Area Forecast Discussion
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
798 FXUS61 KLWX 021428 AAA AFDLWX Area Forecast Discussion...UPDATED National Weather Service Baltimore MD/Washington DC 1028 AM EDT Sun Jun 2 2024 .SYNOPSIS... High pressure will slide offshore early today. Shower and thunderstorm chances return today into Monday as a quick moving low pressure system passes through the region. Dry conditions briefly return with high pressure Tuesday before shower and thunderstorm chances increase with a series of fronts mid to late next week. && .NEAR TERM /THROUGH TONIGHT/... Scattered showers are seen over the Allegheny Mountains with only Petersburg WV and Hot Springs VA reporting rain this morning. Substantial amount of dry air was seen on the 12Z IAD sounding below 500 mb. As showers try to move northeast, they are likely to fall apart or dissipate as dry air is likely too much to be overcome. Substantial moistening is not expected to occur until 00Z tonight. && .SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/... By Monday, we`ll continue to hold chances for showers and an isolated thunderstorm, especially in the afternoon. The coverage and intensity continue to look fairly tame given the mesoscale setup. Afternoon highs will increase as a result of southwesterly flow into the low to mid 80s for most areas aside from the mountains where mid 70s will be more common. Breaks in the clouds will build in throughout Monday night with lows dipping down into the upper 50s in the mountains to low to mid 60s further east towards the waters. Brief upper ridging will alleviate PoPs on Tuesday with only a 20 to 30 percent chance for an isolated shower or thunderstorm. Highs are expected to be in the upper 70s to low 80s for most areas with increasing cloud coverage as a result of incoming onshore flow to the area. Low end PoPs continue through the overnight hours with lows dropping down into the low to mid 60s. && .LONG TERM /WEDNESDAY THROUGH SATURDAY/... Guidance has come into better agreement on Wednesday as the ECMWF has trended more progressive, bringing warm frontal precip to the region by Wednesday afternoon. The cold front swings through Thursday into Friday with another round of showers and t-storms. Guidance remains inconsistent on if the upper trough associated with the frontal system cuts off as it moves into the Great Lakes with the ECMWF lagging behind the GFS and Canadian with this development. As a result, the 12z Euro solution is drier behind the cold front on Friday, while the GFS/CMC have some lingering shower activity Friday and into the weekend. && .AVIATION /15Z SUNDAY THROUGH THURSDAY/... Prevailing VFR conditions are expected into the beginning of the work week. For today, light variable winds will increase a bit with the departing area of high pressure. Cannot rule out a brief ceiling restriction with any shower or isolated thunderstorm that crosses the terminals. VFR conditions likely continue into Tuesday with weak upper ridging nearby building in across the area. Nonetheless, cannot completely rule out a stray shower or isolated thunderstorm. Shower and thunderstorms are possible both Wednesday and Thursday, especially during the afternoon and evening, which could bring restrictions to the terminals. && .MARINE... A Small Craft Advisory remains in effect for the lower waters of the central Chesapeake Bay through early this morning. Cannot completely rule out the need for a Special Marine Warning for any strong storms that cross the waters later today but the magnitude and intensity should be below severe thunderstorm warning criteria. Sub-SCA conditions are expected Tuesday and Wednesday. Showers and thunderstorms moving over the waters during the afternoon and evening hours could bring stronger gusts especially on Wednesday and Thursday afternoon. Special Marine Warnings cannot be ruled out during this period. && .TIDES/COASTAL FLOODING... Anamolies will continue to rise over the next few days with increasing onshore flow allowing some of the more sensitive sites to be around action stage with an outside chance for minor tidal flooding. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...Small Craft Advisory until noon EDT today for ANZ534-543. && $$ SYNOPSIS...LFR NEAR TERM...LFR SHORT TERM...LFR LONG TERM...CAS AVIATION...LFR/CAS MARINE...LFR/CAS TIDES/COASTAL FLOODING...LWX