Area Forecast Discussion
Issued by NWS Sterling, VA

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038 FXUS61 KLWX 170727 AFDLWX Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 327 AM EDT Fri Mar 17 2017 .SYNOPSIS...A warm front will move into the area late tonight into early Saturday before a cold front passes through Saturday afternoon. High pressure builds over the area early next week. Another cold front will cross the area on Tuesday. && .NEAR TERM /THROUGH TONIGHT/...High pressure will move over the Mid-Atlantic region this morning. Clear skies and light to calm winds have resulted in a cold morning. High pressure will move off the east coast by this afternoon and mid- high level clouds will move into the region from the west. Light southerly flow will result in temps climbing into the 40s/L50s today. Low pressure located over N MN this morning will move southeast across the Great Lakes today. A warm front will approach the region and overrunning will result in rain and snow showers moving across the region this afternoon. Snow showers will begin at the higher elevations where temps are cooler then as evaporative cooling occurs, snow will mix in with rain showers further east. A light dusting is possible north and west of the I-95 corridor this evening however sfc temps during this time will likely be above freezing and accumulation, if any would be on grassy surfaces. Snow showers are expected to result in light accumulation of around 1-2 inches across the Allegheny front during this time. Due to the marginal temperatures, advisory not expected at this time. Temps are going to stay steady if not rise overnight as the warm front pushes through the Mid-Atlantic region. Rain and snow showers will change to all rain by Saturday morning however favorable areas where cold air can get trapped mainly across western Maryland may result in fzra. Confidence is low as sfc temps will be marginal but depending on how cold they get this evening may result in light icing. No advisory issued during this time due to low confidence. && .SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/...Low pressure along a cold front will move through the region Saturday morning. A strong shortwave trough will lag behind the sfc feature and move overhead Saturday afternoon/evening. Pressure falls and mid- level forcing will likely lead to scattered rain showers across the region. Activity will move eastward by Saturday evening. Snow showers expected along and west of the Allegheny Front through Saturday night. Accumulations of 1-3 inches are possible during this time. The shortwave trough will move eastward Sunday and snow showers will come to an end in the mtns. && .LONG TERM /MONDAY THROUGH THURSDAY/...Rain showers expected late Monday and Mon night into early Tue as a cdfnt crosses the area. High pressure builds over the area during the middle of next week leading to cool and dry conditions. A developing storm system over the mid section of the country will draw milder air into the area for next weekend with a chance of showers for next weekend. && .AVIATION /07Z FRIDAY THROUGH TUESDAY/... VFR conditions expected today. Rain and snow showers are likely Friday afternoon-Saturday morning. The best chance for snow will be across KMRB with rain more likely elsewhere. Sub-VFR conditions are possible during this time. A cold front will cross the terminals Saturday. Scattered rain showers are possible Saturday afternoon. NW winds will increase behind the front. Rain showers late Mon and Mon night. Cdfnt crosses the area around 12Z Tue with shifting winds. High pressure then builds during the middle of next week. && .MARINE... High pressure moves off the east coast today. S winds will increase by Friday evening and SCA conditions are expected for portions of the waters through Saturday morning. A cold front will pass through Saturday and high pressure will approach Saturday night. A Small Craft Advisory may be needed for portions of the waters during this time. Cold and breezy conditions Sunday, some showers possible as front moves through. SCA conditions possible Mon night through Wed. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...Small Craft Advisory until 6 AM EDT early this morning for ANZ532>534-537-540-541-543. Small Craft Advisory from 8 PM this evening to 6 AM EDT Saturday for ANZ532>534-537-540-541-543. && $$ SYNOPSIS...LFR NEAR TERM...HSK SHORT TERM...HSK LONG TERM...LFR AVIATION...HSK/LFR MARINE...HSK/LFR

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