Baltimore Harbor & Patapsco River Marine Forecast
| This Afternoon...E Winds 5 To 10 Kt. Waves 1 Ft. |
| Tonight...Se Winds 5 To 10 Kt. Waves 1 Ft. |
| Sat...E Winds 5 Kt. Waves Less Than 1 Ft. |
| Sat Night...E Winds Around 5 Kt. Waves Flat. |
| Sun...E Winds 5 Kt. Waves Flat. |
| Sun Night...S Winds 5 Kt. Waves Flat. |
| Mon...S Winds 5 To 10 Kt. Waves 1 Ft Or Less. A Chance Of Showers And Tstms. |
| Tue...S Winds 5 To 10 Kt...Becoming Nw After Midnight. Waves 1 Ft. Showers With A Chance Of Tstms. Winds And Waves Higher And Visibilities Lower In And Near Tstms. |
| Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 327pm EDT Fri July 24 2026 .WHAT HAS CHANGED... Key Messages 1 & 2 were updated. .KEY MESSAGES... - Warming temperatures into the weekend with mainly hit and miss showers or thunderstorms. - Returning to a summer-like pattern next week. KEY MESSAGE 1...Warming temperatures into the weekend with mainly hit and miss showers or thunderstorms. KEY MESSAGE 1 DESCRIPTION... Several shortwave-troughs will traverse the region over the weekend, while at the surface, light southeasterly flow around retreating New England surface high will allow for moisture return into the area. Isolated showers are possible tonight across southwest areas as low-level moisture returns into the area. Warming temperatures and increasing instability may result in isolated to scattered showers and thunderstorms Sat into Sun, mainly west of the Blue Ridge Mountains. Moisture and instability increase further on Monday with greater coverage and convection spreading east of the Blue Ridge Mountains. KEY MESSAGE 2...Returning to a summer-like pattern next week. KEY MESSAGE 2 DESCRIPTION... Ensemble model guidance continues to favor a highly amplified pattern across the country next week. Mid/upper heigheights should continue to build across the Desert Southwest into the Great Plains region. At the same time, below average heigheights persist near Hudson Bay while extending down along the Eastern Seaboard as an elongated trough. This would support a mainly northwesterly flow regime as impulses track up and over the sprawling upper ridge across the middle of the U.S. These often have a tendency to produce convective complexes, some of which result in mesoscale convective systems (MCS). Thus, expect some uptick in convective chances during early portions of next week. One more formidable shortwave emerges on Tuesday which will be characterized by falling heights/pressures as well as increasing moisture advection. This coincides with ample instability rising into the 1,500 to 2,500 J/kg range. With enough vertical shear and height falls, global models support an active day of thunderstorm activity. Ensembles show some sagging of the surface isobaric pattern with its position indicative of a lee-side trough. This will likely be one focus for convection along with terrain circulations and the upstream cold front. Damaging wind gusts and torrential downpours are possible with any such storm. Given the later arrival of the front, the threat for storms may persist beyond the core diurnal heating hours. Models show this frontal zone sagging southward to near the Virginia- North Carolina border by mid-week. A shift to post-frontal northwesterlies should gradually quell the threat for thunderstorms. Dew points begin to fall with temperatures remaining seasonable. High temperatures largely top out in the upper 80s to low 90s which is close to climatology for late July. Overnight lows fall into the 60s most nights. Marine Light onshore flow 10 kt or less through the weekend. Overall, great boating weather through the weekend into early next week. Southerly winds pick up in intensity on Monday evening/night into Tuesday. Channeling effects could bring gusts to around 20 knots or so, which would be supportive of Small Craft Advisories, particularly across wider waters of the Chesapeake Bay. A convective threat increases through the day on Tuesday which would support the need of some Special Marine Warnings. Winds shift to northwesterly by Wednesday with gusts to around 10 to 15 knots. Tides / Coastal Flooding Tidal anomalies rebound within onshore flow this weekend, with more sensitive locations potentially reaching Action Stage through the weekend. Annapolis could approach minor flood thresholds early next week. NOAA Baltimore MD/Washington DC Office: Watches - Warnings - Advisories DC...None. MD...None. VA...None. WV...None. Marine None. |
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