Catonsville, Maryland 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

351
FXUS61 KLWX 160101
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
901 PM EDT Tue Apr 15 2025

.SYNOPSIS...
A strong area of low pressure will track across southeastern
Canada and northern New England into Wednesday. High pressure
will build into the area for Thursday and Friday. A cold front
will approach from the north and west this weekend before
settling to the south by early next week.

&&

.NEAR TERM /THROUGH WEDNESDAY/...
Wind Advisories have been allowed to expire aside for the
Alleghenies where they will continue through daybreak. Most
showers have tapered off. However, incoming shortwave supports
continued precipitation across the Allegheny front overnight
with some spilling east based on elevated FROUDE number. IN the
Alleghenies, snow is likely the primary precipitation type,
especially above 2500ft after 06Z. The snow squall parameter
remains elevated, so brief reductions in visibility with
coatings of snow are possible. In terms of total snowfall
amounts, generally a coating to inch for most, with up to 3
inches on the highest ridge tops.

Low temperatures tonight will fall into the mid 20s to low 30s
across the mountains, with upper 30s to mid 40s elsewhere. While
winds diminish in strength, wind chills do fall into the teens
along the Allegheny Front.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/...
Some of the mentioned upslope snow showers may persist into the
first half of the morning along the Alleghenies. However, any
snow on the ground should quickly melt owing to the mid-April
solar insolation angle. For the remainder of the area, expect a
greater deal of sunshine compared with today/Tuesday. This does
come with an additional round of gusty westerly winds in
response to further shortwave passages aloft. The current
forecast package calls for wind gusts up to around 30 to 35 mph,
locally nearing 45 mph over the mountains. Some of the guidance
brings such locations to near Wind Advisory criteria again, so
will continue to monitor. High temperatures should be below
average, generally running in the mid 50s to low 60s (40s for
mountain locales). Winds diminish into Wednesday night as high
pressure approaches from the Tennessee Valley. Forecast lows
fall into the 30s to low 40s. This may cause some frost and
freeze issues where the growing season has commenced.

For Thursday, the day will start off sunny in response to the
surface anticyclone. Winds should be light and variable in
nature as this dome of high pressure pushes through before
sliding offshore by late Thursday. Forecast highs are in the
low/mid 60s, with 50s over the mountains. Mid to high clouds
increase during the evening and night as a slow moving warm
front tracks from the Ohio Valley. Any shower activity with this
moisture surge should stay off to the north and west.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
A warm front lifts through the region on Friday as high
pressure pushes offshore, giving way to temperatures well into
the 70s across the region once again. Many spots may even
approach the low 80s, especially in central VA.

An upper-level ridge builds overhead Saturday into Sunday. A cold
front will then approach the area Saturday afternoon and bring the
threat of showers and possible t-storms Sat afternoon and evening,
mainly in western portions of the region. Thinking that the front
may have trouble getting this far east, but guidance is somewhat
split, so going with chance POPs for now. High temperatures will
rise into the 80s area-wide.

The aforementioned front will then sink south of the fcst area late
Sat night, with high pressure will build over the area on Sunday.
This will drop temperatures back down into the 70s.

Another weak low pressure system may impact the area early next week
bringing a small chance of showers and perhaps even some
thunderstorms.

&&

.AVIATION /01Z WEDNESDAY THROUGH SUNDAY/...
VFR conditions overnight with winds dropping to 15 to 20 knots.

Wednesday will yield more sunshine, but with another round of
gusty west-northwesterly winds topping out around 25 to 30
knots. Expect winds to drop off into the night as high pressure
approaches from the Tennessee Valley. VFR conditions are
expected both Wednesday and Thursday, but with much lighter
winds during the latter of the two days.

Southwest winds will gust to around 20 to 25 knots on Friday
afternoon before gradually diminishing on Saturday and turning out
of the southwest.

Winds Saturday night into Sunday really taper off as high pressure
returns to the region.

&&

.MARINE...
Wind gusts have drop to 20 to 25 knots which has transitioned
the Gale Warning to Small Craft Advisories for all waters.

While dry, Wednesday will also bring another round of gusty
winds to the area. These west-northwesterly winds may gust to
around 25 to 30 knots through the day before dropping off
through the night. High pressure arrives on Thursday which
brings sub-advisory caliber winds with it.

A prolonged period period of southerly flow will lead to channeling
up the Chesapeake Bay Friday into Saturday. SCAs are likely during
this time.

High pressure over the region on Sunday should bring winds back
below SCA criteria.

&&

.TIDES/COASTAL FLOODING...
Gusty west-northwester winds will continue behind a cold front
today which allows tidal anomalies to fall. No tidal flooding is
expected the next few days.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...Small Craft Advisory until 6 PM EDT Wednesday for MDZ008.
VA...Freeze Watch from late Wednesday night through Thursday
     morning for VAZ025>027-029.
     Wind Advisory until 8 AM EDT Wednesday for VAZ503.
WV...Wind Advisory until 8 AM EDT Wednesday for WVZ501-505.
MARINE...Small Craft Advisory until 6 PM EDT Wednesday for ANZ530>543.

&&

$$

SYNOPSIS...BRO
NEAR TERM...BRO/CPB
SHORT TERM...BRO
LONG TERM...CJL
AVIATION...BRO/CJL/CPB
MARINE...BRO/CJL/CPB
TIDES/COASTAL FLOODING...LWX