Glen Burnie, Maryland 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

143
FXUS61 KLWX 210755
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
355 AM EDT Sat Jun 21 2025

.SYNOPSIS...
Less humid conditions are expected today as high pressure
remains around the region. A prolonged period of very hot
weather is expected Sunday into the middle part of next week as
a large ridge of high pressure builds over the eastern United
States. A risk of showers and thunderstorms returns during the
middle to latter portions of next week as a frontal system
approaches from the north.

&&

.NEAR TERM /THROUGH TONIGHT/...
The frontal zone which tracked through 24 hours ago has settled
down into the southeastern U.S. In the wake, a broad area of
high pressure extends across the Mid-Atlantic region. While
moisture levels have dropped off in the post-frontal regime,
precipitable water values remain elevated (1.20 to 1.30
inches). This is somewhat reflected by the uptick in dew points
this morning which average in the low/mid 60s. Current
conditions are dry with scattered mid/high clouds tracking
overhead. A broader shield of mid-level clouds will cross the
Mason-Dixon Line before moving into northern Maryland in the
next couple hours. Amidst relatively light winds, temperatures
should hold steady in the 60s, locally in the low/mid 70s in the
usual milder spots in the urban corridors and along the
Chesapeake Bay/Potomac.

The mentioned surface ridge stays in control today which will
maintain tranquil weather. As mid/upper heights rise by around
4-6 dm, this translates to an increase in temperatures today.
Expect highs to be around 3 to 6 degrees warmer which would
support widespread upper 80s to low 90s over the region. As
diurnal heating picks up, expect some fair weather cumulus to
percolate through the afternoon before washing out after
sundown.

High pressure moves offshore later today yielding a return to
southerly winds on the western periphery of this ridge. This
helps increase temperatures and dew points heading into the
tonight. Forecast lows should mainly range from the mid 60s to
low 70s, while being closer to 75 degrees in D.C. and Baltimore.

&&

.SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...
The anomalous ridge initially centered over the Missouri to
Tennessee valleys will advance eastward in time. Global guidance
agree on an intensification of this region given the expansive
nature of the 594-dm contour. Being on the order of 2 standard
deviations above climatology coupled with the stagnant nature of
this ridge, this should set the stages for a multi-day heat
wave. The latest forecast package calls for widespread mid 90s
with a few pockets of upper 90s possible. It appears 850-mb
temperatures will range from 22 to 24C which would support near
100 degree readings given a fully dry adiabatic layer to the
surface. With dew points in the upper 60s to low 70s, afternoon
heat indices will begin to push into the 100 to 105 degree
range. Heat Advisories may be needed across portions of the area
on Sunday. Little to no relief is expected into the night as
lows stay in the low/mid 70s (upper 70s in the urban hubs). As
usual, mountain locations will be cooler while running in the
mid/upper 60s.

A slight increase in heights aloft may usher temperatures to the
century mark on Monday. Upper 90s become more widespread with a
slew of 100 degree forecasts spread across vast portions of the
area. Although winds shift to light northwesterlies, humidity
levels still remain elevated. Opted to go slightly below the
guidance which keeps such dew points in the low 70s. Heat
indices up to 105 to 110 degrees are possible on Monday which
starts pushing areas closer to Excessive Heat Warning criteria.
Will continue to monitor the forecast ahead with heat products
likely to follow in the next day or two.

Nighttime temperatures further warm with mid/upper 70s covering
larger portions of the map. For those vulnerable to the heat,
please ensure to find ways to stay cool and hydrated,
particularly at night. The following website provides more about
heat safety: weather.gov/safety/heat.

&&

.LONG TERM /TUESDAY THROUGH FRIDAY/...
A ridge of high pressure will remain in place into Tuesday,
possibly even early Wednesday. Hot and increasingly humid
conditions expected each day Tuesday through Friday. High
temperatures in the middle to upper 90s each day, possibly
reaching the lower 100s in the metros on one or two of those
days. Heat indice values will climb higher each afternoon than
the previous day. Heat indices could reach the 100 to 107 range
in many places. Low temperatures at night will be persistently
in the middle 70s each night. The next chance for showers or
thunderstorms is Tuesday afternoon or evening, but an even
higher chance of showers and thunderstorms possible on Wednesday
when the ridge of high pressure flattens or weakens. Additional
thunderstorm chances remain through the end of the work week as
a frontal zone slowly approaches from the north.

&&

.AVIATION /07Z SATURDAY THROUGH WEDNESDAY/...
Given no precipitation in sight, VFR conditions are expected
through the weekend and into early next week. High pressure
around the area should keep winds around 10 knots or less. By
Sunday, this ridge exits which yields a return to southerly
winds. With an upper ridge setting up overhead, gradients weaken
further into Monday.

VFR conditions at all terminals Tuesday through Tuesday night. A
few restrictions cannot be ruled out on Wednesday given a slight
chance for afternoon/evening thunderstorms. Winds northwest 5
to 10 knots through the period.

&&

.MARINE...
High pressure across the area has kept marine wind gusts
mainly at 10 knots or less. Eventually this ridge moves offshore
with southerly channeling picking up later this evening into the
overnight hours. Consequently, gusts up to 20 knots are possible
over the Chesapeake Bay which will require Small Craft
Advisories. Beyond Sunday morning, winds become lighter which
will keep the area waters free of hazards.

Sub-SCA winds for Tuesday through Wednesday night. Winds
northwest 5 to 10 knots through the period. A slight chance of
thunderstorms on Wednesday afternoon/evening could bring brief
hazardous conditions to the waters.

&&

.TIDES/COASTAL FLOODING...
A return to southerly flow will nudge tidal anomalies higher
today. Although flooding is not forecast at this time, some
guidance has Annapolis in particular very close to minor flood
stage during the evenings this weekend.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...None.

&&

$$

SYNOPSIS...BRO
NEAR TERM...BRO
SHORT TERM...BRO
LONG TERM...BRO/KLW
AVIATION...BRO/KLW
MARINE...BRO/KLW
TIDES/COASTAL FLOODING...BRO/ADS