Forecast Discussion From Mount Holly
438
FXUS61 KPHI 230528
AFDPHI
Area Forecast Discussion
National Weather Service Mount Holly NJ
1228 AM EST Sat Nov 23 2024
.SYNOPSIS...
Low pressure will linger across the Middle Atlantic region
through tonight. The low will then move away through the weekend.
Weak high pressure arrives for later Sunday and Monday, followed
by a cold front Monday night into Tuesday. A low pressure system
may affect the area around the Thanksgiving Day timeframe.
&&
.NEAR TERM /THROUGH TODAY/...
For the majority, precipitation has come to an end however,
there still remains a few areas of light rain/snow showers
pinwheeling around the surface low. These should wind down
through the early morning hours and all precipitation should
cease by daybreak.
As the surface low gradually rotates back offshore, despite
winds shifting to the northwest, it will take some time for
drier air to filter into the region, so there will be patchy fog
developing across the region. Winds will stay elevated and it
will remain relatively cloudy, so have lows mostly above
freezing except in the Poconos and NW NJ.
For Saturday, the low continues to pull away from the area as
it moves into the Canadian Maritimes. This should help bring us
at least some partial sunshine, especially south. Highs will
rebound around 10 degrees from today, though again, with the
gusty wind it will feel cooler. Generally expect NW winds 15 to
20 gusting up to 30 mph at times.
&&
.SHORT TERM /TONIGHT THROUGH MONDAY/...
A dry period from Sat night into Monday. While upper heights build
along the East coast, a surface ridge will extend across the
Middle Atlantic region. Skies will be partly to mostly sunny
both Mon/Tue with perhaps a few clouds increasing later Tue
afternoon. Temperatures both days will be a little above normal
with highs in the mid/upper 50s across Delmarva, metro Philadelphia
and south NJ. For the southern Poconos and north NJ, highs will
be close to 50 degrees. Lows Sun night will be in the upper 30s
to low 40s for the metro and Delmarva areas and low/mid 30s for
rural spots.
&&
.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
We`ll start the long term with the last of the mild air across the
region being swept away with a cold front passage. The low pressure
system associated with the front will be across southern Canada and
will be tracking down the St. lawrence Valley. Pops will continue to
be in the high-chance/low-likely range for now with the higher
chances to the north/west. Temperatures look too mild for any snow
attm. Lows Mon night will be in the 40s with some upper 30s far N/W.
Following that, for the Tue-Wed periods we`ll have dry conditions as
high pressure builds over the area. Temperatures will still be above
normal Tue as the cold advection doesn`t really kick in until later
in the day. By Wed. readings will have dropped back to a little
below normal with highs in the upper 40s N/W and low 50s elsewhere.
The high pressure area weakens and then moves offshore Wed night, so
while dry weather should continue overnight, clouds will increase
overnight as another low develops across the lower Ohio Valley and
begins to track east. This new system will bring chances for
precipitation for Thursday and Thursday night across the area. It
appears to be a rain event attm with some snow across the southern
Poconos and north NJ. The low will strengthen as it moves offshore,
so there is some potential for precipitation to continue into Friday.
&&
.AVIATION /05Z SATURDAY THROUGH WEDNESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.
Through 12Z...A mixture of MVFR/IFR ceilings expected with
rain/snow showers ending by 06-08Z from west to east. Some low
clouds may linger through about 09Z before improving. W to NW
winds around 10 kt with occasional gusts up to 15 kt. Moderate
confidence.
Today...Lingering MVFR ceilings should improve to VFR by 13Z
and remain VFR through the day. W to NW winds around 15-20 kt
with occasional gusts up to 30 kt. Moderate confidence.
Tonight...VFR expected to continue. W winds around 10-15 kt.
High confidence.
Outlook...
Sunday through Monday...VFR expected.
Monday night...sub-VFR conditions possible with light rain
expected.
Tuesday through Wednesday...VFR expected.
&&
.MARINE...
With a strong northwest flow over the waters tonight through
Saturday, will go ahead and extend the Gale Warning through
Saturday for Delaware Bay. Winds/seas remain elevated through
Saturday. Will continue to see some marginal Gale conditions at
times for our southern waters off the coast of southern NJ, DE,
and the DE Bay. Farther north, the winds should stay below
Gale. For Saturday, Gales will develop on all waters.
Outlook...
Saturday night through Sunday...Small Craft Advisory criteria
conditions expected. West to northwest winds 20-25 kts with gusts up
to 30 kts and seas 3-6 feet. Gale force wind gusts may linger into
the first half of Saturday night, most likely south of Great Egg
Inlet.
Sunday night through Monday night...sub-SCA expected. Fair except
for a few showers possible Mon night.
Tuesday... SCA possible. Fair weather.
&&
.CLIMATE...
Driest autumn (Sep-Nov) on record, and any 3-calendar month
period on record, plus current status:
9/1-11/21 Driest Driest 3 Year/
Site 2024 precip Autumn Year Calendar months months
Allentown (ABE) 2.60 3.81 1922 3.58 Oct-Dec 1928
A.C. Airport (ACY) 2.17 3.34 2001 2.35 Oct-Dec 1946
A.C. Marina (55N) 1.58 2.89 1941 2.52 Aug-Oct 1895
Georgetown (GED) 1.17 2.67 2001 2.20 Aug-Oct 2024
Mount Pocono (MPO) 4.25 4.21 1931 3.36 Oct-Dec 1928
Philadelphia (PHL) 1.98 2.37 1922 2.37 Sep-Nov 1922
Reading (RDG) 2.20 2.89 1922 2.89 Sep-Nov 1922
Trenton (TTN) 1.86 3.18 1922 2.66 Jun-Aug 1966
Wilmington (ILG) 1.61 3.17 1922 3.17 Sep-Nov 1922
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...Gale Warning until 6 PM EST this evening for ANZ430-431-
452>455.
Small Craft Advisory until 6 AM EST early this morning for
ANZ450-451.
Gale Warning from 6 AM this morning to 6 PM EST this evening
for ANZ450-451.
&&
$$
SYNOPSIS...Fitzsimmons/RCM
NEAR TERM...DeSilva/Fitzsimmons/MPS/RCM
SHORT TERM...OHara
LONG TERM...OHara
AVIATION...DeSilva/Fitzsimmons/MPS/OHara
MARINE...Fitzsimmons/MPS/OHara
CLIMATE...
NWS PHI Office Area Forecast Discussion
