286
FXUS61 KAKQ 290644
AFDAKQ

AREA FORECAST DISCUSSION
National Weather Service Wakefield VA
244 AM EDT Sat Jun 29 2024

.SYNOPSIS...
Heat and humidity return for today and Sunday. A cold front
drops across the area late Sunday night through Monday morning.
Ahead of it, strong to severe storms with heavy rainfall are
expected. Dry weather is then expected through the middle of
next week with additional heat concerns possible for Independence
Day.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
As of 850 PM EDT Friday...

High pressure is centered just off the New England coast this
evening. Relatively comfortable outside at this hour with temps
in the mid/upper 70s under moderate humidity levels (dew points
in the 60s). A quiet evening/night is expected with mainly
clear skies, at least initially. Cloud cover will build back in
after midnight through sunrise as the low-level flow shifts to
the SE and dew points creep up. An isolated shower or two is
also possible in NE NC and SE VA after 06z/2 AM Saturday. Lows
tonight will be in the upper 60s for much of the area with lower
70s in the SE and immediately along the bay.

&&

.SHORT TERM /6 AM THIS MORNING THROUGH SUNDAY NIGHT/...
As of 355 PM EDT Friday...

Key messages:

- Hot and humid conditions return for the weekend, peaking on
Sunday with dangerous heat indices around 105F.

- A cold front brings potential for strong to severe storms and
heavy rain on Sunday.

Sfc high pressure to the NE slides farther offshore Saturday as low
pressure moves into Eastern Canada with its trailing cold front
gradually approaching Appalachia. A weak warm front will push north
of the area, bringing southerly flow and hot temps. Should be mainly
dry Sat, but may see isolated showers and thunderstorms across the
area as weak shortwave energy passes through the area. CAMs do show
some morning convection along the coast, so have introduced Schc
PoPs in the SE. Highs will be in the low 90s. With dewpoints up into
the low 70s, heat indices will be in the upper 90s to around 100.
Sat night will not offer much relief from the heat with lows in the
upper 70s.

An upper trough and a strong cold front (for this time of year, at
least) will approach the area Sunday, crossing the region Sun night
into Monday. Ahead of the front, S/SW flow will allow hot and humid
conditions to continue. Cloud cover and potential morning precip
could hinder temperatures, but still expecting highs in the low-mid
90s. With dew pts in the mid 70s in most areas during peak heating,
dangerous heat indices around 105F are in the forecast. Note that
the dew point forecast continues to be a couple degrees lower than
NBM and is more in line with MOS values. While the potential for
morning convection exists, the main threat for scattered to numerous
storms will be in the afternoon and into the overnight hours.
Moderate to heavy rainfall is expected, especially for the SE half
of the FA where PWs will approach 2.5". As such, WPC has placed this
portion of the area in a Marginal ERO. Instability provided by the
heat/humidity along with moderate shear will allow for some storms
to be strong to severe, despite the stronger winds aloft being to
the N. Thus, there is a slight risk for severe storms for much of
the FA (~N of US460) and a Marginal elsewhere. Precip will clear out
from NW to SE late Sunday night. Lows will be mid to upper 60s NW
for most and the low 70s to the far SE.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
As of 355 PM EDT Friday...

Key Message:

- A brief break in the heat is likely early next week before
  very hot weather potentially returns by Independence Day.

High pressure fills in behind the front, bringing dry weather
through mid week. Relatively cooler temps and much lower dewpoints
will bring brief relief from the heat and humidity. Highs will be in
the low to mid 80s. Warming some on Tuesday with highs in the mid
80s, but onshore flow keeps temps a few degrees cooler at the coast.
Hot weather returns mid week with highs in the low 90s Wed and mid-
upper 90s on the Fourth of July. With dewpoints creeping back toward
70 on Thursday, there is the potential for heat indices over 100.
Remaining dry through at least Wed with a chc for afternoon
thunderstorms on Thursday. .

&&

.AVIATION /07Z SATURDAY THROUGH WEDNESDAY/...
As of 235 AM EDT Saturday...

High pressure centered off the New England was leading to light
E/ESE flow at area terminals early this morning. As a result,
stratus and lower SC were developing over portions of the
region. Guidance continues to favor low-end MVFR, but cannot
rule out patchy pockets of IFR stratus, esply in/near central
VA (including RIC) until around 12Z this morning. Not expecting
much in the way of VSBY restrictions. A few showers are also
possible at ECG through this morning. For this aftn, mainly dry
conditions expected though a very brief shower or storm is
possible at any terminal. SCT CU again redevelops with a 7-12
kt S or SE wind.

Mainly dry conditions continue into tonight, with just an isolated
threat of a shower or storm. Sctd to numerous showers/tstms are
likely Sun aftn through Sun night, some of which could be strong
to severe. High pressure and drier conditions return for later
Mon morning through Tue.

&&

.MARINE...
As of 300 PM EDT Friday...

Key messages:

- Generally sub-SCA conditions with periods of breezy
onshore/southerly winds this evening through the weekend.

- A period of SCA conditions is very likely on Monday with northerly
winds behind a cold front.

- Moderate risk of rip currents through Saturday.

The secondary cold front is south of the waters this afternoon with
high pressure centered south of Long Island. There is still a decent
pressure gradient in place, which is resulting in E-NE winds around
15 kt with gusts to 20 kt over the marine area. Winds become SE and
remain near 15 kt this evening-tonight as the high pushes offshore
before becoming SSE on Saturday. Could see a period of low-end SCA
conditions on the bay late Sat evening-Sat night as the winds become
more southerly and increase to 15-20 kt. Local wind probs show a 40-
70% chc of sustained 18 kt winds between 8 PM Sat-4AM Sun (highest
on the mid/upper bay). Winds diminish to 10-15 kt and become SSW by
mid to late Sun AM.

A decently strong summer cold front looks to approach the area
Sunday before crossing the waters from N-S between 4-10 AM Monday
morning. Scattered to numerous tstms are expected Sun aftn through
the first part of Sun night, which will likely necessitate SMWs (a
few of the storms could even produce 50 kt wind gusts). Sub-SCA
outside of any storms from Sun-late Sun evening. However, there will
be decent cool/dry advection following the cold FROPA Monday
morning, which will allow N winds to increase to ~20 kt (with
frequent gusts around or just above 25 kt). SCAs will likely be
needed for all of the Ches Bay, Lower James, and maybe even the
upper rivers/coastal waters. Local wind probs show nearly a 100% chc
of sustained 18 kt winds Mon AM, with low (~20%) probs of sustained
25 kt winds.

Waves/seas 1-3 ft/2-4 ft this afternoon. Seas generally 3-4 ft this
weekend with 1-3 ft waves. Seas could build to 5 ft S of Cape
Charles on Monday following the cold FROPA (with 3-4 ft waves). Sub-
SCA waves and seas are expected from Mon night through the middle of
next week.

There is a moderate risk of rip currents across all Atlantic- coast
beaches in the FA through Saturday.

&&

.AKQ WATCHES/WARNINGS/ADVISORIES...
MD...None.
NC...None.
VA...None.
MARINE...None.

&&

$$

SYNOPSIS...TMG
NEAR TERM...AM/SW
SHORT TERM...AM
LONG TERM...AM
AVIATION...TMG
MARINE...ERI/MAM