Harrington, Delaware 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

140
FXUS61 KPHI 112144
AFDPHI

Area Forecast Discussion
National Weather Service Mount Holly NJ
544 PM EDT Wed Jun 11 2025

.SYNOPSIS...
Broad high pressure over the Mid-Atlantic slides offshore by
Friday. A weak cold front approaches from the west Thursday
night and becomes nearly stationary over the Mid-Atlatic into
the weekend. Several waves of low pressure will affect the area
starting late Friday and continuing into the new week.

&&

.NEAR TERM /THROUGH THURSDAY/...
High pressure located across the Ohio River Valley will break
down through tonight, but fair weather will remain with zonal
flow aloft.

On Thursday, the high will continue to break down, before a
cold front approaches from the northwest late in the afternoon
into the evening. Fair weather will continue for much of the
day, however, by late in the afternoon and into the evening, as
the cold front moves into the area, there will be a slight
chance of showers and isolated thunderstorms for portions of
northeast Pennsylvania and northern New Jersey. As 700-500 mb
winds increase to 40-50 knots, any thunderstorms that do develop
could end up producing locally gusty winds; and with PW values
approaching 1.25-1.50 inches, some locally heavy gullywashers
will be possible.

&&

.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/...
High pressure just northeast of the region Friday morning moves
offshore Friday afternoon. A stationary front will be draped
over the Mid-Atlantic area, and low pressure slowly approaches
from the west late Friday on that boundary. The low passes
through Delmarva and southern New Jersey Saturday morning
through Saturday afternoon before departing.

A few showers and perhaps a thunderstorm may develop late
Friday afternoon as some shortwave energy approaches from the
west but the bulk of the activity hold off until Friday night
through Saturday morning with the passage of the low. Highest
instability will be focused on Delmarva, generally in the
vicinity of the low, but not expecting severe weather. Will
carry slight chance to chance for thunderstorms, mainly Friday
night.

After the low departs late Saturday morning, the stationary
front over the Mid-Atlantic lifts north as a warm front as low
pressure moves into the Great Lakes. Some shortwave energy ahead
of that low moves into the northern half of the forecast area.
With surface dew points rising through the 60s and approaching
70, another round of showers and thunderstorms is possible late
in the day. PoPs will mostly be chance, but PoPs will be likely
for portions of the southern Poconos and western Lehigh Valley.
The threat for severe weather is minimal, but with increasing
dew points and PWATs over 1.5 inches for most of the area, and
over 2 inches for Delmarva, locally heavy rain is a threat.

&&

.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
Low pressure approaches from the west and slowly works its way
through the Mid-Atlantic and Delmarva Sunday through Monday. A
prolonged period of unsettled weather is on tap during this time
with showers and isolated to scattered thunderstorms. Given
abundant low level moisture with surface dew points well in the
60s, locally heavy rain will develop from time to time. WPC has
a Marginal Risk (1 out of 4) for excessive rain Saturday night
through Sunday and again Sunday through Sunday night. Rain
tapers off on Monday as low pressure departs. With a prolonged
period of onshore flow, temperatures will be on the cool side
through the weekend and into Monday with highs on Sunday in the
low to mid 70s and highs on Monday in the upper 60s to low 70s.

Several additional shortwaves approach from the west as the
week progresses, and weak waves of low pressure will develop as
a result. This will keep low chance PoPs in the forecast through
Wednesday. Temperatures will rebound somewhat on Tuesday before
warming back into the 80s on Wednesday.

&&

.AVIATION /22Z WEDNESDAY THROUGH MONDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.

Rest of today...VFR conditions continue. West to southwest
winds 5- 10 knots.

Tonight...VFR expected. Southwest winds 5 knots or less, becoming
light and variable overnight.

Thursday-Thursday night...VFR. Slight chance of showers or
thunderstorms in northeast Pennsylvania and northern New Jersey.
West winds 5-10 knots during the day, then light and variable
overnight. Occasional gusts 15-20 knots possible.

Outlook...

Friday...VFR initially, then scattered afternoon SHRA develop
with brief sub-VFR conds possible, mainly west of the I-95
terminals.

Friday night through Saturday...Sub-VFR in SHRA and scattered
TSRA. A break in SHRA possible around midday Saturday before
ramping up again Saturday afternoon.

Saturday night through Monday...Sub-VFR likely in RA and
scattered TSRA.

&&

.MARINE...
Rest of today-Thursday night...Conditions remain below advisory
levels.

Outlook...

Friday through Monday...Overall, sub-SCA conditions expected,
though there is the potential for SCA conditions Sunday night
through Monday. VSBY restrictions in rain and isolated to
scattered thunderstorms throughout this period.

Rip Currents...

For Thursday, southwest winds around 5-10 mph turning south in
the afternoon behind a sea breeze. Breaking wave heights of 1-3
feet with a weak southeasterly swell of 1 foot around 9 seconds.
We will be a few days removed from the Full Moon from Tuesday
night, therefore expecting to see less of an impact to tides as
a result. We have a LOW risk for dangerous rip currents at all
beaches.

For Friday, east-northeast winds around 5-10 mph turn more
easterly in the afternoon. Breaking wave heights remain around
1-3 feet with a weak southeasterly swell of 1 foot around 9
seconds. No major differences from Thursday, so we will maintain
a LOW risk for dangerous rip currents at all beaches.

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

&&

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

&&

$$

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