Frederick, Maryland 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

438
FXUS61 KLWX 200135 AAA
AFDLWX

Area Forecast Discussion...UPDATED
National Weather Service Baltimore MD/Washington DC
935 PM EDT Thu Jun 19 2025

.SYNOPSIS...
Drier and less humid Friday into Saturday as high pressure
builds into the region. A prolonged period of excessive heat is
expected Sunday into the middle part of next week.

&&

.NEAR TERM /THROUGH FRIDAY/...

Cdfnt has moved southeast of Cumberland and is seen on radar as
a broken line of light showers. Isolated to scattered light
showers will remain possible over the next couple of hours.
Otherwise, clearing skies and less humid conditions are expected
overnight. Winds will shift to NW behind the cold front.

&&

.SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY NIGHT/...
The humidity finally lowers along with a brief reprieve in the
excessive heat as we round out the workweek. Strong upper-level
ridging and surface high pressure will build over the eastern
CONUS through the start of the weekend. The surface high and
upper-level ridge will continue to strengthen each day bringing
warming temperatures and eventually more humidity. For Friday,
expect highs back in the mid 80s with dewpoints in the 50s and
low 60s. Overnight lows Friday night will fall into the upper
50s and low 60s west of the Blue Ridge with mid to upper 60s in
the metro areas. A spotty shower or t-storm cannot be ruled out
in northwest flow late Friday afternoon and evening as a weak
piece of trailing shortwave energy slides north and east of the
area. Highest confidence for this to occur would be along the
PA/MD line and west of the Catoctins. For now, hedged PoPs
to less than 15 percent given ample dry air advection settling
in with building surface high.

Low humidity continues Saturday although temperatures push back into
the upper 80s and low 90s under light southerly flow. Lows Saturday
night will drop back into the mid to upper 60s and low 70s. Humidity
will gradually increase during this time as broad 1024-1028 mb high
pressure strengthen off the Carolina coast.

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...
A strong ridge of high pressure will stay in place Sunday
through Wednesday. Heat and high humidity will be the main story
through these four days. High temperatures will reach the
middle to upper 90s with one or two days reaching the lower 100s
in some places, especially near the metros and eastern zones.
Heat indices will reach the 100 to 105 degree range in many
places with a few places reaching near or at 110 degrees.

&&

.AVIATION /02Z FRIDAY THROUGH TUESDAY/...

Winds will shift late this evening behind a cold front.

VFR conditions are expected Friday as high pressure builds back into
the region. Winds will remain out of the west and northwest at 5-10
kts. Winds switch to the south Saturday as high pressure sinks south
and east of the area.

VFR conditions at all terminals Sunday through Monday night. Winds
southwest to northwest light and variable with building high
pressure.

&&

.MARINE...

Southwest winds will switch to the northwest this evening with
gusts up to 25 kts.

Sub-SCA level winds return Friday afternoon with west to northwest
winds are expected. Winds will become southerly Saturday afternoon
at generally 10 knots or less.

No marine hazards Sunday through Monday night. Winds becoming light
and variable through the period.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...Small Craft Advisory until 6 AM EDT Friday for MDZ008.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 6 AM EDT Friday for ANZ530>534-
     537>541-543.

&&

$$

SYNOPSIS...LFR
NEAR TERM...LFR
SHORT TERM...DHOF/EST
LONG TERM...KLW/KJP
AVIATION...LFR
MARINE...LFR