FXUS61 KOKX 070525

Area Forecast Discussion
National Weather Service New York NY
125 AM EDT Tue Apr 7 2020

High pressure moves offshore Today. A low pressure system
approaches tonight and moves across on Wednesday. Another low
and its associated cold front cross the region on Thursday. This
low will pull away into the Canadian Maritimes on Friday,
followed by high pressure building from the Plains states on
Saturday. Low pressure will then approach from the Tennessee
Valley on Sunday, with a trailing cold frontal passage Sunday
night and possibly into Monday.


Mid and high level clouds will continue moving across the area
early this morning. Otherwise, high pressure will remain in
place with light winds. The clouds should keep temperatures in
the 40s across most of the area, with a few outlying locations
falling into the mid 30s.


High pressure will shift offshore during the day on Tuesday as
a warm front associated with an area of low pressure tracking
across the Upper Midwest and into the Great Lakes begins to
approach the region from the southwest. While the majority of
the daylight hours are expected to remain dry, clouds will
increase, and a few showers aren`t out of the question by early
evening across northeast New Jersey.

Showers then become more likely Tuesday night as the warm front
approaches, with the best chance of rain late Tuesday night
into early Wednesday morning as the surface low reaches the
area. Overall rainfall amounts are expected to remain light,
generally around two tenths of an inch.

After daytime highs in the 60s across much of the area,
overnight lows will only fall back into the 40s to around 50,
several degrees above normal.


Rain chances will begin to decrease Wednesday afternoon as the
low moves off to the east. A brief break in the rain is then
expected Wednesday evening into Wednesday night before a second,
more potent, low approaches from the west. This will result in
another round of rain on Thursday as this low and its
associated cold front approach. With significantly stronger
dynamics, can`t rule out at least a few rumbles of thunder
during the afternoon as the cold front crosses the area. Dry
weather then returns Thursday night as the low quickly moves off
to the northeast.

As the deep vertically stacked low pulls away, a trailing sfc
trough should move across on Friday with isold-sct showers.
Brisk W-NW winds nearing advy criteria may also be possible by
late morning and afternoon as the pressure gradient tightens
with the approach of this trough, also after its passage via
enhanced downward motion/momentum transfer. Fairly brisk winds
should last into Fri night and Sat morning, then diminish on Sat
as the high passes overhead.

A return S flow should become established Sat night into Sunday
between the departing/strengthening high, and a srn stream wave
of low pressure lifting out of the TN Valley, with increasing
rain chances late Sat night into Sunday. Strong S winds may be
possible between the two systems on Sunday especially at the
coast as a long S fetch and tight pressure gradient develop. The
associated enhanced low level warmth/moisture transport could
also lead to locally heavy rain and isolated thunder, more so
across S CT and Long Island.

Some showers may linger into Mon morning if not longer as the
system pulls away. How quickly it pulls away depends on the amt
of srn/nrn stream interaction at that time, which is uncertain.

Temperatures will remain a few degrees above normal for much of
the region on Wednesday before remaining near normal on
Thursday. Temps at least a few degrees below normal on Friday
should get a little closer to normal on Sat from NYC north/west,
then range a few degrees above normal throughout Sunday into


High pressure builds across the area today. An area of low
pressure approaches tonight.

VFR through today with MVFR developing for the 30 hour TAF sites
after 06Z Wednesday.

NW winds under 10 kts overnight becoming SW this morning
increasing in speed. Winds become S/SE late this afternoon
generally under 10 kts.

.Wednesday...MVFR to IFR with showers.
.Thursday...Becoming VFR with showers ending. Possible LLWS.
.Saturday...VFR and breezy.


Sub-SCA conditions are expected on all waters through Wednesday
night. Winds then increase Thursday afternoon as a cold front
crosses the waters, with gusts around 25 kt possible. Ocean seas
will also increase to around 5 ft Thursday night and 5-7 ft
during the day on Friday before gradually subsiding Friday
night. W-NW gales may be possible on Friday, especially near
shore and also on the outer ocean waters.


No hydrologic impacts are expected through the weekend, with
rainfall amounts remaining less than 0.25" Tuesday night into
Wednesday and less than 0.5" on Thursday. Basin avg rainfall of
1/2 to 1 inch appears likely from Sunday into Sunday night.


A coastal flood statement has been issued for Tuesday evening
and night for Lower New York Harbor, south shore back bays of
western Long Island, and for locations adjacent to western Long
Island Sound. Additional statements and/or advisories are
likely through Wednesday night.

Astronomical tides will be increasing Tuesday and Wednesday due to a
full moon (supermoon). While there could be a few locations that
get close tonight into Wednesday morning, the best chance will
be from Tuesday evening through Wednesday night. Much of the
guidance points toward Wednesday night having the greatest
potential for widespread minor and even localized moderate

Most locations during this time need anywhere from 1/2 to
1 1/2 ft of surge to reach minor coastal flood benchmarks.
During this time, there is little in the way of wind forcing or
tidal piling. The main factor will be the high astronomical
tides and background positive tidal anomaly. The ETSS is bit
more aggressive with the Wednesday night high tide cycle as it
has low pressure passing to the south with easterly winds
briefly increasing during this time.


NYC NOAA Weather Radio Station KWO35 (162.55 MHz) is undergoing
its final stages of testing, and is operating at full power.





NWS OKX Office Area Forecast Discussion