Area Forecast Discussion
Issued by NWS Buffalo, NY

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000
FXUS61 KBUF 011459
AFDBUF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BUFFALO NY
1059 AM EDT MON SEP 1 2014

.SYNOPSIS...
IT WILL BE A WARM AND HUMID LABOR DAY WITH A FEW SPOTTY SHOWERS AND
THUNDERSTORMS POSSIBLE ACROSS WESTERN NEW YORK THIS AFTERNOON...BUT
THE VAST MAJORITY OF THE DAY SHOULD BE RAIN FREE. A COLD FRONT WILL
THEN CROSS THE REGION ON TUESDAY WITH MORE WIDESPREAD SHOWERS AND
THUNDERSTORMS. HIGH PRESSURE WILL THEN BUILD INTO THE LOWER LAKES
BEHIND THIS COLD FRONT AND BRING DRY WEATHER WEDNESDAY AND THURSDAY.

&&

.NEAR TERM /THROUGH TONIGHT/...
AS OF 1455Z...REGIONAL SATELLITE IMAGERY AND SURFACE OBS SHOWS LOW
STRATUS STILL LINGERING ACROSS PORTIONS OF LAKE ONTARIO...THE NORTH
COUNTRY...AND THE WESTERN SOUTHERN TIER. ELSEWHERE...ANY OTHER LOWER
CLOUDS ARE LIFTING/GIVING WAY TO SOME DIURNAL CU WITH INCREASING
DAYTIME HEATING...WHILE MOSTLY SUNNY SKIES STILL PERSIST ACROSS A
SIZABLE PORTION OF THE GENESEE VALLEY AND WESTERN FINGER LAKES.
THROUGH MIDDAY...STRENGTHENING HEATING SHOULD HELP TO MIX OUT THE
LEFTOVER LOWER CLOUDS...WHILE ALSO LEADING TO THE CONTINUED
DEVELOPMENT OF DIURNAL CU. THIS SHOULD RESULT IN PARTLY TO MOSTLY
SUNNY SKIES AREAWIDE BY EARLY THIS AFTERNOON.

OTHERWISE...OUR REGION WILL BE MAINLY BETWEEN SYSTEMS TODAY WITH A
WEAK TROUGH MOVING OFF THE MID ATLANTIC COAST AND THE NEXT COLD
FRONT REMAINING WELL UPSTREAM ACROSS THE WESTERN LAKES. THIS WILL
LEAVE LITTLE IN THE WAY OF SYNOPTIC SCALE FORCING...WITH MODEL
GUIDANCE SHOWING JUST A VERY WEAK VORTICITY MAXIMA MOVING AROUND THE
NORTHERN PERIPHERY OF THE MID LEVEL RIDGE AND CROSSING WESTERN NY
THIS AFTERNOON. THIS STATED...THERE WILL LIKELY BE A SUBTLE
MESOSCALE CONVERGENCE ZONE JUST INLAND FROM LAKE ERIE...SEPARATING
ENHANCED FLOW CHANNELING DOWN THE LAKE FROM WEAKER AND SLIGHTLY MORE
BACKED WINDS INLAND. SURFACE TEMPERATURES WILL WARM INTO THE LOWER
TO MID 80S WITH DEWPOINTS IN THE UPPER 60S TO NEAR 70. THIS WILL
YIELD AROUND 1500J/KG OF SBCAPE...ALTHOUGH WARM MID LEVELS MAY KEEP
SOME CINH IN THE PROFILE. THE BEST CHANCE OF ANY DEEP MOIST
CONVECTION WILL BE ALONG THE AFOREMENTIONED BOUNDARY...WHICH MAY
ORGANIZE LOW LEVEL MASS CONVERGENCE ENOUGH TO BREACH THE MID LEVEL
CAP. WITH THIS IN MIND HAVE MAINTAINED A CORRIDOR OF CHANCE POPS
FROM CHAUTAUQUA COUNTY NORTHEASTWARD ACROSS THE SOUTHEASTERN HALF OF
THE BUFFALO AREA TO ROCHESTER AND THE WESTERN FINGER LAKES THIS
AFTERNOON. NORTH AND WEST OF THIS...THE SSW FLOW OFF LAKE ERIE WILL
LIKELY KEEP NORTHERN PORTIONS OF THE NIAGARA FRONTIER DRY...WHILE
FURTHER OFF TO THE EAST THE NORTH COUNTRY SHOULD STAY DRY WITH LESS
INSTABILITY AND NO TRIGGER PRESENT.

THIS EVENING ANY DIURNALLY DRIVEN SHOWERS AND STORMS WHICH DO
DEVELOP SHOULD WEAKEN AND DISSIPATE BY EARLY TO MID EVENING. THIS
SHOULD LEAVE THE AREA DRY AND PARTLY CLOUDY BEFORE THE NEXT SYSTEM
APPROACHES AFTER MIDNIGHT. MID LEVEL HEIGHT FALLS WILL APPROACH
WESTERN NY LATE...WITH A LEAD CONVECTIVELY AUGMENTED SHORTWAVE
ARRIVING SHORTLY AFTER 12Z TUE. DPVA AHEAD OF THIS FEATURE WILL
PROVIDE INCREASING LARGE SCALE ASCENT LATE TONIGHT...AND UPPER LEVEL
DIVERGENCE WILL INCREASE AS THE RIGHT ENTRANCE REGION OF A 90+ KNOT
UPPER LEVEL JET APPROACHES. THIS WILL ALL PRODUCE INCREASING CHANCES
OF SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS LATE TONIGHT.

HIGH DEWPOINTS AND AN INCREASING SSW GRADIENT WILL KEEP TEMPERATURES
WARM AND MUGGY OVERNIGHT...WITH LOWS AROUND 70 ON THE LAKE PLAINS
AND MID 60S ACROSS THE HIGHER TERRAIN.

&&

.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
A COLD FRONT IS STILL ON TRACK TO CROSS THE FORECAST AREA DURING THE
DAY ON TUESDAY. SHOWERS AND THUNDERSTORMS ARE LIKELY OUT AHEAD OF
AND ALONG THE BOUNDARY. EXPECT PRECIPITATION TO MOVE INTO WESTERN
NEW YORK TUESDAY MORNING...REACHING NORTHCENTRAL NEW YORK BY EARLY
AFTERNOON...THEN TAPER OFF FROM WEST TO EAST THROUGH EARLY EVENING.
THUNDERSTORM POTENTIAL REMAINS HIGH WITH FORECAST SBCAPES GENERALLY
RUNNING BETWEEN 1000-1500 J/KG COMBINED WITH LIFTED INDEX VALUES
AROUND -3C...OR EVEN A BIT LOWER BY EARLY AFTERNOON. 0-6KM BULK
SHEAR WILL BE AROUND 30-35KT...WHICH IS NOT QUITE AS HIGH AS I`D
LIKE TO SEE FOR BETTER SEVERE POTENTIAL. KEY FACTOR WILL BE THE
AMOUNT OF SURFACE HEATING THAT TAKES PLACE BEFORE FROPA...I.E. WILL
CLOUD COVER MOVE IN TOO EARLY AND LIMIT HEATING...AND THUS THE
AMOUNT OF INSTABILITY. CENTRAL AND NORTHERN NEW YORK HAVE THE BEST
SHOT AT SEEING THE MOST SUNSHINE OUT AHEAD OF THE FRONT...SO THIS
MAY BE THE MOST FAVORED AREA FOR STRONGER STORMS. IN ADDITION...TALL
SKINNY CAPE PROFILES SHOWN IN BUFKIT AND HIGH PRECIPITABLE WATER
VALUES OF 1.7"-1.9" OUT AHEAD OF THE BOUNDARY OFFERS THE RISK FOR
HEAVY DOWNPOURS WITH ANY THUNDERSTORM. ALL THESE FACTORS TAKEN INTO
CONSIDERATION...IT APPEARS THERE MAY SOME STRONG STORMS...WITH A FEW
STORMS POSSIBLY REACHING SEVERE LIMITS. MAIN THREATS APPEAR TO BE
GUSTY WINDS ASSOCIATED WITH ANY BOWING LINE SEGMENTS...AND TO A
LESSER EXTENT MARGINALLY SEVERE HAIL. IT WILL BE ANOTHER WARM DAY
WITH HIGHS MAINLY IN THE UPPER 70S TO LOWER 80S.

THE COLD FRONT WILL SLIDE SOUTH AND EAST OF THE FORECAST AREA
TUESDAY NIGHT...TAKING THE SHOWERS AND STORMS WITH IT. ALTHOUGH A
FEW SHOWERS WILL STILL BE POSSIBLE DURING THE EVENING ACROSS EASTERN
AREAS...BUT EVEN HERE THINGS WILL DRY OUT LATER TUESDAY NIGHT AS
SURFACE HIGH PRESSURE LOCATED ACROSS THE OHIO VALLEY STARTS TO BUILD
EAST ACROSS THE REGION. LOWS WILL BE GENERALLY IN THE UPPER 50S TO
LOWER 60S.

LOW AMPLITUDE BROAD UPPER LEVEL RIDGING AND SURFACE HIGH PRESSURE
WILL FOLLOW THE COLD FRONT FOR WEDNESDAY AND WEDNESDAY NIGHT WITH A
DRIER MORE COMFORTABLE AIRMASS...BUT NOT MUCH COOLER TEMPERATURE
WISE. EXPECT MOSTLY SUNNY SKIES THROUGHOUT THE REGION AND HIGH TEMPS
IN THE MID TO UPPER 70S...FOLLOWED BY A CLEAR NIGHT WITH LOWS
DROPPING BACK INTO THE 50S.

&&

.LONG TERM /THURSDAY THROUGH SUNDAY/...
UPPER LEVEL RIDGING AND SURFACE HIGH PRESSURE WILL REMAIN ACROSS THE
REGION ON THURSDAY. HIGH PRESSURE WILL THEN SLIDE OFF THE NEW
ENGLAND COAST LATE THURSDAY INTO FRIDAY. THIS WILL KEEP CONDITIONS
MAINLY DRY ON THURSDAY BEFORE THE NEXT FRONTAL SYSTEM APPROACHES FOR
LATE IN THE WEEK AND EARLY WEEKEND. BOTH THE 06Z GFS AND 00Z ECMWF
HAVE A COLD FRONT MOVING INTO THE LOWER GREAT LAKES BY FRIDAY NIGHT.
HOWEVER THE 06Z GFS SWEEPS THE FRONT THROUGH NEW YORK STATE DURING
THE FIRST PART OF SATURDAY...WHILE THE 00Z ECMWF SHOWS A SLOWER
EASTWARD PROGRESSION OF THE FRONT...NOT MOVING IT COMPLETELY THROUGH
THE STATE UNTIL LATER SATURDAY. HIGH PRESSURE WILL THEN BUILD BACK
INTO THE REGION FOR THE LATTER HALF OF THE WEEKEND...USHERING IN A
MUCH COOLER AND DRIER AIR MASS.

TEMPERATURES WILL BE ABOVE SEASONAL NORMALS THROUGH THE END OF THE
WORK WEEK THANKS TO DEEP SOUTHERLY FLOW ON THE BACK SIDE OF HIGH
PRESSURE MOVING OFF THE NEW ENGLAND COAST. HIGHS WILL BE IN THE
UPPER 70S TO LOW 80S THURSDAY...WITH THE WARMEST DAY OF THE PERIOD
ON FRIDAY AS HIGHS TOP OUT IN THE LOWER TO MID 80S. EXPECT A WARM
NIGHT THURSDAY NIGHT WITH LOWS IN THE LOWER TO MID 60S. EXPECT LOWS
FRIDAY NIGHT TO BE A BIT COOLER AS THE COLD FRONT MOVES INTO THE
AREA WITH LOWS IN THE UPPER 50S TO LOWER 60S. HIGHS SATURDAY WILL
RETURN TO NEAR AVERAGE AS THE FRONT PASSES THROUGH THE REGION WITH
HIGHS GENERALLY IN THE LOWER TO MIDDLE 70S. A MUCH COOLER DRIER AND
AIRMASS WILL REALLY BEGIN TO FILTER INTO THE REGION SATURDAY NIGHT
AS LOWS DROP BACK INTO THE LOWER TO MID 50S...WITH HIGHS SUNDAY ONLY
REACHING UP INTO THE UPPER 60S TO AROUND 70.

&&

.AVIATION /15Z MONDAY THROUGH FRIDAY/...
AS OF 1455Z...REGIONAL SATELLITE IMAGERY AND SURFACE OBS SHOWS IFR
TO MVFR STRATUS STILL LINGERING ACROSS PORTIONS OF LAKE ONTARIO...
THE NORTH COUNTRY...AND THE WESTERN SOUTHERN TIER...WITH SOME
LINGERING MVFR CU/STRATOCU ALSO FOUND ACROSS PORTIONS OF THE
NIAGARA FRONTIER. ELSEWHERE...CONDITIONS ARE VFR WITH A MIX OF
PARTLY TO MOSTLY SUNNY SKIES AND SOME DEVELOPING DIURNAL CUMULUS.
THROUGH THE MIDDAY HOURS...STRENGTHENING HEATING/MIXING SHOULD HELP
TO MIX OUT ANY LINGERING IFR/MVFR CIGS...WHILE ALSO LEADING TO THE
CONTINUED DEVELOPMENT OF DIURNAL CU.

A FEW WIDELY SCATTERED SHOWERS AND STORMS MAY DEVELOP DURING THE
AFTERNOON AND EVENING MAINLY ACROSS WESTERN NY WITH LOCAL MVFR/IFR
IN ANY HEAVIER SHOWERS...BUT THE MAJORITY OF THE AREA WILL REMAIN
VFR. THE GREATEST CHANCES OF ANY CONVECTION WILL BE ALONG AND NEAR
A CONVERGENCE ZONE FROM NEAR KJHW TO KROC.

OUTLOOK...
TUESDAY...SHOWERS AND THUNDERSTORMS LIKELY WITH ASSOCIATED BRIEF
MVFR/IFR. SOME STORMS MAY BE STRONG.
WEDNESDAY AND THURSDAY...VFR.
FRIDAY...MAINLY VFR. A CHANCE OF SHOWERS AND THUNDERSTORMS WITH
ASSOCIATED BRIEF MVFR/IFR.

&&

.MARINE...
A WEAK PRESSURE GRADIENT WILL KEEP WINDS LIGHT ACROSS THE LOWER
LAKES TODAY WITH GOOD BOATING CONDITIONS ON BOTH LAKES. A COLD FRONT
WILL MOVE INTO THE CENTRAL LAKES TONIGHT THEN CROSS THE LOWER LAKES
ON TUESDAY. SOUTHWEST WINDS WILL INCREASE IN ADVANCE OF THIS FRONT
LATER TONIGHT...ESPECIALLY ON LAKE ERIE WHERE A BRIEF PERIOD OF
MODERATE WINDS WILL PRODUCE CHOPPY CONDITIONS LATE TONIGHT INTO
TUESDAY MORNING. FOR NOW HAVE HELD WINDS AND WAVES JUST SHY OF SMALL
CRAFT ADVISORY CRITERIA.

THE COLD FRONT WILL PRODUCE SCATTERED TO NUMEROUS THUNDERSTORMS ON
TUESDAY...A FEW OF WHICH MAY CONTAIN GUSTY WINDS. HIGH PRESSURE WILL
THEN BUILD INTO THE LOWER LAKES BEHIND THE COLD FRONT WITH A RETURN
TO LIGHT WINDS WEDNESDAY AND THURSDAY.

&&

.BUF WATCHES/WARNINGS/ADVISORIES...
NY...NONE.
MARINE...NONE.

&&

$$

SYNOPSIS...HITCHCOCK
NEAR TERM...HITCHCOCK/JJR
SHORT TERM...JM
LONG TERM...JM
AVIATION...HITCHCOCK/JJR
MARINE...HITCHCOCK






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