Baltimore Harbor & Patapsco River Marine Forecast
| Rest Of This Afternoon...Ne Winds 15 Kt With Gusts To 20 Kt. Waves 1 Ft. |
| Tonight...N Winds 10 To 15 Kt With Gusts To 20 Kt. Waves 1 Ft. |
| Fri...N Winds 10 To 15 Kt With Gusts To 20 Kt. Waves 1 Ft. |
| Fri Night...N Winds 10 To 15 Kt With Gusts To 25 Kt. Waves 1 To 2 Ft. |
| Sat...N Winds 15 To 20 Kt With Gusts To 25 Kt. Waves 2 Ft. A Chance Of Showers. |
| Sat Night...Nw Winds 15 Kt With Gusts To 25 Kt. Waves 1 To 2 Ft. A Chance Of Showers. |
| Sun...Nw Winds 10 To 15 Kt. Waves 1 Ft. A Chance Of Showers. |
| Mon...Nw Winds 5 To 10 Kt. Waves 1 Ft Or Less. |
| Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 238pm EDT Thu September 24 2026 .WHAT HAS CHANGED... The Coastal Flood Advisory for King George County was extended to encompass an additional high tide cycle as they are forecast to remain in minor flood stage through the weekend during the high tide cycles. Additionally, A Frost Advisory was issued for portions of the Alleghenies for tonight and into early Friday morning. .KEY MESSAGES... - 1) A Nor'easter brings below normal temperatures, breezy conditions, and gusty winds through this weekend. - 2) Warm and calm conditions next week before rainfall chances return by late next week. KEY MESSAGE 1...A Nor'easter brings below normal temperatures, breezy conditions, and gusty winds through this weekend. A Nor'easter will develop off the east coast this evening before tracking north towards New England. The proximity of the Nor'easter will bring increased cloud cover, below normal temperatures, and breezy conditions to the area through the weekend. Surface high pressure to the west will maintain dry conditions locally, although the tight pressure gradient will result in gusty winds daily. Cloud cover decreases overnight, with conditions favorable for radiational cooling leading to a Frost Advisory being issued for the western Alleghenies. While most of the area will dip into the 40s, higher elevations will see temperatures in the 30s. Temperatures as low as 33 degrees in the Alleghenies will result in frost formation. Below normal temperatures continue through the weekend with highs in the upper 60s to 70s and overnight lows in the 40s and 50s. Ensemble guidance continues to show a good bit of uncertainty regarding the exact track of the Nor'easter as it tracks offshore. Some solutions have the track further south and west, leading to gustier winds and potentially increased precipitation chances. While model guidance trended westward overnight, models this morning have backed off leading to continued uncertainty. KEY MESSAGE 2...Warm and calm conditions next week before rainfall chances return by late next week. As this Nor'easter advances further offshore, an upper level ridge builds over the Great Plains bringing higher pressure, calmer winds, and predominantly dry condtions to our region. A few showers could linger across northern Maryland monday morning should this weekend's Nor'easter track further west. Mid-level ridging building over the Midwest continues to raise daily temperatures throughout the week, warming into above-normal temperatures by the end of the week. A low pressure system advancing out of the Midwest brings humid conditions and chances for showers back to our region late next week. Marine Small Craft Advisories are in effect for all waters through Saturday morning with the exception of the lower portions of the Tidal Potomac and Chesapeake Bay. Here, a Gale Watch goes into effect Friday afternoon through early Saturday afternoon. Winds over the waters remain out of the north/northeast gusting 20 to 35 knots. High end Small Craft Advisory winds or potential Gale force winds continue through Saturday as the Nor'easter tracks nearby. If the Nor'easter were to track very close to the coast, Gale conditions would be likely with additional Gale headlines needing to be issued. Northeasterly winds persist through the beginning of next week. Depending on how close this weekend's Nor'easter tracks to the west, SCA (Small Craft Advisory) level gusts are likely to continue into Sunday before finally weakening below SCA (Small Craft Advisory) criteria on Monday. Tides / Coastal Flooding A long duration coastal flood event within persistent onshore flow is underway. Coastal Flood Warnings are in effect for Annapolis, Straits Point, and Alexandria through Friday. Coastal Flood Advisories are in effect for DC, Dahlgren, and Solomons Island through Thursday night. Further north along the Bay (Baltimore northward) anomalies are forecast to be lower due to a significant northerly component of the wind. The forecast gets very complicated later Friday into Saturday as a coastal low strengthens and potentially retrogrades westward toward the area. Model guidance shows an extreme amount of forecast spread with respect to tidal levels Friday afternoon through the weekend. This uncertainty is tied to uncertainty in the placement of the aforementioned coastal low, and whether its associated wind field will allow water to be able to start to drain out of the mouth of the Bay. Further coastal flood headlines may be needed during this time period, but it's also possible that water levels begin to decrease significantly starting Friday night. NOAA Baltimore MD/Washington DC Office: Watches - Warnings - Advisories DC...Coastal Flood Advisory until 9am EDT Friday for DCZ001. MD...Small Craft Advisory until 2pm EDT Saturday for MDZ008. Coastal Flood Warning until 11am EDT Friday for MDZ014. Coastal Flood Advisory until 7am EDT Friday for MDZ016. Coastal Flood Warning until 5pm EDT Friday for MDZ017. Coastal Flood Advisory until 8am EDT Friday for MDZ018. Frost Advisory from 1am to 9am EDT Friday for MDZ509-510. VA...Coastal Flood Advisory until 7am EDT Friday for VAZ057. Frost Advisory from 1am to 9am EDT Friday for VAZ503. Coastal Flood Warning until 10am EDT Friday for VAZ054. WV...Frost Advisory from 1am to 9am EDT Friday for WVZ501-505. Marine Small Craft Advisory until 2pm EDT Saturday for ANZ530>532- 535-536-538>542. Small Craft Advisory until 4pm EDT Friday for ANZ533-534-537- 543. Gale Watch from Friday afternoon through Saturday afternoon for ANZ533-534-537-543. |
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