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Area Forecast Discussion
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000
FXUS61 KBGM 221738
AFDBGM

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BINGHAMTON NY
138 PM EDT TUE APR 22 2014

.SYNOPSIS...
RAIN SHOWERS WILL BE LIKELY THIS AFTERNOON AND EVENING AS A COLD
FRONT MOVES EAST ACROSS NEW YORK AND NORTHEAST PENNSYLVANIA. IT
WILL BE COOLER WEDNESDAY AND RAIN SHOWERS MAY BE POSSIBLE THROUGH
THE AFTERNOON. HIGH PRESSURE WILL BUILD OVER THE REGION THURSDAY
BRINGING DRY AND BEAUTIFUL WEATHER.

&&

.NEAR TERM /THROUGH TONIGHT/...
1230 PM EDT UPDATE...
ADJUSTED NEAR TERM POPS TO MATCH REALITY ON THE RADAR. EXPECT
THESE SHOWERS TO SLOWLY PUSH EAST. THERE APPEARS TO BE A GAP
BETWEEN THE FROPA AND THE 1ST ROUND OF SHOWERS. HRRR MODEL APPEARS
TO BE DOING VERY WELL WITH THE PLACEMENT OF THE SHOWER ACTIVITY
AND DECIDED TO LEAN TOWARDS THE OUTPUT OF THE MODEL. OTHERWISE
PREVIOUS FORECAST LOOKS GOOD. 

PREVIOUS FORECAST...
1150 AM EDT UPDATE...
TWO FEATURES OF INTEREST WILL MOVE ACROSS THE CWA TODAY BRINGING
THE CHANCE FOR RAIN SHOWERS ACROSS NEPA AND CNY. THE FIRST FEATURE
OF INTEREST IS THE IS A SUBTLE TROUGH THAT IS PRESENTLY OVER
WESTERN NEW YORK. THIS TROUGH IS WHATS PRODUCING THE RAIN SHOWERS
THIS MORNING. THE TROUGH WILL MOVE EAST THIS MORNING AND EJECT A
VORT MAX ACROSS CENTRAL NY. THIS LEADING TROUGH IS MOST PRONOUNCED
AT 700MB... AND BELIEVE THIS WILL CREATE MID LVL INSTABILITY WHICH
MAY PRODUCE SOME THUNDER ACROSS NE PA AND POSSIBLY CENTRAL NY.
MOISTURE WILL BE LIMITED WITH THIS SYSTEM AS NO DIRECT CONNECTION
WITH THE GULF IS OCCURRING. PWAT VALUES ARE MOSTLY BELOW AN INCH
AND VERY DRY AIR AT THE SFC IS STILL PRESENT ACROSS THE EASTERN
PORTIONS OF THE CWA. AFTER THAT BEING SAID... WE MAY SEE UP TO A
QUARTER OF AN INCH OR RAIN OVER THE CWA THIS AFTERNOON. IF
CONVECTION IS ABLE TO DEVELOP... ISOLATED AREAS MAY SEE SLIGHTLY
HIGHER AMOUNTS.

EXPECT THE FIRST WAVE TO MOVE EAST OF THE CWA BY AROUND 18Z.
TEMPERATURE ACROSS THE REGION TO RISE INTO THE UPPR 60S TO LOW 70S
THIS AFTERNOON DESPITE THE DENSE CLOUD COVERAGE... WHICH IS EXPECT
TO LAST FOR MOST OF THE DAY.

THE SECOND FEATURE OF INTEREST IS THE MORE PROMINENT UPPR LVL LOW
WHICH IS LOCATED OVER THE GREAT LAKES REGION. THIS LOW WILL MOVE
EAST TODAY AND FORCE A COLD FRONT ACROSS THE CWA. THE FRONT IS
EXPECTED TO BE THROUGH MOST OF THE CWA BY 00Z TONIGHT. THIS FRONT
WILL BRING US AN ADDITIONAL SHOT FOR RAIN SHOWERS WITH THE
PASSAGE... AKA... A TYPICAL ANA FRONT SCENARIO. TEMPS BEHIND THE
FRONT WILL SLOWLY DECREASE INTO THE 30S LATE TONIGHT. THE FRONT IS
FOLLOWING CLOSELY BEHIND THE LEADING WAVE. THIS FRONT WILL AID TO
THE DEVELOPMENT OF RAIN SHOWERS AND CAN BE SEEN WITH AS AN
ADDITIONAL LINE OF SHOWERS BEHIND THE FIRST SYSTEM COMPRISED OF
HIGHER REFLECTIVITY.

&&

.SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/...
3 AM UPDATE...

WED COOL AND SHOWERY WITH SLOWING STACKED LOW IN ERN NEW ENGLAND.
NW CAA FLOW WILL ADD SOME LAKE MOISTURE BUT TEMPERATURE
DIFFERENTIAL NOT ENOUGH FOR PURE LAKE EFFECT. WED MORN SECONDARY
COLD FRONT GOES THROUGH THEN SHOWER COVERAGE WILL DECREASE THE
REST OF THE DAY. LATE WED THE LAST OF THE SHOWERS SHOULD END. WITH
CAA SFC MAX TEMPS WILL STRUGGLE INTO THE U40S AND L50S.

WED NGT WILL BE COLD WITH WINDS BECOMING LIGHT AND CLEAR SKIES.
LOWS U20S TO A30. 

THU WILL BE A NICE DAY WITH TEMPS RECOVERING INTO THE 50S AND EVEN
L60S SRN VALLEYS. SKIES MOSTLY SUNNY UNDER AN UPPER LEVEL RIDGE
AND SFC HIGH DURING THE AFTN. 

THU NGT INCREASING CLOUDS AHEAD OF THE NEXT FRONT FRI AFTN. PRECIP
SHOULD HOLD OFF WITH THE HIGH ONLY MOVG INTO ERN NY. TREND AGAIN
TO DELAY THE FRONT A FEW HOURS.

&&

.LONG TERM /FRIDAY THROUGH MONDAY/...
3 AM UPDATE...
LITTLE CHANGE. AGAIN FOLLOWED WPC GUIDANCE. DIFFERENCES IN MODELS
WILL MAKE A BIG DIFFERENCE IN TEMPERATURES AND PRECIP TYPES.
POSITIONING OF FRONTS WILL MAKE A DIFFERENCE TOO. BOTTOM LINE
UNSETTLED AND COOL. 

PREVIOUS DISCUSSION...
GFS AND ECMWF ARE IN GOOD AGREEMENT WITH THE PATTERN THROUGH
SATURDAY THEN DIFFERENCES DEVELOP FOR SUNDAY INTO EARLY NEXT WEEK.
BOTH MODELS AGREE WITH THE IDEA THAT A SHORT WAVE AND ASSOCIATED
SURFACE COLD FRONT PASS EAST ACROSS THE AREA ON FRIDAY BRINGING A
CHANCE OF SHOWERS. LITTLE INSTABILITY IS INDICATED AND NO THUNDER
WILL BE MENTIONED IN THE FORECAST. SCATTERED SHOWERS MAY LINGER
INTO SATURDAY ALONG WITH SOMEWHAT COOLER CONDITIONS AS AN UPPER
TROUGH MOVES EAST ACROSS SOUTHERN CANADA. THE GFS IS SLOWER AND
MORE AMPLIFIED WITH THE UPPER TROUGH KEEPING A CHANCE OF SHOWERS
AND MUCH COOLER WEATHER SUNDAY INTO EARLY NEXT WEEK... WHILE THE
ECMWF IS MORE PROGRESSIVE INDICATING A MAINLY DRY SCENARIO FOR
SUNDAY INTO MONDAY. WITH THIS UNCERTAINTY HAVE KEPT LOW CHC POPS
GOING SUNDAY THROUGH MONDAY. REGARDLESS OF RAIN CHANCES
TEMPERATURES WILL LIKELY BE AT LEAST A LITTLE BELOW NORMAL
SATURDAY THROUGH MONDAY. 

DESPITE SOME DOWNSTREAM DISAGREEMENT BOTH THE GFS AND ECMWF
INDICATE THE DEVELOPMENT OF A STRONG UPPER LEVEL RIDGE OVER
CENTRAL CANADA EARLY NEXT WEEK WHICH SHOULD FAVOR AT LEAST SOME
TROUGHING AND BELOW NORMAL TEMPERATURES OVER THE EASTERN U.S.

&&

.AVIATION /18Z TUESDAY THROUGH SUNDAY/...
18Z UPDATE...
AREA OF VFR SHOWERS IS MOVING THROUGH TERMINALS AT THIS TIME AND
POTENTIAL STILL EXISTS FOR BFR MVFR VSBY RESTRICTION IN THE NEXT
HOUR OR TWO AS THEY MOVE THROUGH. REMOVED -TSRA AS IT DOES NOT
APPEAR ANY THUNDER WILL DEVELOP TODAY. COLD FRONT WILL MOVE
THROUGH AROUND 19Z AT NY TERMINALS AND CLOSER TO 21Z AT KAVP.
AFTER IT DOES SO, LOW LEVEL MOISTURE IN COLD AIR ADVECTION WILL
LEAD TO MVFR CIGS TONIGHT, POSSIBLY AS LOW AS IFR AT KITH BETWEEN
08Z AND 12Z. CIGS EXPECTED TO RANGE FROM 1500-2500FT OVERNIGHT.
MAY SEE AN UNRESTRICTED SHOWER AS UPPER LEVEL TROF PASSES AFTER
06Z. EXPECT CIGS TO RISE TO VFR AT KSYR, KELM AND KAVP AFTER 14Z
WEDNESDAY WITH REMAINING TERMINALS EXPERIENCING MVFR CIGS THROUGH
THE END OF TAF VALID TIME.

WINDS FROM THE SSW AROUND 10KTS WILL QUICKLY SHIFT TO A MORE
WESTERLY FLOW IN THE NEXT HOUR OR TWO AS COLD FRONT PASSES.
NORTHWEST WINDS EXPECTED TONIGHT AROUND 10KTS WITH OCCASIONAL
GUSTS BETWEEN 15-20KTS, BECOMING GUSTIER DURING THE DAY WEDNESDAY
BUT REMAINING OUT OF THE NORTHWEST. 

OUTLOOK...

WED NGT-THU NGT...VFR.

FRI-SUN... RESTRICTIONS POSSIBLE IN RAIN SHOWERS.

&&

.FIRE WEATHER...
645 AM UPDATE... DESPITE POOR HUMIDITY RECOVERY OVERNIGHT...A
COLD FRONT WILL BRING UP TO A FEW TENTHS OF AN INCH OF RAIN INTO
THE AREA THIS AFTERNOON TO EARLY EVENING...PUTTING A HOLD ON FIRE
WEATHER CONCERNS AFTER THE RECENT WARM DRY SPELL.

NEXT DAY TO WATCH WILL BE THURSDAY WITH 10 TO 20 MPH WINDS AND RH 
BELOW 30 PERCENT. QUESTION HERE WHETHER FUELS WILL DRY OUT IN
TIME.

&&

.BGM WATCHES/WARNINGS/ADVISORIES...
PA...NONE.
NY...NONE.

&&

$$
SYNOPSIS...KAH
NEAR TERM...KAH
SHORT TERM...TAC
LONG TERM...JAB/MSE/TAC
AVIATION...PVN
FIRE WEATHER...




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