Upper Darby, Pennsylvania 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

460
FXUS61 KPHI 021028
AFDPHI

Area Forecast Discussion
National Weather Service Mount Holly NJ
628 AM EDT Mon Jun 2 2025

.SYNOPSIS...
High pressure gradually shifts offshore through midweek.
Temperatures will warm each day, with above normal temperatures
expected by Wednesday and Thursday. Conditions will remain dry
through Wednesday, then a more unsettled pattern will take shape
starting Thursday, and especially by Friday and Saturday with
increasing chances for showers and thunderstorms.

&&

.NEAR TERM /THROUGH TONIGHT/...
High pressure will shift more squarely overhead Monday, bringing
dry conditions through the day. Temperatures will warm into the
low to mid 70s, still about 5 degrees below climo. Nighttime
lows will fall into the upper 40s to mid 50s. Winds will remain
light out of the WNW during the day, becoming variable
overnight.

While Monday will be mostly cloud-free and dry, our daytime
sunshine could be a tad hazy due to smoke aloft from Canadian
wildfires, especially towards the late afternoon and evening
hours headed towards sunset. Thankfully, we do not expect the
smoke to reach the ground and cause any air quality issues at
the surface at this time.

&&

.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
The early to midweek period will experience a warming
temperature trend and dry weather as high pressure inches
offshore, bringing a warm southwest flow across the region.
Temperatures will quickly trend to above normal, with highs near
80 degrees Tuesday and into the mid 80s by Wednesday. Lows
ranging from the mid to upper 50s Tuesday night and likely not
cooling below 60 Wednesday night.

A strong upper level ridging pattern will help keep conditions
dry Tuesday and Wednesday.

&&

.LONG TERM /THURSDAY THROUGH SUNDAY/...
A more unsettled weather pattern will begin to take shape late
week and into the early part of the weekend. The strong upper
level ridging pattern across the eastern US will begin weakening
Thursday as a weak troughing pattern takes hold across the Great
Lakes region and eventually move into the northeastern US
towards the end of the week.

Surface high pressure will drift further offshore, but continue
warm southwest flow across the region. The warmest day of the
week still appears to be Thursday with widespread upper 80s and
even a few 90s! Thursday should remain mostly dry, save for
possibly near/north of I-78. The more unsettled weather arrives
Friday and Saturday as a low out of the Great Lakes moves into
the Northeast with a cold front moving across the Mid Atlantic.
There still remains a bit of differences in the exact details
and timing across global guidance, but the general consensus
places rain chances for Friday and Saturday. Another warm day
Friday with mid to upper 80s, but increased cloud coverage is
expected to keep temperatures a few degrees cooler than
Thursday. Low to mid 80s can be expected for Saturday ahead of
the cold front. By Sunday, high pressure is expected to build
back in with seasonable temperatures behind the frontal passage.

&&

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

Monday...VFR and clear skies. Northwest winds around 5-10 kt.
High confidence.

Monday night...VFR. Winds light and variable.

Outlook...

Tuesday through Thursday...VFR.

Friday...Sub-VFR possible in scattered showers/storms.

&&

.MARINE...
No marine headlines are in effect through Monday night. Winds
generally 10 kts or less. Seas of around 2 feet. Fair weather.

Outlook...

Tuesday thru Wednesday...Sub-SCA with fair weather.

Thursday and Friday...SCA conditions possible. SSW winds
gusting to around 20 kts. Showers and storms possible on Friday.

Rip Currents...

For Monday...Northwest winds around 5-10 mph in the morning,
will become southerly in the afternoon. Breaking waves around
1-2 feet with a period of 6-7 seconds. As a result, there is a
LOW risk for dangerous rip currents for all beaches.

For Tuesday...West winds around 5-10 mph in the morning, will
become southerly in the afternoon. Breaking waves around 1-2
feet with a period of 7-8 seconds. As a result, there is a LOW
risk for dangerous rip currents for 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...MJL
NEAR TERM...MJL
SHORT TERM...MJL
LONG TERM...MJL
AVIATION...MJL
MARINE...MJL