Wilmington, Delaware 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

983
FXUS61 KPHI 151722
AFDPHI

Area Forecast Discussion
National Weather Service Mount Holly NJ
122 PM EDT Fri Aug 15 2025

.SYNOPSIS...
A cold front will be stationary over the Mid-Atlantic through
the weekend. High pressure over the northern Province of Quebec
builds down into the Canadian Maritimes and Northeast later
today through Saturday before departing Sunday. A cold front
passes through the region Sunday night then becomes stationary
over the Mid- Atlantic into the new week. High pressure builds
in from the north through the middle of next week.

&&

.NEAR TERM /THROUGH SATURDAY/...
High pressure ridged into the Northeast will circulate an east
to northeast flow of drier air this afternoon. There will still
be enough heat/instability to cause isolated showers/tstms to
develop later this afternoon mainly west and southwest of
Philadelphia. There is still potential for excessive rain with
tstms in southeastern PA and nearby NJ/DE.

Tonight, any shower/tstms activity will diminish by sunset.
Skies will become partly cloudy during the overnight period most
areas. Across southern NJ and Delmarva, low clouds will push in
from the ocean late. With light winds, patchy fog is possible
in all areas. Lows will be in the mid/upper 60s across the
northern areas while readings in the low 70s will be found
across metro Philadelphia and Delmarva.

Onshore flow on Saturday will keep it humid but not hot. Some
shortwave energy approaches from the west in the afternoon and
may spark off isolated afternoon showers and thunderstorms
mainly well north and west of Philadelphia. Highs will top off
in the mid to upper 80s with surface dew points in the upper 60s
to low 70s.

&&

.SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY NIGHT/...
Drier air then filters down into the region starting Saturday
night. Cooler with lows in the 60s to around 70.

On Sunday, high pressure over the Gulf of Maine builds down
into the western Atlantic. A cold front approaches from the west
and looks to pass through the region Sunday night. A southwest
flow increases ahead of the approaching front, and temperatures
will take a run at 90 once again with dew points around 70.

With the passage of that cold front, there does not look to be
strong shortwave energy, and the base of the upper trough will
remain well north of the area. PoPs will once again be capped at
20-30 percent, and storms do not look to be widespread or well
organized with minimal severe thunderstorm or flash flooding
threats.

Drier air filters down into the region Sunday night with dew
points dropping into the 60s and lows in the upper 60s to low
70s.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
The aformentioned cold front will become nearly stationary over
the Mid-Atlantic through the middle of the week. High pressure
south of Hudson Bay Monday morning will build east into the
Province of Quebec, then down into the Canadian Maritimes and
Northeast Tuesday before moving out to sea Wednesday. An upper
trough will lie over the Northeast during the time.

A somewhat cooler and drier airmass will build into the region.
Surface dew points will mainly be in the lower 60s during this
time (a far cry from the 70s) with highs in the upper 70s to
around 80 and lows in the 60s. Mostly dry Monday and Tuesday,
and then scattered showers and thunderstorms will begin to
impact the area starting Tuesday night and continuing through
Thursday as shortwaves move in from the west.

Potential impacts from what is currently Tropical Storm Erin,
but will soon become Hurricane Erin, including a high risk for
rip currents and at least minor coastal flooding, may affect the
area starting as early as Monday and lasting into Thursday.
Please refer to the National Hurricane Center for more details
and stay tuned to the local forecast.

&&

.AVIATION /17Z FRIDAY THROUGH TUESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

This afternoon...VFR. Isolated showers/tstms will develop
mainly south and west of Philadelphia. E winds 5 to 10 knots.

Tonight...VFR. Any shower/tstm activity will have diminished by
00Z. Onshore flow will result in IFR ceilings and patchy fog
mainly 08Z-12Z.

Saturday...VFR. Isolated thunderstorms after 18Z north and west
of Philadelphia.

Outlook...

Saturday night...VFR.

Sunday through Sunday night...Generally VFR, but scattered
afternoon and evening SHRA/TSRA may result in brief sub-VFR
conditions.

Monday through Tuesday...VFR.

&&

.MARINE...
Winds and seas remain below SCA levels through Saturday. Winds
will be from the E at 10 to 15 knots.

Outlook...

Saturday night through Sunday...Sub-SCA conditions.

Monday through Tuesday...Potential SCA conditions due to the
approach of what is currently Tropical Storm, and will soon be
Hurricane Erin. Elevated winds and seas will develop and should
last into at least Thursday.

Rip currents...

Today, northeast winds will turn east this afternoon, generally
around 10 mph. Breaking waves will be 1 to 2 feet with a light
easterly swell with a period will be around 8 seconds. As a
result, there is a LOW risk for the development of dangerous and
life threatening rip currents at the Jersey Shore and at
Delaware Beaches today.

For Saturday, northeast winds will be around 10 mph with
breaking waves around 2 feet. There will be a light easterly
swell with a period of 4 to 5 seconds. As a result, there is a
LOW risk for the development of dangerous and life threatening
rip currents at the Jersey Shore and at Delaware Beaches on
Saturday.

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

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...Air Quality Alert until 11 PM EDT this evening for NJZ001-
     007>010-012-015.
DE...None.
MD...None.
MARINE...None.

&&

$$

SYNOPSIS...Franklin/MPS
NEAR TERM...Franklin/OHara
SHORT TERM...MPS
LONG TERM...MPS
AVIATION...Franklin/MPS/OHara
MARINE...Franklin/MPS/OHara