Dover, Delaware 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

036
FXUS61 KPHI 212331
AFDPHI

Area Forecast Discussion
National Weather Service Mount Holly NJ
631 PM EST Sun Dec 21 2025

.SYNOPSIS...
Canadian high pressure will build into the region into tonight.
High pressure will move offshore Monday night, then a clipper
system will push a warm front into the area early Tuesday. The
system`s cold front is then forecast to move across the area
Tuesday night into early Wednesday, followed briefly by high
pressure late Wednesday. A pair of weak disturbances could then
affect the area for the end of next week.

&&

.NEAR TERM /THROUGH MONDAY/...
Canadian high pressure exits out of the Ohio Valley tonight,
building east into the Mid-Atlantic region. This will result in
clear skies with winds diminishing to around 5-10 mph overnight.
Winds may remain elevated enough to prevent exceptional
radiational cooling conditions, but nonetheless, expect low
temperatures to fall into the teens to mid 20s. Wind chills will
mainly be in the teens with single digits across the Pocono
Plateau.

For Monday, high pressure will remain in control while located
over the Mid-Atlantic before shifting offshore late in the day.
Mostly sunny skies are expected with only an increase in mid-
high level clouds in the afternoon as the next disturbance
approaches. Temps will be a few degrees below average, with
highs ranging in the mid 30s to mid 40s.

&&

.SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/...
Main focus of the short term is the weak clipper-like system
moving in from the northwest Monday night into Tuesday. Guidance
is still a bit unsure just how far south wintry precip makes
it, and the 12Z suite seems to have pulled back a little further
north ever so slightly, so no significant changes were made to
the forecast. Still expect some light snow to overspread
northern areas, possibly reaching as far south as Philly, later
Monday night with temps mostly near freezing or below. Then,
warm front lifting north during the morning should allow temps
to rise above freezing region-wide, with 40s for afternoon highs
for most. Any precip by this point should be rain, but any
significant precip likely ends by midday or so. Still looks like
the best odds for an inch are fare N NJ and the Poconos, with a
coating more likely in the I-78 corridor, and possibly a small
accumulation down to Philly itself. Worst case scenario would be
to add an inch to these, but this still looks unlikely overall.
Best chance of an advisory appears to be the Poconos, but with
a criteria of 3 inches, this still looks like a long short. One
other possibility which could occur is a little freezing rain
which may develop as the precip transitions from snow to rain.
This would most likely affect the Poconos, though can`t rule it
out in the I-78 corridor, and any freezing rain WOULD likely
necessitate an advisory.

Rest of the short term is pretty quiet, with just some
lingering clouds Tuesday night behind the clipper along with a
bit of a breeze and temps actually looking more likely to stay
above freezing in much of the region.

For Wednesday (Christmas Eve), weak high pressure returns and
we should see diminishing winds and clouds with most areas again
in the 40s for highs, 30s Poconos and 50s southern Delaware.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
High pressure will linger Wednesday night (Christmas Eve night)
with some radiational cooling early before clouds roll in later
on ahead of another weak clipper-like system, even weaker than
its predecessor. Still have some chance or slight chance POPs
late at night but this system appears to be trending later and
also further southwest, which could mean it mostly misses us. If
precip does arrive before dawn, there could be a little wintry
weather, but temps should rise quickly above freezing on
Thursday morning (Christmas), changing whatever is falling to
rain. Highs likely end up mostly in the 40s again... a
relatively seasonable Christmas.

Clouds likely hold temps up on Thursday night (Christmas night),
with many areas staying above freezing again. Then a stronger low
pressure looks likely to pass to our north, bringing a surge of
warmth ahead of it but also some light rain or showers. Thus, Friday
looks likely to be both the warmest and wettest day of the forecast
period. Highs have trended back upward, near 60 for Philly and
points south, 50s most elsewhere.

Some rain may linger Friday night depending on how fast the system
moves, but cold advection should resume as it departs, and Saturday
now looks more seasonable but also dry as high pressure returns.
Highs again mostly 40s.

Another low pressure then moves through the Great Lakes by Sunday,
with a cold front pushing in our direction once again. This will
definitely increase the rain chances a bit for the second day of
2025`s last weekend, and may also nudge temps up too, but dind`t
push them up much just yet, still mostly 40s but a little milder
than Saturday.

&&

.AVIATION /00Z MONDAY THROUGH FRIDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.

Tonight...VFR/SKC. Northwest winds around 10-15 kt with gusts up
to 20 kt through around 0Z will diminish and become westerly
around 5-10 kt overnight. High confidence.

Monday...VFR. Clear skies in the morning, giving way to SCT
mid-high level clouds in the afternoon. West winds around 5-10
kt in the morning, settling out of the southwest in the
afternoon. High confidence.

Outlook...

Monday night into Tuesday, a period of sub-VFR, possibly IFR,
conditions may occur as some snow and rain move into the region.
Most likely affected terminals are ABE, RDG/TTN, PNE in that
order. Conditions likely improve to at least MVFR later Tuesday,
but may linger at MVFR thru Tuesday night. VFR likely return
Wednesday, but another chance of rain may bring sub-VFR
conditions at times Thursday into Friday.

&&

.MARINE...
The Small Craft Advisory for the Delaware Bay is in effect until 1
AM Monday. The Small Craft Advisory for the Atlantic Coastal Waters
is in effect until 6 AM Monday.

Northwest winds around 15-25 kt with gusts up to 30 kt are expected
to continue into this evening, before gradually beginning to
diminish after midnight. Seas of 3-5 feet. Fair weather.

For Monday, northwest winds around 10-20 kt in the morning, will
become southwest winds around 10-15 kt in the afternoon. Seas of 2-4
feet. Fair weather.

Outlook...

Mainly sub-Small Craft Advisory Monday night, but SCA conditions
likely develop Tuesday morning and continue at times through
Wednesday. Mainly sub-SCA conditions return Wednesday night through
Thursday night before another shot of SCA conditions may return
Friday.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...Small Craft Advisory until 1 AM EST Monday for ANZ430-431.
     Small Craft Advisory until 6 AM EST Monday for ANZ450>455.

&&

$$

SYNOPSIS...RCM/Staarmann
NEAR TERM...DeSilva
SHORT TERM...RCM
LONG TERM...RCM
AVIATION...DeSilva/MPS/RCM
MARINE...DeSilva/RCM