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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KBUF 241725
AFDBUF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BUFFALO NY
125 PM EDT FRI MAY 24 2013

.SYNOPSIS...
SHOWERS LINGERING BEHIND A DEPARTED COLD FRONT WILL TAPER OFF FROM
WEST TO EAST TODAY...BUT UNSEASONABLY COOL TEMPERATURES WILL BE THE
RULE. HIGH PRESSURE BUILDING ACROSS THE GREAT LAKES WILL BRING
MAINLY DRY AND COOL CONDITIONS THIS WEEKEND...BEFORE TEMPERATURES
WILL REBOUND BACK TO ABOVE AVERAGE NEXT WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
REGIONAL RADARS SHOWING BACK EDGE OF PRECIPITATION WORKING INTO THE
GENESEE VALLEY AND WESTERN FINGER LAKES...WITH NUMEROUS SHOWERS
CONTINUING ACROSS CENTRAL NEW YORK. THE PRECIPITATION WILL
CONTINUE TO WIND DOWN FROM WEST TO EAST...ALTHOUGH SOME DRIZZLE MAY
LINGER INTO THE AFTERNOON.

VISIBLE LOOP SHOWING EXPANSIVE AREA OF OVERCAST. IT MIGHT BE AWHILE
UNTIL WE SEE SOME CLEARING. THE BEST CHANCES FOR SOME LIMITED
SUNSHINE WILL BE ACROSS THE FAR WEST LATE IN THE DAY.

IT WILL BE QUITE CHILLY TODAY WITH TEMPERATURES EXPECTED TO RANGE
FROM THE MID 40S TO LOWER 50S...ALTHOUGH THESE MAY BE A BIT TOO WARM
IF DENSE OVERCAST PERSISTS THROUGH THE AFTERNOON. BRISK NORTHWEST
WINDS BEHIND THE DEPARTED COLD FRONT WILL PUT EVEN MORE A CHILL INTO
THE AIR.

TONIGHT...THE UPPER TROUGH IS FORECAST TO DEEPEN...THEN CLOSE OFF
OVER SOUTHEAST NY AND NEW ENGLAND. THE ASSOCIATED SURFACE LOW WILL
REMAIN IN PLACE JUST OFF THE SOUTHERN NEW ENGLAND COAST. THE MOIST
CYCLONIC FLOW ALONG THE WESTERN PERIPHERY OF THE LOW MAY GENERATE A
FEW MORE SHOWERS ACROSS PARTS OF THE NORTH COUNTRY OVERNIGHT.
FARTHER TO THE WEST...EXPECT TO SEE A SHARP EAST TO WEST DECREASE IN
CLOUDS. THE CLEARING SKIES AND ONGOING COLD AIR ADVECTION WILL ALLOW
TEMPERATURES TO COOL INTO THE UPPER 30S AND LOWER 40S...WITH MID 30S
POSSIBLE ACROSS PARTS OF THE SOUTHERN TIER. WITH TEMPERATURES
EXPECTED TO COOL INTO THE MID 30S...THE POSSIBILITY OF FROST EXISTS.
HOWEVER...STILL FEEL THAT THE NORTHWEST GRADIENT WIND WILL BE STRONG
ENOUGH TO PRECLUDE THE DEVELOPMENT OF FROST ACROSS MOST OF THE
SOUTHERN TIER.

&&

.SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/...
-- Changed Discussion --
OUR REGION WILL BE WEST OF AN UPPER LEVEL LOW WHICH IS FORECAST
TO STALL ACROSS NEW ENGLAND THIS WEEKEND. ALTHOUGH THE SPREAD IN
MODEL GUIDANCE HAS NARROWED...THERE IS STILL SOME UNCERTAINTY AS
TO HOW FAR WEST SHOWERS ASSOCIATED WITH THIS UPPER LOW WILL BE.

REGARDLESS OF MODEL DIFFERENCES...THERE CONTINUES TO BE HIGH CONFIDENCE
IN FAIR WEATHER AND LOTS OF SUNSHINE FOR THE WESTERN HALF OF THE
CWA...WHICH INCLUDES BUFFALO...ROCHESTER...AND THE SOUTHERN TIER.
THERE PROBABLY WILL BE SOME CLOUDS AND PERHAPS A SHOWER EAST OF
LAKE ONTARIO THROUGH SUNDAY...BEFORE THE UPPER LOW FINALLY DRIFTS
TO THE EAST SUNDAY NIGHT. THE FORECAST REPRESENTS A CONSENSUS OF
THE PAST TWO RUNS OF THE GFS/NAM/SREF/EUROPEAN/GGEM.

TEMPERATURES WILL CONTINUE TO BE ON THE COOL SIDE...BUT SHOULD
MODERATE A BIT ON SUNDAY. HIGHS WILL RANGE FROM THE UPPER 50S TO
LOWER 60S ON SATURDAY...AND SHOULD TOP OUT IN THE 60S ON SUNDAY.
GIVEN THE NORTHWESTERLY GRADIENT...EXPECT AN EARLY LAKE BREEZE SOUTH
OF LAKE ONTARIO. OVERNIGHT LOWS WILL ALSO BE CHILLY...WITH SOME
PATCHY FROST POSSIBLE IN THE VALLEYS OF THE SOUTHERN TIER WITH LOWS
IN THE MID TO UPPER 30S. A MODEST GRADIENT AND WARMING 850MB
TEMPERATURES SHOULD LIMIT FROST POTENTIAL ELSEWHERE...WITH LOWS
MAINLY IN THE LOWER 40S.
-- End Changed Discussion --

&&

.LONG TERM /MONDAY THROUGH THURSDAY/...
LATEST MEDIUM RANGE GUIDANCE SUGGESTS MAINLY DRY WEATHER THROUGH THE
PERIOD...ALONG WITH A GRADUAL WARMING TREND. MOST OF THIS PERIOD
WILL FEATURE AN UPPER LEVEL RIDGE OVER THE MISSISSIPPI VALLEY
BUILDING EASTWARD. A SURFACE HIGH WILL SET UP ALONG THE EAST
COAST...RESULTING IN THE DEVELOPMENT A WARMER SOUTHERLY FLOW OF AIR.

HAVE A HIGH CONFIDENCE IN DRY WEATHER FOR MONDAY AND MONDAY
NIGHT...WITH THE SURFACE HIGH LIKELY TO BE ACROSS OUR REGION. AFTER
THIS...A WEAK WARM FRONTAL BOUNDARY WILL EXTEND FROM THE UPPER
LAKES...SOUTHEASTWARD TO THE MID ATLANTIC COAST. THIS BOUNDARY IS
FORECAST TO GRADUALLY LIFT TOWARD OUR REGION THROUGH MID-WEEK. EXPECT
SCATTERED THUNDERSTORMS ALONG THIS BOUNDARY...BUT HAVE A LOW
CONFIDENCE IN TIMING WHEN IT WILL CROSS OUR REGION. THE 00Z GFS/GGEM
LIFT THE FRONT ACROSS OUR REGION WEDNESDAY...WITH THE EUROPEAN
NEARLY A DAY SLOWER. FOR NOW...WITH GO WITH A PERSISTENT SLIGHT
CHANCE FOR THUNDERSTORMS DURING THE PERIOD. THE PASSAGE OF THE FRONT
WILL ALSO KEY EVEN WARMER TEMPERATURES. HIGHS WILL LIKELY RISE INTO
THE LOWER 80S BY MID-WEEK...WITH TEMPERATURES POSSIBLY EVEN WARMER
IF THE EARLIER FRONTAL PASSAGE VERIFIES.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
-- Changed Discussion --
WIDESPREAD MVFR TO IFR CONDITIONS PREVAIL ACROSS THE AREA EARLY
THIS AFTERNOON AS PLENTY OF MOISTURE LINGERS BEHIND THE DEPARTED
COLD FRONT. THE SHOWERS WILL SLOWLY END FROM WEST TO EAST DURING
THE DAY AS THE UPPER LEVEL TROUGH MOVES SLOWLY EAST. IFR CIGS WILL
IMPROVE TO MVFR AS THE RAIN TAPERS OFF. LATER THIS AFTERNOON AND
DURING THE EVENING...CIGS SHOULD LIFT TO VFR...THEN SCATTER
OUT...ESPECIALLY ACROSS WESTERN NEW YORK. CLOUDS WILL CONTINUE TO
THIN OUT TONIGHT AS DRIER AIR WORKS IN FROM THE WEST. THE
EXCEPTION TO THIS GENERAL TREND WILL BE EAST OF LAKE ONTARIO WHERE
CLOUDS AND POSSIBLE SHOWERS WILL LINGER IN THE WAKE OF THE LOW
THAT WILL BE STATIONED OFF THE NEW ENGLAND COAST.

OUTLOOK...
SATURDAY THROUGH WEDNESDAY...VFR.
-- End Changed Discussion --

&&

.MARINE...
THE MODEST NORTHWEST FLOW BEHIND THE DEPARTED COLD FRONT WILL
MAINTAIN SMALL ADVISORY CONDITIONS ON THE LAKES THIS AFTERNOON.
LOW PRESSURE THAT WILL BE LIFTING UP THE NEW ENGLAND COAST WILL
MAINTAIN A NORTHWEST FLOW THROUGH THE WEEKEND...BUT WIND AND WAVES
ARE EXPECTED TO REMAIN JUST BELOW LEVELS NEEDED FOR A SCA.

&&

.BUF WATCHES/WARNINGS/ADVISORIES...
NY...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 4 PM EDT THIS AFTERNOON FOR LEZ020-
         040-041.
         SMALL CRAFT ADVISORY UNTIL 4 PM EDT THIS AFTERNOON
         FOR LOZ030-042>045.

&&

$$

SYNOPSIS...TJP
NEAR TERM...APFFEL/TJP/TMA
SHORT TERM...APFFEL
LONG TERM...APFFEL
AVIATION...TMA
MARINE...TJP