Area Forecast Discussion
Issued by NWS Sterling, VA

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573 FXUS61 KLWX 150356 AFDLWX Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1056 PM EST Sat Jan 14 2017 .SYNOPSIS... High pressure will build over the area again through Sunday night. A stationary front over the southern mid-Atlantic states will return north as a warm front Tuesday and Tuesday night. A weak cold front will push through the area Wednesday. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...
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A wave of low pressure will continue to move across the Mid- aTlantic region tonight. Sfc high pressure is over the region resulting in winds less than 5 mph. Temperatures range from the U30S/L40s across central VA to the low 30s across northern MD. A strong warm nose as evident on the 00z IAD raob has led to freezing rain across areas adjacent to PA and around the Baltimore metro. A winter weather advisory and freezing rain advisory are in effect until 4 am when rain moves out of the region. Northwest winds will begin after midnight as high pressure from the Ohio Valley bleeds over the Highlands. Dry air advection will occur into Sunday morning. Low level moisture may linger longer along the Allegheny Front and drizzle/fz drizzle is possible into the morning hours.
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&& .SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY NIGHT/... Clouds will scatter out quickly during the morning becoming clear by afternoon under strengthening NNW flow. Temperatures will rise into the mid 40s. There could be enough lift and saturation over the central Shenandoah valley for some light rain or drizzle Sunday afternoon. Deeper moisture will start spreading back again into the area Sun night and Mon as a storm system begins to organize over the mid section of the country. Any precip looks to be light and in the form of rain. && .LONG TERM /TUESDAY THROUGH SATURDAY/... High pressure offshore the eastern U.S. Coast will interact with a low pressure system over the Great Lakes region Tuesday and Tuesday night to produce a mild southerly flow. Along with milder temperatures will be the threat for rain, moderate at times, later on Tuesday into Tuesday night. An associated cold front will move across the region as the low pressure system pushes across northern New England Wednesday into Wednesday night. The chance for rain may linger Wednesday, but then should taper to partial clearing skies, cooler temperatures, and perhaps some upslope snow showers in the higher elevations of the Appalachians. High pressure should build across the region Thursday and Thursday night before moving offshore the eastern U.S. Coast by Friday. Drier conditions with seasonable to mild temperatures are anticipated each period. A warm front should work its way northward up the Appalachian Front later Friday into Friday night, bringing a chance for a few rain showers. During the day Saturday, a second, more stronger warm front could work its way northward across the central and eastern parts of our region. Even milder air and the chance for rain showers exist with this warm front as well. && .AVIATION /04Z SUNDAY THROUGH THURSDAY/... -RA will continue this evening before ending by midnight. IFR/LIFR conditions are expected outside the rain and into the overnight hours. Conditions will likely improve in the early morning hours as NNW flow strenthens. VFR conditions expected Sunday and Sunday night. Clouds return Sunday night into Monday. -RA is expected mainly at MRB/CHO. There is a slight chance of -FZRA at MRB into Monday morning. Cig restrictions are possible Monday-Monday night. Mvfr or ifr conditions Tuesday. Ifr to lifr conditions Tuesday night with rain showers increasing in coverage. Winds south around 5 knots Tuesday, becoming southwest 5 to 10 knots Tuesday night. && .MARINE... Light and variable winds tonight. Northerly channeling will increase Sunday morning. Gusts around 18kts are expected across the lower Tidal Potomac and south of Drum Point and Tangier Sound. A SCA is in effect through mid-day Sunday. Light winds expected on the waters through Monday night. No marine hazards Tuesday and Tuesday night. && .LWX WATCHES/WARNINGS/ADVISORIES...
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DC...None. MD...Winter Weather Advisory until 4 AM EST Sunday for MDZ003>006- 501-502-507. Freezing Rain Advisory until 4 AM EST Sunday for MDZ011-503- 505-506-508. VA...None. WV...Winter Weather Advisory until 4 AM EST Sunday for WVZ051-503- 504. MARINE...Small Craft Advisory from 6 AM to noon EST Sunday for ANZ534- 537-543.
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&& $$ SYNOPSIS...LFR NEAR TERM...HSK/LFR SHORT TERM...LFR LONG TERM...KLW AVIATION...HSK/LFR/KLW MARINE...HSK/LFR/KLW

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