Rehoboth, Delaware Weather Forecast Discussion

996
FXUS61 KPHI 211014
AFDPHI
Area Forecast Discussion
National Weather Service Mount Holly NJ
614 AM EDT Sun Sep 21 2025
.SYNOPSIS...
High pressure will be in control today before shifting offshore
on Monday. A warm front will pass through the region on Monday
as well, before a cold front gradually tracks through the area
on Wednesday. This front will then stall over the Mid-Atlantic
region through the end of the week into next weekend, causing a
period of unsettled weather.
&&
.NEAR TERM /THROUGH TONIGHT/...
High pressure remains in control today and into tonight. The
high pressure system does start to shift to the east but will
continue to lead to dry conditions during the near term period.
Winds will generally be out of the east today which will lead to
an onshore flow with low clouds present for at least the first
half of the day. These clouds do start to break apart during the
afternoon with conditions trending mostly sunny. Highs today
are in the 70s. Overnight, we continue to deal with a bit of
onshore flow which has the potential to lead to some more low
clouds, especially for the coastal areas. Elsewhere, it looks to
be mainly mostly clear. Lows tonight are in the upper 40s to
upper 50s.
&&
.SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/...
A more active pattern starts to take shape this week, but at
least for Monday, quiet weather should prevail one more day.
We`ll remain under the influence of a waning area of high
pressure which will be weakening and moving out to sea, but
while clouds may be more common, dry conditions should prevail.
Highs will be around 80 inland, closer to 70 coast and higher
elevations.
Cold front approaching from the northwest will bring more cloud
cover for Monday night, but dry conditions still look likely to
prevail. Lows will be within a few degrees either side of 60 for
most.
Front finally has more of an impact on Tuesday as it continues
slowly moving in from the northwest. While the morning still
looks dry, increasing risk of showers and perhaps even a few
thunderstorms develops during the afternoon, especially
northwest of I-95. Southwesterly flow ahead of the front should
provide plenty of warm advection, bumping most area into the
low-mid 80s, 70s at the coast and Poconos.
Front slowly slinks across the area Tuesday night, with chance
of showers over the whole region, but with waning insolation
they may be on the overall decline. Lows low-mid 60s for most,
except 50s Poconos.
&&
.LONG TERM /WEDNESDAY THROUGH SATURDAY/...
The front will stall for a time over the region Wednesday before
a wave of low pressure shifts it further south and east Thursday
into Friday, but another wave may then ride northeast along the
front for Saturday. Timing on these impulses is not great this
far out, but certainly the risk of showers will persist through
the entire long term. Depending on exact evolution, there could
be one or more intervals of heavier rain in parts of the
region, but confidence on this is even lower. Temps will mostly
be in the 70s for highs and 60s for lows, the range diminished
thanks to the clouds and showers expected.
&&
.AVIATION /10Z SUNDAY THROUGH THURSDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
Today...MVFR CIGs at KILG/KRDG in the morning, then VFR. VFR
for all the other terminals. E to SE winds 5 to 10 kt. Moderate
confidence.
Tonight...VFR. E to NE wind around 5 knots. High confidence.
Outlook...
Mainly VFR Monday and Monday night with dry conditions. By
Tuesday, showers may arrive with some sub-VFR conditions, and
this risk continues occasionally through Thursday.
&&
.MARINE...
Wind gusts will continue to subsided through today. SCA flags
will continue for most of the ocean zones with seas reaching 5ft
today and continuing into tonight. Fair weather through
tonight.
Outlook...
SCA flag continues into Monday but its very marginal and only
for ocean waves. While the headline ends Monday afternoon,
occasional ocean waves of 5 feet may persist at times Monday
night through Thursday, with showers also possible starting
Tuesday night and continuing through Thursday.
Rip Currents...
For today, east-northeast winds are around 15 to 20 mph which
decrease throughout the day. Breaking wave heights increase to
around 3 to 4 feet. Slightly larger easterly swell increasing to
around 2 feet at around 6 seconds in length. Some wave guidance
has a secondary long period (12 to 14 second) swell arriving
tomorrow. With greater wave heights, onshore flow, and multiple
swell groups (one of which being a long period swell), a HIGH
risk of rip currents are expected for today. Given that we are
late in the season, and not many beaches are guarded this time
of year, please exercise caution if at the beaches today.
For Monday, winds start out east-northeast but become more
southeasterly by the late afternoon and much lighter at around
10 MPH. Breaking wave heights hold at around 3 to 4 feet.
Slightly larger easterly swell increasing to around 3-4 feet at
around 8-9 seconds in length. Some wave guidance continues to
show the secondary long period (11 to 12 second) swell for
tomorrow. Due to breaking wave heights holding, onshore flow
lasting for a longer period of time, and multiple swell groups
(one of which being a long period swell), a HIGH risk of rip
currents are expected for Monday.
For specific beach forecasts, visit weather.gov/beach/phi
&&
.TIDES/COASTAL FLOODING...
Onshore flow weakens today, and while levels will remain
elevated, no tidal flooding is expected for a couple more days.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...High Risk for Rip Currents through this evening for NJZ014-024>026.
DE...High Risk for Rip Currents through this evening for DEZ004.
MD...None.
MARINE...Small Craft Advisory until 2 PM EDT Monday for ANZ451>453.
     Small Craft Advisory from 2 PM this afternoon to 2 PM EDT
     Monday for ANZ454-455.
&&
$$
SYNOPSIS...Guzzo/RCM
NEAR TERM...Guzzo
SHORT TERM...RCM
LONG TERM...RCM
AVIATION...Guzzo/RCM
MARINE...Guzzo/RCM
TIDES/COASTAL FLOODING...

NWS PHI Office Area Forecast Discussion