National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KOKX 241524
AFDOKX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW YORK NY
1124 AM EDT FRI MAY 24 2013

.SYNOPSIS...
A COLD FRONT MOVES ACROSS THE AREA TODAY. AS THE FRONT TRACKS ACROSS
THE AREA...A WAVE OF LOW PRESSURE WILL DEVELOP ALONG THE FRONT AND
SLOWLY TRACKS TO THE GULF OF MAINE BY SUNDAY MORNING. THIS LOW WILL
THEN LIFT INTO THE CANADIAN MARITIMES THROUGH MONDAY. HIGH PRESSURE
THEN BUILDS INTO THE SOUTH THROUGH WEDNESDAY NIGHT. A WARM FRONT
WILL APPROACH ON THURSDAY.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
-- Changed Discussion --
HOURLY TEMPS WERE ADJUSTED WITH A WEIGHTED 3/4 12Z NAM12 AND 1/4
LAV SOLUTION TO REPRESENT A COOLING TREND THROUGHOUT THE DAY.
DEWPOINTS ALSO INCORPORATED AN EVEN BLEND OF 12Z NAM12 AND LAVS.
THERE ARE SOME BREAKS IN THE SHOWER ACTIVITY SO WORDING WAS
ADJUSTED TO SHOW INTERMITTENT WITH SHOWERS BEHIND THE COLD FRONT.
ANY THUNDERSTORM POTENTIAL WILL BE ISOLATED AND AHEAD OF THE COLD
FRONT TOWARDS THE EASTERN MOST SECTIONS OF LONG ISLAND AND
SOUTHERN CONNECTICUT. LATE THIS AFTERNOON...THIS INSTABILITY
SHOULD DECREASE AS THE FRONT MOVES EAST OF THE AREA.

A COLD FRONT WILL ENTER THE REGION TODAY AND SLOWLY MOVE FROM WEST
TO EAST THROUGHOUT THE DAY. ADDITIONAL SHOWERS ARE LIKELY THROUGHOUT
THE DAY TODAY. AS THE FRONT MOVES ACROSS THE REGION...WINDS WILL
SHIFT FROM THE SOUTH TO THE WEST...AND EVENTUALLY NORTHWEST. WITH
THE FRONT MOVEMENT...EASTERN PARTS OF THE CWA SHOULD SEE THE WIND
SHIFT BY MID TO LATE AFTERNOON.

A LOW PRESSURE SYSTEM WILL DEVELOP ALONG THE FRONT AND LIFT NORTH
ACROSS THE REGION. THIS WILL KEEP CATEGORICAL POPS IN THE FORECAST
THROUGH THE DAY TODAY.

FOLLOWED A BLEND OF MAV/MET GUIDANCE FOR HIGHS TODAY. MAX
TEMPERATURES WILL RANGE FROM THE LOWER TO UPPER 60S...WITH THE
WARMEST TEMPERATURES ACROSS THE EASTERN HALF OF THE CWA...AND
COOLEST ACROSS THE WESTERN HALF. TEMPERATURES WILL GENERALLY FALL
THROUGH THE DAY...EXCEPT ACROSS THE EASTERN HALF OF THE CWA...WHERE
TEMPERATURES WILL RISE THROUGH MIDDAY...THEN FALL WITH THE PASSAGE
OF THE FRONT.

THERE WILL BE A HIGH RISK OF RIP CURRENTS TODAY ALONG THE ATLANTIC
FACING BEACHES OF LONG ISLAND.
-- End Changed Discussion --

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/...
THE FRONT CONTINUES TO SLOWLY SLIDE EAST WITH A SURFACE LOW PASSING
EAST OF THE AREA. MEANWHILE...AS THE MIDDLE AND UPPER LEVEL TROUGH
MOVES OVER THE AREA...A CLOSED LOW DEVELOPS. THIS SHOULD ALLOW ANY
OF THE PRECIPITATION TO TRANSITION FROM SHOWERS TO MORE OF A
STRATIFORM RAIN. MODEL GUIDANCE IN GOOD AGREEMENT WITH POPS
CONTINUING THROUGH TONIGHT. POPS WILL REMAIN LIKELY/CATEGORICAL.

ONCE AGAIN...FOLLOWED A MAV/MET BLEND FOR OVERNIGHT LOWS.
TEMPERATURES WILL FALL INTO THE 40S AND 50S...WITH THE WARMEST
LOCATIONS ACROSS THE FAR EASTERN PORTION OF THE CWA...AND THE
COOLEST ACROSS THE WESTERN. THIS WILL BE DUE TO COLD AIR FILTERING
IN ON A NORTHWEST FLOW BEHIND THE FRONT.

&&

.LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/...
GFS/NAM/ECMWF ALL REASONABLY CLOSE IN THEIR INTENSITY AND MOVEMENT
OF THE CLOSED LOW AND ASSOCIATED LOW PRESSURE MOVING SLOWLY NE THIS
WEEKEND. LIKELY/CATEGORICAL POPS EXPECTED EVERYWHERE ONCE AGAIN ON
SATURDAY. N-NW WINDS ON THE BACK SIDE OF THE LOW SHOULD BECOME
RATHER BRISK BY SAT AFTERNOON...FALLING JUST SHY OF ADVISORY
CRITERIA AT 15-25 MPH WITH WITH GUSTS BETWEEN 30 AND 35 MPH INTO
EARLY SAT EVENING. CAN NOT RULE OUT SOME GUSTS TO NEAR 40 MPH
EITHER. IN ADDITION...THERE IS A LOW CHANCE OF A THUNDERSTORM OVER
ERN CT/LONG ISLAND VIA SOME ELEVATED DESTABILIZATION AS DRY SLOT
PUNCHES IN FROM THE SW. WILL LEAVE OUT OF THE FORECAST FOR NOW WITH
LOW CONFIDENCE. TEMPS WILL BE RATHER COOL FOR LATE MAY...WITH HIGHS
ONLY 55-60 AND DROPPING INTO THE 40S SAT NIGHT.

STEADY RAIN SHOULD SHIFT EAST AND TAPER OFF IN INTENSITY SAT NIGHT
AS THE LOW PULLS E OF NEW ENGLAND...BECOMING MORE SHOWERY/ISOLD IN
NATURE ON SUNDAY VIA CYCLONIC LOW LEVEL FLOW AND PASSAGE OF
TRANSIENT MID LEVEL VORTICITY MAXES PINWHEELING AROUND THE UPPER LOW.
STILL COOL AND BREEZY ON SAT WITH HIGHS ONLY UPPER 50S/LOWER
60S...AND GUSTS 25-30 MPH.

DRY WX AND A GRADUAL WARM-UP TO NEAR SEASONABLE LEVELS IS THEN
FORECAST MON-WED AS HIGH PRESSURE MOVES ACROSS. TEMPS ON THU SHOULD
RETURN TO MORE SUMMER-LIKE LEVELS WITH THE APPROACH OF A WARM
FRONT...WHICH COULD BRING AFTERNOON SHOWERS AND POSSIBLE TSTMS
MAINLY TO AREAS WEST OF NYC.

&&

.AVIATION /15Z FRIDAY THROUGH TUESDAY/...
COLD FRONT OVER LI AND CNTRL CT TRACKS EWD AND OFFSHORE THIS AFTN.

WINDS VEER TO THE NW BEHIND THE FRONT AND INCREASE THRU THE DAY.
NW WINDS 15-20KT WITH GUSTS 25-29KT THIS AFTN.

AREAS OF IFR AHEAD OF THE FRONT...THEN MVFR BEHIND THE FRONT WITH
CIGS GENERALLY AROUND 2K FT. SHRA CAN BE EXPECTED BEHIND THE FRONT
AS WELL.

-RA AND MVFR TNGT WITH NW WINDS 15-25KT. GUSTS TO NEAR 30 KT
POSSIBLE.

     NY METRO ENHANCED AVIATION WEATHER SUPPORT...

DETAILED INFORMATION...INCLUDING HOURLY TAF WIND COMPONENT FCSTS CAN
BE FOUND AT:  HTTP:/WWW.ERH.NOAA.GOV/ZNY/N90 (LOWER CASE)

KEWR FCSTER COMMENTS: 1500FT CIGS MAY LINGER TIL 16-17Z. WINDS
WILL INCREASE THRU THE DAY.

THE AFTERNOON KEWR HAZE POTENTIAL FORECAST IS GREEN...WHICH IMPLIES
SLANT RANGE VISIBILITY 7SM OR GREATER OUTSIDE OF CLOUD.

KJFK FCSTER COMMENTS: OCNL 1500FT CIGS POSSIBLE TIL 17Z. WINDS
WILL INCREASE THRU THE DAY.

KLGA FCSTER COMMENTS: OCNL 1500FT CIGS POSSIBLE TIL 17Z. WINDS
WILL INCREASE THRU THE DAY.

KTEB FCSTER COMMENTS: OCNL 1500FT CIGS POSSIBLE TIL 17Z. WINDS
WILL INCREASE THRU THE DAY.

KHPN FCSTER COMMENTS: OCNL 1200FT CIGS POSSIBLE TIL 17Z. WINDS
WILL INCREASE THRU THE DAY.

KISP FCSTER COMMENTS: WIND SHIFT IN THE 15-16Z TIME PERIOD. NW
WINDS WILL INCREASE THRU THE DAY BEHIND THE FRONT.

.OUTLOOK FOR 12Z SATURDAY THROUGH TUESDAY...
.SATURDAY...VFR WITH AREAS OF MVFR. SHOWERS. NW GUSTS 25-30KT.
.SUNDAY...VFR. CHC AM SHOWERS. NW GUSTS 30-35KT.
.MONDAY THROUGH TUESDAY...VFR.

&&

.MARINE...
-- Changed Discussion --
FOG CONTINUES WITH REDUCED VISIBILITIES TO LESS THAN 1 MILE. THE
DENSE FOG ADVISORY RUNS UNTIL 1PM. PATCHY FOG IS POSSIBLE ON THE
CENTRAL OCEAN WATERS AND PORTIONS OF WESTERN LONG ISLAND SOUND.
EXPECTING THE FOG TO BREAK UP AFTER THE FRONTAL PASSAGE WITH
GREATER NW WINDS TOWARDS MID AFTERNOON.

SCA REMAINS UP FOR THE OCEAN WATERS THROUGH AT LEAST FRIDAY NIGHT
AS A LINGERING SWELL LIKELY KEEPS SEAS UP OVER 5 FT OVER A GOOD
PORTION OF THE OCEAN WATERS. GUSTS TO 25 KTS WILL BE POSSIBLE AS
WELL DURING PARTS OF THIS PERIOD ON THE OCEAN WATERS. NON-OCEAN
WATERS THROUGH FRIDAY SHOULD SEE GUSTS PEAK AT AROUND 20 KT...BUT
A FEW GUSTS TO 25 KT CANNOT BE COMPLETELY RULED OUT.

NORTHWEST FLOW ON THE BACK SIDE OF THE LOW AS IT MOVES INTO NEW
ENGLAND...SHOULD STRENGTHEN GUSTS TO GALE FORCE SAT
AFTERNOON/EVENING. GALE WATCH IN EFFECT FOR THE OCEAN WATERS...AS
WELL AS THE EASTERN SOUND AND PECONIC AND GARDINERS BAYS FOR
SATURDAY AND SATURDAY NIGHT. FOR THE REMAINDER OF THE
WATERS...HAVE WENT WITH A SMALL CRAFT ADVISORY WHERE GUSTS MAY
FALL JUST SHORT OF GALES. IT IS POSSIBLE WHERE THE SMALL CRAFT IS
ON SATURDAY AND SATURDAY NIGHT...GALES MAY BE NEEDED.

CONDITIONS FALL BACK TO SCA CONDITIONS LATE SATURDAY NIGHT AND
CONTINUE ON ALL WATERS INTO SUNDAY AFTERNOON...THEN GRADUALLY TAPER
OFF ON THE OCEAN AND THEN ERN SOUND/BAYS SUNDAY NIGHT. QUIET
CONDITIONS EXPECTED MON-TUE VIA BUILDING HIGH PRESSURE.
-- End Changed Discussion --

&&

.HYDROLOGY...
-- Changed Discussion --
MOST REMAINING SHOWERS THROUGH THE AFTERNOON WILL RESULT IN RAIN
AMOUNTS OF LESS THAN A QUARTER OF AN INCH AND AROUND A QUARTER OF
AN INCH FOR SOME EASTERN SECTIONS. FOR THE MOST PART...SMALL
STREAM LEVELS HAVE STABILIZED...WITH ONLY MINOR RISES EXPECTED IN
THE WAKE OF ANY SHOWER ACTIVITY.

AROUND 0.2-0.3 OF INCH OF RAINFALL IS EXPECTED TONIGHT - WITH
LOCALLY HIGHER AMOUNTS POSSIBLE. PRECIPITABLE WATERS DO DECREASE
TO UNDER 1 INCH BY LATE TONIGHT. AS A RESULT...THE RISK OF MINOR
URBAN/SMALL STREAM FLOODING LOOKS TO BE MINIMAL.

BASIN AVG QPF OF 1/2 TO 3/4 INCH EXPECTED SAT INTO SAT NIGHT...THEN
ONLY MINIMAL QPF IN LINGERING SHOWERS ON SUNDAY.

FOR DETAILS ON SPECIFIC AREA RIVERS AND LAKES...INCLUDING OBSERVED
AND FORECAST RIVER STAGES AND LAKE ELEVATIONS...PLEASE VISIT THE
ADVANCED HYDROLOGIC PREDICTION SERVICE /AHPS/ GRAPHS ON OUR WEBSITE.
-- End Changed Discussion --

&&

.OKX WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
CT...NONE.
NY...NONE.
NJ...NONE.
MARINE...SMALL CRAFT ADVISORY FROM 6 AM SATURDAY TO 6 AM EDT SUNDAY FOR
     ANZ335-338-345.
     DENSE FOG ADVISORY UNTIL 1 PM EDT THIS AFTERNOON FOR ANZ330-
     340-350.
     GALE WATCH FROM SATURDAY MORNING THROUGH LATE SATURDAY NIGHT
     FOR ANZ330-340-350-353-355.
     SMALL CRAFT ADVISORY UNTIL 6 AM EDT SATURDAY FOR ANZ350-353-
     355.
-- End Changed Discussion --

&&

$$
SYNOPSIS...BC/GOODMAN
NEAR TERM...JM/BC
SHORT TERM...BC
LONG TERM...BC/GOODMAN
AVIATION...JMC/JC
MARINE...BC/GOODMAN
HYDROLOGY...NV