Lower Macungie, Pennsylvania 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

040
FXUS61 KPHI 261041
AFDPHI

Area Forecast Discussion
National Weather Service Mount Holly NJ
641 AM EDT Tue May 26 2026

.WHAT HAS CHANGED...
Updated aviation discussion for 12z TAFs

Expired the Marine Dense Fog Advisory

&&

.KEY MESSAGES...
1. Patchy fog across the area could result in some slow downs
with this morning`s commute. A Dense Fog advisory was issued for
areas north and west of Philadelphia.

2. The unsettled pattern continues through Wednesday, though
today will feature some improvement.

3. Drier and more seasonable conditions return for the end of
the week into the weekend.

&&

.DISCUSSION...
KEY MESSAGE 1...Patchy fog across the area could result in some
slow downs with this morning`s commute. A Dense Fog advisory
was issued for areas north and west of Philadelphia.

With recent rainfall and light winds, some patchy fog has
developed across the region. Looking at surface observations,
satellite, and traffic cameras, it does appear that areas of
dense fog have developed across the Lehigh Valley, Poconos, and
NW NJ. Ended up issuing a Dense Fog Advisory for these areas
through 8 AM as visibility as low as a quarter of a mile are
likely and currently being observed.

Further south and east towards Philadelphia, and points
south/east, fog has developed though visibilities are a bit
higher. Ended up leaving these zones out of the Dense Fog
Advisory given higher visibilities but will continue to monitor
how things trend as we get towards the morning commute.

Always have low-beams on when encountering fog and allow some
extra time for travel this morning!


KEY MESSAGE 2...The unsettled pattern continues through
Wednesday, though today will feature some improvement.

A stationary front is positioned over our area this morning and
will slowly sink southward as the day goes on. Today actually
will see some marked improvement compared to the holiday
weekend. A low chance (25-30%) of showers is in the forecast for
southern Delmarva and far South Jersey, but most of the area
should stay dry today with even some peeks of sunshine.
Temperatures should hover in the upper 70s/low 80s.

The stationary front will set up over Delmarva for tonight and
tomorrow, with a wave of low pressure moving along it. This will
result in a few more rounds of showers for the Tuesday Night and
Wednesday period, mainly for areas south of I-78. A cold front
will sweep in on Wednesday from the northwest, which will put an
end to the unsettled pattern. Rainfall amounts around a half
inch or more are expected south of Philadelphia with anywhere
from a few hundredths to a quarter of an inch expected north of
the Philadelphia metro. No significant impacts are expected with
these rounds of rain. Temperatures Wednesday should be similar
to today, hovering around 80.

Once the cold front comes through on Wednesday Night, a
transition to more tranquil and nicer weather is expected.


KEY MESSAGE 3...Drier and more seasonable conditions return for
the end of the week into the weekend.

Behind the cold front from Wednesday, we trend slightly cooler for
Thursday which continues into the weekend. High temperatures for
most locations will be in the 70s during this timeframe and lows
generally in the 50s. A high pressure system is forecast to
gradually build into the region Thursday and remain in place into
the weekend. A low pressure system is also forecast to move into the
Northeast Friday into Saturday, but model guidance trends continue
to show the high pressure system having more of an influence across
our area. Due to this high pressure system in control, it looks to
be a drier end of the week and continue into the weekend.
to the weekend.

&&

.AVIATION /12Z TUESDAY THROUGH SATURDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Today...Any lingering fog should mix out by 13z, then primarily VFR
through the rest of the day. Cannot rule out some MVFR stratus
at KACY/KMIV but given the chance is only around 20-30%, have
elected to keep out of the TAFs for now. Winds out of the
north/northeast gradually veering through the morning and
becoming south/southwesterly between 16z-18z around 5-10 kt.
Moderate confidence.

Tonight...VFR conditions drop to MVFR between 05z-09z and then
down to IFR or even LIFR with fog and stratus developing with
rain moving through late in the night. Have added a period of
LIFR conditions at KACY/KMIV around 10z-11z due to low CIGs and
potentially low VSBY. Winds out of the south/southwest 5 kt or
less. Low confidence.

Wednesday...MVFR/IFR conditions expected with scattered showers
and low clouds. Low confidence.

Outlook...

Thursday through Sunday...VFR. No significant weather.

&&

.MARINE...
The Marine Dense Fog Advisory was allowed to expire as
visibility appears to have improved. Sub- SCA conditions
expected through Wednesday. Seas of 2 to 4 feet.

Outlook...

Wednesday Night through Saturday...The conditions are
anticipated to be below Small Craft Advisory criteria.

Rip Currents...

For today, winds will shift to the east-southeast and will be
light, around 5 to 10 MPH. Wave heights continue to lower as
well. A medium period swell will continue. Given less energy in
the surf zone with lower wave heights and very light winds
through today, have elected for a LOW risk for the development
of rip currents for today.

On Wednesday, winds turn more offshore with breaking waves only
around 1 to 2 feet. A medium period 7 second well will persist.
With offshore winds and low wave heights, a LOW risk for the
development of dangerous rip currents is in place.

Ocean temperatures are mainly in the 50s to low 60s. These cold
water temperatures can quickly cause hypothermia and physical
incapacitation to anyone suddenly immersed in the water.

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

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Dense Fog Advisory until 8 AM EDT this morning for PAZ054-055-
     060>062-101>103-105.
NJ...Dense Fog Advisory until 8 AM EDT this morning for NJZ001-
     007>010.
DE...None.
MD...None.
MARINE...None.

&&

$$

DISCUSSION...Guzzo/Hoeflich
AVIATION...Guzzo/Hoeflich
MARINE...Guzzo/Hoeflich