Arlington, Virginia 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

650
FXUS61 KLWX 230210
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
1010 PM EDT Sun Mar 22 2026

.WHAT HAS CHANGED...
Extended the Severe Thunderstorm Watch for western MD and
Mineral County WV due to storms moving in from OH producing
severe hail. After midnight, diminishing instability should
result in a lower severe potential.

&&

.KEY MESSAGES...
-1) A cold front could bring severe thunderstorms this
 evening/tonight.

-2) Turning cooler for Monday and Tuesday, with gusty winds on
 Monday.

-3) After a brief warm-up, a cold front will bring a chance of
 rain Thursday night into Friday and cooler temperatures for
 next weekend.

&&

.DISCUSSION...
KEY MESSAGE 1...A cold front could bring severe thunderstorms
this evening/tonight.

At this point, the chance of new storms developing ahead of the
front looks to be very low through mid evening given continued
capping in place. Thunderstorms that formed along the front
over PA initially have weakened, with a few gusty showers headed
for western MD. Additional storms over northern PA will likely
drift southeastward and perhaps clip northeast Maryland later
this evening. As low-levels stabilize with loss of daytime
heating, the trend should be for these storms to gradually
weaken as they move into our forecast area. As storms do move in
after dark, they could still potentially produce severe hail,
even if they`re elevated, along with gusty winds if they have a
well developed cold pool. Given strong lift along the front,
steep lapse rates aloft just above a stable near-surface layer,
and moderate shear, any storm that does manage to pop up
overnight could contain some hail or even gusty winds.

We`ll need to keep a close eye on trends given the strong
dynamics at play aloft. Otherwise, a wave of showers along the
cold front will be accompanied by a wind shift to the north and
winds gusting 20 to 30 mph overnight into early Monday morning.


KEY MESSAGE 2...Turning cooler for Monday and Tuesday, with
gusty winds on Monday.

A strong cold front will pass through the area tonight, ushering
much cooler air into the region for Monday and Tuesday. Any
lingering showers behind the front should come to an end shortly
after daybreak, with skies clearing out by afternoon. While it
will be much cooler than today, temperatures will still be a
couple degrees above normal, with highs in the 50s and lower 60s
for most (40s mountains). Northwesterly winds will gust to
around 30 mph for much of the day, making it feel a bit cooler.

Continued dry conditions are expected tomorrow night, with winds
gradually decreasing, and temperatures dropping back into the
20s and lower 30s. High pressure builds overhead on Tuesday,
leading to light winds, mostly sunny skies, and below normal
temperatures. Highs on Tuesday are forecast to be in the upper
40s and lower 50s for most.

KEY MESSAGE 3: After a brief warm-up, a cold front will bring a
chance of rain Thursday night into Friday and cooler
temperatures for next weekend.

At the moment, it appears unlikely a frontal zone between low
pressure centers in the Canadian Maritimes and Great Lakes will be
able to surge southward Wednesday night into Thursday. Thus, there
should be continued warm advection and above normal temperatures.
While a few showers can`t be ruled out during this period with the
isentropic ascent and potential subtle shortwaves, most places will
likely remain dry through Thursday.

The second low will race toward the Canadian Maritimes by Friday
morning, sending a cold front surging southward. With the front
becoming somewhat parallel to the westerly upper flow, there is some
uncertainty with how quickly the front moves south, as well as how
much moisture survives crossing the mountains. Thunderstorms may
develop across the Ohio Valley Thursday as well, but instability
will be lower east of the Appalachians as any of that activity
potentially reaches the area Thursday night. Rain chances will peak
Thursday night into Friday, with the frontal zone likely south of
the area by Saturday morning. Temperatures will likely start a
downward trend Friday, but will be dependent on the front`s
progress. Believe the frontal moisture should depart before it
becomes cold enough to snow, except perhaps in the Alleghenies.

High pressure of Canadian origin will build into the Ohio Valley
Saturday and overhead Saturday night. Below normal temperatures will
result, with most areas dropping below freezing Saturday night.
Temperatures will begin to moderate Sunday with continued dry
weather.

&&

.AVIATION /03Z MONDAY THROUGH FRIDAY/...
A cold front will drop southward into the area tonight,
leading to an abrupt wind shift to out of the north. Some
showers appear likely behind the front during the second half of
the night, but at the moment, the threat for thunderstorms looks
to be very low, with MRB standing the greatest chance. Low
ceilings also appear likely for a few hours late tonight behind
the front. Conditions will improve back to VFR by mid-late
morning tomorrow as wind pick up out of the northwest. Gusts to
around 25-30 knots will be possible through the afternoon
tomorrow.

VFR conditions persist Monday night through Tuesday, with winds
gradually decreasing Monday night, and then eventually becoming
very light to calm on Tuesday as high pressure builds overhead.

VFR conditions are likely Wednesday and Wednesday night as high
pressure departs. Southerly winds may gust to around 20 kt on
Thursday as a low pressure system passes well to the north. A cold
front may bring sub-VFR ceilings and rain chances Thursday night
into Friday. Northwesterly winds may turn gusty behind the front on
Friday.

&&

.MARINE...
A strong cold front will move over the waters tonight, causing
winds to shift to out of the north. SCA gusts are expected later
tonight through the day tomorrow and into tomorrow night.
Lighter winds are expected on Tuesday as high pressure builds
overhead.

Southwest winds may begin to increase Wednesday and Wednesday night
high pressure departs. However, advisory level winds may hold off
until Thursday as a low pressure system passes well north of the
area. The associated cold front will cross the area Friday, with
advisories potentially needed in the northwest flow in its wake.

&&

.FIRE WEATHER...
Winds will increase out of the northwest behind a cold front
tomorrow. Gusts to around 30 mph appear likely through much of
the day tomorrow, as relative humidity values drop into the 30s,
and potentially even upper 20s in spots. Temperatures tomorrow
are forecast to be considerably cooler, with highs in the 50s
and lower 60s for most (40s mountains). Another Special Weather
Statement for elevated fire weather danger may need to be
considered for portions of the forecast area tomorrow, with
central Virginia likely experiencing the worst fire weather
conditions.

&&

.CLIMATE...
Record daily high temperatures are possible on Sunday (March 22).
Below is a list of records for the date.

Site       Record/Year Set
DCA        90/1907
BWI        86/1907
IAD        83/1968
DMH        79/1955
NAK        82/1948
HGR        88/1907
MRB        84/1966
CHO        92/1907

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory from 2 AM Monday to 6 AM EDT Tuesday for
     ANZ530>543.

&&

$$

DISCUSSION...ADS/DHOF/KJP
AVIATION...ADS/DHOF/KJP
MARINE...ADS/DHOF/KJP