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The Mallows Bay–Potomac River National Marine Sanctuary lies in an ecotone, a transition zone in the Potomac River where tides fluctuate between 1 and 2 feet (0.3 and 0.6 m) each day, mixing fresh water flowing into the sanctuary from farther up the river with salt water drawn northwards by the tides from the Chesapeake Bay. [25]
PDS Special marine warnings are issued by the National Weather Service to inform mariners of weather conditions that present a considerable threat to life and property. On April 19, 2018, the Baltimore/Washington, D.C. forecast office upgraded a special marine warning to PDS status as a gust front approached Chesapeake Bay. [11]
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Get the Chesapeake, VA local weather forecast by the hour and the next 10 days.
The Chesapeake Bay (/ ˈ tʃ ɛ s ə p iː k / CHESS-ə-peek) is the largest estuary in the United States. The bay is located in the Mid-Atlantic region and is primarily separated from the Atlantic Ocean by the Delmarva Peninsula, including parts of the Eastern Shore of Maryland, the Eastern Shore of Virginia, and the state of Delaware.
The storm, now about 340 miles southeast of Charleston, South Carolina, is expected to bring heavy rain and storm surge.
At some point, the lower limit was reduced to 23 miles per hour (20 knots). Today, however, most places have standardized on 25 to 38 miles per hour (22 to 33 knots), encompassing the combined ranges of forces 6 and 7 on the Beaufort scale. Winds strong enough to trigger a small craft advisory may be referred to as being advisory-force.
Each station transmits a NAVTEX broadcast six times a day, including two rebroadcasts of the general forecast. A NAVTEX broadcast includes maritime navigation warnings, weather forecasts, ice warnings, Gulf Stream locations, radio navigation information, rescue messages, and marine advisories. Each station has 2 NAVTEX transmitters.