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-- Discussion containing changed information from previous version are highlighted. --
989
FXUS61 KOKX 281459
AFDOKX

Area Forecast Discussion
National Weather Service New York NY
1059 AM EDT Wed Jun 28 2017

.SYNOPSIS...
High pressure builds into the region today, and offshore on
Thursday. A warm front moves north of the region Thursday
night. Bermuda high pressure then dominates Friday into
Saturday before a cold front moves through Sunday into Sunday
night. The front may then linger just south of the region early
next week.

&&

.NEAR TERM /THROUGH TONIGHT/...
-- Changed Discussion --
Forecast still on track this morning.

A 1024 mb high was centered over WV late this morning. The high
will drift eastward through tonight. Sct flat cu were starting
to develop in the higher elevations and should become more
widespread this afternoon.

Below normal highs are forecast, mainly in the upper 70s to near
80 degrees. Bumped up highs a couple degrees on Long Island
since sea breeze (if any) will be arriving late.
-- End Changed Discussion --

&&

.SHORT TERM /THURSDAY/...
-- Changed Discussion --
As the high drifts ewd over the Atlantic, the winds will begin
to respond to lowering pres over srn Ontario. This flow, coupled
with the sea breeze circulation, should produce windy conditions
along the coasts by late in the day. Otherwise, all other areas
should have a sly breeze at least. The latest modeling from the
NAM, GFS and ECMWF keeps any frontal systems N of the CWA, so
pcpn has been removed from the fcst. Humidity will increase due
to the increasing flow off the ocean, and temps will warm to aoa
average as a thermal ridge begins to build in. The 00Z models
have around 14-16C at H85 by the end of the day. If things
unfold as currently expected, dangerous rip currents will be
possible, particularly in the late aftn and eve, requiring a
high risk fcst.
-- End Changed Discussion --

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
The main trend in the long term is for warmer and more humid
conditions to take shape over the Tri-State.

On the larger scale, a shortwave passes to the north Thursday night
followed by rising heights and western Atlantic ridging taking shape
Friday into Saturday. This ridge axis moves offshore Sunday as the
next shortwave trough moves across New England through Sunday night.
Another shortwave trough may follow early next week. Models and
ensembles are in good agreement overall on the large scale through
the weekend, then diverge a bit with the handling of any shortwaves
early next week.

At the surface, a warm front moves north of the region Thursday
night. Bermuda high pressure will then influence the weather Friday
into Saturday before a cold front moves through Sunday into Sunday
night. There may be weak surface trough development to the NW of NYC
each day before the cold front moves through Sunday. This front may
then linger to the south early next week.

Shower and thunderstorm chances appear slim Thursday night and
mainly to the north and west of NYC. The same holds true on Friday
into Saturday as ridging and heights build aloft. The best chance of
any convection is mainly from the city north and west. Shower/storm
chances increase a bit across the entire area on Sunday with the
passage of the cold front and approaching shortwave. Drier
conditions return on Monday with the next chance at showers and
storms on Tuesday.

Temperatures Friday and Saturday will be in the upper 80s with
increasing humidity levels. A few 90 degree readings are also
possible in the NYC metro and NE NJ. Max heat indices look to stay
in the lower 90s both days at this time at these locations, with
upper 80s elsewhere. Closer to the coast, onshore flow will keep
highs in the lower to middle 80s. Temperatures should be a bit
cooler on Sunday in the lower and middle 80s due to increasing
clouds and higher coverage of showers/storms. Highs should gradually
fall back closer to normal early next week.

&&

.AVIATION /15Z WEDNESDAY THROUGH SUNDAY/...
High pressure builds into the region through today and offshore
on Thursday. VFR conditions are expected through the TAF period.
Only issue today is expected to be gusty winds 15-20 kt from the
S-SW from late this morning until this evening. Winds diminish
tonight before increasing further on Thursday.

     NY Metro Enhanced Aviation Weather Support...

Detailed information, including hourly TAF wind component fcsts,
can be found at http:/www.weather.gov/zny/n90

KJFK TAF Comments: High confidence in category forecast.
Moderate confidence in wind forecast. Gust timing could be 2-3
hours off from forecast.

KLGA TAF Comments: High confidence in category forecast.
Moderate confidence in wind forecast. Gust timing could be 2-3
hours off from forecast.

KEWR TAF Comments: High confidence in category forecast.
Moderate confidence in wind forecast. Gust timing could be 2-3
hours off from forecast.

The KEWR afternoon haze potential forecast is GREEN, which implies
slant range visibility more than 6SM outside of cloud.

KTEB TAF Comments: High confidence in category forecast.
Moderate confidence in wind forecast. Gust timing could be 1-2
hours off from forecast.

KHPN TAF Comments: High confidence in category forecast.
Moderate confidence in wind forecast. Gust timing could be 1-2
hours off from forecast.

KISP TAF Comments: High confidence in category forecast.
Moderate confidence in wind forecast. Gust timing could be 2-3
hours off from forecast.

.OUTLOOK FOR 12Z THURSDAY THROUGH SUNDAY...
.Thursday...Mainly VFR. SW G20-25kt aftn/evening. Slight chance
of an shower/thunderstorm at night.
.Friday...Mainly VFR. SW G20kt late morning through the evening.
Chance of shra/tstm, mainly for the afternoon into early
evening.
.Saturday...Mainly VFR. SW G20kt aftn/evening. Chance of
shra/tstm mainly for the afternoon and night.
.Sunday...Mainly VFR. Chance of shra/tstm.

&&

.MARINE...
-- Changed Discussion --
Winds and seas will remain below SCA levels thru tonight.
Southerly winds will then increase on Thu, with SCA conditions
possible by aftn. Strong SW flow continues on the waters
Thursday night into Friday, with SCA conditions likely on the
ocean. Gusts will be highest Thursday night, 25-30 kt and then
closer to 25 kt on Friday. Ocean seas will be 5-7 ft Thursday
night, subsiding to around 5 ft late Friday. 5 ft seas may
linger into Friday night. A weaker pressure gradient is expected
this weekend leading to sub-sca conditions on all waters.
-- End Changed Discussion --

&&

.HYDROLOGY...
No hydrologic impacts expected through the beginning of next
week.

&&

.EQUIPMENT...
Observations from KFRG (Farmingdale, NY) may be sporadic.
Observations from KHPN (White Plains NY) and KHVN (New Haven
CT) are being disseminated through backup methods. All is due to
an FAA communication line outage. Return to full service time
is unknown.

&&

.OKX WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...None.
NJ...None.
MARINE...None.

&&

$$
SYNOPSIS...JMC/DS
NEAR TERM...JMC/Goodman/DS
SHORT TERM...JMC
LONG TERM...DS
AVIATION...FEB/JM
MARINE...JMC/Goodman/DS
HYDROLOGY...JMC/DS
EQUIPMENT...