Easton, Pennsylvania 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

060
FXUS61 KPHI 201948
AFDPHI

Area Forecast Discussion
National Weather Service Mount Holly NJ
348 PM EDT Tue May 20 2025

.SYNOPSIS...
The base of high pressure over the area lifts north of the
region tonight. Low pressure over the Midwest moves east into
the Ohio Valley, and a secondary low will form over the Mid-
Atlantic on Wednesday. This low slowly lifts to the north and
east and will merge with the primary low over New England late
this week. High pressure briefly builds through the region late
this weekend. Low pressure may pass south of the area early in
the new week.

&&

.NEAR TERM /THROUGH WEDNESDAY/...
Benign weather conditions for the remainder of the day,
gradually give way late tonight as the next weather system
arrives early on Wednesday. Temperatures this afternoon range
from the mid 60s to near 70 across most of the region under
increasingly cloudy skies with cirrus moving in ahead of the
next system. Heading into this evening, cloud coverage will
continue to increase, mitigating the amount of radiational
cooling this evening. Temperatures remain near or above 60
through the early overnight hours. Conditions will remain dry as
well as dry air aloft looks to prevent any precipitation from
reaching the ground until well after midnight. Lows tonight
bottom out only in the low-mid 50s.

As the initial surface low arrives into the Ohio River valley
overnight, conditions will begin to moisten up both at the
surface and aloft. The initial surface low will be weakening as
it moves eastward but a new surface low will develop to its
southeast over eastern North Carolina and Virginia as an upper-
level trough also continues to shift eastward. As a result, some
light rain may begin reaching the ground after 2-3 AM Wednesday
but more steady periods of rain don`t look to arrive until
after sunrise Wednesday as the new low begins to organize.
Periods of rain then continue throughout much of the day
Wednesday, with a rumble of thunder or two possible across
Delmarva. A brief break in the rain may come Wednesday afternoon
and evening as the low moves off the coast of the Mid- Atlantic
before the next shortwave within the upper-level trough
arrives. Overall, an initial dousing of 0.25-0.75 inches of rain
is expected on Wednesday with localized areas that see any
banded precipitation or more organized convection receiving
slightly enhanced totals. Localized flooding may occur as a
result but widespread impacts are not expected.

With the developing surface low initially centered to the south
of the region, increasing onshore flow is expected through the
day Wednesday. Wind gusts of 25-35 mph are expected near and
southeast of the I-95 corridor by Wednesday afternoon with an
enhancement along the immediate coast where gusts up around 40
mph are possible. Temperatures only make it back to the upper
50s/low 60s on top of the aforementioned rain and wind, so
suffice to say, Wednesday will not be a pleasant one across the
region.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/...
Secondary low off the Mid-Atlantic coast will continue to
organize and develop Wednesday night as shortwave energy
associated with a closed upper low over the Great Lakes passes
through the region. The base of that low will be over the Mid-
Atlantic, and that is where that shortwave energy will be
focused. Meanwhile, the primary low continues to meander over
the eastern Great Lakes and Ohio Valley. The secondary low
continues to intensify over the western Atlantic Ocean as it
lifts along the coast and towards New England Thursday and
Thursday night. The secondary low then merges with the primary
low over northern New England on Friday.

Periods of moderate to locally heavy rain will continue over
the area Wednesday night and Thursday, and the axis of heavy
rain will gradually lift north throughout the day, with rain
beginning to wind down over Delmarva late Thursday. With several
shortwaves passing through the base of the low over the Mid-
Atlantic, there is a slight chance for thunderstorms, mainly
over Delmarva and southern New Jersey Wednesday night, then
again Thursday afternoon. In total, between 1/2 and 1 inch of
rain will fall over Delmarva and extreme southern New Jersey
during this time, while an inch or so will fall over southeast
Pennsylvania and most of New Jersey with as much as 2 inches of
rain is possible over coastal New Jersey as the low lifts north
along the coast. East winds will generally average 10 to 15 mph
with 20 to 25 mph gusts, and stronger winds are possible along
the coast.

The secondary low will be over New England Thursday night,
continuing to lift to the northeast towards the Gulf of Maine on
Friday. The primary low will lowly pass north of the region
from the eastern Great Lakes, through northern New York State,
eventually merging with the secondary low somewhere over Maine
on Friday. Several shortwaves will continue to pass through the
local region, so showers will continue to pass through from
time to time, but those showers will not be widespread as they
will be Wednesday night and Thursday, and additional QPF
Thursday night and Friday will generally around 1/10 inch or so.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
The upper level low will be over the Canadian Maritimes over
the weekend, and shortwaves passing through the region may keep
unsettled weather through Sunday. Slight chance to chance PoPs
are possible mainly for northern zones on Saturday, and then
slight chance PoPs are possible for Sunday. QPF will be minimal,
and the weekend will certainly not be a washout. Temperatures
will be below normal this weekend, but temperatures will be
creeping up somewhat from what they will be late this week.
Highs will mostly be in the 60s on Saturday, and then in the 60s
to low 70s on Sunday.

The upper low departs by Monday and weak surface high pressure
noses in from the west. Low pressure organizing and developing
over the Gulf Coast states will lift north and east and looks to
pas south of the region. Uncertain as to how far north this
system will be able to track. For now, will follow NBM PoPs and
will carry slight chance- chance PoPs on Monday and chance PoPs
on Tuesday, but there may end up being a tight north-south
gradient depending on the strength and placement of the
aforementioned high. Highs creep back up into the low 70s early
in the new week.

&&

.AVIATION /19Z TUESDAY THROUGH SUNDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.

Rest of Today...VFR with increasing mid-high clouds. North-
northwest winds around 5-10 kt becoming north-northeast late in
the afternoon. High confidence.

Tonight...VFR ceilings are expected for most of the night with
MVFR ceilings developing after 09Z where periods of rain are
likely. Light northeast winds early will settle out of the east-
southeast around 5-8 kt after 07-09Z. Moderate confidence.

Wednesday...Mainly MVFR conditions to start but becoming IFR
Wednesday morning as periods of rain continue to move through
the terminals. Winds out of the east-southeast, initially around
5-10 kts but increasing to 10-15 knots with gusts of 20-25
knots. Gusts up to 30 knots possible, particularly for KMIV and
KACY. Moderate confidence.

Outlook...

Wednesday night through Thursday...IFR/LIFR in RA/BR. E winds
10 to 15 kt with 20 to 25 kt gusts, though gusts up to 30 kt
possible at KACY.

Friday through Saturday...Mostly VFR, but brief sub-VFR
conditions possible in scattered SHRA.

Sunday...VFR.

&&

.MARINE...
No marine headlines are in effect through tonight then a Small
Craft Advisory goes into effect for all coastal waters,
including the Delaware Bay, at 10 AM Wednesday.

East-southeast winds this afternoon and evening around 10 kts.
For tonight, southeast winds will increase again to around 10-15
kt with gusts up to 20 kt possible. Seas of 1-3 feet. Fair
weather expected through the evening and much of the night with
periods of rain developing early Wednesday morning.

East-southeast winds continue to increase daytime Wednesday
resulting in the development of SCA conditions. Sustained winds
around 15-20 knots expected with gusts up to 30 knots possible.
Seas also build to 4-6 feet. Periods of rain continue through
daytime Wednesday as well.

Outlook...

Wednesday night through Thursday...SCA in effect through at
least Wednesday night, and the SCA will likely have to be
extended into Thursday, at least for the NJ ocean waters. VSBY
restrictions in rain and fog, and an isolated thunderstorm is
possible from time to time.

Friday through Sunday...Sub-SCA conditions.

Rip Currents...

For today, north winds will be around 10-15 mph then become
southeast around 5-10 mph with a 6-7 second period and breaking
waves of 1-2 feet. A LOW risk for the development of dangerous
rip currents is in place for all beaches.

For Wednesday, east winds will increase to 15-25 mph with a 5-6
second period and breaking waves of 3-5 feet. A MODERATE risk
for the development of dangerous rip currents is in place for
all beaches, however a HIGH risk may be warranted pending
further conditions.

For specific beach forecasts, visit weather.gov/beach/phi

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...Small Craft Advisory from 10 AM Wednesday to 6 AM EDT Thursday
     for ANZ430-431-450>455.

&&

$$

SYNOPSIS...MPS
NEAR TERM...AKL
SHORT TERM...MPS
LONG TERM...MPS
AVIATION...AKL/MPS
MARINE...AKL/MPS