Baltimore Harbor & Patapsco River Marine Forecast
| Rest Of Today...E Winds 15 Kt With Gusts To 20 Kt. Waves 1 To 2 Ft. Showers. |
| Tonight...E Winds 10 To 15 Kt With Gusts To 20 Kt. Waves 1 To 2 Ft. Showers. |
| Sat...E Winds 15 To 20 Kt With Gusts To 25 Kt. Waves 2 Ft. Showers. |
| Sat Night...E Winds 10 To 15 Kt With Gusts To 20 Kt. Waves 1 To 2 Ft. Showers. |
| Sun...E Winds 5 To 10 Kt. Waves 1 Ft Or Less. Showers Likely. |
| Sun Night...Se Winds 5 Kt. Waves Flat. A Chance Of Showers. |
| Mon...S Winds Around 5 Kt. Waves Flat. A Chance Of Showers In The Morning. Showers Likely Through The Night, Then A Chance Of Showers After Midnight. |
| Tue...Se Winds Around 5 Kt. Waves Flat. A Chance Of Showers Through The Day. |
| Area Forecast Discussion ...UPDATED National Weather Service Baltimore MD/Washington DC 1003am EDT Fri May 22 2026 .WHAT HAS CHANGED... Cooler temperatures today as another round of showers lifts through the region this afternoon/evening. .KEY MESSAGES... - 1) Wet, cool pattern continues through the holiday weekend. - 2) Daily rain chances persist into early next week, with gradually warming temperatures. KEY MESSAGE 1...Wet, cool pattern continues through the holiday weekend. Generally light rain or drizzle today with another round of steadier, heavier rain moving into western areas from KY and TN after 21Z and persisting through 03Z based on HRRR (High-Resolution Rapid Refresh) forecasts and regional radar imagery. Later this morning a shortwave trough will lift from the Mid-South toward the OH Valley, and this drags a surface low with it that tracks toward the central Great Lakes. This is going to bring a round of steady rain to the area as the stalled front lifts north, though the better forcing looks to be just north of our area in PA. Rainfall amounts of 1-1.5" are forecast across the area, with up to 2" possible near the PA border. Given large rainfall deficits and severe drought conditions, the rainfall will be extremely beneficial. Rainfall tapers off briefly this evening, especially south of I-66. Another round of showers moves through tonight into Saturday as a slow moving inverted trough moves up along the coast. This trough could close off into a weak low off the Delmarva Saturday night into Sunday. Easterly winds could gust around 20-25 mph Saturday into Saturday night for those from Washington DC to northeast MD. Rainfall chances are likely to be lowest on Sunday as most of the upper forcing and frontal boundary lift away from the area. Well below normal temperatures in the mid 50s to lower 60s today and Saturday, then a warmup to the 70s on Sunday. KEY MESSAGE 2...Daily rain chances persist into early next week, with gradually warming temperatures. The frontal zone which is currently pushing southward to the Carolinas is expected to return to the region in time for Memorial Day. This is in response to a building of heigheights as a large subtropical ridge flexes northward from offshore of the southeastern U.S. The consequence of this boundary nearby will increase the risk of shower activity, and even some thunderstorms depending on the degree of diurnal heating. Eventually this mid/upper ridge begins to flatten in response to a series of northern stream impulses passing by to the north. This ultimately nudges the meandering boundary off to the south. Where this frontal system ends up settling will determine the degree of convective threat as well as potential warming trends. At this point, the multi-global ensemble system favors a slow but steady warm up next week with mid 70s to low 80s for most. Looking toward Thursday, all ensembles support a deep upper trough digging down from the Canadian Maritimes. This will help push the front back toward the south by late next week. Marine SCA (Small Craft Advisory) conditions are expected to continue through Saturday night. Then, an inverted trough slowly lifts north along the coast. The strongest winds are expected Saturday morning to afternoon, with peak gusts around 25 knots. A lull in winds with sub-SCA (Small Craft Advisory) conditions is likely on Sunday. Sub-advisory level winds are expected across the marine waters through Tuesday. Gradients should remain light with mainly southerlies on Monday before shifting back to north to easterlies by Tuesday. Tides / Coastal Flooding Increasing onshore flow through the weekend is going to raise tidal levels across the Chesapeake Bay. Annapolis could approach minor flood stage Saturday afternoon, and most other locations approach action stage. Winds weaken Sunday and that should allow water levels to drop. NOAA Baltimore MD/Washington DC Office: Watches - Warnings - Advisories DC...None. MD...Small Craft Advisory until 6am EDT Saturday for MDZ008. VA...None. WV...None. Marine Small Craft Advisory until 6am EDT Saturday for ANZ530>534- 537>543. |
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