Today:
Mostly sunny, with a high near 58. Northeast wind 5 to 10 mph.
Tonight:
Partly cloudy, with a low around 34. Southeast wind 0 to 5 mph.
Friday:
Sunny, with a high near 63. Southeast wind 0 to 5 mph.
Friday Night:
Partly cloudy, with a low around 39. Southeast wind 5 to 10 mph.
Saturday:
Mostly cloudy, with a high near 61. Southeast wind 5 to 15 mph.
Saturday Night:
Mostly cloudy, with a low around 47.
Sunday:
Partly sunny, with a high near 78.
Sunday Night:
Partly cloudy, with a low around 58.
AREA FORECAST DISCUSSION
National Weather Service Mount Holly NJ
630 AM EDT Thu Apr 25 2024
Weather Synopsis:
High pressure arrives from the Great Lakes today before
shifting to our northeast and east on Friday. A warm front
should lift north of our area later Saturday, then a cold front
gradually approaches later Monday before moving across our area
later Tuesday.
Near Term:
THROUGH TONIGHT -
Latest analysis shows the cold front has cleared the region,
but between wind being relatively weak behind the front plus
some lingering clouds, temps have been slow to drop. Have
trimmed back the frost advisory for a large segment and
cancelled the freeze warning for all zones.
Weak shortwave passing by this morning likely keeps some clouds
around from Philly on southward for a good chunk of the day, and
in fact there could be a stray shower, most likely over the
Delmarva but a small chance even in southern NJ. Looks like any
showers would end before noon, and we should gradually start to
dry out and clear out more late in the day. While the cold
advection has lagged, still expect today to be notably cooler
than yesterday, with highs mostly in the 50s.
High pressure builds to the north tonight with the gradient
slacking off enough. With drier air in place by then along with
clear skies, expect radiational cooling to maximize. Thus, have
leaned hard on the colder guidance and issued a freeze watch for
a large chunk of the region especially north and east of
Philadelphia. Areas further south and west look more tricky but
still likely need frost advisories for these areas. Lows overall
in the 30s, with near or below 30 in the Freeze Watch area and
Poconos but closer to mid 30s in the urban centers and Delmarva.
Short Term:
FRIDAY THROUGH SATURDAY NIGHT -
An upper-level trough is forecast to shift to our east to start
Friday, allowing high pressure to build across New England and
the Mid Atlantic. After a cold start Friday morning, surface
flow shifts south- southeast by the afternoon to allow some
warming to begin. With mostly clear skies, high temps in the
afternoon should reach low 60s inland. Onshore flow, however,
will help keep the coastal communities and adjacent inland
locations in the mid to upper 50s during the afternoon. Calm
winds and clear skies to start the nighttime hours will aid in
cooling, but increasing clouds overnight will help stave off
runaway radiational cooling. We will still see temperatures
dip into the mid 30s to low 40s with patchy frost possible in
the most sheltered areas.
High pressure shifts offshore Saturday with an approaching warm
front, expected to arrive around the evening timeframe. Winds
will become more southerly with return flow of our offshore high
aiding in the warm air advection we can expect as the warm front
pushes through. That said, the increased cloud coverage will
prevent us from warming up too much, with afternoon highs
expected to reach the upper 50 to low 60s, right around or just
warmer than on Friday. While a few showers cannot be ruled out
with this warm front probabilities and coverage remain rather
minimal with the only mentionable POPs north and west of I-78.
Warmer overnight with the warm front passing through and cloud
coverage preventing much radiational cooling. Lows will be in
the mid to upper 40s.
Long Term:
SUNDAY THROUGH WEDNESDAY -
High pressure shifts to our south, allowing southwest flow to
really crank up the warm air advection across the region. Sunday
and Monday will look to bring some of the warmest temperatures
we have seen thus far this season with mid to upper 70s on
Sunday and low to mid 80s by Monday afternoon! Mostly dry across
the region during this timeframe as well, though a few isolated
showers or a rumble of thunder cannot be ruled out mainly across
the Poconos where the aforementioned warm front may linger
nearby.
The stacked low shifting across the upper Midwest will slowly
move into central Canada Monday into Tuesday, dragging along a
cold front across the Ohio River Valley and eventually through
the Mid Atlantic. This is where our next best chance for
precipitation will come from and will be highly dependent on the
timing of this low and its associated cold front. At the moment,
some showers will be possible Monday night as the front
gradually approaches the region, but the best chance for
showers and thunderstorms will come Tuesday as the cold front,
washing out at this point, finally arrives. Temperatures remain
warm again Tuesday with upper 70s to low 80s. Not much cooler
behind this weak cold front on Wednesday, however, with a
surface high ridging in from the southeastern US to keep things
on the mild side in the 70s.
Click for full NWS PHI Office Area Forecast Discussion
