Baltimore Harbor & Patapsco River Marine Forecast
| Rest Of Tonight...S Winds 10 Kt With Gusts To 20 Kt. Waves 1 Ft. |
| Thu...S Winds 5 To 10 Kt With Gusts To 20 Kt. Waves 1 Ft. Rain Likely. |
| Thu Night...Sw Winds 5 To 10 Kt. Waves 1 Ft Or Less. A Chance Of Rain. |
| Fri...N Winds 5 Kt. Waves Flat. A Chance Of Rain. |
| Fri Night...Light Winds...Becoming Nw 5 To 10 Kt After Midnight. Waves 1 Ft Or Less. |
| Sat...Nw Winds 10 To 15 Kt With Gusts To 20 Kt. Waves 1 Ft. |
| Sat Night...Nw Winds 10 To 15 Kt With Gusts To 20 Kt. Waves 1 Ft. |
| Sun...Nw Winds 10 To 15 Kt. Waves 1 Ft. |
| Mon...W Winds 10 To 15 Kt...Diminishing To 5 Kt. Waves 1 Ft. |
| Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 932pm EST Wednesday Nov 4 2026 .WHAT HAS CHANGED... Have increased precipitation chances a bit toward the Shenandoah Valley given current radar trends. Otherwise, the forecast remains on track. .KEY MESSAGES... - 1) Above normal warmth through Friday with some rain across the region. - 2) Cooler, but seasonable temperatures and Appalachian rain showers expected this weekend as an upper disturbance moves to the north and adjacent to the region. KEY MESSAGE 1...Above normal warmth through Friday with some rain across the region. A large upper trough over the western Great Lakes will steadily move north and east into southern Ontario through the end of this week. A leading shortwave ahead of it is set to move across the central Alleghenies and Mid-Atlantic tonight into Thursday. This has begun to produce scattered light showers, generally from the Shenandoah Valley westward. Low-level profiles have begun to saturate so some of this likely has begun to reach the ground. A few tenths of an inch of rain are forecast along and west of the Blue Ridge, which won't be much but still something after over two weeks of no rain. Those east of the Blue Ridge likely see less rain due to lingering low- level dry air and loss of upper level support as the shortwave quickly moves east of the area. Aside from a few showers in the afternoon, most locations are going to be dry through Thursday evening. Conditions look favorable for a band of heavier rain to redevelop just east of I-95 Thursday night into Friday. This is due to the interaction of the surface high over the western Atlantic and the approaching strong upper trough from the OH Valley. A narrow band of frontogenesis likely develops where low-level convergence is maximized near the right-entrance region of a strengthening jet streak, and aided by modest moisture advection. The current forecast has around 1-1.25" of rain over southern Maryland, though some of the higher end ensemble guidance indicate upwards of 2" is possible. Not expecting any flood concerns due to the location of where this is going to occur and lack of precipitation in recent weeks. There is going to be a sharp cutoff in rain amounts to the west of the main band where rain is light and passive. As the upper trough swings through the region Friday night, the main mid-level vorticity associated with it cuts off and that takes about another 24-36 hours to move east over the Atlantic. While conditions dry out for most of us by Friday evening, there will be upslope rain showers in the Alleghenies through Saturday morning. Above normal temperatures continue through Friday with highs reach the 70s each day. Cloud cover and some cold advection Friday keep highs a bit cooler, but only in the upper 60s to around 70F. A colder airmass finally sweeps in behind the FROPA Friday night as lows drop to the upper 30s to upper 40s. KEY MESSAGE 2...Cooler, but seasonable temperatures and Appalachian rain showers expected this weekend as an upper disturbance moves to the north and adjacent to the region. An upper level disturbance will follow a low pressure system to the northeast and east of the region Saturday into Sunday. This disturbance will bring cloud cover to the western and northern areas as well as rain showers in the Appalachians Saturday. Otherwise, dry conditions with a gusty breeze is anticipated throughout the weekend and into the early part of next week. There should be less wind Tuesday. Temperatures will be cooler than recent days but should be close to seasonable Saturday through Tuesday. Highs should be in the lower to middle 60s with cooler temperatures in the mountains Saturday through Tuesday. Lows mid 30s to lower 40s each night. Marine A cold front is forecast to move across the local waters tonight through Friday. Ahead of the front southerly channeling will cause in increase in winds over most of the waters. Small Craft Advisories go into effect late this evening and continue through Thursday afternoon. Winds abate Thursday night into Friday, then the cold front sweeps through Friday evening. SCA (Small Craft Advisory) conditions are likely in wake of the front Friday night. Small Craft Advisories likely Saturday and Sunday. Small Craft possible Monday. Winds northwest 15 to 20 knots gusts 25 to 30 knots. Tides / Coastal Flooding Current tidal anomalies are running around 0.50 to 0.75 feet. Expect these to gradually rise in response to southerly flow ahead of a cold front. This will bring a few locations into Action stage through Thursday afternoon before water levels drop behind the departing cold front. NOAA Baltimore MD/Washington DC Office: Watches - Warnings - Advisories DC...None. MD...Small Craft Advisory until 3pm EST Thursday for MDZ008. VA...None. WV...None. Marine Small Craft Advisory until 3pm EST Thursday for ANZ530>533- 535-539>541. |
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