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Area Forecast Discussion
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000
FXUS61 KBUF 201152
AFDBUF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BUFFALO NY
752 AM EDT MON OCT 20 2014

.SYNOPSIS...
CLOUDS WILL HANG IN ALL DAY TODAY WITH INCREASING CHANCES OF RAIN 
SHOWERS AHEAD OF LOW PRESSURE MOVING EAST ACROSS THE GREAT LAKES. 
COOL TEMPERATURES AND SHOWERY WEATHER WILL PERSIST THROUGH MUCH OF 
THE COMING WEEK AS THIS SYSTEM SLOWLY CROSSES THE LOWER GREAT LAKES.

&&

.NEAR TERM /THROUGH TONIGHT/...
MID-LEVEL CLOUDS ARE STREAMING ACROSS UPSTATE NEW YORK AHEAD OF AN 
AREA OF LOW PRESSURE SHIFTING ACROSS THE UPPER PENINSULA OF MICHIGAN 
THIS MORNING. JUST A FEW AREAS OF VIRGA SHOWING UP ON RADAR WITH 
SHOWERS NOT REACHING THE SURFACE UNTIL YOU LOOK BACK WEST OF THE 
NIAGARA PENINSULA. A CLIPPER TYPE LOW PRESSURE SYSTEM WILL TRACK 
FROM THE MICHIGAN U.P. EAST TO JUST SOUTH OF GEORGIAN BAY INTO THIS 
EVENING. MOISTURE TRANSPORT AHEAD OF THIS SYSTEM WILL INCREASE 
THROUGH THE FIRST HALF OF THE DAY AND LOW LEVELS WILL TAKE SOME TIME 
TO SATURATE AS PLENTY OF DRY AIR IS PRESENT 5-10KFT PER 12Z KBUF 
SOUNDING. HAVE SPED UP TIMING OF SHOWERS TO COVER FOR THE CURRENT 
RETURNS TO OUR WEST BUT MOST OF THIS SHOULD DRY UP/WEAKEN BEFORE 
REACHING WESTERN NEW YORK. 

THE BEST CHANCES FOR SHOWER ACTIVITY WILL BE HELD TO THE AFTERNOON 
AND INTO THE EVENING HOURS. THIS TIMING FOLLOWS SHORT TERM GUIDANCE 
SUCH AS NAM/SPC SSEO/HRRR MODELS WHICH GENERALLY SHIFT THIS MORNINGS 
SHOWERS TO THE NORTH OF LAKE ONTARIO UNTIL THE LOWER LEVEL SATURATE 
THIS AFTERNOON AND ANOTHER SLUG OF MOISTURE LIFTS OUT OF THE OHIO VALLEY. 
DESPITE THE CLOUD COVER...ASSOCIATED WARM AIR ADVECTION WILL HELP TO 
BOOST TEMPERATURES TODAY INTO THE MID 50S.

TONIGHT THE SURFACE LOW DEEPENS WHILE THE UPPER TROUGH OVER THE 
GREAT LAKES SHARPENS. THE SURFACE LOW WILL CENTER OVER THE NIAGARA 
FRONTIER BY 12Z TUESDAY. BUFKIT PROFILES SHOW A FEW TIME SECTIONS 
WHERE SYNOPTIC LIFT WILL BE ELEVATED SO SOME PERIODS OF MODERATE 
INTENSITY SHOWERS MAY WORK OVER WESTERN AND NORTH-CENTRAL NEW YORK 
OVERNIGHT. QPF THROUGH 12Z WILL AVERAGE AROUND A THIRD OF AN INCH 
ACROSS WESTERN NEW YORK WITH A TENTH OR TWO POSSIBLE TOWARD CENTRAL 
NEW YORK. THE SOUTHERLY FLOW AND CLOUD COVER WILL KEEP OVERNIGHT 
LOWS LIMITED TO THE MID 40S.

&&

.SHORT TERM /TUESDAY THROUGH THURSDAY NIGHT/...
AN UPPER LEVEL LOW WITH ATTENDANT SURFACE REFLECTION WILL BE 
CENTERED OVER WESTERN NEW YORK AS WE OPEN THE PERIOD. AS THE LOW 
MOVES ACROSS THE AREA ON TUESDAY...EXPECT SHOWERS TO BE WIDESPREAD 
ACROSS WESTERN AND NORTH-CENTRAL NEW YORK. NORTHERLY FLOW WILL 
DEVELOP ACROSS THE FORECAST AREA AS THE LOW SLIDES OFF TO THE 
SOUTHEAST AND BY TUESDAY EVENING THIS UPSLOPE NORTHERLY FLOW OFF OF 
THE LAKES IN CONJUNCTION WITH WEAK SYNOPTIC LIFT AND COOL 
TEMPERATURES ALOFT ALONG WITH ATLANTIC MOISTURE WRAPPING BACK ACROSS 
THE REGION WILL AID IN A TRANSITION FROM SHOWERS OVER TO A MORE 
STRATIFORM REGIME OF LOW CLOUDS AND LIGHT RAIN OR POSSIBLY EVEN 
DRIZZLE THAT WILL ENCOMPASS MUCH OF THE AREAS SOUTH OF LAKES ERIE 
AND ONTARIO.

THE RATHER CLOUDY GLOOMY CONDITIONS WILL PERSIST THROUGH THE MIDDLE 
OF THE WEEK AS THE SLOW-MOVING UPPER LOW PRESSURE SYSTEM MEANDERS 
OFF THE NEW ENGLAND COAST...MAINTAINING COOL NORTHERLY FLOW OFF THE 
LAKES. HOWEVER WE SHOULD SEE PRECIPITATION TAPER OFF 
FROM WEST TO EAST ON WEDNESDAY AS THE MID/UPPER LEVEL CIRCULATION 
DRIFTS OFF THE EAST COAST AND DRY AIR ALOFT ENCROACHES ACROSS THE 
LOWER GREAT LAKES FROM THE WEST. THAT SAID...THERE WILL STILL BE 
PLENTY OF CLOUDS TO BE HAD ON WEDNESDAY... AND INDEED BY THURSDAY 
THE CHANCES FOR LIGHT RAIN WILL INCREASE ONCE AGAIN...PARTICULARLY 
EAST OF THE GENESEE VALLEY...AS THE LOW DRIFTS TOWARDS SOUTHERN NEW 
ENGLAND AND A FRESH SHOT OF ATLANTIC MOISTURE GETS SHUNTED TOWARDS 
THE LOWER GREAT LAKES.

WITH COOL NORTHERLY FLOW AND ABUNDANT MOISTURE PRODUCING PLENTY OF 
CLOUD COVER...TEMPERATURES WILL RUN ON THE COOL SIDE OF AVERAGE 
THROUGHOUT THE PERIOD WITH HIGHS RUNNING IN THE 50S TUESDAY. COOLER 
AIR WRAPPING AROUND THE BACK SIDE OF THE DEPARTING LOW SHOULD YIELD 
CHILLIER READINGS IN THE UPPER 40S TO LOWER 50S WEDNESDAY...HOWEVER 
BY THURSDAY WE RETURN TO THE 50S AS COMPARATIVELY MILDER MOIST 
ATLANTIC AIR MOVES BACK ACROSS THE REGION. LOWS WILL REFLECT THIS 
PATTERN WITH 40S TUESDAY NIGHT AND THURSDAY NIGHT WHILE WEDNESDAY 
WILL BE THE COOLEST NIGHT OF THE PERIOD WITH UPPER 30S ACROSS 
HIGHER ELEVATIONS AND LOWER 40S ON THE LAKE PLAINS.

&&

.LONG TERM /FRIDAY THROUGH SUNDAY/...
THE CLOUDY AND DRIZZLY WEATHER WILL CONTINUE THROUGH THE END OF THE 
WEEK AS LOW PRESSURE OFF THE NEW ENGLAND COAST TRACKS NORTH INTO THE 
GULF OF MAINE AND ATLANTIC MOISTURE CONTINUES TO WRAP ACROSS LAKE 
ONTARIO FROM THE NORTH. THE DEEPER MOISTURE AND THUS THE HIGHER RAIN 
CHANCES CURRENTLY APPEAR TO BE FOCUSED EAST OF THE GENESEE 
VALLEY...NONETHELESS UNDER NORTHERLY FLOW EXPECT CLOUDS AND AT LEAST 
A SLIGHT CHANCE OF RAIN ALL THE WAY TO THE PA BORDER. WE SHOULD THEN 
SEE GRADUAL IMPROVEMENT SATURDAY AS THE LOW FINALLY LIFTS OFF TO THE 
NORTHEAST ACROSS THE CANADIAN MARITIMES AND SHORTWAVE RIDGING MOVES 
ACROSS THE LOWER GREAT LAKES WITH SUNSHINE AND MILD TEMPERATURES 
RETURNING TO THE UPPER 50S/LOWER 60S. 

BY SUNDAY...HIGH PRESSURE WILL BE MOVING ACROSS THE REGION AHEAD OF 
A BROAD AND PROGRESSIVE UPPER LEVEL RIDGE OVER THE CENTRAL U.S. 
WHILE GLOBAL MODELS ARE IN GOOD AGREEMENT REGARDING THE GENERAL 
POSITION AND TIMING OF THE RIDGE...THERE ARE DIFFERENCES REGARDING A 
SHORTWAVE THAT WILL BE DROPPING OUT OF THE CANADIAN ARCTIC INTO 
QUEBEC WITH THE ECMWF BRINGING THIS FEATURE JUST FAR ENOUGH SOUTH TO 
SPREAD ARCTIC AIR ACROSS WESTERN AND NORTHERN NEW YORK. ON THE OTHER 
HAND...THE GFS KEEPS THE RIDGE FAR ENOUGH NORTH TO KEEP MILDER AIR 
IN PLACE ACROSS THE REGION. FOR NOW WILL CONTINUE WITH A COMPROMISE 
IN THE TEMPERATURE FORECAST THAT KEEPS READINGS JUST A HAR BELOW AVERAGE 
FOR SUNDAY WITH HIGHS IN THE LOW TO MID 50S.

&&

.AVIATION /12Z MONDAY THROUGH FRIDAY/...
VFR CONDITIONS WILL PREVAIL THROUGH MUCH OF TODAY WITH MID LEVEL 
CIGS GRADUALLY LOWERING INTO THIS AFTERNOON. SOME SHOWERS MAY DRIFT 
ACROSS WNY THIS MORNING BUT THE BULK OF SHOWERS AND MVFR CIGS SHOULD 
HOLD OFF UNTIL AFTER 00Z. IFR CIGS ARE POSSIBLE OVERNIGHT ACROSS 
WESTERN NEW YORK WITH LIGHT TO AT TIMES MODERATE SHOWERS. MVFR FOR 
KART.

OUTLOOK...   
MONDAY NIGHT AND TUESDAY...MVFR/IFR WITH RAIN LIKELY.
WEDNESDAY THROUGH FRIDAY...MVFR/VFR WITH A CHANCE OF RAIN.

&&

.MARINE...
SOUTH TO SOUTHWEST FLOW IN PLACE THIS MORNING AHEAD OF A SURFACE LOW 
CROSSING THE MICHIGAN UPPER PENINSULA. THIS LOW WILL APPROACH LAKE 
ONTARIO THROUGH TODAY WITH WINDS AND WAVES ACROSS THE EASTERN END OF 
LAKE ERIE PUSHING INTO SMALL CRAFT ADVISORY LEVELS. WINDS WILL 
SUBSIDE LATER TONIGHT AS SHOWERS MOVE IN AND THE CENTER OF THE LOW 
SHIFTS OVERHEAD. SMALL CRAFT CONDITIONS MAY REDEVELOP LATER TUESDAY 
AS THE LOW PASSES SOUTH OF LAKE ONTARIO AND NORTHERLY ONSHORE FLOW 
DEVELOPS ACROSS THE LOWER LAKES.

&&

.BUF WATCHES/WARNINGS/ADVISORIES...
NY...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR LEZ040-
         041.

&&

$$

SYNOPSIS...SMITH
NEAR TERM...SMITH
SHORT TERM...WOOD
LONG TERM...WOOD
AVIATION...SMITH
MARINE...SMITH







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