Coastal Flood Advisory for Anne Arundel, Lingering Clouds & Patchy Fog, Then Frost Returns West of the Blue Ridge Monday Night

The weekend is going out the way it came in — gray, damp-feeling, and stubborn. NWS Baltimore/Washington (2:44 PM advisory) and Mount Holly (3:07 PM) both describe a cold air damming wedge that just won’t quit: low stratus, patchy drizzle, and fog holding on through the night before a cold front finally scrubs it all out before Monday’s sunrise. Wakefield’s office, covering our southernmost reaches, notes rain tapering off from northwest to southeast this evening as a coastal front slides out to sea. The headline act tonight, though, is minor tidal flooding in Anne Arundel County around high tide — a Coastal Flood Advisory is up for Annapolis and the surrounding tidal zone.

Overnight Timeline

• Evening (now–10 PM): Lingering low stratus statewide, with a few pockets of drizzle possible, mainly central and southern Maryland. On the Eastern Shore and at Ocean City, a slight chance of light rain continues into early evening before tapering.
• Late evening–predawn (10 PM–5 AM): Clouds hang tough, patchy fog develops widely, especially river valleys, the Eastern Shore, and spots tucked along the Bay. High tide in Annapolis brings the minor tidal flooding risk to a peak.
• Predawn Monday (around 5–7 AM): A cold front sweeps through from west to east, finally clearing out the clouds and fog. Expect this front to clear western Maryland first, then push through central Maryland and off the Shore by mid-morning.

County by County Tonight

Western Maryland

Garrett County (Deep Creek/Oakland): Low near 45° — upper 40s in sheltered valleys, nudging the mid-40s at higher elevations. Partly cloudy, light west winds, essentially no rain concern (4%). A calm, cool mountain night.
Allegany County (Cumberland): Low around 50°, mostly cloudy with light north winds. Just a touch of residual drizzle risk (7%), otherwise quiet.

Northern & Central Maryland

Washington County (Hagerstown): Low around 54°, mostly cloudy, winds light out of the northwest. Essentially dry.
Frederick & Carroll Counties: Low near 56°, patchy fog developing as the evening’s 64° gives way to overnight cooling. Light, nearly calm winds.

Baltimore Metro

Baltimore City & County, Harford, Howard, Anne Arundel: Low around 59°, patchy fog likely overnight, especially near the water and low-lying spots. Light north winds. Anne Arundel carries the added note of the Coastal Flood Advisory around high tide — minor splashover is possible near Annapolis shoreline roads.

DC Suburbs

Montgomery & Prince George’s Counties: Low around 56°, patchy fog, calm-to-light northwest winds. A gray, soft night — nothing more.

Southern Maryland

Charles, Calvert, St. Mary’s: Low around 57°, areas of drizzle giving way to patchy fog, with a slightly higher rain chance (20%) than points north and west. Light north winds. Calvert and the shoreline communities should also keep an eye on the tide cycle tonight given the regional coastal flood concern, even though the advisory itself is specific to Anne Arundel.

Upper Eastern Shore

Cecil, Kent, Queen Anne’s, Talbot, Caroline: Low around 58°, patchy fog, with a 17% chance of a passing light shower before conditions dry out. Light north winds.

Lower Eastern Shore

Dorchester, Wicomico, Somerset: Low around 58°, a slight chance of light rain early tonight (24%) before patchy fog takes over. Light north to northeast winds.

Ocean City & the Coast

Worcester County: Low around 60°, a continued chance of light rain early this evening (33%) tapering to patchy fog overnight. North winds around 8 mph. Surf running 2 to 3 feet, water in the mid-60s, and a Moderate Rip Current Risk remains in effect into this evening — stay cautious in the surf even after sunset swims lose their appeal. High tide at the Ocean City Fishing Pier was early afternoon; low tide falls near the mid-morning hours Monday.

Winds & Marine

Light north to northeasterly flow holds through tonight across the Bay and tidal rivers — generally 5 to 10 knots. LWX notes the real wind action waits for Monday, when a cold front crosses the waters and winds shift west-to-northwest with gusts up to 20 knots expected Monday afternoon into the overnight — Small Craft Advisories look likely for portions of the Bay by then. For tonight, boaters and waterfront residents in Anne Arundel should mainly watch the tide line, not the wind.

Looking Ahead

Monday: The front clears skies out for a mostly sunny day. Highs reach the upper 60s to mid-70s across central and southern Maryland (around 69–71° Baltimore/DC/Southern MD, around 68° Hagerstown, around 72–73° the Shore), with 60s across the mountains (59° Garrett, 68° Cumberland). Gusty northwest winds, 20 to 25 mph, arrive behind the front.

Monday Night into Tuesday: This is the one to watch out west. Strong Canadian high pressure builds in, and areas of frost are expected west of the Blue Ridge — Garrett County lows near 35°, with Allegheny ridgetops flirting with the freezing mark. East of the Blue Ridge stays frost-free with lows generally in the 40s (42–50° across central Maryland, Southern Maryland, and the Shore). Tuesday itself turns cool, crisp, and sunny with highs in the 60s (mid-50s to upper 50s in the mountains).

Beyond that, dry and gradually milder weather holds Wednesday through Saturday as high pressure keeps its grip, with highs climbing back into the 70s. There are early signs of a possible rain-maker arriving next Sunday as low pressure tracks north from the Gulf, but confidence is low this far out — we’ll keep tracking it.

Data: NWS Baltimore/Washington, Mount Holly & Wakefield.
MDWA will be back with your Monday morning edition. Sleep well, Maryland — the fog will clear.