Area Forecast Discussion
Issued by NWS Wakefield, VA

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000 FXUS61 KAKQ 211448 AFDAKQ Area Forecast Discussion National Weather Service Wakefield VA 948 AM EST Sat Jan 21 2017 .SYNOPSIS... High pressure over the area this morning will weaken and slide offshore later today as a frontal boundary stays just off to the south. Low pressure over the nations mid section will intensify as it slowly tracks east across the Mid Atlantic region Sunday and Monday. The intense low will move off the New England coast Tuesday. && .NEAR TERM /THROUGH TONIGHT/...
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Fog continues to be widespread across the fa this morning with vsbys avgg 1/2 to 2SM and only sct areas of less than 1/2SM. SPS extended thru 16Z for this with slowly improving vsbys over the next few hrs. Left max temps alone for now but did adjust hrly grids to current readings. Thinking is that temps jump into the 50s once the fog burns off. Otw, remaining cldy. PVS DSCN: Latest sfc analysis shows 1014 mb hi pres directly over the Mid Atlc with a stationary front stretched across the Carolinas. With light winds and plentiful low-level moisture, low stratus is widespread across the region with areas of fog as well. This is expected to continue through mid to late morning without any mechanism to scour out the moisture. Dry wx this morning, with approaching WAA and shortwave energy aloft leading to showers psbl over SW areas late in the daytime period, with most other locations expected to stay dry. Hi temps in the mid- upr 50s. Best timing for the approaching slug of moisture and forcing will be this eveng across the area, and have increase PoPs to likely-categorical southern half of area, with chance PoPs remainder of area. With a break in the pcpn overnight and light winds, could see another round of patchy DZ/FG so added this to the forecast as well, through mid morning Sunday. Lows tonight range from the mid 40s NE to lwr 50s SW.
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&& .SHORT TERM /SUNDAY THROUGH MONDAY/... Tricky forecast continues for the short term period. Following any morning DZ/FG Sun, PoPs quickly ramp up through the day Sun as strong sfc low pressure and shortwave energy aloft approach from the west. Increasing PW`s will result in moderate to locally heavy rainfall. Likely-categorical PoPs. Warm frontal boundary progged to drift north to near the NC-VA border so will have chc thunder across southern half of fa during the afternoon with decent shear as well. High temps upr 50s north to mid 60s south, but temps could easily end up higher or lower. Models continue to have trouble with the stacked upr-level low progged to slowly cross the region late Sunday night and Monday. Categorical pops for shwrs Sunday night. Lows upr 40s/mid 50s. At some point in time, a triple point low is forecasted to cross Virginia. Current timing is Monday afternoon which will continue to produce widespread shwrs across the north with a dry slot potentially cutting off pcpn across parts of the area Monday afternoon. However, enough instability is noted to keep thunder mentioned across the SE in the warm sector. Highs mid 50s to lwr 60s. QPF through Monday should average one to two inches with locally higher amounts possible. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... Upper low pressure lifts northeastward away from the region Monday night and Tuesday, with precipitation chances winding down by Tuesday morning. High pressure is expected to return Tuesday night into Wednesday. A cold front associated with an upper low lifting over eastern Canada is progged to push across the region late Wednesday night and Thursday. Will hold onto slight chc to low chc pops (20-30%) during this time. High pressure returns again next Friday with temperatures falling back below normal for this first time in awhile. Highs Tuesday mostly in the 50s. Highs Wednesday from the mid 50s Eastern Shore to the low 60s inland. Thursday`s highs back in the 50s, then cooling into the 40s next Friday. && .AVIATION /15Z SATURDAY THROUGH WEDNESDAY/... Widespread sub-VFR conditions to start off the 12Z TAF period. With a weak warm front in the vicinity, light/calm winds, and abundant low-level moisture, low-stratus is prevalent with pockets of low vsbys as well. Expect mainly IFR/LIFR conditions through early/mid-morning, with slightly improving cigs not until late in the morng/aftn as winds become southerly and the next low pres systm approaches from the sw. Some areas, especially inland like KRIC, may remain IFR for the duration of the TAF period. There will be a good chance for showers tonight as aviation conditions again deteriorate due to low cigs and vsbys. OUTLOOK...Periods of rain, moderate to heavy at times, Sunday through Monday, will be accompanied by IFR conditions. As low pressure moves off to the northeast...dry weather and a clearing sky is indicated for Tuesday and Wednesday. && .MARINE... Weak high pressure right over the marine area early this morning, will slide out into the Atlc by early this evening. NNE winds around 5 kt or less, will become SE or S 5 to 10 kt this aftn. One weak area of low pressure will move acrs NC and SE VA later tngt thru Sun. This will turn winds to the E or SE acrs most of the waters, except SW or S ovr the NC waters during this time with speeds 5 to 15 kt. Waves 1 to 2 ft and seas 2 to 4 ft. Then Sun night into Tue morning, stronger low pressure will move fm ern TN/wrn NC and SC east-northeast acrs the CWA to just off the srn New England coast. This will result in stronger E, SE and S winds over the waters (10-20 kt with gusts to around 30 kt) Sun night thru most of Mon, with the strongest ESE winds affecting the two nrn coastal waters. SCA conditions will be likely there esply late Sun night thru Mon. SCA may be needed acrs the remainder of the coastal waters as seas could reach at least 5 ft out toward 20 NM. Seas may build to 6 to 9 ft ovr the two nrn coastal waters. Winds become NW all waters on Tue with SCA conditions probable, esply for the coastal waters. Seas 4-6 ft. && .AKQ WATCHES/WARNINGS/ADVISORIES...
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MD...None. NC...None. VA...None. MARINE...Dense Fog Advisory until noon EST today for ANZ630>638-650-652- 654-656-658.
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&& $$ SYNOPSIS...MAS NEAR TERM...MAS/MPR SHORT TERM...MAS/MPR LONG TERM...JDM AVIATION...MAS MARINE...TMG is the U.S. government's official web portal to all federal, state and local government web resources and services.