Storm Warnings are issued for the Tidal Potomac River and the Chesapeake Bay when one or both of the following conditions is expected to begin within 36 hours and not directly associated with a tropical cyclone: 1) sustained winds of 48 knots to 63 knots . OR . 2) frequent gusts (duration of two or more hours) of 48 knots to 63 knots More @Wikipedia
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