* WHAT. North winds 10 to 20 kt with gusts up to 25 kt. * WHERE. Chesapeake Bay from Pooles Island MD to Smith Point VA, Tidal Potomac from Cobb Island MD to Smith Point VA, Chester River to Queenstown MD, Eastern Bay, Choptank River to Cambridge MD and the Little Choptank River, and Tangier Sound and the inland waters surrounding Bloodsworth Island. * WHEN. Until 6 AM EDT Friday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. North winds 10 to 15 kt with gusts up to 20 kt. * WHERE. Chesapeake Bay from Pooles Island MD to Smith Point VA, Tidal Potomac from Cobb Island MD to Smith Point VA, Choptank River to Cambridge MD and the Little Choptank River, and Tangier Sound and the inland waters surrounding Bloodsworth Island. * WHEN. Until 6 AM EDT Friday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. Sub-freezing temperatures in the upper 20s to lower 30s. * WHERE. Portions of western Maryland, northwest and western Virginia, and eastern West Virginia. * WHEN. Until 9 AM EDT this morning. * IMPACTS. Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

* WHAT. Temperatures in the mid 30s will result in frost formation. * WHERE. In Maryland, Washington and Central and Eastern Allegany Counties. In Virginia, Clarke, Frederick, and Warren Counties. In West Virginia, Hampshire, Berkeley, Jefferson, and Morgan Counties. * WHEN. Until 9 AM EDT this morning. * IMPACTS. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.