Tidal Potomac from Indian Head to Cobb Island MD Marine Forecast
| Rest Of Today...S Winds 5 Kt. Waves Flat. A Slight Chance Of Rain Late This Morning, Then A Chance Of Rain This Afternoon. |
| Tonight...Se Winds Around 5 Kt. Waves 1 Ft. Rain. Vsby 1 To 3 Nm. |
| Sat...N Winds 5 To 10 Kt. Waves 1 Ft. A Chance Of Rain. |
| Sat Night...N Winds Around 5 Kt. Waves 1 Ft. |
| Sun...W Winds Around 5 Kt. Waves 1 Ft. |
| Sun Night...Nw Winds 5 Kt. Waves Less Than 1 Ft. |
| Mon...Se Winds Around 5 Kt. Waves 1 Ft. |
| Tue...S Winds 5 To 10 Kt. Waves 1 Ft. A Chance Of Rain In The Afternoon. Rain Likely Through The Night. |
| Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1150am EST Fri Nov 21 2025 Synopsis Rain chances return tonight into Saturday morning as an area of low pressure and series of fronts cross the region. High pressure briefly builds back into the area Sunday and Monday. Another wave of low pressure and front look to cross the area Tuesday into the middle part of next week. Near Term - Through Tonight Mid-morning update: Skies are cloudy across the area this morning, but precipitation remains off to our south and west. Some patchy fog is also present to the west of the Blue Ridge, especially within the Shenandoah Valley. Rain will only make very slow progress off toward the northeast through the rest of the day, potentially impacting portions of Central Virginia and the Central Shenandoah Valley later this afternoon. Previous discussion follows... Low pressure over Kansas early this morning is expected to track rapidly eastward today crossing our area late tonight or early Saturday. Light overrunning precipitation is expected to overspread the area this evening, although far southern areas along and south of I-64 may see some rain before the day ends. Rain continues overnight ending Saturday morning. About a quarter to half inch of rain is expected, particularly north of I-66. Temperatures will remain generally steady in the low 50s. Short Term - Saturday Through Sunday Night Low pressure will be exiting out of the area Saturday morning with rain ending by 18Z, perhaps sooner than that. Weak high pressure will build into the area Sunday into Monday with clear skies and above normal temperatures. Long Term - Monday Through Thursday A highly amplified split jet structure continues into next week. In advance of the series of upstream waves, a longwave ridge crosses the Eastern Seaboard on Monday. Eventually, a closed low across the Central Plains lifts toward the Ohio Valley late Monday into Tuesday morning. However, this feature does shear during the process while feeling the influence of the ridge. As this disturbance passes by to the north on Tuesday, the next system of interest begins to take shape over the middle of the country. An expansive longwave trough encompasses much of the Great Plains region on Tuesday. Height falls associated with this trough reach the East Coast by Wednesday night into Thanksgiving Day. The model suite shows an array of solutions, particularly on the timing fronts. Given this system is around 6 days out in time, uncertainty will likely continue for the next couple of days. The surface pattern next week consists of high pressure along the Eastern Seaboard for Monday. Eventually, this anticyclone edges offshore as warm advection ensues during the subsequent day or two. The pattern shift coupled with southwesterly flow aloft will increase the chances of rain on Tuesday, and again on Wednesday as the central U.S. system approaches from the west. Continued south-southwesterly winds will make for a mild day on Wednesday as highs rise well into the 60s (50s in the mountains). A stronger cold front pushes through around Thanksgiving Day leading to a bigger drop in temperatures. Precipitation chances will depend on how quickly this front makes it through the region. Marine Small Craft Advisories are possible Saturday in the wake of a frontal passage. Winds diminish Sat night through Sunday, but may increase again Sunday night in NW flow. High pressure will support sub-advisory winds for Monday with north to northwesterly gusts to around 10 knots. South to southeasterly winds increase by Tuesday ahead of the next system. This may lead to Small Craft Advisories across some of the waters. NOAA Baltimore MD/Washington DC Office: Watches - Warnings - Advisories DC...None. MD...None. VA...None. WV...None. Marine None. |
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