TEMPS TUESDAY NIGHT QUITE MILD WITH MUCH OF THE REGION SEEING LOWS IN THE 60S. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... AS OF 335 PM EDT SUNDAY...RIDGE OF HIGH PRESSURE SLIDES INTO THE ATLANTIC ALLOWING FOR A PERIOD OF UNSETTLED WEATHER ACROSS THE NORTH COUNTRY WITH ABOVE NORMAL TEMPERATURES. SOUTHWEST FLOW AHEAD OF A COLD FRONT WILL FILTER IN 925MB TEMPERATURES UP TO 22C WITH PWATS GREATER THAN 1.5 INCHES AND INCREASING INSTABILITY WEDNESDAY. THE COLD FRONT WILL MOVE FROM NW TO SE ACROSS THE REGION, TRIGGERING SHOWERS AND THUNDERSTORMS WITH SOME BRIEF MODERATE TO HEAVY DOWNPOURS POSSIBLE. LIFTED INDICES OF - 2 INDICATED BY THE GFS AND ECMWF WITH SEVERAL HUNDRED J/KG OF CAPE AVAILABLE, ESPECIALLY IN THE AFTERNOON. DAYTIME MAX TEMPERATURES WILL REACH THE U70S-U80S WITH GUSTY SOUTHWEST WINDS. UPPER LEVEL SHORTWAVE ASSOCIATED WITH THE FRONT WILL LAG BEHIND, KEEPING CHANCE FOR SHOWERS WEDNESDAY NIGHT INTO THURSDAY, WITH THUNDERSTORMS POSSIBLE THURSDAY AFTERNOON. MIN TEMPERATURES WILL BE MILD IN THE 60S WITH THURSDAY MAX TEMPERATURES NOTICEABLY COOLER BUT STILL ABOVE NORMAL IN THE M70S-L80S. SLIGHT RIDGING MOVES OVER THE REGION LATE THURSDAY NIGHT INTO FRIDAY, PROVIDING A BREAK FROM SHOWERS AND THUNDERSTORMS, BUT AGAIN PUTTING THE NORTH COUNTRY IN SOUTHWEST FLOW WITH INCREASING TEMPERATURES. FRIDAY MAXES WILL SEE THE U70S-M80S. A DEEPER UPPER LEVEL TROUGH WILL DIG SOUTHWARD FROM CENTRAL CANADA INTO THE NORTHERN GREAT LAKES REGION PROGRESSING TOWARD THE EASTER GREAT LAKES FRIDAY NIGHT INTO SATURDAY. AT THE SURFACE, A COLD FRONT WILL BRING SHOWERS AND THUNDERSTORMS TO NRN NY EARLY SATURDAY AND SPREAD ACROSS THE REST OF THE NORTH COUNTRY THROUGHOUT THE DAY. ECMWF AND GFS DISAGREE ON PROGRESSION OF THIS FRONT, AS THE GFS IS MORE PROGRESSIVE CLEARING THE FRONT TO OUR SOUTHEAST SATURDAY NIGHT. THE ECMWF KEEPS THE FRONT STALLED ACROSS THE REGION WITH MULTIPLE DAYS OF PRECIPITATION INTO THE WEEKEND. && .AVIATION /20Z SUNDAY THROUGH FRIDAY/... THROUGH 18Z MONDAY...VFR CONDITIONS PERSIST THROUGH TONIGHT. FEW ISOLATED LIGHT RAIN SHOWERS WITH VFR CIGS AND VSBYS THIS AFTERNOON WILL DISSIPATE AROUND SUNSET. MAINLY CLEAR SKIES THIS EVENING INTO THE EARLY NIGHT WILL SEE INCREASING MID AND LOW LEVEL CLOUDS TOWARDS MORNING/AROUND SUNRISE. SCT SHOWERS WILL MOVE WESTWARD INTO NRN NY WITH VCSH POSSIBLE STARTING AROUND 10Z, REACHING THE CHAMPLAIN VALLEY AROUND 12Z. EXPECT MVFR CIGS TO ACCOMPANY THESE SHOWERS AT KMSS AND KSLK AROUND 12Z-13Z, BUT AREAS EAST LOOK TO REMAIN VFR AT LEAST THROUGH 18Z/MONDAY. SOME SHOWERS MAY CONTAIN MVFR VSBYS AND CIGS. WINDS OUT OF THE SW AT 6-12KTS CONTINUE WITH GUSTS AT MOST SITES OF 18-28KTS. OVERNIGHT, WINDS WILL DIMINISH TO 3-8KTS AND PICK UP OUT OF THE SOUTH IN THE MORNING AT 5-10 KTS. OUTLOOK 18Z MONDAY THROUGH FRIDAY... 18Z MONDAY - 12Z TUESDAY...A WEAK WARM FRONT WILL PRODUCE A PERIOD OF LIGHT RAIN SHOWERS WITH MVFR CIGS POSSIBLE. 12Z TUESDAY - 00Z WEDNESDAY...VFR IN BRIEF BREAK FROM SHOWERS AND THUNDERSTORMS. 00Z WEDNESDAY - 00Z FRIDAY...VFR WITH MVFR/IFR IN AFTERNOON SHOWERS AND THUNDERSTORMS, MAINLY DURING THE PEAK HEATING HOURS. 00Z FRIDAY ONWARD...GENERALLY VFR CONDITIONS AS WEAK HIGH PRESSURE BRIEFLY BUILDS INTO THE REGION. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...NONE. NY...NONE. && $$ SYNOPSIS...RJS NEAR TERM...RJS SHORT TERM...RJS LONG TERM...KGM AVIATION...KGM

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