Area Forecast Discussion
Issued by NWS Albany, NY

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000
FXUS61 KALY 010422
AFDALY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ALBANY NY
1222 AM EDT WED JUL 1 2015

.SYNOPSIS...
AS A WARM FRONT MOVES CLOSER TO THE AREA AND A DISTURBANCE IN THE
UPPER LEVELS OF THE ATMOSPHERE PASSES OVERHEAD THE THREAT FOR
SCATTERED SHOWERS WILL CONTINUE OVERNIGHT WITH ISOLATED
THUNDERSTORMS POSSIBLE. THE CHANCES FOR SHOWERS AND THUNDERSTORMS
WILL CONTINUE WEDNESDAY AS A COLD FRONT APPROACHES THE REGION.
HIGH PRESSURE BUILDS IN FROM THE GREAT LAKES REGION WEDNESDAY
NIGHT INTO THURSDAY WITH FAIR AND DRIER WEATHER.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
AS OF 1220 AM EDT...A WARM FRONT REMAINS TO THE WEST AND SOUTH OF
THE LOCAL AREA AND ITS BECOME QUASI STATIONARY. THE THREAT OF
SHOWERS WILL CONTINUE OVERNIGHT AS THE FRONTAL BOUNDARY EDGES
CLOSER AND A PIECE OF SHORT WAVE ENERGY MOVES NORTHEASTWARD AND
PASSES OVER THE REGION. CAN NOT RULE OUT ISOLATED THUNDERSTORMS AS
WILL HAVE ELEVATED INSTABILITY ACROSS THE REGION...INDICATED BY
THE MODELS WITH NEGATIVE SHOWALTER VALUES.

THE MESOSCALE MODELS ARE HAVING A HARD TIME DEPICTING HOW THE
CONVECTION WILL MOVE AND BEHAVE ACROSS THE LOCAL AREA OVERNIGHT.
THE STRONGER MORE ROBUST CONVECTION CONTINUES IN THE WARM SECTOR
AND WEAKENS AS IT MOVES AWAY FROM THE BOUNDARY AND INSTABILITY.

OVERALL ACTIVITY IS EXPECTED INCREASE AGAIN BTWN 09Z-12Z...AS
ANOTHER SHORT-WAVE IMPULSE/WEAK SFC LOW WILL MOVE ALONG THE WARM
FRONT SOUTH OF THE REGION AND IMPACT SRN NY AND NEW ENGLAND. WE
HAVE INCREASED THE POPS TO LIKELY AND LOW CATEGORICAL VALUES EAST
OF THE HUDSON RIVER VALLEY AT THIS TIME. NOT EXPECTING ANY
BONAFIDE SEVERE THREATS WITH VERY LITTLE SFC BASED INSTABILITY
/GENERALLY LESS THAN 250 J/KG/. THERE ARE POCKETS OF WEAK ELEVATED
INSTABILITY ACROSS THE REGION WITH SHOWALTER VALUES BTWN 0C AND
-1C...SO A SLIGHT CHC OF THUNDERSTORMS WAS KEPT IN THE FCST
EVERYWHERE TONIGHT. PWATS WILL TEND TO BE IN THE 1-1.50 INCH RANGE
WITH THE HIGHER VALUES S/SE OF THE IMMEDIATE GREATER CAPITAL
REGION. SOME BURSTS OF MDT-HEAVY RAIN WILL BE POSSIBLE THERE. THE
QUESTION WILL BE HOW QUICKLY THE WARM FRONT MOVES THROUGH PARTS OF
THE FCST AREA.

LOWS TONIGHT WITH BE ON THE MUGGIER SIDE WITH INCREASED HUMIDITY
LEVELS WITH U50S TO M60S OVER THE FCST AREA.

&&

.SHORT TERM /6 AM THIS MORNING THROUGH THURSDAY NIGHT/...
TOMORROW...COMPLICATED FCST WITH MULTIPLE SHORT-WAVES MOVING THRU
THE UPPER- LEVEL TROUGH. THE TROUGH SHIFTS FROM BEING NEUTRAL-
TILTED TO NEGATIVELY TILTED...WHICH WILL HELP A COLD FRONT TO
MOVE ACROSS THE REGION DURING THE AFTERNOON.

IN THE MORNING...ONGOING SHOWERS AND THUNDERSTORMS WILL OCCUR AHEAD
OF THE COLD FRONT IN THE WARM SECTOR...AS THE WEAK SFC LOW/SFC
TROUGH MOVES THROUGH IN THE MORNING. THE BETTER DEEP SHEAR ACROSS
THE ERN HALF OF THE FCST AREA WILL BE IN THE MORNING OR PRIOR TO
18Z TOMORROW WITH 0-6 KM BULK SHEAR VALUES OF 40-55 KTS. SOME
BANDS OF CONVECTION MAY FORM IN THE STRONGLY SHEARED ENVIRONMENT.
THE 0-1 KM BULK SHEAR VALUES ARE GENERALLY IN THE 15-25 KT
RANGE...BUT THE INSTABILITY IS LIMITED IN THE MORNING INITIALLY AT
LESS THAN 500 J/KG...BUT IT MAY INCREASE TO 1000-1500 J/KG BASED
ON THE LATEST GFS BY 18Z...AND THE NAM IS SIMILAR WITH ROUGHLY
SBCAPES OF 1000-1500 J/KG WITH SFC DEWPTS IN THE 60S.
HOWEVER...THE NAM LINGERS THE MODERATE AMOUNTS OF INSTABILITY
UNTIL 21Z AHEAD OF THE COLD FRONT...AND ANOTHER SHORT-WAVE. THE
LEFT FRONT QUAD OF AN H500/H250 JET STREAK WILL ALSO BE
APPROACHING CNTRL-ERN NY BTWN 18Z-00Z. THIS WOULD BE MEAN SOME
STRONG THUNDERSTORMS...POSSIBLY ISOLATED OR SCATTERED SEVERE WOULD
BE POSSIBLE IN THE MID TO LATE PM...IF ENOUGH SFC HEATING OCCURS.

THE BETTER SHEAR IS DEPARTING IN THE MORNING...BUT AHEAD OF THE
FRONT...THE 0-6 KM SHEAR SHOULD INCREASE AGAIN TO 30-40 KTS FOR
SOME MULTI-CELL CLUSTERS/LINES WITH DAMAGING WINDS /BOWING
SEGMENTS/ THE MAIN THREAT...AS THE MID LEVEL LAPSE RATES ARE
GENERALLY 5-6 C/KM IN THE AFTERNOON...BUT STEEPER IN THE
MORNING/VERY EARLY PM. HAIL LOOKS LIKE IT WOULD BE A SECONDARY
THREAT. SPC KEEPS MOST OF THE FCST AREA IN A MARGINAL RISK. WE
KEEP MENTION IN THE HWO OF GUSTY WINDS AND HAIL. NO ENHANCED
WORDING IN THE ZONES/GRIDS UNTIL THIS BECOMES A BIT CLEARER. IF
THE CLOUD COVER REMAINS IN PLACE THE THREAT WILL BE GREATLY
DIMINISHED FOR THE SEVERE POTENTIAL. TEMPS TOMORROW WILL BE IN THE
U70S TO L80S /MAINLY THE MID HUDSON VALLEY AND NW CT/ IN MANY OF
THE VALLEY AREAS...AND U60S TO M70S OVER THE HILLS AND MTNS.

WED NIGHT...BETTER AGREEMENT WITH THE NAM/GFS/ECMWF AND ENSEMBLES
THAT THE SHORT-WAVE AND COLD FRONT MOVE THROUGH THE FCST AREA IN
THE EARLY EVENING. THE SHOWERS AND ISOLD-SCT THUNDERSTORMS SHOULD
END IN THE EARLY EVENING. SOME ISOLD SHOWERS MAY LINGER NORTH AND
WEST OF THE CAPITAL REGION UNTIL MIDNIGHT. COOLER AND DRIER AIR
WILL START TO FILTER INTO THE REGION WITH THE COLD ADVECTION IN
THE WAKE OF THE FRONT. H850 TEMPS LOWER TO -6C TO -8C NORTH AND
WEST OF THE CAPITAL DISTRICT...AND -8C TO -11C TO THE SOUTH AND
EAST. LOWS WILL BE MAINLY IN THE MID TO U50S WITH SOME U40S TO
L50S OVER THE HIGHER TERRAIN.

THU-THU NIGHT...HIGH PRESSURE BEGINS TO RIDGE IN FROM THE UPPER
MIDWEST AND W-CNTRL GREAT LAKES REGION. THE LATEST CONSENSUS FROM
GUIDANCE IS FOR THE FRONT TO SAG FAR ENOUGH SOUTH FOR A DRIER
FORECAST FOR THU. THE POPS HAVE BEEN REMOVED FOR THU. CLOUDS WILL
BE MORE PREVALENT SOUTH OF THE CAPITAL DISTRICT WITH PARTLY TO
MOSTLY SUNNY CONDITIONS TO THE NORTHERN HALF.  CYCLONIC FLOW WILL
PERSIST ALOFT FOR A COOL SECOND DAY FOR JULY. THE GFS CONTINUES TO
HAVE H850 TEMPS OF +8C TO +12C OVER THE FCST AREA FROM NW TO SE.
HIGHS ON THU WILL RANGE FROM THE MID AND U70S IN MANY OF THE
VALLEY AREAS...WITH A FEW 80F READINGS IN THE MID HUDSON
VALLEY...AND M60S TO M70S OVER THE HILLS AND MTNS. CLEARING SKIES
AND COOL CONDITIONS ARE EXPECTED THU NIGHT WITH THE SFC RIDGE
BUILDING EASTWARD. LOWS IN THE U40S TO L50S WILL BE COMMON NORTH
AND WEST OF THE IMMEDIATE CAPITAL DISTRICT...AND MID AND U50S FROM
THE CAPITAL DISTRICT SOUTH AND EAST.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
HEIGHTS WILL BE ON THE RISE AS WE HEAD INTO THE HOLIDAY
WEEKEND. LOOKING AT A DRY DAY WITH HIGHS TEMPERATURES
EXPECTED TO FALL JUST SHORT OF NORMAL...IN THE 70S.

ANOTHER SHORT WAVE TROUGH IS EXPECTED TO PASS TO OUR NORTH
ACROSS EASTERN CANADA ON SATURDAY WITH THE UPPER FLOW FAIRLY
ZONAL ACROSS NEW YORK STATE. THE ECMWF IS STRONGER WITH THE
FEATURE WITH AN UPPER LOW CLOSING OFF TO OUR NORTH...WHILE
THE GFS KEEPS THE WAVE OPEN. EITHER WAY WEAK FORCING IS
INDICATED BY THE MODELS ACROSS OUR AREA SO JUST HAVE SLIGHT
CHANCE POPS ACROSS MOST OF THE FORECAST AREA WITH THE HEATING
OF THE DAY. TEMPERATURES ARE ANTICIPATED TO BE A COUPLE DEGREES
WARMER THAN FRIDAY.

THERE ARE DIFFERENCES IN THE MODELS AS WE HEAD INTO THE LATTER
PART OF THE WEEKEND AND INTO NEXT WEEK WITH TIMING AND AMPLITUDE
OF SYSTEMS.

AT THIS TIME...SUNDAY IS LOOKING DRY WITH SEASONABLE WARM TEMPERATURES
WITH HEIGHTS RIDGING. SUNDAY WILL BE EVEN WARMER WITH HIGHS FORECAST
IN THE MID 70S TO MID 80S.

THE WEATHER WILL TURN UNSETTLED AS WE HEAD INTO NEXT WEEK AS A LOW
PRESSURE SYSTEM GRADUALLY APPROACHES. WE COULD HAVE ANOTHER DRY DAY
MONDAY WITH BETTER CHANCES FOR STORMS TUESDAY. TEMPERATURES WILL BE AT
OR BIT ABOVE NORMAL WITH SOUTHERLY SLOW AHEAD OF THE APPROACHING SYSTEM.

&&

.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
A WARM FRONT REMAINS TO THE WEST AND SOUTH OF THE LOCAL AREA AND
ITS BECOME QUASI STATIONARY. SCATTERED SHOWERS WILL CONTINUE
TONIGHT AS THE FRONTAL BOUNDARY EDGES CLOSER AND A PIECE OF SHORT
WAVE ENERGY MOVES NORTHEASTWARD AND PASSES OVER THE REGION. CAN
NOT RULE OUT ISOLATED THUNDERSTORMS AS WILL HAVE ELEVATED
INSTABILITY ACROSS THE REGION...INDICATED BY THE MODELS WITH
NEGATIVE SHOWALTER VALUES.

THE MESOSCALE MODELS ARE HAVING A HARD TIME DEPICTING HOW THE
CONVECTION WILL MOVE AND BEHAVE ACROSS THE LOCAL AREA TONIGHT.
THE STRONGER MORE ROBUST CONVECTION CONTINUES IN THE WARM SECTOR
AND WEAKENS AS IT MOVES AWAY FROM THE BOUNDARY AND INSTABILITY.

A LULL IN THE SHOWERS SHOULD OCCUR OVERNIGHT...HOWEVER AN INCREASE
IN ACTIVITY IS EXPECTED WEDNESDAY AS ADDITIONAL PIECES OF SHORT
WAVE ENERGY ROTATES ABOUT THE BASE OF THE TROUGH AND ITS BEGINS TO
BECOME NEGATIVELY TILTED WEDNESDAY AND A COLD FRONT APPROACHES.

WIDESPREAD MVFR IS EXPECTED TO DEVELOP WITH GUIDANCE INDICATING A
PERIOD OF IFR POSSIBLE LATE TONIGHT/EARLY WEDNESDAY MORNING. AN
IMPROVEMENT TO VFR SHOULD OCCUR AS THE ATMOSPHERE BEGINS TO MIX
AND THE AREA GETS IT THE WARM SECTOR. HOWEVER MVFR CONDITIONS
ALONG WITH BRIEF IFR WILL BE POSSIBLE WITH ANY CONVECTION. AT THIS
TIME HAVE USED VICINITY SHOWERS TO ADDRESS THREAT AS DO NOT HAVE
THE CONFIDENCES TO TIME ACTIVITY TO INDIVIDUAL TAFS SITES.

LIGHT AND VARIABLE TO CALM WINDS TONIGHT WILL BECOME SOUTHERLY
WEDNESDAY AND ARE EXPECTED TO BE GUSTY AT KALB WITH GUSTS TO
AROUND 20 KNOTS. WINDS ARE EXPECTED TO SHIFT TO THE WEST LATE IN
THE DAY WITH THE PASSAGE OF A PRE-FRONTAL TROUGH.

OUTLOOK...

WED NIGHT: MODERATE OPERATIONAL IMPACT. CHANCE OF SHRA. THU-FRI
NIGHT: NO OPERATIONAL IMPACT. NO SIG WX. INDEPENDENCE DAY-SAT
NIGHT: LOW OPERATIONAL IMPACT. SLIGHT CHANCE OF SHRA...TSRA. SUN:
NO OPERATIONAL IMPACT. NO SIG WX.

&&

.FIRE WEATHER...
SHOWERS AND ISOLATED TO SCATTERED THUNDERSTORMS WILL
CONTINUE TONIGHT AHEAD OF A WARM FRONT AND AN UPPER LEVEL
DISTURBANCE.  THE THREAT FOR SHOWERS AND THUNDERSTORMS CONTINUES
TOMORROW...AS A COLD FRONT WILL MOVE ACROSS THE REGION.  HIGH
PRESSURE BUILDS IN FROM THE UPPER MIDWEST AND GREAT LAKES REGION
WEDNESDAY NIGHT INTO THURSDAY WITH FAIR AND DRIER WEATHER RETURNING
TO EASTERN NEW YORK AND WESTERN NEW ENGLAND.

&&

.HYDROLOGY...
SHOWERS AND ISOLATED TO SCATTERED THUNDERSTORMS WILL CONTINUE
INTO WEDNESDAY AHEAD OF MULTIPLE UPPER LEVEL DISTURBANCES...AND A
COLD FRONT. SOME OF THE THUNDERSTORMS MAY PRODUCE LOCALLY HEAVY
RAINFALL TONIGHT INTO WEDNESDAY...BUT OVERALL WIDESPREAD HYDRO
PROBLEMS ARE NOT EXPECTED ASIDE FROM PONDING OF WATER ON
ROADWAYS...AND ISOLATED POOR DRAINAGE FLOODING OF LOW LYING OR
URBAN AREAS. TOTAL RAINFALL THROUGH WEDNESDAY LOOKS TO BE IN THE
THIRD OF AN INCH TO INCH RANGE. LOCALLY HIGHER AMOUNTS ARE
POSSIBLE WITH ANY CONVECTION.

A PERIOD OF DRIER WEATHER RETURNS WEDNESDAY NIGHT INTO THE
HOLIDAY WEEKEND. THIS STRETCH OF DRIER WEATHER WILL ALLOW FOR
RIVER FLOWS TO LOWER FROM THE PAST WEEK OF RAIN.

FOR DETAILS ON SPECIFIC AREA RIVERS AND LAKES...INCLUDING OBSERVED
AND FORECAST RIVER STAGES AND LAKE ELEVATIONS...PLEASE VISIT THE
ADVANCED HYDROLOGIC PREDICTION SERVICE /AHPS/ GRAPHS ON OUR
WEBSITE.

&&

.CLIMATE...
JUNE PRECIPITATION THROUGH 4 PM JUNE 30 (DEPARTURE FROM NORMAL)

ALBANY NY: 6.70 INCHES (+2.91 INCHES)
GLENS FALLS: 6.16 INCHES (+2.61 INCHES)
POUGHKEEPSIE NY: 4.06 INCHES (-0.37 INCHES)
BENNINGTON VT: 2.94 INCHES (-1.19 INCHES)
PITTSFIELD MA: 8.13 INCHES (+3.73 INCHES)

ALBANY NEEDS MORE 0.55 INCHES TO MAKE IT INTO THE TOP 10 WETTEST
JUNES SINCE 1826. THE WETTEST IS 8.74 INCHES SET BACK IN 2006.

JUNE 2015 IS ALREADY THE 6TH WETTEST FOR GLENS FALLS SINCE 1949.
THE WETTEST IS 8.20 INCHES SET BACK IN 1998.

POUGHKEEPSIE NEEDS MORE 1.20 INCHES TO MAKE IT INTO THE TOP 10
WETTEST JUNES SINCE 1949. THE WETTEST IS 9.82 INCHES SET BACK IN
2013.

&&

.ALY WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
NY...NONE.
MA...NONE.
VT...NONE.

&&

$$
SYNOPSIS...IAA/WASULA
NEAR TERM...IAA/11/WASULA
SHORT TERM...WASULA
LONG TERM...IAA
AVIATION...IAA
FIRE WEATHER...11/WASULA
HYDROLOGY...11/WASULA
CLIMATE...



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