Area Forecast Discussion
Issued by NWS Wakefield, VA

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000 FXUS61 KAKQ 311846 AFDAKQ Area Forecast Discussion National Weather Service Wakefield VA 246 PM EDT WED AUG 31 2016 .SYNOPSIS... Tropical Depression Number 8 lingers offshore today and will push farther out to sea tonight into Thursday. A cold front will cross the Mid Atlantic states on Thursday. Another tropical system...Tropical depression 9...will lift northeast along the Southeast coast Friday and Saturday...before pushing farther offshore late in the upcoming holiday weekend. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Quick update to drop the fog and account for the one lone shwr moving east across Caroline cnty. Otw...lee trof to trigger some diurnal convection across the mts then drifts se across nern most cntys. Can not rule isltd convection along sea breeze bndrys as well. Highs upr 80s to lwr 90s. PVS DSCN: Latest surface analysis shows weak hi pressure over the Mid Atlantic with Tropical Depression #8 70 miles southeast of Cape Hatteras. This system is expected to become Tropical Storm Hermine as it slides NE today, staying offshore. With the local area remaining west of the storm track expect little to no impact other than a small chance of rain this aftn/tonight near the coast and moderate/high rip current risks (see tides/coastal flooding section below). As for temps, expect highs averaging in the upr 80s to lwr 90s. && .SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY/... The aforementioned tropical system will be farther offshore by tonight as a cold front will be approaching from the NW. That front is progged to push through the area Thu. Will have 40 to 50% POPS most areas by Thu aftn, lingering the POPS across the south into Thu night. Highs near 90 F S to mid 80s N. Drier and cooler Fri with highs in the lower 80s (some clouds/precip may linger across southern VA and ne NC as the front stalls so will maintain a 20-30% POP there). && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... While some significant differences remain, 00z/31 deterministic models beginning to converge with respect to their handling of TD9. This system is expected to slide NE along the departing cold front along the SE coast before pushing well offshore of the VA/NC coast by Sat night and Sunday. With the official NHC track now shifted slightly to the west, have nudged pops into chance range over SE coast. Latest track would favor keeping heaviest rainfall just to our southeast. However, there is increasing confidence that some tropical shras will push across our SE VA/NE NC zones Friday afternoon and night into Saturday midday. Also have potential for 30-40mph along immediate coastal zones on Saturday. Could also see some gusts inland with sharp pres gradient between the TD9 /potentially T.S. Hermine at that time/ and building surface ridge. && .AVIATION /19Z WEDNESDAY THROUGH MONDAY/... Sct to bkn cumulus was present over the TAF sites early Wednesday afternoon. VFR conditions and light onshore winds are forecast the rest of the afternoon. Moist conditions could lead to patchy fog once again Thursday morning over inland areas. Included 2 mile vsby at RIC from 09-13z as winds are expected to be near calm. A weak cold front moves into the area on Thursday. OUTLOOK...With the cold front present over the area...scattered thunderstorms are forecast Thursday afternoon and early evening. Friday through Saturday...There is a potential impact from tropical storm Hermine or its remnants. See updates from NHC. Sunday and Monday...At this time...it appears that mainly dry weather can be expected. && .MARINE... Latest obs reflect E-NE flow aob 10 kt across the waters this morning. Seas remain choppy...a combination of fresh swell from Gaston with some shorter period wind wave (6-9 seconds) over the southern zones. However, seas have subsided a bit...and therefore lowered SCA this morning, as seas have dropped below 5ft area wide this morning. Good agreement w/WaveWatch and NWPS that seas remain in the 3-4 ft range through the day, w/ waves generally 2-3 ft on the Bay and Sound. Winds remain east 10-15kt, strongest through early afternoon before diminishing late, w/winds veering around to the E-SE this evening. Winds become W-SW late tonight ahead of an approaching cold front, with that front to drop across the waters Thu morning through Thu night. Winds gradually veer around to the w-nw from north to south Thursday and Thursday night, eventually becoming NNE by early Friday morning. Majority of Hi-res models now support a brief window of SCA winds late Thu night into Friday morning (mainly southern bay and coastal zones). Seas progged to build up to 4-5ft south of the VA/NC border during this period by Wavewatch Thu night. Looking towards the weekend, models are beginning to converge a bit with respect to handling of TD 9. 00z/31 Models have come slightly west with the track of the system, generally sliding NE along the departing frontal boundary friday through Saturday night. The potential for a period of at least strong SCA winds is increasing, mainly for friday evening and early Saturday. Have nudged Seas and winds up a bit into strong SCA range, mainly for central and southern Coastal Waters. Mariners should continue to monitor the progress of the forecast in the coming days. It is possible that winds/seas may need to be adjusted a bit higher as forecast confidence (hopefully) gradually improves. && .TIDES/COASTAL FLOODING... Have maintained a high risk for rip currents over Virginia Beach and Northern OBX due to long period swell, 3-4 ft nearshore waves, and favorable swell direction. Moderate risk for rip currents continues for the northern beaches. Given the latest track on TD9, expect increased Rip Risk will continue over area beaches through the Holiday weekend. Have added a mention to the HWO. Also, risk for areas of minor coastal flooding/erosion (mainly lower Bay and along the Atlantic Coastal zones) has increased for later Saturday and Sunday. Will continue to monitor as forecast track information evolves over the next 24-36 hours. && .CLIMATE... Has been a rather hot and dry month of August over much of the area (quite a contrast to a summer that began very wet). Current Data Through 8/30: * Average Temperature * RIC: 80.3/ would rank as 6th warmest (warmest is 82.9 in 1900) * ORF: 81.4/ would rank as 2nd warmest (warmest is 81.9 in 1900) * SBY: 78.7/ would rank as 5th warmest (warmest is 80.3 in 1978) Based on forecast temperatures for today these rankings will likely stay as is. Richmond has only received 0.53" of rain for the month (if this stands (and it probably will) it will rank as the 3rd driest on record). && .AKQ WATCHES/WARNINGS/ADVISORIES... MD...None. NC...None. VA...None. MARINE...None. && $$ SYNOPSIS...MAS NEAR TERM...MAS/MPR SHORT TERM...LKB/MAS LONG TERM...MAM AVIATION...LSA MARINE...MAM TIDES/COASTAL FLOODING... CLIMATE...

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