FXUS61 KOKX 282020
AFDOKX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW YORK NY
320 PM EST SAT NOV 28 2009
.SYNOPSIS...
DEEP LOW PRESSURE OVER THE MARITIMES WILL TRACK INTO THE NORTH
ATLANTIC THROUGH SUNDAY. A COLD FRONT ON MONDAY WILL USHER IN HIGH
PRESSURE FOR TUESDAY AND WEDNESDAY. A LOW PRESSURE SYSTEM ON
THURSDAY WILL DRAW A MUCH COLDER AIRMASS INTO THE REGION FOR THE
END OF THE WEEK.
&&
.NEAR TERM /UNTIL MIDNIGHT TONIGHT/...
AT 19Z ALL OBS EXCEPT FOR KJFK WERE BLW WIND ADVY CRITERIA. KJFK
WAS REACHING THE SUSTAINED THRESHOLD OF 27KT. WITH THE PRES GRAD
MAG DECREASING AND SUNSET APPROACHING LIMITING THE MIXING
POTENTIAL...WILL ALLOW THE ADVY TO EXPIRE AT 4PM.
THE 970S LOW OVER THE MARITIMES WILL SLOWLY TRACK NEWD INTO THE N
ATLANTIC TNGT. STLT IS MOCLR EXCEPT FOR BKN SKIES ACROSS ORANGE
COUNTY. WITH LOSS OF DIURNAL HEATING EXPECTING SKIES TO CLR ACROSS
THE NW WITH ALL AREAS MOCLR BY MIDNIGHT.
&&
.SHORT TERM /MIDNIGHT TONIGHT THROUGH TUESDAY/...
ALTHO THE ATM IS NOT FCST TO COMPLETELY DECOUPLE...TEMPS
WILL STILL FALL INTO THE 30S...WHICH ALLOWS FOR A DROP OF 15
DEGREES OR SO FROM TODAY/S HIGHS. IF AREAS SUCH AS KFOK/KDXR/KSWF
AND OTHER LOW LYING SPOTS COMPLETELY DECOUPLE...EXPECT LOWS TO
DROP AT LEAST 5 DEGREES COLDER THAN FCST.
HIGH PRES S OF THE CWA WILL ALLOW FOR MOSUNNY SKIES ON SUN. WSW
WINDS OF AROUND 10-15 KT COASTS. THIS FLOW WILL ALLOW FOR HIGHS OF
AT LEAST 5 DEGREES ABV CLIMO. HIGH CLOUDS INCREASE BY EVE AS FLOW
ALOFT BACKS AND MOISTURE IS DRAWN NEWD FROM THE SE CONUS.
H5 SHRTWV CURRENTLY TRACKING THRU CNTRL CANADA WILL SWEEP A CDFNT
THRU THE CWA ON MON. THIS WILL PRODUCE A BAND OF SHRA. ATTM IT
APPEARS LATE MRNG INTO THE AFTN IN THE WINDOW FOR RA. MILD AMS
WILL KEEP TEMPS ABV CLIMO WITH CLDY SKIES.
SKIES WILL CLEAR MON NGT BEHIND THE FRONT...HOWEVER LAKE STRATUS
WILL BUILD IN WITH THE COLD AIR OVERNIGHT. AMOUNT OF STRATUS WILL
DETERMINE HOW MUCH LOWS ARE LIMITED. FOR NOW FCST IS 20S AND 30S
WHICH IS CLOSE TO NORMAL. IF THE CLOUD SHIELD DOES NOT EXTEND INTO
THE CWA...COLDER TEMPS CAN BE EXPECTED.
ISOLD -SHRA POSSIBLE ACROSS THE NW TUE AFTN WITH LAKE ENHANCED
MOISTURE AND COLD POOL ALOFT. CHANCES ARE LIMITIED ATTM AND SIG
PCPN IS NOT EXPECTED. HIGH TEMPS WILL NOT REACH CLIMO AS H85
WILL BE AROUND -7C. IF THE SHRA DO DEVELOP ACROSS THE NW...ENOUGH
EVAP COOLING COULD RESULT IN -SHSN.
&&
.LONG TERM /TUESDAY NIGHT THROUGH FRIDAY/...
DRY WEATHER EXPECTED TO START THE LONG TERM PERIOD AS HIGH PRESSURE
WILL BE OVER THE REGION.
AN AREA OF LOW PRESSURE IS EXPECTED TO MOVE ACROSS THE TRI-STATE
AREA WEDNESDAY NIGHT THROUGH THURSDAY. THE TRACK OF THIS LOW WILL
DEPEND ON JUST HOW WARM TEMPERATURES ARE THROUGH THIS TIME PERIOD.
12Z GFS HAS A MORE INLAND TRACK WITH THE LOW PASSING WEST OF NY
CITY. MEANWHILE...THE 12Z ECMWF HAS A TRACK EAST OF NY CITY. EITHER
WAY...TEMPERATURES SHOULD BE WARM ENOUGH FOR ALL LIQUID TO OCCUR
WITH THIS EVENT. IF THIS LOW PASSES FURTHER EAST...THERE COULD BE
SOME SNOW SHOWERS ACROSS THE HIGHER ELEVATIONS OF THE LOWER HUDSON
VALLEY LATE THURSDAY ON THE BACK END OF THIS SYSTEM.
DRIER WEATHER RETURNS FOR FRIDAY AND SATURDAY AS THE SYSTEM DEPARTS.
TEMPERATURES THROUGH THIS PERIOD ARE EXPECTED TO BE AT OR SLIGHTLY
ABOVE NORMAL WEDNESDAY AND THURSDAY...AND SLIGHTLY BELOW NORMAL
FRIDAY AND SATURDAY.
&&
.AVIATION /20Z SATURDAY THROUGH THURSDAY/...
VFR WEATHER CONDITIONS WILL PERSIST THROUGH SUNDAY NIGHT.
STRONG W-NW WINDS WILL SLOWLY DECREASE FROM W TO E WITH THE APPROACH
OF SUNSET. WIND DIRECTIONS MAINLY 290-310 DEGS AT 20-25 KT WITH
GUSTS 30-40 KT WILL SLOWLY BACK TO 270-290 DEGS AT 10-15 KT WITH
NO GUSTS AFT 00Z. LLWS IS POSSIBLE UNTIL 21Z. WIND SPEEDS WILL
DECREASE TO LESS THAN 10 KT AROUND MIDNIGHT.
AS HIGH PRES MOVES OFF THE COAST SUNDAY...WINDS WILL BECOME SW
AROUND 10 KT BETWEEN 16Z AND 18Z.
OUTLOOK 00Z MONDAY THROUGH THURSDAY...
SUN NIGHT...VFR CIGS.
MON ...SUB-VFR CIGS AND VSBY LIKELY IN RAIN.
MON NIGHT-TUE...SUB VFR CIGS POSSIBLE W AND N OF NYC.
TUE NIGHT- WED...VFR.
WEDNESDAY NIGHT-THU...SUB VFR CONDITIONS POSSIBLE.
&&
.MARINE...
WINDS CONTINUE TO DIMINISH THIS AFTN AND WILL CONTINUE TO DO SO
TNGT FROM W TO E. THE HARBOR WILL BE DOWNGRADED TO A SCA WITH THE
AFTN FCST...WITH THE WRN SOUND SET TO EXPIRE AT 6PM AND THE REST
OF THE WATERS AT 10PM. THE WRN OCEAN MAY BE DOWNGRADED TO A SCA AT
6PM DEPENDING ON TRENDS.
MRGNL SCA WINDS POSSIBLE SUN AND SUN NGT ON WSW FLOW...THEN A
BETTER CHC FOR SCA CRITERIA BEHIND A CDFNT MON AND MON NGT.
LINGERING WNW FLOW MAY RESULT IN CONTINUING SCA CONDITIONS ON THE
ERN OCEAN TUE INTO TUE NGT. HIGH PRES BUILDS IN FOR WED WITH
WINDS/SEAS BLW SCA LVLS.
AN AREA OF LOW PRESSURE WILL PASS NEAR OR OVER THE AREA WATERS
WEDNESDAY NIGHT INTO THURSDAY. THIS LOW WILL PRODUCE NEAR GALE FORCE
GUSTS...WITH SEAS WELL ABOVE 5 FT. AS THE LOW DEPARTS THURSDAY NIGHT
INTO FRIDAY...WINDS AND SEAS WILL BE SLOW TO SUBSIDE...WITH SCA
CONDITIONS EXPECTED.
&&
.HYDROLOGY...
A CDFNT WILL PRODUCE A BAND OF SHRA THROUGH THE CWA ON MON
BRINGING LESS THAN 1/2 IN OF RNFL. A MORE SIGNIFICANT LOW PRES
SYSTEM WILL HAVE TO POTENTIAL TO PRODUCE MDT TO LOC HVY RNFL WED
NGT THRU THU.
&&
.OKX WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
NY...NONE.
NJ...NONE.
MARINE...GALE WARNING UNTIL 10 PM EST THIS EVENING FOR ANZ330-340-345-
350-353-355.
SMALL CRAFT ADVISORY UNTIL 10 PM EST THIS EVENING FOR ANZ338.
GALE WARNING UNTIL 6 PM EST THIS EVENING FOR ANZ335.
&&
$$
SYNOPSIS...JMC
NEAR TERM...JMC
SHORT TERM...JMC
LONG TERM...BC
AVIATION...GC
MARINE...JMC/BC
HYDROLOGY...JMC
