Area Forecast Discussion
Issued by NWS Wakefield, VA

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410 FXUS61 KAKQ 250512 AFDAKQ AREA FORECAST DISCUSSION National Weather Service Wakefield VA 112 AM EDT Mon Mar 25 2019 .SYNOPSIS... Weak low pressure passes through Virginia tonight, with a stronger area of low pressure moving along an advancing cold front on Monday. The front pushes south of the area Monday night, with high pressure over the midwest building into the mid Atlantic and northeast states into Wednesday. && .NEAR TERM /UNTIL 8 AM THIS MORNING/... As of 915 PM EDT Sunday... Latest analysis indicates weak sfc low pressure moving across northern VA this evening with a fast moving WSW flow in place aloft. Skies have become partly/mostly cloudy this (high clouds), but conditions remain dry with dew pts still mostly in the 30s and temperatures in the 50s to lower 60s (except upper 40s eastern shore). Looking at satellite trends and the high res model data suggests a mostly cloudy night, though there may be some decrease in cloud cover after 06-09Z early Mon as this initial sfc low moves off to the east. Much milder than last night with lows primarily ranging from the upper 40s to the lower 50s (models show winds diminishing a bit towards daybreak to allow temperatures to fall to these levels). && .SHORT TERM /8 AM THIS MORNING THROUGH WEDNESDAY/... As of 915 PM EDT Sunday... Models are in fairly good agreement with the main area of sfc low pressure progged to be somewhere across the lower OH Valley as of 12Z/Mon. However, the sfc low looks to become rather broad/elongated by late morning into the aftn as it pushes into southern VA. With the front progged to become nearly parallel to the flow aloft, the boundary will have a difficult time pushing much to the south through the day. This makes for a challenging wind, temperature and precipitation forecast and the potential for a significant gradient across the CWA by aftn. Have raised highs a few degrees over NE NC and far southern VA near the NC border (into the lower 70s), while portions of the eastern shore will likely struggle to get out of the 50s (with falling temperatures during the late aftn). As for precipitation, models differ a bit on how much occurs ahead of the sfc low, but the forcing does not look very impressive out ahead of the boundary and sfc dew pts are only progged to be in the 40s to lower 50s so this has sort of an ana-frontal look to it (precip occurring mostly behind the frontal passage). Expect little to no precipitation in the morning and have lowered PoPs to only a chance over most of SE VA/NE NC through 21Z (5pm). Farther inland and to the north closer to the actual sfc low have maintained likely to categorical PoPs moving in between 18-21Z. At some point, the pcpn type will switch from a showery one to more of a stratiformed rain behind the fropa. NAM is quicker than the GFS with the wind shift. Some instability noted mainly south of VA ST RT 460 late aftn for a minimal thunder threat as the low and front push into the warmer air across the se. Highs for the day may occur before 18Z across the north. Will indicate a warm day ahead of the front with highs upr 50s-lwr 60s north with steady or falling temps after 18Z, with lower 70s across interior southern VA and interior NE NC. The entire system is slow to push off the coast Mon night. At this point the entire fa has nne winds behind the front so pcpn will be stratiformed. Highest PoPS in the eve, tapering off then ending across the north after midnight, but with chc PoPs persisting into early Tue morning across the se. Lows low- mid 30s north, upr 30s-mid 40s south. High pressure builds in from the north Tue thru Wed slowly pushing the coastal low farther out to sea. Look for pt to mstly sunny skies and cool once again. Highs Tue upr 40s-lwr 50s west of the Ches Bay, mid-upr 40s near the water. Cold Tue night with lows upr 20s- lwr 30s except mid 30 sern beaches. Highs Wed 50-55 west of the Ches Bay, 45- 50 near the water. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... As of 330 PM EDT Sunday... High pressure settles over the area then shifts offshore late in the week. This results in a dry period along with a slow warming trend. Lows Wed night in the 30s. Highs Thurs mid 50s-lwr 60s. Lows Thurs night upr 30s-mid 40s. Highs Fri lwr 60s-lwr 70s. Continued dry and mild Sat as a cold front and assctd moisture apprch but remain west of the mts. Highs mid 60s-mid 70s. Chc shwrs Sun as the front crosses the area. Highs mid 60s-lwr 70s. && .AVIATION /05Z MONDAY THROUGH FRIDAY/... As of 110 AM EDT Monday... High clouds have begun to spread over the area as a low pressure located over MO moves closer. CIGs will slowly lower from north to south but will remain VFR tonight into the morning hours. CIGs will begin to lower after 12z to 10-15k ft as a low develops east of the mountains in the VA Piedmont. A frontal boundary will form from north of KRIC to south of KSBY. North of the front will remain OVC throughout the day, while south of the front will be BKN. The cold front will move south in the late afternoon and winds will switch from the SW to N/NE and remain around 10 kt. Rain chances will increase after 20z and CIGs will become OVC 5-10 k ft. IFR CIGs will overspread the region after 26.00Z. Outlook: The low pressure will move south of the VA/NC border Monday night bringing widespread rain to the area along with possible IFR CIGs. VFR conditions will return Tuesday morning. A strong NE flow will set up along the SE VA/NE NC coast Monday and Tuesday with NNE winds of 25 kt with gust up to 40 kt at KORF and 20 kt with gust up to 35 kt at KECG. && .MARINE... As of 330 PM EDT Sunday... High pressure is centered along the NC OBX this afternoon, creating local winds SSW 10-15 kt. Waves/seas 1-2 ft. High pressure moves offshore tonight with SW winds 10-15 kt. Waves 1-2 ft; seas 2-4 ft. Models remain in good agreement that a cold front will drop south across the waters starting late Monday morning through early evening, with winds quickly turning to the NNE post-frontal. Strong north and northeast flow will follow the frontal passage with SCAs likely Monday night and Tuesday for the northern Ches Bay, rivers and coastal waters north of Parramore Island. Elsewhere, confidence continues to increase that Gales will occur late Monday night through Tuesday. Sfc low looks to slow/linger offshore Tuesday night and early Wednesday, thus likely lingering SCA into Wednesday, at least over over the lower Bay, Currituck Sound and southern coastal waters. Over the ocean, seas build rapidly Monday night into Tuesday given persistent/strong NE winds, reaching 5-8 feet N and 6-10 feet S on Tuesday. A high surf advisory will likely be needed for at least VA Beach south to Outer Banks Currituck. Even after winds diminish late Wednesday, an extended period of elevated seas appear likely over the coastal waters for much of the week ahead, given prolonged onshore flow through midweek. && .AKQ WATCHES/WARNINGS/ADVISORIES... MD...None. NC...None. VA...None. MARINE...Small Craft Advisory from 11 PM this evening to 7 PM EDT Tuesday for ANZ630-631-635>637. Gale Watch from late tonight through Tuesday evening for ANZ632-634-654. Gale Watch from late tonight through late Tuesday night for ANZ633. Small Craft Advisory from 11 PM this evening to 10 PM EDT Tuesday for ANZ638. Gale Watch from late tonight through late Tuesday night for ANZ656-658. Small Craft Advisory from 11 PM this evening to 7 AM EDT Wednesday for ANZ650-652. && $$ SYNOPSIS...LKB/MPR NEAR TERM...LKB SHORT TERM...LKB/MPR LONG TERM...MPR AVIATION...RHR/CP MARINE...JDM/MPR/MAM is the U.S. government's official web portal to all federal, state and local government web resources and services.