Allentown, Pennsylvania 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

072
FXUS61 KPHI 040826
AFDPHI

Area Forecast Discussion
National Weather Service Mount Holly NJ
426 AM EDT Wed Jun 4 2025

.SYNOPSIS...
High pressure will remain anchored offshore through early Thursday.
A cold front will approach the area later on Thursday and Friday,
before tracking across the Mid-Atlantic region on Saturday. High
pressure will briefly build in later on Sunday into Monday. A
warm front will approach the forecast area on Tuesday.

&&

.NEAR TERM /THROUGH TONIGHT/...
High pressure centered off the coast of Virginia and North
Carolina will continue to slowly drift eastward through tonight.
With the continued influence of the high, no rain is forecast
through the period and subsidence will inhibit any afternoon
clouds to form. The elevated smoke and haze will continue today
but impacts at the surface should continue to remain minimal.

As warm air advection continues today with southwesterly flow,
high temperatures this afternoon look to be a few degrees warmer
still than on Tuesday, in the mid to upper 80s for most
locations and in the 70s along the coast. A mild night is in
store for much of the area with lows mainly in the low 60s. An
increase in cloud coverage is expected overnight though as the
high starts to drift far enough out to sea to allow cirrus
clouds to encroach on the area as a developing low riding along
the southeastern U.S. coast pushes northward.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
High pressure shifts well out to sea on Thursday and two low
pressure systems begin to approach the region. However, dry
weather is expected to continue through much of the day.

The first system is the low continuing to move northward along
the East Coast of the United States with the second system
approaching the region from the west. The high looks to hold
strong enough to keep the two systems at bay and the region
mostly dry. However, a partly to mostly cloudy day is expected
due to the relative proximity of the two systems. As a result,
temperatures for Thursday continue to be forecast a touch cooler
than previously, with highs on Thursday looking to potentially
fall just short of 90 degrees. It will still be quite warm
though, with highs again in the mid to upper 80s.

As we get later in the day Thursday, the cold front associated
with the system approaching from the west does look to get close
enough that we could see some isolated to scattered showers and
possibly a thunderstorm, mainly across northeast PA and
northwest NJ, before the front stalls just to the north and west
of the region.

With high pressure fully offshore, the cold front will inch
closer on Friday though its progress looks to be impeded with
little upper-level support and the continued presence of the
coastal surface low now just south of the region. Most forecast
models, have the coastal low moving out to sea Friday night in
the waking of the departing high. With this action, we`re
expecting more showers to track into the forecast area, possibly
down to the 95 with chances increasing Friday night as the cold
front moves closer. PWAT values will start creeping up across
the region too, topping out between 1.25-1.75 inches. As a
result, there will be potential for a heavy shower or downpour.

Temperatures will continue to run above normal through the
remainder of the period. Overnight lows will mainly be in the
60s with highs on Friday mainly in the low to mid 80s.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
By Saturday, with an upper level trough beginning to deepen to
our west and the coastal low moving further offshore, the cold
front will finally have the support to begin to move across the
area, and lead to increasing chances of precipitation. There is
some instability forecast with CAPE values of 500-1000 J/kg,
and PW values increase to 1.5-2.0 inches. So there will be the
potential for thunderstorms and brief heavy downpours. Mid level
winds are forecast to be fairly weak, 40-50 knots or less, so
shear is not expected to be overly strong. However, there could
be a few isolated strong storms.

The front is forecast to stall to our south Sunday as high pressure
builds to our north, possibly leading to dry conditions later Sunday
into early Monday. Later Monday and into Tuesday, said front
will inch north as a warm front. Showers and Thunderstorms will
pop again as a result.

Temperatures throughout the period look to be within a few
degrees of normal for early June. Highs will be in the 70s to
lower 80s and lows will mainly be in the 60s.

&&

.AVIATION /09Z WEDNESDAY THROUGH SUNDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.

Early this morning...VFR. Winds light and variable. High
confidence.

Today...VFR. South winds around 10 knots. High confidence.

Tonight...VFR conditions expected. Winds less than 5 knots,
favoring a southerly direction. High confidence.

Outlook...

Thursday-Thursday night...Prevailing VFR conditions expected.
A very low chance (15% or less) a shower or thunderstorm gets
into KABE or KRDG.

Friday-Saturday...Sub-VFR conditions possible, particularly
Friday night into Saturday. A chance (35-50%) on Friday of
showers and thunderstorms then showers becoming likely (60-70%)
by Saturday with a continued chance for thunderstorms,
potentially resulting in lower conditions at times.

Sunday...Mainly VFR conditions but a slight chance (15-25%) for
showers or a thunderstorm remains at this time.

&&

.MARINE...
No marine headlines are in effect through tonight. Southerly winds
around 10 kts though a few gusts up to 20 knots are possible,
particularly this evening. Otherwise, seas around 2-3 feet with
fair weather.

Outlook...

Thursday and Friday...Sub-SCA conditions expected. However, winds
will gust around 20 knots at times, particularly on Thursday,
and seas will increase to 3-4 feet.

Friday Night and Saturday...Small Craft Advisory conditions
possible. Shower and storms will be possible Friday into
Saturday, which may lead to locally higher winds and waves. Seas
build to 3-5 feet.

Sunday...Sub-SCA conditions expected.

Rip Currents...

There will continue to be a LOW risk of rip currents through
Thursday. For today, expect south winds around 10-15 mph and
breaking waves around 1-2 feet with a period of 7-8 seconds. For
Thursday, similar conditions can be expected as south to
southwest winds will be around 10 to 15 mph with breaking waves
around 1-2 feet.

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

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...None.

&&

$$

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