Area Forecast Discussion
Issued by NWS Sterling, VA

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655 FXUS61 KLWX 190124 AAA AFDLWX Area Forecast Discussion...UPDATED National Weather Service Baltimore MD/Washington DC 924 PM EDT Mon Jul 18 2016 .SYNOPSIS... A cold front will slowly pass through the area Tuesday through Tuesday night. High pressure will build overhead for Wednesday and Thursday. High pressure over the Atlantic will control the weather pattern for late in the week before a cold front approaches the area early next week. && .NEAR TERM /THROUGH TUESDAY/... Some instability still left in the area for showers and t-storms to continue for the next few hours. A cdfnt is located south of the Great Lks and will cross the area overnight into early Tue. We`ll keep showers in the fcst for the upslope areas and along the Chesapeake Bay for the overnight and have PoPs for the current activity over the Piedmont. Skies will likely clear in some areas overnight with patchy fog formation possible especially in areas that had some rain today. Cdfnt crosses the area early on Tue. A few showers or t-storms appear still possible mainly over southern areas. No severe wx is expected. && .SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/... The cold front should be located across Central Virginia Tuesday morning and is expected to stay nearly stationary through Tuesday which will result in dewpts elevated especially across the southern half of the outlook area and isolated showers and thunderstorms may initiate into the afternoon. Thunderstorms are expected to stay sub-severe at this time. Northerly winds should finally elevate humidity Tuesday night with dewpts dropping into the 50s from NW to SE. High pressure will build into the region Wednesday and dry conditions are expected. Temps will climb into the mid 80s by the afternoon with low dewpts giving a quick break from the heat and humidity. && .LONG TERM /THURSDAY THROUGH MONDAY/... While it remains dry, heat returns Thursday and Friday on south/southwesterly flow. Humidity still relatively mild Thursday (L60s)...but dewpoints return into the M/U60s by Friday. Hot and humid this weekend...with heat indices AOA 100F Saturday and near 100F Sunday. Diurnal shower and storm chances return with the increasing heat and humidity. && .AVIATION /01Z TUESDAY THROUGH SATURDAY/... Showers have ended at all airports. MVFR Vis possible at all airports overnight. VFR conditions expected Tuesday and into Wednesday as high pressure builds into the region. A cold front may push back into the region Tuesday afternoon and showers and thunderstorms are possible mainly across CHO. VFR expected Thursday through the weekend. Though, a few showers/storms possible Saturday and Sunday in the hot and humid airmass. && .MARINE...A cold front will pass through the waters Tuesday into Tuesday night. A few showers and thunderstorms are possible ahead of the boundary...especially across the middle portion of the Bay into the Potomac River. Locally gusty winds are possible in any thunderstorms that do develop. High pressure will build overhead Wednesday into Wednesday night. Mostly sub-SCA conditions expected for the end of the week and weekend, however brief intervals of gusts up to around 20 knots possible each night. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...None. && $$ SYNOPSIS...HAS NEAR TERM...LFR SHORT TERM...BJL/HAS LONG TERM...MSE AVIATION...MSE/LFR MARINE...MSE/LFR is the U.S. government's official web portal to all federal, state and local government web resources and services.