Wyomissing Hills, Pennsylvania Weather Forecast Discussion

198
FXUS61 KPHI 082153
AFDPHI
Area Forecast Discussion
National Weather Service Mount Holly NJ
553 PM EDT Mon Sep 8 2025
.SYNOPSIS...
High pressure shifts eastward into tonight and become centered
more into New England. An area low pressure off the Southeast
U.S. coast tracks north and northeastward Tuesday through
Wednesday. A weak cold front may cross the area later Thursday,
then high pressure builds in from the north Friday through the
weekend.
&&
.NEAR TERM /THROUGH TUESDAY/...
A sunny and cool afternoon continues. Breezy northeast winds with
gusts of 15-20 mph will diminish towards sunset tonight.
High pressure overspreads the Northeast tonight, bringing mostly
calm winds and clear skies. Cool temperatures expected tonight with
lows in the 40s to low 50s. There is a good chance we will see
temperatures cool off even below that, reaching very close to 40, in
areas away from the urban centers due to some strong radiational
cooling in well-sheltered areas. However, temperatures are NOT
expected to get cool enough to warrant a concern for patchy frost.
Locations closer to the coast may stay closer to the forecast (mid
50s) with some more high clouds expected south and east.
High pressure will maintain its hold on the region Tuesday, keeping
conditions mostly cool and dry once again. Highs will stay in the
low to mid 70s with ENE flow around 10 mph with a few gusts around
15-20 mph once again. Clouds will increase along the coast and
gradually fill in further inland through the afternoon as a weak
coastal low begins to take shape along a stalled frontal boundary
located just offshore. Most locations will remain dry through
Tuesday afternoon, though cannot fully rule out a stray light shower
along the immediate coast.
&&
.SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY NIGHT/...
Our tranquil weather comes to an end in the short term period as a
low pressure system develops off the southeast coast and moves north
to eventually northeast. The current forecast keeps the low
offshore. In the upper-levels, there will be troughing across the
region along with some upper-level forcing to help develop the
low, but at this time, it does not look to deepen much and
stays on the weaker side.
As this low pressure system develops and moves north Tuesday night
into Wednesday, we see showers move in and even the potential for
isolated thunderstorms. For this precip, there is a slight chance
for showers near and just east of the I-95 corridor with chance PoPs
closer to the coastal areas of New Jersey and parts of Sussex county
Delaware. In those latter areas, an isolated thunderstorm is also
possible. Coverage of any showers looks to be isolated to scattered
Tuesday night through Wednesday night. There is a signal on some
model guidance for some fgen forcing Tuesday night which may lead to
better development of precipitation.
Another factor with this low pressure system is the increase in
winds. A high pressure system will be north to northeast during this
timeframe and the low pressure system moving north to eventually
northeast will lead to a tightening pressure gradient. Winds will be
out of the northeast at generally 5-10 mph for most of the area and
gusts will be 15-20 mph which look to peak during the day Wednesday.
The exception of this is the marine zones and the coastal areas. For
the coastal areas, sustained winds up to 15 mph with gusts 20-30 mph
are forecasted. The highest gusts currently look to be Tuesday night
into Wednesday morning. This northeast wind will also keep
temperatures on the cooler side with highs in the upper 60s to low
70s on Wednesday.
By Thursday, our coastal low departs and we trend drier. Clouds
decrease through the day Thursday which leads to more sunshine.
Temperatures also turn milder Thursday with highs in the mid to
upper 70s. There will also be less wind on Thursday as the pressure
gradient lessens. We will still have notable upper-level troughing
across the region Thursday with a signal for a weak cold front late
Thursday into Friday but it looks to lack a lot of moisture, so
there are no shower chances currently.
&&
.LONG TERM /FRIDAY THROUGH MONDAY/...
Tranquil weather looks to be the case through the long term period
as an expansive surface high builds into the region. This keeps us
dry and allows for a decent amount of sunshine into the weekend.
Highs each day are mainly in the 70s with not much in the way of
humidity.
In the upper-levels, troughing remains in place with some of the
troughing becoming closed off to the south of our area due to a
piece of shortwave energy moving through. Some models show a
signal for an upper-level low trying to take shape by the end of
the long term period and into the beginning of next week which
may lead to more unsettled weather. There is quite a degree of
uncertainty given the timing of this in the long term period, so
stuck with the NBM which keeps us dry.
&&
.AVIATION /21Z MONDAY THROUGH SATURDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
Rest of today...VFR/SKC. NE winds 7 to around 10 kt with some gusts
up to 15 to 20 kts. High confidence.
Tonight...VFR. E-NE winds less than 5 kt. High confidence.
Tuesday...VFR with some increasing clouds. NE to ENE winds 5-10
knots, however increasing to 10-15 knots with some gusts to 20
knots. High confidence.
Outlook...
Wednesday...Generally VFR, however a period of sub-VFR
conditions possible at the I-95 terminals and especially KMIV/KACY
due to low clouds and some showers. Northeast winds 5-10 knots.
Thursday and Saturday...VFR.
&&
.MARINE...
Small Craft Advisory in effect for coastal waters from Manasquan
Inlet, NJ to Fenwick Island, DE due to seas 3-5 feet and gusty
northeast winds up to 25 kts. SCA conditions will persist through
the afternoon, before possibly easing briefly below SCA criteria
this evening into the first half of tonight. Winds and seas will,
however, ramp back up early Tuesday morning. Northeast winds 25 kts
with gusts up to 30 kts on Tuesday with seas building to 5-7 feet
after daybreak Tuesday and into the rest of the day.
Outlook...
Wednesday...A pressure gradient tightens with high pressure to
the north and low pressure to our south and then east. This will
increase a northeasterly wind with gusts 25-30 knots at times
along with seas building to 6-8 feet. A Small Craft Advisory
has been issued for all ocean zones through the day Wednesday.
The winds diminish quicker Wednesday night than the seas, so an
extension of the Small Craft Advisory on the ocean zones into
Thursday morning may be needed if the trend holds.
Thursday and Friday...The conditions are anticipated to be below
Small Craft Advisory criteria.
Saturday...Small Craft Advisory conditions possible with seas
near or at 5 feet.
Rip Currents...
On Tuesday, northeast winds increase to 15-20 mph with some
gusts up to 30 mph. This will result in breaking waves in the
surf zone building to 3-5 feet, and with a southeasterly swell
with a 6-7 second period and Sunday`s Full Moon being within two
days, I opted to go with a HIGH risk for the development of
dangerous rip currents at all beaches.
For Wednesday, northeast winds continue at 15-20 mph with some
gusts up to 30 mph. This will result in breaking waves in the
surf zone still at 3-5 feet, and with a southeasterly swell
with a 7-8 second period, so I opted to go with a HIGH risk for
the development of dangerous rip currents at all beaches. A Rip
Current Statement has been extended to include Wednesday now.
For specific beach forecasts, visit weather.gov/beach/phi
&&
.TIDES/COASTAL FLOODING...
A prolonged period of northeasterly winds will continue into
Tuesday and Wednesday. As the winds increase into Tuesday and
hold their intensity on Wednesday, we see the potential for
minor coastal flooding at most of our tidal gauges with the
exception being the Chesapeake Bay. Right now, the best
potential for this minor coastal flooding looks to be with the
high tide cycles starting mainly later on Tuesday and
continuing with the high tide cycles on Wednesday. The current
forecast trended lower compared to the previous one and given
the timing of any potential flooding, no Coastal Flood
Advisories have been issued at this time. Trends will continue
to be monitored and Coastal Flood Advisories may be issued with
a future update.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...High Risk for Rip Currents through Wednesday evening for NJZ014-
     024>026.
DE...High Risk for Rip Currents through Wednesday evening for DEZ004.
MD...None.
MARINE...Small Craft Advisory from 6 AM to 10 PM EDT Tuesday for ANZ430-
     431.
     Small Craft Advisory from 6 AM Tuesday to 6 PM EDT Wednesday
     for ANZ450.
     Small Craft Advisory until 6 PM EDT Wednesday for ANZ451>455.
&&
$$
SYNOPSIS...Gorse/Guzzo
NEAR TERM...MJL
SHORT TERM...Guzzo
LONG TERM...Guzzo
AVIATION...Guzzo/MJL
MARINE...Guzzo/MJL
TIDES/COASTAL FLOODING...PHI

NWS PHI Office Area Forecast Discussion