Area Forecast Discussion
Issued by NWS Buffalo, NY

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716 FXUS61 KBUF 141159 AFDBUF AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BUFFALO NY 659 AM EST SUN FEB 14 2016 .SYNOPSIS... THE COLDEST AIRMASS OF THE SEASON WILL REMAIN IN PLACE TODAY. WIDESPREAD MAINLY LIGHT LAKE EFFECT SNOW SHOWERS SOUTHEAST OF THE LAKES THIS MORNING WILL DIMINISHING BY THIS AFTERNOON. TEMPERATURES WILL RETURN TO NEAR AVERAGE EARLY NEXT WEEK WITH A PAIR OF SYSTEMS POSSIBLY BRINGING SOME LIGHT SNOW OR RAIN TO THE REGION MONDAY THROUGH WEDNESDAY. && .NEAR TERM /THROUGH TONIGHT/... STRONG ARCTIC HIGH PRESSURE WILL SETTLE DOWN ACROSS WESTERN AND NORTH CENTRAL NEW YORK TODAY. WIDESPREAD NORTHWEST FLOW LAKE EFFECT SNOW SHOWERS CONTINUE TO SPRAY THE SOUTH SHORE OF LAKE ONTARIO. LESSER ACTIVITY STREAMING OFF LAKE ERIE SOUTH OF BUFFALO. SNOWFALL HAS BEEN GENERALLY LIGHT...AND CONTINUES TO SHOW A GRADUAL DECREASE IN INTENSITY IN RESPONSE TO STRENGTHENING SUBSIDENCE AND DRYING LOW LEVELS. ONLY LIGHT ADDITIONAL ACCUMULATIONS ARE EXPECTED ALONG LAKESHORE AREAS THIS MORNING...THEREFORE ADVISORY HEADLINES HAVE BEEN DROPPED. BITTERLY COLD REGIONAL TEMPERATURES THIS MORNING IN THE NEGATIVE SINGLE DIGITS AND NEGATIVE TEENS TO EVEN AS COLD AS NEAR 35 BELOW AT WATERTOWN. WIND SPEEDS ARE CONTINUING TO DIMINISH BUT STILL REMAIN ELEVATED JUST ENOUGH TO WARRANT THE CONTINUATION OF THE WIND CHILL WARNING FOR AREAS EAST OF ROCHESTER THIS MORNING. THE CORE OF THE COLDEST AIR STARTS TO RETREAT BY THIS AFTERNOON...SO IT WILL NOT BE QUITE AS BITTER AS SATURDAY. EXPECT HIGHS GETTING JUST ABOVE ZERO AROUND THE NORTH COUNTY AND PERHAPS NEAR 10 ABOVE ACROSS WESTERN NEW YORK. && .SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/... TWO SHORTWAVES SEEN ON WATER VAPOR IMAGERY THIS EARLY SUNDAY MORNING WILL BRING CHANCES FOR PRECIPITATION OVER THE MONDAY AND TUESDAY TIMEFRAME. THIS FIRST WAVE...OVER NE/SD THIS EARLY SUNDAY MORNING WILL SPREAD LIGHT SNOW ACROSS THE REGION MONDAY AND MONDAY NIGHT AS IT PASSES BY. THERMAL PROFILES ARE IN EXCELLENT AGREEMENT THAT ANY PRECIPITATION THAT FALLS WILL BE IN THE FORM OF SNOW. BY MONDAY NIGHT THERE IS A LITTLE UNCERTAINTY CREEPING INTO THE FORECAST AS THE TOP OF THE MOISTURE LAYER IS STRIPPED FROM THE SNOW DENDRITIC GROWTH ZONE. THERE WILL A LOW CHANCE FOR SOME FREEZING DRIZZLE LATE MONDAY NIGHT. THE SECOND WAVE...OVER SOUTHERN ALBERTA THIS SUNDAY MORNING WILL DROP ACROSS THE ROCKIES SUNDAY...WHERE IT WILL THEN PICK UP A SURFACE LOW FORMING OVER THE DEEP SOUTH. THIS SHORTWAVE WILL THEN DEEPEN THE SURFACE LOW AS THE LOW TRACKS TOWARDS THE APPALACHIANS. HERE IS WHERE UNCERTAINTY INCREASES. AS THE SHORTWAVE CROSSES THE APPALACHIANS...IT MAY FORM A SECONDARY AREA OF LOW PRESSURE NEAR THE DELMARVA PENINSULA TUESDAY AS PER THE 00Z ECMWF. THE 00Z GFS TRACKS DEEPENS THE SURFACE LOW TO THE WEST OF THE APPALACHIANS. ALSO THERE IS MUCH UNCERTAINTY AS TO HOW MUCH WARM AIR PUSHES NORTHWARD INTO OUR REGION TUESDAY. LATEST SREF ENSEMBLE MEMBERS ARE NEARLY SPLIT AS TO THE P-TYPE...WHETHER PLAIN RAIN OR SNOW. FOR NOW WILL LEAN TOWARDS MORE SNOW THAN RAIN...ON ACCOUNT FOR DYNAMIC COOLING ASSOCIATED WITH A BAND OF PRECIPITATION FORMING ALONG A DECENT 850 HPA FRONTOGENETIC ZONE. BOTH THE GFS AND ECMWF SUGGEST THAT THIS FRONTOGENETIC BAND WILL FORM IN THE VICINITY OF THE GENESEE VALLEY AND NORTHERN FINGER LAKES REGION. GIVEN THE UNCERTAINTY TO THE TRACK...THERMAL PROFILES AND WHERE A HEAVIER BAND OF PRECIPITATION MAY MATERIALIZE...WITH THE MONDAY NIGHT AND TUESDAY STORM SYSTEM WILL MENTION FOR NOW THE POSSIBILITY FOR ACCUMULATING SNOW IN THE HWO PRODUCT. TUESDAY NIGHT BEHIND THE SURFACE LOW...MOISTURE WRAPPING BACK AROUND THE EASTERN GREAT LAKES REGION WITHIN A COLD AIR ADVECTION REGIME MAY BRING CHANCES FOR LIGHT SNOW THROUGH THE NIGHT. TEMPERATURE READINGS MONDAY WILL CLIMB TO NEAR THE FREEZING MARK...WHILE ON TUESDAY THE AIRMASS WILL WARM TO A FEW DEGREES ABOVE FREEZING. && .LONG TERM /WEDNESDAY THROUGH SATURDAY/... TRAILING THE TUESDAY STORM...LINGERING TROUGHINESS WILL KEEP CHANCES FOR WINTER WEATHER IN PLACE MIDWEEK THEN A WAVY ZONAL PACIFIC MID- LEVEL FLOW LOOKS TO SET UP ACROSS THE CONUS LATE IN THE WEEK. THIS PACIFIC FLOW WILL EVENTUALLY SEAL OFF ANY ARCTIC AIR TO THE NORTH WITH TEMPERATURES THEN WARMING TO ABOVE NORMAL. ON WEDNESDAY...A TRAILING WEAK CLIPPER OR SURFACE TROUGH LOOKS TO CROSS THE GREAT LAKES BRINGING A BRIEF SHOT OF COLDER AIR AND CHANCES FOR SOME LIGHT SNOW SHOWERS. THERE MAY EVEN BE SOME LAKE ENHANCEMENT SOUTHEAST OF THE LAKES INTO WEDNESDAY NIGHT AS LAKE INDUCED EQUILIBRIUM LEVELS BRIEFLY CLIMB TO BETWEEN 5 AND 10KFT. DRY CONDITIONS ARE EXPECTED THURSDAY FOLLOWED BY A RETURN TO ABOVE NORMAL TEMPERATURES LATE IN THE WEEK AS LOW PRESSURE TRACKS ACROSS THE GREAT LAKES. THIS LATTER SYSTEM WILL ALSO BRING RENEWED PRECIPITATION CHANCES TO OUR REGION...WITH ANY PRECIP LIKELY CHANGING OVER FROM SNOW TO RAIN AS THE ATMOSPHERIC COLUMN WARMS ON FRIDAY AND FRIDAY NIGHT FOLLOWED BY AN CHANGEOVER BACK TO CHANCES OF SNOW SATURDAY WITH COOLER FLOW IN THE WAKE OF THE LOW. && .AVIATION /12Z SUNDAY THROUGH THURSDAY/... LAKE EFFECT SNOW WILL DIMINISH SOUTHEAST OF LAKE ERIE AND AT THE WEST END OF LAKE ONTARIO WITH CONDITIONS SLOWLY IMPROVING TO MVFR AND THEN VFR. LAKE EFFECT SNOW WILL PERSIST LONGER SOUTHEAST OF LAKE ONTARIO...WITH AREAS OF IFR THROUGH MIDDAY SUNDAY FROM JUST EAST OF KROC TO KFZY. THIS TOO WILL SLOWLY END SUNDAY AFTERNOON WITH IMPROVEMENT TO MVFR AND EVENTUALLY VFR. OUTLOOK... MONDAY...VFR/MVFR WITH A CHANCE OF LIGHT SNOW. MONDAY NIGHT AND TUESDAY...MVFR/IFR WITH SNOW LIKELY POSSIBLY MIXED WITH RAIN IN THE AFTERNOON. WEDNESDAY...MVFR/IFR WITH A CHANCE OF SNOW. THURSDAY...MAINLY VFR. && .MARINE... HIGH PRESSURE WILL CONTINUE TO BUILD OVER THE LOWER LAKES AND BRINGS DIMINISHING WINDS DURING THE DAY TODAY. LINGERING SMALL CRAFT CONDITION ON EASTERN LAKE ONTARIO EARLY THIS MORNING WILL IMPROVE BY MIDDAY. LIGHT AND VARIABLE WINDS THIS AFTERNOON WILL TURN OUT OF THE SOUTHEAST TONIGHT THEN SOUTHERLY MONDAY. A LOW CROSSING THE AREA TUESDAY WILL SHIFT THE WINDS TO THE WEST OR NORTHWEST BUT WINDS SPEEDS SHOULD STAY UNDER 20 KNOTS. && .CLIMATE... AN ARCTIC AIRMASS WILL BE DROPPING ACROSS OUR REGION...WITH NEAR RECORD BREAKING COLD LASTING THROUGH THE WEEKEND. BELOW ARE SOME CLIMATE STATS AND RECORDS REGARDING THIS WEEKEND. BUFFALO: COLDEST TEMPERATURES LAST WINTER: -10F FEBRUARY 15TH AND 16TH RECORD LOW SATURDAY FEBRUARY 13TH: -9F 1914 RECORD LOW SUNDAY FEBRUARY 14TH: -13F 1943 RECORD LOW MAXIMUM SATURDAY FEBRUARY 13TH: 5F 1899 RECORD LOW MAXIMUM SUNDAY FEBRUARY 14TH: 5F 1979 ROCHESTER: COLDEST TEMPERATURES LAST WINTER: -11F FEBRUARY 20TH AND 21ST RECORD LOW SATURDAY FEBRUARY 13TH: -12F 1979 RECORD LOW SUNDAY FEBRUARY 14TH: -14F 1979 RECORD LOW MAXIMUM SATURDAY FEBRUARY 13TH: 9F 1979 RECORD LOW MAXIMUM SUNDAY FEBRUARY 14TH: 6F 1979 WATERTOWN: COLDEST TEMPERATURES LAST WINTER: -36F FEBRUARY 16TH RECORD LOW SATURDAY FEBRUARY 13TH: -28F 1979 RECORD LOW SUNDAY FEBRUARY 14TH: -30F 1979 RECORD LOW MAXIMUM SATURDAY FEBRUARY 13TH: 1F 1979 RECORD LOW MAXIMUM SUNDAY FEBRUARY 14TH: -1F 1979 && .BUF WATCHES/WARNINGS/ADVISORIES... NY...WIND CHILL WARNING UNTIL 10 AM EST THIS MORNING FOR NYZ003>008- 021. MARINE...NONE. && $$ SYNOPSIS...TMA NEAR TERM...TMA SHORT TERM...THOMAS LONG TERM...SMITH AVIATION...TMA MARINE...TMA CLIMATE...THOMAS

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