Area Forecast Discussion
Issued by NWS Sterling, VA

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721 FXUS61 KLWX 210045 AFDLWX Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 845 PM EDT Fri Oct 20 2017 .SYNOPSIS... High pressure will remain in control of the region through early next week. A strong cold front will move through the area on Tuesday. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
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High pressure will remain overhead tonight...bringing mainly clear skies along with light winds. Another good setup for radiational cooling is expected with lows ranging from the mid to upper 40s in the Valleys and rural areas to the mid and upper 50s in urban areas.
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High pressure at the sfc and aloft will remain in control over the region through Monday maintaining fair weather with pleasant afternoons and cool nights.
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&& .LONG TERM /MONDAY THROUGH FRIDAY/... Monday starts dry with southerly flow and temperatures rising to the mid-70s for most locations over our CWA. A strong cold front approaches from the west later on Monday and into Tuesday as low pressure deepens tracking N-NE through the front. A deep trough will settle over the eastern CONUS and slowly push east. Precipitation associated to this system could start as early as Monday night, but the cold front will move east across our region on Tuesday, when the heavier precipitation is expected. Current guidance has PW values between 1 and 1.5 inches. Cold air advection behind the front and a tight pressure gradient will allow for colder temperatures and gusty winds at times. High temperatures will be in the 60s and 70s, with Wednesday and Thursday being the coldest days... only reaching the low 60s or 50s at higher elevations. Upper trough axis will move across over our region Wednesday into Thursday, with some showers possible over our area. High pressure builds in into Friday. && .AVIATION /01Z SATURDAY THROUGH WEDNESDAY/... No significant wx expected into early next week under high pressure surface and aloft. VFR/dry conditions expected for part of Monday. Precipitation expected Monday night into Tuesday bringing sub-VFR conditions at times. && .MARINE... High pressure in control into early next week with excellent weather. No small craft advisory expected on Monday. Gale conditions possible on Tuesday on strong srly winds. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...None. && $$ SYNOPSIS...LFR NEAR TERM...BJL/LFR SHORT TERM...LFR LONG TERM...IMR AVIATION...BJL/IMR/LFR MARINE...BJL/IMR/LFR is the U.S. government's official web portal to all federal, state and local government web resources and services.