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Area Forecast Discussion
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000
FXUS61 KBGM 231733
AFDBGM

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BINGHAMTON NY
133 PM EDT WED APR 23 2014

.SYNOPSIS...
LIGHT RAIN SHOWERS WILL SLOWLY DIMINISH TODAY AS COLD AND DRY AIR
MOVES INTO THE REGION. WINDS WILL BE QUITE GUSTY ACROSS CENTRAL
NEW YORK AND NORTHEAST PENNSYLVANIA THROUGH THURSDAY AFTERNOON AS
THE PRESSURE WILL BE TIGHT OVER THE REGION. HIGH PRESSURE WILL
THEN TAKE CONTROL OF THE REGION THURSDAY NIGHT WHICH WILL RESULT
IN THE WINDS TO BECOME LIGHT AGAIN. THE NEXT CHANCE FOR RAIN WILL
BE FRIDAY NIGHT WHEN THE NEXT STORM SYSTEM APPROACHES.

&&

.NEAR TERM /THROUGH TONIGHT/...
1100 AM EDT UPDATE... 
THE UPPR LVL SHORT WAVE HAS NOW MOVED TO THE EAST OF THE CWA AND
NW FLOW ALOFT WILL CONTINUE ACROSS THE AREA THROUGH TOMORROW
AFTERNOON. A SECONDARY PUSH OF COLDER AND DRIER AIR HAS STARTED TO
MOVE INTO THE REGION THIS MORNING... AND AS A RESULT THE LINGERING
RAIN SHOWERS ARE SLOWLY DIMINISHING ACROSS THE CWA. EXPECT THE DRY
AIR TO CONTINUE TO ADVECT INTO THE REGION THROUGH THE PERIOD.

AT THE SFC... THE UPPR LVL ATTENDANT SFC LOW IS CURRENTLY LOCATED
OVER MAINE AND A SFC HIGH PRESSURE IS LOCATED OVER THE GREAT LAKES
REGION. THE SFC LOW WILL BE VERY SLOW TO MOVE OFF TO THE EAST AND
A SFC HIGH PRESSURE WILL TRY TO BUILD IN FROM THE WEST TODAY. THIS
COMBINATION WILL RESULT IN THE MSLP TIGHTENING OVER THE REGION
WHICH WILL CREATE GUSTY WINDS. THE WINDS WILL CONTINUE TO BLOW
THROUGH THE NIGHT. DEW POINTS WILL SLOWLY DECREASE THROUGHOUT THE
DAY AND FALL INTO THE LOW TO MID 20S BY LATE TONIGHT. CRITICAL FIRE
WEATHER CONDITIONS ARE NOT EXPECTED TODAY EVEN THOUGH WE WILL HAVE
GUSTY WINDS BECAUSE IT WILL TAKE A WHILE FOR THE TRUE DRY AIR TO
MOVE IN. 

TONIGHT... WINDS ARE EXPECTED TO STILL BE BREEZY AS THE MSLP WILL
STILL KEEP TIGHT AND DUE TO CAA THE 850MB TEMPS WILL FALL TO NEAR -6
C. THE DRY AIR WILL RESULT IN SKIES BECOMING CLEAR ACROSS CENTRAL
NY AND NORTHEAST PA BY EARLY EVENING. THE MENTIONED ABOVE COMBINATION
WILL ALLOW TEMPS TO BECOME QUITE CHILLY FALLING INTO THE LOW 30S
TO MID 20S.

&&

.SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/...
415 AM EDT UPDATE... 
MAIN CONCERN IS FOR GUSTY WINDS AND VERY LOW HUMIDITY LEVELS
THURSDAY AFTERNOON. SEE FIRE WEATHER SECTION OF THE AFD /NEAR
BOTTOM/ FOR FURTHER DETAILS SPECIFIC TO FIRE WEATHER...INCLUDING
THE FIRE WEATHER WATCH ISSUED FOR PORTIONS OF THE POCONOS-WESTERN
CATSKILLS.

THOUGH HIGH PRESSURE WILL BE BUILDING IN THURSDAY...A TIGHT
PRESSURE GRADIENT WILL STILL EXIST BETWEEN THE SURFACE RIDGE OVER
THE ONTARIO PENINSULA-WESTERN NY/PA...AND THE DEEPENING LOW
OFFSHORE OF NOVA SCOTIA. SUBSIDENCE INVERSION DUE TO BUILDING HIGH
WILL BE GETTING ESTABLISHED...RESULTING SUNSHINE AND VERY DRY AIR
MIXING DOWN WITH THE GUSTY WINDS OF PRESSURE GRADIENT. 

MODEL GUIDANCE IS ALREADY QUITE LOW WITH DEW POINTS...YET IN THIS
KIND OF SITUATION MODELS TYPICALLY STRUGGLE WITH MIXING DOWN
ENOUGH OF THE DRY AIR. THUS I WENT EVEN LOWER THAN
GUIDANCE...REACHING INTO THE LOW TO MID TEENS DEW POINTS FOR
MAJORITY OF AREA /UPPER TEENS TOWARDS FINGER LAKES REGION/. WITH
HIGH TEMPERATURES GENERALLY IN THE 50S TO NEAR 60...THIS YIELDS
RELATIVE HUMIDITY BOTTOMING OUT INTO THE MID TEENS TO MID 20S
PERCENT RANGE. DEFINITELY A STATIC ELECTRICITY KIND OF DAY IF
WALKING ON CARPET.

AS FOR THE NORTHWEST WINDS...THEY WILL BE HIGHEST TOWARDS THE
WESTERN CATSKILLS AND POCONOS...WITH SUSTAINED REACHING 20-25 MPH AND
GUSTS TO 35 MPH. EVEN FURTHER WEST...FREQUENT GUSTS 20-30 MPH CAN
BE EXPECTED THURSDAY AFTERNOON.

WINDS WILL DECOUPLE QUICKLY THURSDAY EVENING AS SURFACE RIDGE
MOVES IN. THE INITIALLY CLEAR SKY WILL HELP QUICKLY DROP
TEMPERATURES TO LOWS OF UPPER 20S TO MID 30S. HIGH THIN CLOUDS
WILL START SPREADING IN OVERNIGHT WELL AHEAD OF NEXT FRONT...BUT
NOT BEFORE A GOOD PERIOD OF RADIATIONAL COOLING.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
415 EDT AM UPDATE... 
MODEL CONSENSUS CONTINUES TO SLOW ARRIVAL OF OCCLUDED FRONT
FRIDAY...CONNECTED WELL UPSTREAM TO A SURFACE LOW IN THE NORTHERN
GREAT LAKES 12Z FRI. BAND OF SHOWERS WILL SWEEP WEST TO EAST
MAINLY IN THE AFTERNOON HOURS WITH LITTLE CONSEQUENCE. NO
INSTABILITY ALOFT...THUS NO THUNDER POTENTIAL...AND RAIN AMOUNTS
ON THE LIGHT SIDE...PERHAPS ONLY A TENTH OF AN INCH OR SO.

MAIN SURFACE LOW WILL TRAVERSE ACROSS EASTERN GREAT LAKES
SATURDAY...PUSHED BY A WAVE ROUNDING THE BROAD UPPER TROUGH. THIS
SHOULD YIELD SOME SHOWERS...AND I SIDED WITH WPC GUIDANCE FOR
POPS IN CHANCE TO LIKELY RANGE...HIGHEST NORTH. SECONDARY FRONT 
WITH A BETTER PUSH OF COLD AIR ADVECTION SHOULD PUSH TEMPERATURES
TO BELOW CLIMATOLOGY SATURDAY NIGHT INTO SUNDAY. 

MODELS EXHIBIT UNCERTAINTY ON WHAT TO DO WITH THE BROAD UPPER
TROUGH EARLY NEXT WEEK...WITH ECMWF ORIENTING A VERY NEGATIVELY
TILTED AXIS MAINLY OVER NORTHERN NEW ENGLAND...VERSUS THE GFS WITH
A LARGE STACKED CUTOFF LOW ENCOMPASSING MORE OF THE NORTHEAST. THE
ECMWF SOLUTION WOULD ALLOW MORE MODERATION IN TEMPERATURES YET
ALSO POTENTIAL RAIN FROM BAROCLINIC ZONE. GFS ONLY SLIGHT GRADUAL
MODERATION IN TEMPERATURES YET ALSO MAINLY DRY AS WE GET INTO
UPPER RIDGING BETWEEN THE NORTHEAST CUTOFF LOW...AND ANOTHER LARGE
ONE IN THE MIDWEST. GIVEN THE UNCERTAINTY...I WENT LOWER THAN WPC
GUIDANCE BY ONLY INTRODUCING SLIGHT TO LOW CHANCE POPS AT THIS
TIME...ALONG WITH GRADUAL MODERATION IN TEMPERATURES.

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
18Z WED UPDATE... AT LEAST OCNL IFR CIGS CAN BE EXPECTED TO
CONTINUE THIS AFTN AT KITH/KBGM...WITH MVFR RESTRICTIONS
ELSEWHERE. 

THIS EVE (02-04Z)...DRIER AIR WILL FINALLY WORK ITS WAY INTO THE
RGN FROM THE W...WITH CLEARING SKIES...AND A RETURN TO VFR RGN-
WIDE. 

GUSTY NW WINDS WILL DIMINISH A BIT LTR THIS EVE (02-04Z)...BEFORE
PICKING UP...AND BCMG GUSTY AGN THU MRNG (AFTER 12-13Z).

OUTLOOK...

THU INTO FRI...VFR.

LTR FRI INTO SAT...RESTRICTIONS PSBL IN -SHRA.

LTR SAT THROUGH MUCH OF MON...VFR.

&&

.FIRE WEATHER...
415 AM EDT UPDATE...
HEADS UP...CRITICAL CONDITIONS TO BE APPROACHED OR EVEN 
EXCEEDED THURSDAY...ESPECIALLY IN PORTIONS OF THE POCONOS TO
WESTERN CATSKILLS. FIRST...IT WILL BE COOLER TODAY WITH SCATTERED
SHOWERS. WHILE GUSTY WINDS ARE EXPECTED...MINIMUM RELATIVE
HUMIDITY WILL BE IN THE UPPER 30S TO 40S PERCENT RANGE.
HOWEVER...A VERY DRY AIR MASS MOVING IN THURSDAY WILL ALLOW HUMIDITY
LEVELS TO PLUMMET INTO THE MID TEENS TO LOW 20S PERCENT RANGE BY
THURSDAY AFTERNOON WITH CONTINUED GUSTY NORTHWEST WINDS. SOME
AREAS GOT LOCALIZED WETTING RAINS FROM OUR MOST RECENT SYSTEM THAT
JUST CAME THROUGH TUESDAY...BUT MOST ONLY RECEIVED VERY LIGHT
AMOUNTS. ALSO...SHOWERS TODAY WILL BE SPOTTY...SO FUELS MAY BE
QUITE VULNERABLE TO QUICKLY DRYING OUT THURSDAY GIVEN THE FORECAST
WEATHER CONDITIONS. A FIRE WEATHER WATCH HAS BEEN ISSUED FOR
PORTIONS OF THE POCONOS IN NORTHEAST PA...AND THE WESTERN
CATSKILLS IN NY...WHERE CRITICAL FIRE WEATHER CONDITIONS SHOULD BE 
BREACHED. OUTSIDE OF THE WATCH AREA...RELATIVE HUMIDITY VALUES
WILL EASILY GET INTO CRITICAL LEVELS BUT WINDS WILL BE MORE
BORDERLINE SO CONFIDENCE IS NOT HIGH ENOUGH YET FOR WATCH. MONITOR
FORECAST FOR UPDATES INCLUDING POSSIBLE WATCH EXPANSIONS OR
WARNING ISSUANCES.

&&

.BGM WATCHES/WARNINGS/ADVISORIES...
PA...FIRE WEATHER WATCH FROM THURSDAY MORNING THROUGH THURSDAY 
     EVENING FOR PAZ040-044-047-048-072.
NY...FIRE WEATHER WATCH FROM THURSDAY MORNING THROUGH THURSDAY 
     EVENING FOR NYZ057-062.

&&

$$
SYNOPSIS...TAC
NEAR TERM...KAH/TAC
SHORT TERM...MDP
LONG TERM...MDP
AVIATION...MLJ
FIRE WEATHER...






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