225
FXUS61 KLWX 110106
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
906 PM EDT Mon Jun 10 2024

.SYNOPSIS...
A supporting mid-level trough of low pressure will push across
the region today. High pressure will build over the area tonight
through midweek, leading to mostly dry conditions.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
Showers and an isolated thunderstorm will continue to be
possible through around midnight across areas mainly along and
east of the Blue Ridge. Showers west of I-95 may become heavier
as they reach the corridor over the next few hours with slightly
more favorable CAPE and moisture availability. Winds may be
elevated with any of these showers and storms to around 20 to 25
knots but diminish back behind them.

Previous Discussion Follows:
Dry conditions return late tonight for those west of I-95 with
patchy fog west of the Blue Ridge. Overnight temperatures dip
into the 50s for most with higher elevations dipping into the
upper 40s. Metro areas will stay in the low 60s.

&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/...
A weak area of low pressure and surface trough located just off
the east coast will lead to a slight chance of rain showers and
a possible rumble of thunder Tuesday in the easternmost portions
of the forecast area. Those west of I-95 are expected to remain
dry with sunny to mostly sunny skies.

Dry conditions are expected areawide beginning Tuesday night as
high pressure builds over the region. Dry conditions continue
through Wednesday with mostly sunny skies.

High temperatures on Tuesday will be in the 70s for most with
those at higher elevations staying in the 60s. Overnight lows
on Tuesday will dip into the 50s for most with those near the
metro areas staying in the low 60s. On Wednesday, temperatures
will be a few degrees warmer with highs in the low 80s for most.
Overnight low temperatures will be in the upper 50s to low 60s.

&&

.LONG TERM /THURSDAY THROUGH MONDAY/...
The warmest air mass of the year is set to build in the region
towards the end of the week ahead of an approaching cold front that
sweeps through on Friday. High pressure will then build across the
region for the weekend, with dry and seasonably warm conditions
expected.

For Thursday, dry conditions are expected to continue as high
pressure gradually moves offshore. Moisture return isn`t expected to
be enough to bring thunderstorms into the forecast just yet. High
temperatures will be very warm, reaching the low 90s for most.

By Friday, the aforementioned cold front will approach and cross the
region throughout the day. Ahead of that, southerly flow will funnel
in warmer and somewhat more moist air into the region. Westerly flow
aloft could help keep dew points on the lower end with mixing during
the afternoon, so keeping dew points roughly around the low to mid
60s for now. What this will do though is lead to well above average
temperatures. High temperatures Friday are likely in the mid to
upper 90s for most. Heat Advisories may be needed, but could be
difficult to high criteria if dew points struggle to rise higher
than the low 60s as previously mentioned.

Now, some guidance does bring dew points more into the mid-upper
60s, which could change the game a bit. Should we get into the 90s
with dew points into the mid-upper 60s, the cold front may even
spark a few thunderstorms during the afternoon. Should this occur,
some storms could very well be severe. Thinking is that the best
chance for this would be along a westward propagating Bay Breeze.
Dew points are likely to be enhanced right along the Chesapeake Bay,
so could see a localized favorable environment for thunderstorms to
develop. Further west, finding it hard to see convection firing
along the cold front itself, as dew points just seem like they are
going to be too low, thus CAPE would be nearly non-existent.
Carrying 20 POPs across most of the area, even west of I-95, as it
is a very low likelihood event, but certainly can`t rule it out at
this point. Have decided to up POPs around 30 percent right around
the Chesapeake Bay to account for the localized higher likelihood
mentioned previously along the Bay Breeze.

The weekend looks to be dry, as ridging aloft takes hold of the
region in the wake of the aforementioned cold front. Highs will
generally be slightly above average, reaching the upper 80s.
Humidity levels should be tolerable with dew points in the 50s.

&&

.AVIATION /01Z TUESDAY THROUGH SATURDAY/...
VFR conditions are expected at all terminals through Wednesday
with winds remaining light out of the northwest. Winds go light
and variable tonight and are expected to remain light, out of
the north/northwest through Wednesday.

As the pressure trough pivots overhead, isolated showers and a
possible rumble of thunder are possible. Greatest chances are
for KIAD and KDCA so included VCSH/SHRA for the remainder of the
evening. Dry conditions return Tuesday evening and persist
through Wednesday.

VFR conditions are expected on Thursday and likely even into Friday.
However, an isolated thunderstorm cannot be ruled out at any of the
terminals Friday afternoon. Better chances could occur at DCA, BWI,
and MTN where thunderstorm chances are a bit higher. If storms move
over a particular terminal, brief VSBY reductions would occur.

&&

.MARINE...
Small Craft Advisories are in effect until 10 PM this evening
with gusts up to 25 knots expected until the pressure trough
moves further east.

An extended period of south-southwesterly winds is likely for
Thursday through much of Friday. Some southerly channeling effects
are evident in the model output which could support some advisory-
caliber winds Thursday and Friday afternoon/evening. A chance for
showers and thunderstorms returns to the waters late Friday with a
cold front, which could necessitate some SMWs should storms develop.

&&

.TIDES/COASTAL FLOODING...
Some of the more sensitive tidal sites start to near (or reach)
Action during the higher of the high tide cycles by Tuesday
morning with snapback occurring. However, no coastal flooding
is anticipated through Thursday.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 10 PM EDT this evening for
     ANZ530>543.

&&

$$

SYNOPSIS...AVS
NEAR TERM...AVS/ADM
SHORT TERM...AVS
LONG TERM...CJL
AVIATION...AVS/CJL/ADM
MARINE...AVS/CJL/ADM
TIDES/COASTAL FLOODING...LWX