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Ark, Virginia Weather Forecast Discussion

631
FXUS61 KAKQ 241740
AFDAKQ

AREA FORECAST DISCUSSION National Weather Service Wakefield VA 140 PM EDT Wed Sep 24 2025

.SYNOPSIS... High pressure slides farther offshore today through Thursday bringing very warm temperatures and more humid conditions. A slow moving cold front moves into the area Thursday night and Friday, with an upper trough settling over the Southeast by the weekend. This will bring more unsettled conditions late this week into the weekend.

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.NEAR TERM /THROUGH TONIGHT/... As of 1009 AM EDT Wednesday...

Key Messages:

- Mainly dry and rather warm today with some late day and early evening showers and thunderstorms possible north and northwest of the Richmond metro.

An expansive surface high is centered in the western North Atlantic, which has resulted in southerly flow across the area. Temperatures and atmospheric moisture have responded by increasing to above normal for this time of year. Regional 12z soundings measured PW values between 1.4-1.7", and dew points are the upper 60s to lower 70s. Fog and low stratus that developed within this very moist environment this morning has lifted across the region, which has allowed temperatures to already reach the lower to mid 70s. A humid late September morning has stemmed from the minimal dew points depression being observed this morning. Aloft, an upper ridge is set up across the subtropical western Atlantic. To our west, a longwave trough extends from the Central Plains through eastern Canada with a closed low centered over the Great Lakes region. There is WSW flow aloft ahead of the upper trough from the Mid-South through the Ohio Valley, with several shortwave features noted within the broader flow.

WSW flow aloft will prevail today into tonight with much of the local area under the influence of an upper ridge across the subtropical western Atlantic. Weak shortwave energy sliding north of the region could trigger a few afternoon/early evening showers/tstms across the northern tier of the area, with PoPs mainly 20-40% for these locations, and locally 30-50% for the NW Piedmont. Otherwise, partly to mostly sunny today and rather warm for late September with highs in the mid 80s to near 90F are forecast. Partly cloudy and mainly dry conditions are expected tonight aside from some lingering showers across the north. Warm and humid with lows in the upper 60s to around 70F.

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.SHORT TERM /THURSDAY THROUGH FRIDAY/... As of 355 AM EDT Wednesday...

Key Messages:

- The upper height pattern amplifies for the second half of the week with a deep trough taking shape over the Mississippi River Valley, translating E and NE Thursday into Friday.

The upper low over the Great Lakes becomes an open wave and shifts to New England Thursday into Friday. Meanwhile, another upper low develops on the tail end of the broader upper trough and settles over the Mid-South by Friday. During this time, the upper ridge remains offshore over the western Atlantic. The cold front associated with the upper trough slows down as it approaches the local area later Thursday into Thursday night, before finally dropping into the area Friday. Given the split in the upper pattern, the best forcing with the northern wave remains N of the local area, while better ascent with the developing upper low initially remains to the SW. Therefore, despite PW values 150-180% of normal (1.8 to nearly 2.0"), less coverage of heavy rain is expected Thursday and Friday as any convection should be less organized with lesser broad scale lift locally. Thursday morning to early afternoon should be mainly dry, with some showers/tstms across the N later in the afternoon and evening. Lesser coverage is expected with the diurnal cycle later Thursday night into early Friday, with redevelopment expected over SE VA/NE NC Friday. The severe risk is low Thursday (marginal, level 1 of 5) with the main threat being damaging wind gusts. Highs Thursday will again be in the mid 80s to near 90F, then not quite as warm Friday with highs in the lower 80s, after morning lows in the mid 60s to around 70F.

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.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... As of 355 AM EDT Wednesday...

Key Messages:

- Unsettled pattern continues this weekend into early next week with near seasonal temperatures.

The upper trough lingers over the Mid-South Saturday and slowly lifts to the NE Sunday. The weekend is trending more unsettled with the 00z/24 EPS showing more QPF than the 00z/24 GEFS. The EPS returns PW values to 150-180% of normal while generally 130- 150% of normal in the GEFS. Highs Saturday and Sunday are mainly in the mid/upper 70s, with lows in the 60s. The upper trough remains over the Mid-Atalntic and Southeast early next week as strong high pressure builds SE across Ontario and Quebec. Meanwhile, the ECWMF/GFS/CMC and the EPS/GEFS ensembles are showing increasing confidence of tropical development in vicinity of the Gulf Stream (AL94 with AL93 farther offshore). How much if any impact this has locally remains a low confidence forecast, but it is worth monitoring. Regardless, rain chances linger into early next week. High temperatures will mainly be in the 70s early next week with lows in the upper 50s to mid 60s.

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.AVIATION /18Z WEDNESDAY THROUGH MONDAY/... As of 140 PM EDT Wednesday...

VFR conditions are expected prevail through much of tonight. SCT cumulus/BKN high clouds are expected this aftn/early evening. There is a minimal (20-30%) chc of showers and possibly a tstm at RIC/SBY between 20-02z...but not confident enough to mention precipitation in the TAFs. Have moderate confidence that MVFR to IFR stratus impacts the terminals late tonight-Thu AM away from the immediate coast (with patchy fog also possible at ECG). CIGs gradually lift and become VFR by midday Thu. There is a better chc of showers/tstms across the terminals Thu aftn/evening (highest PoPs are at RIC/SBY). There is an outside chance of a strong storm or two as well.

A cold front slowly crosses the region Thursday night and Friday. Showers are likely with a few tstms possible during the first part of Thu night, and again across SE VA/NE NC Fri aftn/evening. Occasional sub-VFR conditions are expected. A chc of showers lingers into Saturday and potentially Sunday as well.

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.MARINE... As of 403 AM EDT Wednesday...

Key Messages:

- Winds increase later today between 10 to 15 kt out of the SSE potentially leading to a brief SCA conditions across bay.

- Moderate rip risk for all beaches today.

- Another chance of SCA wind conditions return Thursday into Friday night primarily for the Ocean Zones.

Morning analysis shows a 1018mb high pressure just off the east coast. This high is allowing winds to generally be out of the SSE around 10 kt. Seas this morning have subsided from yesterday and are between 3 to 4 ft across the ocean and 1 to 2 ft across the bay. Through the day winds will begin to increase as the pressure gradient from the the high pressure to the east and low pressure developing to the west tightens. Winds will continue to remain out of the SSE between 10 to 15 kt. There is the potential late this afternoon and into this evening that there could be some brief 20kt gusts across the bay. However, local wind probs remain between 30 to 40% of frequent gusts at or above 18 kt, the pressure gradient does not look to be as tight, and typically SSE winds tend to under perform over the waters. Therefore, no SCA have been issued for the bay at this time. Seas through the day will generally remain benign with waves between 3 to 4 ft across the ocean and 1 to 2 ft across the bay. Through tonight and into Thursday morning winds will remain around 10 kt before increasing to 10 to 15 kt across the bay and 15 to 20 kt with possible gusts nearing 25 kt across the ocean as the pressure gradient tightens ahead of an approaching front. This could lead to a brief period of SCA for the ocean waters. In addition, local wind probs increase across the ocean to 40 to 50% of wind gusts at or above 25kt. Seas on Thursday will continue to be around 1 to 2 ft across the bay and 3 to 4 ft across the ocean. However, will note, depending on the exact direction of the wind thursday, it could potentially build seas to 5 ft across the northern ocean zones and SCA maybe issued. However, confidence is low at this time and trends will be monitored. By Friday the front will stall leading to weaker winds and leading to low confidence in the wind direction. By the weekend, high pressure will build in bringing benign marine conditions across the local waters.

Moderate rip risk is in the forecast for today. Although the swell will gradually subside today , it will still be at 3 to 4 feet which combined with the long period of 10 to 11 sec.

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

&&

$$

SYNOPSIS...AJZ/RHR NEAR TERM...AJZ/NB SHORT TERM...AJZ LONG TERM...AJZ AVIATION...AJZ/ERI MARINE...HET

NWS AKQ Office Area Forecast Discussion

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