FXUS61 KOKX 261840
AFDOKX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW YORK NY
140 PM EST SAT DEC 26 2009
.SYNOPSIS...
LOW PRESSURE NEAR THE NORTH CAROLINA COAST WILL MOVE UP THE
EASTERN SEABOARD AND ACROSS THE LOCAL AREA TONIGHT. WEAK HIGH
PRESSURE RETURNS SUNDAY...AND IS REINFORCED BY A STRONG ARCTIC
COLD FRONT EARLY NEXT WEEK. COLD HIGH PRESSURE BUILD IN FOR THE
MID WEEK PERIOD. A STORM SYSTEM MAY IMPACT THE AREA LATE IN THE
WEEK.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
STACKED LOW PRES OVER THE UPPER MIDWEST...MOVES TOWARDS THE GREAT
LAKES TODAY. MODELS IN GOOD AGREEMENT WITH SECONDARY LOW PRES
TRACKING NNE UP THE EASTERN SEABOARD FROM NORTH CAROLINA TODAY.
COLD AIR DAMMING HAS WEAKEN IN THE LEE OF THE APPALACHIANS WITH
HIGH PRES LIFTING INTO THE CANADIAN MARITIME PROVINCES.
PRECIP WILL CONTINUE TO FILL IN FROM SOUTHWEST TO NORTHEAST
ACROSS THE REGION...WITH EASTERN CT AND THE TWIN FORKS BEING THE
LAST TO SEE THE RAIN. POPS REMAIN AT 100%. TIMING OF THE ARRIVAL
OF STEADY PCPN IS FOCUSED ON THE AFTERNOON WITH LIGHT RAIN FOR THE
AM OVER NYC METRO WHERE STEADY PCPN ARRIVES SHORTLY FROM NJ.
WITH TEMPS INTO THE 40S (NEAR 40 INLAND) AND THE STEADY
RAIN...EXPECT A LOT OF PONDING ON AREA ROADWAYS. WILL HANDLE THIS
WITH NOWCASTS. DON'T FORESEE AND NEED TO FLOOD ADVISORIES.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH MONDAY/...
LOW MOVES ACROSS THE LOCAL AREA TONIGHT WITH RAIN CONTINUING
OVERNIGHT. WINDS WILL WEAKEN AS IT MOVES ACROSS AND THE
COMBINATION OF SOMEWHAT WARMER TEMPS OVER A COLD SNOW
PACK...ABUNDANT LOW LEVEL MOISTURE AND LIGHT WINDS SHOULD ALLOW
AREAS OF FOG TO DEVELOP. RAIN TAPERS FROM WEST TO EAST SUN
MORNING WITH WEAK HIGH PRES BUILDING IN AND WINDS BECOMING
WESTERLY.
WINDS ALOFT INCREASE TO 40 TO 50 KT TODAY...BUT SFC INVERSION
SHOULD KEEP MOST OF THIS FROM MIXING TO THE SFC. GUSTS UP TO 40
MPH POSSIBLE..ESP ALONG THE COAST.
VIGOROUS SHORTWAVE APPROACHES SUN NIGHT/MON...BUT THERE ARE TIMING
DIFFERENCES AMONGST SHORT RANGE MODEL SOLUTIONS. GENERALLY
EXPECT SNOW SHOWERS INLAND...BUT TOUGH TO SAY IF IT WILL BE LIQUID
OR FROZEN PTYPE AT THE COAST. HAVE RAIN OR SNOW SHOWERS FOR NOW.
TEMPS ARE EXPECTED TO BE ABOVE NORMAL THROUGH THE DAY SUN...THEN
AT TO SLIGHTLY NORMAL BELOW NORMAL SUN NIGHT/MON.
&&
.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
DEEP TROUGHING OVER THE REGION TO START THE PERIOD WITH WELL BELOW
NORMAL TEMPS. ARCTIC COLD FRONT CROSSES THROUGH THE REGION MON NIGHT
IN WAKE OF INITIAL COLD FRONT WITH CLIPPER SYSTEM. WINDS MAY BRIEFLY
GUST CLOSE TO WIND ADVISORY WITH TEMPS FALLING INTO THE TEENS AND
LOWER 20S AREAWIDE. WIND CHILLS FALLING INTO THE LOWER SINGLE
DIGITS CITY/COAST AND SINGLE DIGITS BELOW ZERO INTERIOR. A FEW SNOW
SHOWERS POSSIBLE BEHIND THE ARCTIC FRONT.
WINDY AND COLD TEMPS TUES WITH TEMPS LIKELY NOT GETTING OUT OF THE
20S AREAWIDE.
HIGH PRESSURE BUILDS OVER THE REGION TUES NIGHT WITH GOOD
RADIATIONAL COOLING CONDS LIKELY.
SLOW MODERATION THROUGH MID WEEK AS UPPER FLOW BECOMES MORE ZONAL
AND HIGH PRESSURE SLIDES OFFSHORE...BUT STILL BELOW SEASONABLE. THEN
WILL HAVE TO KEEP AN EYE ON POSSIBLE PHASING OF NORTHERN AND
SOUTHERN STREAM ENERGY ACROSS THE CENTRAL US ON THURS...WHICH WOULD
HAVE IMPLICATIONS OF A POSSIBLE COASTAL STORM TO END THE WEEK.
&&
.AVIATION /19Z SATURDAY THROUGH THURSDAY/...
LOW PRESSURE APPROACHING NY METRO AREA. STRONG EAST FLOW
PREVAILS AHEAD OF LOW. DIRECTIONS REMAIN FAIRLY CONSISTENT BEFORE
BACKING THROUGH NE TO NW. DIRECTIONS MAY BECOME ERRATIC ESPECIALLY
NEAR THE LOW CENTER.
THIS AFTERNOON...EXPECT BUMPY CONDITIONS AT ALL AIRPORTS BELOW FL050 DUE TO
GUSTY WINDS. CONDITIONS DO NOT MEET LLWS CRITERIA SO NO MENTION IN
TAFS...BUT EXPECT MANY PIREPS WITH MENTION OF GAIN/LOSS IN SPEED.
PERIOD OF LIGHT WINDS MAY ALLOW FOR FOG DEVELOPMENT...WHICH MAY BE
DENSE SUN AM. SUBSEQUENT TAFS MAY NEED A MENTION OF LIFR/VLIFR FOR
A FEW HOURS BETWEEN 06-12Z SUNDAY.
OUTLOOK 18Z SUNDAY THROUGH WEDNESDAY...
SUNDAY...VFR.
MONDAY...GNLY VFR...SUB-VFR AT TIMES IN SNOWSHOWERS.
TUES-WED...VFR WITH STRONG NW WINDS.
&&
.MARINE...
WATERS REMAIN BETWEEN DEPARTING HIGH PRESSURE TO THE NORTHEAST AND
LOW PRESSURE RIDING ALONG MID ATLANTIC COAST TOWARD THE WATERS. A
TIGHT PRESSURE GRADIENT RESULTS...WITH GALE CONDITIONS ACROSS THE
WATERS EXCEPT PERHAPS NY HARBOR AND WESTERN LI SOUND. THE LOW
TRAVERSES ACROSS THE WATERS TONIGHT...ALLOWING WINDS TO ABATE. THEN
WINDS SHIFT TO THE WEST SUNDAY BEHIND THE LOW/FRONT. A SERIES OF
WEAK TROUGHS MOVE ACROSS THE WATERS THROUGH MONDAY...BUT AN ARCTIC
FRONT MONDAY NIGHT WILL USHER IN NORTHWEST GALES TUESDAY...ALONG
WITH VERY COLD TEMPERATURES. WINDS GRADUALLY DIMINISH WEDNESDAY AS A
RIDGE OF HIGH PRESSURE BUILDS. NEED TO KEEP AN EYE ON POTENTIAL CSTL
STORM THEREAFTER.
FOLLOWED WAVE WATCH III SEA FORECASTS CLOSELY. EXPECT ROUGH
CONDITIONS OUT ACROSS THE WATERS TODAY IN STRONG EAST FLOW. SEAS
REMAIN ROUGH FOR QUITE SOME TIME...BUT SOME IMPROVEMENT EXPECTED
INTO MONDAY. NW GALES KEEP SEAS RATHER ROUGH TUESDAY...THEN SEAS
SHOULD SUBSIDE WEDNESDAY WITH THE APPROACH OF HIGH PRESSURE.
&&
.HYDROLOGY...
STILL EXPECTING AROUND AN INCH OF QPF ON AVERAGE ACROSS THE LOCAL
AREA THROUGH SUN MORNING. THE HIGHER QPF VALUES (JUST OVER AN
INCH) ARE EXPECTED TO FALL ACROSS WESTERN AREAS WHERE THERE IS
LESS SNOW PACK/WATER EQUIVALENT QPF. AROUND 2 INCH WATER
EQUIVALENT QPF REMAINS IN THE SNOW PACK ACROSS EASTERN
AREAS...WHERE BETWEEN 3/4 AND 1 INCH OF RAINFALL IS EXPECTED TO
FALL. THE COMBINATION OF THE SNOW PACK AND RAINFALL WILL LIKELY
LEAD TO MINOR NUISANCE URBAN FLOODING. RIVER AND STREAM FLOODING
NORTH AND WEST OF NYC IS LESS LIKELY TO OCCUR DUE TO LESS OF A
SNOW PACK.
&&
.OKX WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
NY...NONE.
NJ...NONE.
MARINE...GALE WARNING UNTIL 6 PM EST THIS EVENING FOR ANZ335-338-345-
355.
GALE WARNING UNTIL MIDNIGHT EST TONIGHT FOR ANZ330-340-350-353.
&&
$$
SYNOPSIS...
NEAR TERM...JST
AVIATION...BS
