Severe Thunderstorm Warning 10, NWS Burlington, VT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
353 PM EDT WED MAY 22 2013

.SYNOPSIS...
FRONTAL BOUNDARY WILL CONTINUE TO LIFT NORTHWARD ACROSS THE
REGION OVERNIGHT. SCATTERED TO ISOLATED THUNDERSTORMS ARE
EXPECTED THROUGH 10PM...SOME STORMS MAY BE SEVERE. A SLOW-MOVING
COLD FRONT WILL THEN APPROACH FROM THE EASTERN GREAT LAKES REGION
BRINGING ADDITIONAL WIDESPREAD RAINFALL AND EMBEDDED
THUNDERSTORMS DURING THURSDAY AND THURSDAY NIGHT. WHILE IT WON/T
BE RAINING CONTINUOUSLY...PERIODS OF BRIEFLY HEAVY RAIN
ASSOCIATED WITH THE SHOWERS AND THUNDERSTORMS WILL GENERALLY
BRING AN ADDITIONAL 1 TO 2 INCHES OF RAIN ACROSS THE NORTH
COUNTRY THROUGH THURSDAY NIGHT. SOME MINOR FLOODING WILL BE
POSSIBLE...MAINLY THURSDAY INTO THURSDAY NIGHT WITH THE MOST
WIDESPREAD RAINFALL.

&&

.NEAR TERM /UNTIL 8 AM THURSDAY MORNING/...
AS OF 350 PM EDT WEDNESDAY...REGION CONTINUES TO BE UNDER SEVERE
THUNDERSTORM WATCH THRU 10PM. LARGE HAIL...DAMAGING WINDS...AND
VERY HEAVY RAIN ARE POSSIBLE IN ANY THUNDERSTORMS. FRONT ACROSS
THE AREA LIFTS NORTHWARD OVERNIGHT AND SHOWERS AND THUNDERSTORMS
END BY ABOUT 11PM. THEN SYNOPTIC FEATURE BRINGS RENEWED CHANCE OF
SHOWERS WITH EMBEDDED THUNDERSTORMS DURING THE OVERNIGHT HOURS
FROM WEST TO EAST ACROSS THE AREA. DEEP-LAYER SWLY FLOW AND WARM
ADVECTION CONTINUES. SEVERE PARAMETERS LOOK LESS FAVORABLE
OVERNIGHT...THEREFORE HAVE DROPPED ENHANCED WORDING. LOWS WILL BE
ON THE WARM SIDE TONIGHT WITH 60S DEWPOINTS IN PLACE ALONG WITH
CLOUDS AND S-SW WINDS ALL NIGHT. LOW TEMPS WILL MAINLY BE IN THE
UPR 50S TO LOWER 60S.

&&

.SHORT TERM /8 AM THURSDAY MORNING THROUGH FRIDAY NIGHT/...
AS OF 350 PM EDT WEDNESDAY...THURSDAY WILL PRODUCE OUR MOST
WIDESPREAD RAINFALL AS COLD FRONT AND ASSOCIATED POSITIVE TILT
500MB TROUGH BEGINS TO SHIFT SLOWLY SEWD ACROSS THE FORECAST
AREA. MOIST AND MARGINALLY UNSTABLE AIR MASS WILL SUPPORT SEVERAL
BANDS OF SLOW MOVING CONVECTION ALONG/IN ADVANCE OF THE COLD
FRONT. GIVEN THE SETUP...MOST OF THE NWP QPF LOOKED ON THE LOW
SIDE GIVEN EVOLUTION AND MOIST AIR MASS IN PLACE. TRENDED CLOSER
TO HIGHER ECMWF QPF WITH WIDESPREAD 1+" RAINFALL AMTS ACROSS THE
CWA. SOME OF THIS HEAVY RAIN CONTINUES INTO THURSDAY
NIGHT...ESPECIALLY CENTRAL AND ERN VT. CAN/T RULE OUT LOCALIZED
2" RAINFALL AMTS BEFORE THINGS LIGHTEN UP EARLY FRIDAY. SOME
MINOR FLOODING IS POSSIBLE...REFER TO HYDRO SECTION BELOW. HIGHS
THURSDAY GENERALLY IN THE MID 70S. EPISODES OF SHOWERS/TSTMS
EXPECTED UNDER CLOUDY SKIES. FRIDAY...LIKELY POPS FOR RAIN
SHOWERS IN THE MORNING...THEN SLOW/GRADUAL DRYING FROM NW-SE
ACROSS THE REGION. SHOULD SEE SOME PARTIAL SUNSHINE LATE IN THE
DAY FROM THE CHAMPLAIN VALLEY WWD. COOLER TEMPS WITH HIGHS IN THE
LOW-MID 60S.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
AS OF 255 PM EDT WEDNESDAY...STILL NOT A VERY CLEAR CUT FORECAST
FOR THE HOLIDAY WEEKEND, BUT IT'S LOOKING INCREASINGLY LIKELY
THAT SATURDAY WILL FEATURE SOME RAIN -- AND PERHAPS EVEN INTO
SUNDAY FOR PARTS OF THE AREA THANKS TO A SLOW MOVING UPPER TROUGH
AND ASSOCIATED SURFACE LOW PRESSURE. MEMORIAL DAY AND AFTER DOES
LOOK DRY WITH WARMING TEMPERATURES. DAILY SPECIFICS BELOW:

SATURDAY: DECENT AMOUNT OF VARIABILITY IN THE MODELS. NAM PUSHES
THE TROUGH AND LOW PRESSURE OUT THE QUICKEST AND WOULD FEATURE A
PRETTY DRY DAY, WHILE 12Z GFS AND 00Z EURO ARE PRETTY SIMILAR
FEATURING A "BATTEN DOWN THE HATCHES" WET DAY AS THEY HOLD BACK
THE TROF AND LOW THE LONGEST. THIS SOLUTION WOULD FEATURE A SLUG
OF HEAVY RAIN, PROBABLY ACROSS VERMONT -- AND THIS COULD RESULT
IN FLOODING ISSUES. 00Z GFS ENSEMBLES ARE A BIT QUICKER, BUT
STILL FEATURE PRECIPITATION FOR THE DAY. GIVEN A BIG OMEGA BLOCK
EXPECTED TO FORM OVER THE ATLANTIC, THAT MEANS EVERYTHING WILL
SLOW DOWN. THUS FEEL THE FAST NAM NEEDS TO BE DISCARDED, BUT THE
GFS/EURO COMBO MIGHT BE A LITTLE SLOW. AT THE END OF MY THOUGHT
PROCESS THOUGH, FELT IT NECESSARY TO INCREASE POPS -- WITH THE
BEST CHANCE ACROSS VERMONT WHERE IT WILL BE CLOSER TO THE LOW OFF
THE COAST. ST LAWRENCE VALLEY SHOULD REMAIN DRY AND A LITTLE BIT
OF LIGHT RAIN COULD COME BACK TO THE 'DACKS. WITH ALL THE CLOUDS
AND COLD AIR WITH THE ASSOCIATED TROUGH, TEMPERATURES WILL BE
WELL BELOW NORMAL, 50S IN THE VALLEYS AND 40S IN THE HIGHER
TERRAIN. GONNA BE A DAMP/DREARY DAY. ADDING TO THE MISERY WILL BE
SOME BREEZY CONDITIONS. NORTH/NORTHWEST WINDS SHOULD GUST UPWARDS
OF 25 MPH. COME SATURDAY NIGHT, COLDER AIR ALOFT COULD RESULT IN
A LITTLE BIT OF SNOW AT ELEVATIONS PRIMARILY ABOVE 2500FT.

SUNDAY: WILL BE A TRANSITION DAY. LOW PRESSURE WILL BE MOVING
TOWARD THE CANADIAN MARITIMES, BUT ENOUGH MOISTURE ROTATING BACK
SO THAT I EXPECT CLOUDS AND LIGHT PRECIPITATION TO CONTINUE,
ESPECIALLY ACROSS EASTERN SECTIONS. HAVE PLACED LOW CHANCE POPS
BACK TO THE CHAMPLAIN VALLEY WITH HIGHER IN EASTERN VERMONT. NEW
YORK SHOULD REMAIN DRY. BY LATE IN THE DAY, CLOUDS SHOULD BE
BREAKING UP FROM WEST TO EAST. WILL BE CHILLY AND CONTINUED
BREEZY. 850MB TEMPERATURES ALOFT WILL BE ON EITHER SIDE OF 0C.
EVEN IN PERFECTLY SUNNY/DRY CONDITIONS, THIS WOULD ONLY SUPPORT
VALLEY HIGHS ABOUT 60F. WITH CLOUDS AND CONTINUED NORTHERLY FLOW,
I SUSPECT LOW 50S WILL BE IT FOR LOWER ELEVATIONS AND 40S IN THE
HIGHER TERRAIN. AGAIN SUNDAY MORNING AT THE HIGHEST SUMMITS, I'M
EXPECTING A LITTLE BIT OF SNOW. MAYBE ACCUMULATING TO 1" OR SO ON
MANSFIELD BY MID-DAY.

MEMORIAL DAY: GETTING BETTER AND WILL BE THE BEST DAY FOR ALL
OUTDOOR ACTIVITIES. PERHAPS RESIDUAL CLOUDS EARLY ACROSS THE
EAST, BUT OTHERWISE MOSTLY SUNNY. STILL COOL ALOFT, BUT 850MB
TEMPERATURES UP TO ABOUT 4C, SUPPORTING SURFACE HIGHS ABOUT 10F
WARMER THAN SUNDAY. LOTS OF LOW-MID 60S AT LOWER ELEVATIONS AND
UPPER 50S AT HIGHER ELEVATIONS.

DO NEED TO NOTE THAT THE 12Z EURO IS JUST COMING IN, AND IT
SUGGESTS AN EVEN SLOWER MOVE OUT OF THE TROUGH AND UPPER LOW. IN
FACT, IF THAT MODEL FORECAST ENDS UP PERFECT, THEN EVEN MONDAY
WILL BE CLOUDY/COOL/SOME RAIN -- VERY MUCH LIKE SUNDAY.

TUESDAY/WEDNESDAY: RIDGING SLOWLY BUILDS IN, ALONG WITH WARMER
TEMPERATURES ALOFT. EACH DAY SHOULD FEATURE TEMPERATURES ABOUT 5
TO 7 WARMER THAN THE PREVIOUS ONE -- SO SHOULD BE SOME NICE DAYS
(AGAIN ASSUMING THINGS DONT COME TO A COMPLETE STANDSTILL AND
KEEP US SMACK IN THE MIDDLE OF THE TROUGH).

&&

.AVIATION /20Z WEDNESDAY THROUGH MONDAY/...
THROUGH 18Z THURSDAY...SHOWERS AND THUNDERSTORMS ACROSS THE
REGION WILL GENERALLY MOVE WEST TO EAST. VFR CONDITIONS WILL
DETERIORATE TO MVFR WITHIN SHOWERS AND LIFR/IFR IN AND AROUND
THUNDERSTORMS THIS AFTERNOON THROUGH THE EVENING HOURS. SOME
THUNDERSTORMS WILL CONTAIN SMALL HAIL AND DANGEROUS WIND GUSTS IN
EXCESS OF 50 KTS. KSLK ALREADY EXPERIENCING SOME TS...WITH KRUT
SEEING MVFR CIGS IN RAIN SHOWERS. KPBG/KBTV AND KMPV WILL LIKELY
SEE CONVECTION WITHIN THE NEXT 2 HRS AND CONTINUE THROUGH THE
EVENING. KMSS JUST NORTH OF BEST INSTABILITY...BUT WILL ALSO
LIKELY SEE SOME CONVECTION.

AFTER THE STORMS AND SHOWERS TAPER OFF...MAINLY AFTER
06Z...MOISTURE WHERE IS HAS RAINED WILL CONTINUE MVFR CIGS...BUT
WINDS WILL BEGIN TO PICK UP OUT OF THE S-SW WITH GRADUALLY
IMPROVING CONDITIONS TOWARDS MID MORNING.

OUTLOOK 18Z THURSDAY THROUGH MONDAY... UNSETTLED WX WITH
OCCASIONAL SHOWERS/STORMS WL CONT FOR THURSDAY INTO FRIDAY ACRS
OUR TAF SITES. THE STRONGER SHOWERS/STORMS ON THURS AFTN/EVENING
ASSOCIATED WITH A SFC COLD FRNT WL PRODUCE MVFR CONDITIONS...WITH
BRIEF PERIODS OF IFR LIKELY. ALSO...ANY STORMS WL HAVE THE
POTENTIAL TO PRODUCE GUSTY SFC WINDS UP TO 40 MPH. AREAS OF FOG
AND LOW CLOUDS WL BE POSSIBLE ON THURSDAY NIGHT...WITH SOME
LOCALIZED IFR/LIFR LIKELY. SCATTERED SHOWERS MAY LINGER INTO
SATURDAY/SUNDAY WITH MVFR...BEFORE HIGH PRES SLOWLY BUILDS INTO
THE REGION BY EARLY NEXT WK. GUSTY NORTHWEST WINDS WL BE POSSIBLE
OVER THE WEEKEND...WITH AREAS OF LLVL TURBULENCE.

&&

.HYDROLOGY...
350 PM WEDNESDAY...WIDESPREAD 1.0" TO 1.5" RAINFALL (WITH LOCALLY
HIGHER AMTS) HAS OCCURRED ACROSS THE NORTH COUNTRY DURING THE
PAST 24-30 HOURS ASSOCIATED WITH SEVERAL EPISODES OF HEAVY
SHOWERS AND TSTMS. AN ADDITIONAL 1-2" RAINFALL IS FORECAST
BETWEEN LATE AFTN/EVENING SHOWERS AND TSTMS AND THE MORE
WIDESPREAD RAIN AND EMBEDDED TSTMS ON THURSDAY. WHILE ANTECEDENT
SOIL CONDITIONS HAVE BEEN DRY...AND VEGETATION IS FULLY
ACTIVE...THE ADDITIONAL RAINFALL WILL EVENTUALLY BRING THE
POTENTIAL FOR STREET/POOR DRAINAGE FLOODING. ASSOCIATED MINOR
FLOODING WOULD MOST LIKELY OCCUR DURING THE DAY THURSDAY AND INTO
THURSDAY NIGHT. MAIN-STEM RIVER FLOODING IS NOT FORECAST...BUT
MAY NEED TO WATCH SOME OF THE SMALLER RIVERS AND STREAMS THAT
COULD LOCALLY EXCEED BANKFUL LATER THURSDAY AND THURSDAY NIGHT.

&&

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

&&

SYNOPSIS...BANACOS/NEILES
NEAR TERM...NEILES
SHORT TERM...BANACOS/NEILES
LONG TERM...NASH
AVIATION...KGM/TABER
HYDROLOGY...

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
457 PM EDT WED MAY 22 2013

NYZ026>031-034-035-087-VTZ001>012-016>019-222300-
NORTHERN ST. LAWRENCE-NORTHERN FRANKLIN-EASTERN CLINTON-
SOUTHEASTERN ST. LAWRENCE-SOUTHERN FRANKLIN-WESTERN CLINTON-
WESTERN ESSEX-EASTERN ESSEX-SOUTHWESTERN ST. LAWRENCE-GRAND ISLE-
WESTERN FRANKLIN-ORLEANS-ESSEX-WESTERN CHITTENDEN-LAMOILLE-
CALEDONIA-WASHINGTON-WESTERN ADDISON-ORANGE-WESTERN RUTLAND-
WINDSOR-EASTERN FRANKLIN-EASTERN CHITTENDEN-EASTERN ADDISON-
EASTERN RUTLAND-
INCLUDING THE CITIES OF...MASSENA...MALONE...PLATTSBURGH...
STAR LAKE...SARANAC LAKE...TUPPER LAKE...DANNEMORA...
LAKE PLACID...PORT HENRY...TICONDEROGA...OGDENSBURG...POTSDAM...
GOUVERNEUR...ALBURGH...SOUTH HERO...ST. ALBANS...NEWPORT...
ISLAND POND...BURLINGTON...JOHNSON...STOWE...ST. JOHNSBURY...
MONTPELIER...MIDDLEBURY...VERGENNES...BRADFORD...RANDOLPH...
RUTLAND...SPRINGFIELD...WHITE RIVER JUNCTION...ENOSBURG FALLS...
RICHFORD...UNDERHILL...BRISTOL...RIPTON...EAST WALLINGFORD...
KILLINGTON
457 PM EDT WED MAY 22 2013

...STRONG THUNDERSTORM POTENTIAL CONTINUES OVER THE AREA...

THUNDERSTORMS WILL CONTINUE TO DEVELOP AND MOVE ACROSS THE NORTH
COUNTRY THROUGH 700 PM. THESE STORMS MAY PRODUCE VERY HEAVY
DOWNPOURS...WIND GUSTS UP TO 45 MPH AND SMALL HAIL.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM WEDNESDAY
EVENING FOR NORTHERN NEW YORK AND VERMONT.

JN

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