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Area Forecast Discussion
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000
FXUS61 KBTV 231732
AFDBTV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
132 PM EDT WED APR 23 2014

.SYNOPSIS...
LOW PRESSURE WILL CONTINUE TO AFFECT THE NORTH COUNTRY THROUGH
TONIGHT...PRODUCING CLOUDY SKIES AND ISOLATED TO SCATTERED
SHOWERS. THIS WILL BE FOLLOWED BY HIGH PRESSURE BUILDING OVER THE
AREA FOR THURSDAY AND REMAINING INTO FRIDAY MORNING. A LOW
PRESSURE SYSTEM APPROACHES DURING THE DAY FRIDAY AND AFFECTS THE
REGION RIGHT INTO THE UPCOMING WEEKEND.

&&

.NEAR TERM /UNTIL 8 PM THIS EVENING/...
AS OF 127 PM EDT WEDNESDAY...MINOR UPDATE TO REDUCE POPS ACRS THE
CPV/CT RIVER VALLEY AND PARTS OF NORTHERN NY. CRNT RADAR AND
SUMMIT WEB CAMS SHOW VERY LIGHT PRECIP FALLING WITH FREEZING LVL
AROUND 3000 FT. BOTH RAP AND BTV 4KM CONT TO SUPPORT SOME LIGHT
RAIN/SNOW SHOWERS THIS AFTN/EVENING ASSOCIATED WITH FAVORABLE
UPSLOPE FLW. HOWEVER...SFC DWPTS CONT TO DRY WITH READINGS IN THE
20S/30S WHICH WL LIMIT AREAL COVERAGE/INTENSITY OF PRECIP TODAY.
OTHERWISE...TEMPS ARE HOLDING IN THE U30S MTNS TO U40S WARMER VALLEYS.

PREVIOUS DISCUSSION...WITH SFC LOW SHIFTING TO THE NE...UPPER LOW
WILL MOVE ACROSS THE REGION TODAY...SETTING THE AREA UP FOR N/NW
FLOW TODAY. FOCUS OF PRECIP WILL BE OVER HIGHER TRRN DUE TO
UPSLOPE/OROGRAPHIC CONDITIONS...WITH TEMPS IN THE VALLEY WARM
ENOUGH FOR -SHRA. BUT HIGHER TRRN WILL SEE SOME RASN MIX. WINDS
MAY ALSO BECM GUSTY FOR THE LATTER HALF OF THE DAY AS 40-50KT JET
AT 850MB EXTENDS INTO THE SRN 2/3 OF THE FA. EXPECT QPF AMTS
AROUND ONE TO TWO TENTHS OF AN INCH...WITH ABOUT AN INCH OF
SNOWFALL PSBL OVER THE HIGHER TRRN.

PRECIP WILL TAPER OFF FROM WEST TO EAST WITH APPROACH OF SFC HIGH
PRESSURE FROM THE CENTRAL PORTION OF THE COUNTRY LATE TODAY INTO
THIS EVENING. SHOWERS LOOK TO LINGER INTO THE OVERNGT ACROSS THE
NEK.

CLOUDY SKIES FROM LLVL MOISTURE AND UPPER LVL TROUGH TRAVERSING
THE AREA...ALONG WITH COOLER N/NW FLOW WILL KEEP MAX TEMPS IN THE
40S-L50S IN THE VALLEYS AND 30S AT THE SUMMITS TODAY.

&&

.SHORT TERM /8 PM THIS EVENING THROUGH FRIDAY/...
AS OF 420 AM EDT WEDNESDAY...PRECIP CONTINUES TO TAPER OFF THIS
EVENING...LINGERING MOSTLY IN THE NEK IN THE FORM OF RASN MIX AS
TEMPS FALL INTO THE L-M30S IN THE VALLEYS AND 20S IN THE HIGHER
TRRN.

SFC HIGH PRESSURE BUILDS IN FROM THE NW...WITH UPPER LVL RIDGING
COINCIDING WILL LEAD TO 925MB TEMPS INCREASING TO 2C-3C THURSDAY.
GENERALLY CLEARING SKIES BUT CONTINUED N/NW FLOW WILL SEE MAX
TEMPS IN THE U40S-M50S IN THE VALLEYS AND U30S-L40S IN THE HIGHER
TRRN.

RIDGING WILL ALSO PUSH WEDNESDAYS 850MB JET EWD...AT 30-45KTS
OVER SRN AND ERN VT. CLOSER TO THE SFC...925MB WINDS FOR THIS
AREA AROUND 28-35KTS. WITH DRIER AIR FILTERING IN AND GUSTY WINDS
PSBL...FINER FUELS WILL DRY MAINLY ACROSS SRN PORTIONS OF
FA...BUT THIS WILL BE HIGHLY DEPENDENT ON HOW MUCH QPF RESULTS
TODAY AND TONIGHT.

THURSDAY NGT...WINDS SUBSIDE WITH RIDGE CRESTING OVER THE REGION
AND CLEAR SKIES RESULTING IN COLD OVERNIGHT MIN TEMPS...20S-L30S.
WARMTH REBOUNDS ON FRIDAY WITH 925MB TEMPS REACHING 7C-9C IN
SOUTHERLY FLOW. ANOTHER SFC LOW WILL APPROACH FROM THE GREAT LAKES
REGION...BRINGING MORE PRECIP TO THE REGION FOR THE LATTER HALF OF
FRIDAY/FRIDAY NGT. MAX TEMPS WILL SEE U50S-L60S.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
AS OF 455 AM EDT WEDNESDAY...ECMWF AND GFS MODELS SHOW MOISTURE
FROM A WEAK FRONTAL SYSTEM WILL MOVE INTO THE REGION FRIDAY
NIGHT... SO HAVE BOOSTED POPS UP TO LIKELY. ON SATURDAY...ECMWF
AND GFS MODELS SHOWING AN UPPER TROUGH AND CLOSED UPPER LOW WILL
DIG SOUTHEAST FROM CANADA ON SATURDAY. GFS IS MUCH SHARPER WITH
THE UPPER TROUGH THAN THE ECMWF MODEL AND ALSO HAS THE CLOSED
UPPER LOW OVER THE FORECAST AREA ON SATURDAY...WHILE THE ECMWF
HAS THIS FEATURE FURTHER NORTH ACROSS QUEBEC ON SATURDAY. WILL
CONTINUE WITH LIKELY POPS FOR SHOWERS ON SATURDAY. AREA TO REMAIN
UNDER CYCLONIC FLOW ON SUNDAY...SO WILL KEEP IN SLIGHT TO LOW
CHANCE POPS ON SUNDAY FOR SHOWERS. ECMWF AND GFS MODEL SUGGESTING
A MAINLY DRY FORECAST FOR MONDAY AND MONDAY NIGHT...WITH JUST
SLIGHT CHANCE POPS FOR SHOWERS ACROSS NORTHEAST VERMONT ON
MONDAY. ON TUESDAY...GFS AND ECMWF MODELS HAVE DIFFERING
SOLUTIONS...LEADING TO LOW FORECASTER CONFIDENCE FOR TUESDAY. GFS
MODEL HAS THE REGION IN AN OMEGA BLOCK ON TUESDAY WITH A CLOSED
UPPER LOW SOUTH OF NOVA SCOTIA AND ANOTHER CLOSED UPPER LOW OVER
THE MID MISSISSIPPI VALLEY. THIS SOLUTION WOULD MEAN A DRY
FORECAST FOR THE REGION ON TUESDAY. HOWEVER...ECMWF MODEL HAS THE
CLOSED UPPER LOW ON TUESDAY WELL SOUTH OF NEWFOUNDLAND...WITH AN
OPEN TROUGH OF THE MISSISSIPPI VALLEY. THIS SOLUTION WOULD ALLOW
FOR MOISTURE FROM THE SOUTHEASTERN U.S TO MOVE INTO THE REGION ON
TUESDAY WITH SHOWERS LIKELY. GIVEN MODEL DIFFERENCES...FOR NOW
WILL GO WITH SLIGHT CHANCE POPS FOR SHOWERS ON TUESDAY.

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
THROUGH 18Z THURSDAY...BASICALLY A PERSISTENCE FORECAST THROUGH
THE NEXT 12 HOURS AS THE FORECAST AREA REMAINS UNDER THE INFLUENCE
OF A DEPARTING UPPER LOW/TROUGH OVER THE NORTHEAST. THROUGH 12Z
THURSDAY...EXPECTING MAINLY VFR CONDITIONS AT KMSS/KBTV/KPBG WHILE
MVFR WILL REMAIN AT KRUT THROUGH 00Z...AND THROUGH 12Z AT
KSLK/KMPV. RADAR SHOWING LITTLE IN THE WAY OF PRECIP AT THIS
TIME...THOUGH MAY SEE SOME SPOTTY SHOWERS/DRIZZLE OVERNIGHT. HAVE
LEFT OUT OF TAFS FOR NOW DUE TO TIMING AND AREAL COVERAGE
UNCERTAINTY. AFTER 12Z THURSDAY...VFR CONDITIONS ARE EXPECTED
AREA-WIDE WITH SKC-SCT CIGS AS HIGH PRESSURE BUILDS IN. PRESSURE
GRADIENT TIGHTENS BETWEEN THE DEPARTING LOW AND BUILDING HIGH SO
NW WINDS WILL BE QUITE BRISK...GUSTING 20-30KTS.

OUTLOOK 18Z THURSDAY THROUGH MONDAY...

18Z THU THRU 00Z SAT...VFR UNDER HIGH PRESSURE. CONTINUED
GUSTS FROM THE NW 18Z THU THRU 12Z FRI.

00Z SAT THRU 00Z MON...MAINLY VFR WITH CHANCE OF MVFR SHOWERS
ASSOCIATED WITH A WEAK LOW PASSAGE.

MONDAY...MAINLY VFR UNDER SCT-BKN SKIES.

&&

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

&&

$$
SYNOPSIS...KGM/JN
NEAR TERM...TABER
SHORT TERM...KGM
LONG TERM...WGH
AVIATION...LAHIFF








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