National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KBTV 082317
AFDBTV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
617 PM EST SUN DEC 8 2013

.SYNOPSIS...
HIGH PRESSURE EXITS NORTHEASTWARD INTO THE CANADIAN MARITIMES
TONIGHT. THIS WILL ALLOW A WARM FRONT AND WEAK WAVE OF LOW PRESSURE
TO MOVE FROM THE OHIO VALLEY NORTHEASTWARD INTO THE NORTH COUNTRY
MONDAY MORNING. THIS SYSTEM WILL BRING MAINLY LIGHT SNOW TO THE
REGION ON MONDAY...BUT SOME LOCALLY HIGHER SNOW AMOUNTS RANGING FROM
3 TO 5 INCHES ARE POSSIBLE ALONG THE EASTERN SLOPES OF THE GREEN
MOUNTAINS. A COLD FRONT FOLLOWS QUICKLY MONDAY NIGHT WITH CONDITIONS
TURNING COLDER AND DRIER FOR THE REMAINDER OF THE WORK WEEK. A FEW
SNOW FLURRIES OR SNOW SHOWERS WILL BE POSSIBLE...WITH HIGH
TEMPERATURES IN THE 20S ON WEDNESDAY AND MAINLY IN THE TEENS TO
LOWER 20S FOR THURSDAY AND FRIDAY.

&&

.NEAR TERM /THROUGH MONDAY/...
-- Changed Discussion --
AS OF 616 PM EST SUNDAY...WINTER WEATHER ADVISORIES TAKE EFFECT AT
MIDNIGHT FOR CENTRAL AND EASTERN VERMONT AND ESSEX COUNTY NEW
YORK. CURRENT FORECAST REMAINS IN GOOD SHAPE AS SFC ANTICYCLONE
CONTINUES TO FUNNEL IN DRIER AIR INTO THE NORTH COUNTRY. EXPECT
LOW-LEVELS TO CONTINUE TO SATURATE AS THE EVENING PROGRESSES AS
THE LEADING EDGE OF BROADER SYNOPTIC-SCALE ASCENT NOW OVER THE
SOUTHERN HUDSON VALLEY MAKES IT WAY NORTHWARD LATE THIS EVENING
INTO THE OVERNIGHT PERIOD. I`VE UPDATED THE GRIDS WITH THE CURRENT
OBSERVATIONS WITH THIS UPDATE WITH NO OTHER CHANGES NEEDED.

PREVIOUS NEAR-TERM DISCUSSION ISSUED AT 351 PM EST FOLLOWS...

WINTER WEATHER ADVISORIES HAVE BEEN POSTED FOR RUTLAND/WINDSOR
COUNTIES NWD ACROSS ALL OF CENTRAL/ERN VT. A WINTER WX ADVISORY
HAS ALSO BEEN POSTED FOR ESSEX COUNTY NY. THESE AREAS WILL SEE
3-5" OF SNOWFALL...AIDED BY SELY UPSLOPE CONDITIONS ON THE EAST
SIDE OF THE GREENS MOUNTAINS. 1-3" GENERALLY EXPECTED IN THE ST.
LAWRENCE VALLEY...CHAMPLAIN VALLEY...WRN SLOPES OF THE
GREENS...AND CT VALLEY. TIME FRAME FOR ADVISORY IS MIDNIGHT
TONIGHT THROUGH 4PM MONDAY WITH TRAVEL IMPACTS DURING THE DAYLIGHT
HRS MONDAY.

CLOUDS WILL THICKEN AND LOWER ACROSS THE NORTH COUNTRY FROM SW-NE
OVERNIGHT IN ASSOCIATION WITH INCREASING DEEP-LAYER WAA. BOUNDARY
LAYER IS INITIALLY QUITE DRY (DEWPOINTS IN THE SINGLE DIGITS TO
AROUND 10F)...BUT SUFFICIENT MOISTENING TAKES PLACE WITH STRONGER
850-700MB WAA TO ALLOW LIGHT SNOW TO OVERSPREAD RUTLAND/WINDSOR
COUNTIES 05-07Z AND THEN ACROSS THE REMAINDER OF THE FORECAST AREA
07-11Z. IT SHOULD BE SNOWING IN MOST LOCATIONS FOR THE MORNING
COMMUTE WITH SOME IMPACTS TO TRAVEL...ESPECIALLY CENTRAL/S-CENTRAL
VT. BY 12Z MONDAY...SNOW AMOUNTS WILL RANGE FROM A DUSTING TO 1"
ACROSS THE NORTHERN HALF OF THE FORECAST AREA...AND 1-2" FOR SRN
SECTIONS. DEVELOPING LOW-LEVEL SELY FLOW SFC-925MB LAYER WILL BRING
UPSLOPE CONDITIONS ALONG THE ERN SLOPES OF THE GREEN
MOUNTAINS...AIDING IN SNOWFALL RATES FROM LUDLOW NORTH TO
MONTPELIER. THIS IS WHERE THE HIGHER SNOWFALL AMTS ARE EXPECTED. ON
THE DOWNSLOPE SIDE...LIGHTER SNOWFALL FROM WRN RUTLAND CO NORTH INTO
THE CHAMPLAIN VALLEY. SE WINDS OF 15-25 MPH WITH A FEW GUSTS 35 MPH
ARE EXPECTED ALONG THE IMMEDIATE WRN SLOPES OF THE GREEN MOUNTAINS
09-15Z WITH DOWNSLOPE AND STRONG P-GRADIENT IN PLACE. LOWS TONIGHT
MAINLY LOW-MID 20S...STEADY OR SLOWLY RISING LATE.

BEST WARM ADVECTION/ISENTROPIC LIFT MOVES PAST THE REGION BY
18Z MONDAY...WITH JUST SOME LINGERING LIGHT MIXED PCPN DURING THE
MID AFTN HOURS. THERMAL PROFILES WARM ENOUGH TO SUPPORT SOME MIX
WITH SLEET FOR THE LAST FEW HOURS ACROSS MAINLY RUTLAND/WINDSOR
COUNTIES. TOTAL SNOWFALL AMTS 3-5" ALONG THE ERN SLOPES OF THE
GREENS...WRN ESSEX COUNTY NY...WITH 1-3" GENERALLY ELSEWHERE (AROUND
1.5-2" IN THE BTV AREA). NOT A MAJOR EVENT...BUT SOME
SLIPPERY/SNOWCOVERED ROADS CAN BE EXPECTED WITH EXTRA TIME NEEDED
FOR TRAVEL...ESPECIALLY ERN SLOPES OF GREENS WITH HIGHEST TOTALS AND
HEAVIEST SNOWFALL RATES. HIGH TEMPS MONDAY WILL RANGE FROM AROUND
32F EAST OF THE GREEN MTNS AND IN THE ADIRONDACKS...TO THE MID 30S
ELSEWHERE.
-- End Changed Discussion --

&&

.SHORT TERM /MONDAY NIGHT THROUGH TUESDAY NIGHT/...
AS OF 351 PM EST SUNDAY...BROAD WEST TO SWLY FLOW IN PLACE AS WAVE OF
LOW PRESSURE LIFTS WELL TO OUR NORTHEAST ACROSS QUEBEC AND NEW
BRUNSWICK MONDAY NIGHT. NOT EXPECTING MUCH PRECIPITATION THROUGH
THE PERIOD...BUT FLOW FROM THE GREAT LAKES WILL BRING ABUNDANT LOW
CLOUDS WITH SCATTERED FLURRIES AND PERHAPS SOME LAKE EFFECT SNOW
SHOWERS FOR SRN ST. LAWRENCE AND SRN FRANKLIN COUNTIES IN NEW
YORK. MAIN LAKE EFFECT SNOW BANDS WILL REMAIN SOUTH AND WEST OF
THE AREA. LOWS MONDAY NIGHT MAINLY IN THE LOW-MID 20S. HIGHS
TUESDAY UPR 20S TO LOWER 30S. SURFACE AND 700MB TROUGH CROSS THE
REGION TUESDAY NIGHT WITH SOME ADDITIONAL SCATTERED SNOW SHOWERS
POSSIBLE (ACCUMULATION DUSTING-2" POSSIBLE). THIS WILL USHER IN
SOME COLDER AIR WITH LOWS TUESDAY NIGHT MAINLY IN THE TEENS.

&&

.LONG TERM /WEDNESDAY THROUGH SUNDAY/...
AS OF 317 PM EST SUNDAY...RIDGE OF SURFACE HIGH PRESSURE WILL
BUILD INTO THE NORTH COUNTRY FROM WEDNESDAY THROUGH THURSDAY. A
WEAK LOW PRESSURE CLIPPER SYSTEM WILL PASS TO OUR NORTH THURSDAY
NIGHT INTO FRIDAY. ANOTHER SURFACE HIGH RIDGES INTO THE AREA FOR
THE WEEKEND. FAVORABLE FLOW PATTERN FOR LAKE EFFECT SNOW SHOWERS
WILL PERSIST FROM WEDNESDAY THROUGH FRIDAY NIGHT...THEREFORE HAVE
MENTIONED CHANCE FOR SNOW SHOWERS DURING THAT TIME PERIOD IN THE
SOUTHERN SAINT LAWRENCE VALLEY AND NORTHERN ADIRONDACKS. NOT A
STRONG LOW...NOR ABUNDANT MOISTURE...FOR CLIPPER SYSTEM THEREFORE
HAVE SOME MENTION OF CHANCE FOR SNOW SHOWERS ACROSS OUR NORTHERN
ZONES AT THE END OF THE WEEK. TEMPERATURES WILL CONTINUE TO BE
BELOW NORMAL THROUGH THE PERIOD.

&&

.AVIATION /23Z SUNDAY THROUGH FRIDAY/...
THROUGH 18Z MONDAY...A SURFACE RIDGE OF HIGH PRESSURE OVER THE
REGION WILL MOVE SLOWLY EAST AND BE CENTERED OVER THE CANADIAN
MARITIMES BY 12Z. EXPECTING VFR CONDITIONS THROUGH 06Z...WITH
CEILINGS 4000-6000 FEET AND OCCASIONALLY HIGHER. ONLY EXCEPTION
WILL BE SLK WHERE OCCASIONAL SNOW SHOWERS WILL CONTINUE WITH MVFR
CONDITIONS. AFTER 06Z VFR CONDITIONS LOWERING TO IFR IN
DEVELOPING LIGHT SNOW. SURFACE WINDS WILL BE LESS THAN 10 KNOTS
THROUGH 06Z BUT THEN INCREASING TO AROUND 10 KNOTS. SNOW WILL BE
PREVAILING AND LOWER CONDITIONS TO MVFR AT ALL SITES BY 12Z. SOME
IFR IS ALSO POSSIBLE...BUT WILL BE BETTER TIMED AS GET CLOSER TO
MONDAY MORNING.

OUTLOOK 18Z MONDAY THROUGH FRIDAY...

18Z MONDAY THROUGH 12Z TUESDAY...IFR/MVFR IN LIGHT SNOW AND MIXED
PRECIPITATION...AS SURFACE LOW PRESSURE MOVES NORTHEAST FROM THE
MID ATLANTIC COAST TO THE CANADIAN MARITIMES BY 12Z TUESDAY.

12Z TUESDAY THROUGH FRIDAY...GENERALLY VFR WITH SOME AREAS OF
MVFR WITH ISOLATED TO SCATTERED SNOW SHOWERS.

&&

.BTV WATCHES/WARNINGS/ADVISORIES...
VT...WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 4 PM EST
     MONDAY FOR VTZ003-004-006>008-010>012-018-019.
NY...WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 4 PM EST
     MONDAY FOR NYZ034.

&&

$$
SYNOPSIS...BANACOS
NEAR TERM...BANACOS/LOCONTO
SHORT TERM...BANACOS
LONG TERM...NEILES
AVIATION...NEILES