


Area Forecast Discussion
Issued by NWS Sterling, VA
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Issued by NWS Sterling, VA
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-- Discussion containing changed information from previous version are highlighted. --892 FXUS61 KLWX 280800 AFDLWX Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 400 AM EDT Sat Jun 28 2025 .SYNOPSIS...-- Changed Discussion --A warm front will lift northward through the area today, as an area of low pressure tracks across southern Quebec. A weakening cold front will drop southward into the area tomorrow. A much stronger cold front will move through the area on Tuesday.-- End Changed Discussion --&& .NEAR TERM /THROUGH TONIGHT/...-- Changed Discussion --The entire forecast area remains solidly within a CAD wedge early this morning. Low clouds are present across the entire area, and areas of drizzle are ongoing as well, especially to the east of the Blue Ridge. Some remnant showers are also ongoing across Central Virginia, but this activity is expected to decay over the next couple hours. High pressure off the New England coastline will retreat eastward into the Atlantic today as a shortwave and associated area of low pressure at the surface simultaneously move eastward across southern Ontario/Quebec. As this occurs, winds will turn southerly, which will allow the CAD wedge to finally break down. Early morning low-clouds will give way to mostly sunny skies by late morning/early afternoon, allowing temperatures to climb into the lower 90s by mid-late afternoon. Flow in the 850-925 hPa layer will become westerly, which will lead to downsloping off the Appalachians and cause a surface trough to form in the vicinity of I-81. This surface trough will likely serve as the primary focus for initiation of thunderstorms later this afternoon. An isolated storm or two could also fire along bay or river breezes. While some questions remain regarding just how high the areal coverage of storms will be, the general progression is expected to be for storms to form during the mid- afternoon hours along the surface trough in the vicinity of I-81, and then slowly drift off toward the east through the late afternoon and evening hours. Storms will mostly likely be in the vicinity of US-15 during the late afternoon hours, before making it closer to I-95 during the evening. Forecast soundings show strong instability (MLCAPE around 2000-3000 J/kg), but only modest flow through the column (around 15-20 knots in the mid-upper levels). Profiles are relatively moist in the mid-upper levels, so DCAPE is respectable, but not overly impressive at around 600-800 J/kg. Some storms may be locally strong to severe, with damaging winds being the primary threat. SPC currently has most of the forecast area outlooked in a Marginal Risk. Storms may also be capable of producing heavy rain, but should have some forward motion to the east. While an isolated instance or two of flash flooding can`t be ruled out, the threat looks to be lesser compared to preceding days. Storms should gradually wind down through the late evening hours with loss of daytime heating, with mainly dry conditions through the overnight hours. Some patchy fog can`t be ruled out late tonight, especially in locations that receive thunderstorms during the daylight hours today. Overnight low temperatures will be in the upper 60s to the west of the Blue Ridge, and lower to middle 70s further east.-- End Changed Discussion --&& .SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...-- Changed Discussion --A decaying cold front will drop southward into the area during the day tomorrow. This boundary will have little impact on temperatures, as most locations should still climb into the upper 80s and lower 90s. However, slightly drier air will start to filter in from the north, with precipitable water values dropping through the afternoon to the north of I-66/US-50. Further south, deeper moisture will remain in place. While an afternoon thunderstorm can`t be completely ruled out anywhere, the primary focus for storms should be within the deeper moisture to the south of I-66/US-50. SPC currently has much of the forecast area outlooked in a Marginal Risk for severe thunderstorms, driven by the potential for localized high winds caused by wet microbursts. We`ll remain within a hot and humid airmass on Monday, with temperatures once again climbing into the upper 80s and lower 90s. Afternoon showers and thunderstorms will once again accompany the heat and humidity. Coverage of storms may be a bit higher compared to Sunday, especially across the northern half of the forecast area.-- End Changed Discussion --&& .LONG TERM /TUESDAY THROUGH FRIDAY/...-- Changed Discussion --Monday and Tuesday should be the last few days of afternoon and evening convection as a front to the northwest on Monday moves through the region on Tuesday. Showers and thunderstorms, some strong to possibly severe, will accompany the front and also develop well ahead of the front on Monday with a prefrontal trough. Highs in the upper 80s to lower 90s both days. Height rises and building high pressure will result in seasonable temperatures and dry and tranquil conditions, finally, Wednesday and Thursday.-- End Changed Discussion --&& .AVIATION /07Z SATURDAY THROUGH WEDNESDAY/...-- Changed Discussion --IFR to LIFR conditions are ongoing at the terminals in association with low ceilings and drizzle. Rapid improvement is expected today after sunrise, with conditions likely becoming MVFR by mid-morning, and VFR by afternoon. Thereafter, prevailing VFR conditions are expected through Monday. Temporary restrictions due to thunderstorms may be possible each afternoon and evening. Today, MRB and CHO have the greatest chance of seeing impacts from storms, but a brief storm can`t be ruled out anywhere. Winds will be out of the south today, northwest tomorrow, and then south again on Monday. VFR conditions at all terminals Monday through Tuesday night with exception to brief MVFR conditions in strong thunderstorms each afternoon and evening.-- End Changed Discussion --&& .MARINE...-- Changed Discussion --Sub-SCA level winds are expected over the waters through Monday morning. Winds will generally be southerly today, light and variable on Sunday, and southerly again on Monday. Winds may reach low-end SCA levels within southerly flow by later Monday afternoon into Monday night. SMWs as a result of thunderstorm winds may be possible each afternoon or evening through Monday. No marine hazards Monday through Tuesday night with exception to any strong thunderstorms that develop near or over the waters Monday afternoon and evening and again Tuesday afternoon and evening.-- End Changed Discussion --&& .TIDES/COASTAL FLOODING...-- Changed Discussion --Easterly flow will become more southerly during the day today and result in water level rises with Annapolis likely to reach minor coastal flooding early this morning. Other sites may reach Action stage with the upcoming tide cycle.-- End Changed Discussion --&& .LWX WATCHES/WARNINGS/ADVISORIES...-- Changed Discussion --DC...None. MD...None. VA...None. WV...None. MARINE...None.-- End Changed Discussion --&& $$ SYNOPSIS...KJP NEAR TERM...KJP SHORT TERM...KJP LONG TERM...KLW AVIATION...KLW/KJP MARINE...KLW/KJP TIDES/COASTAL FLOODING...LWX