* WHAT. For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 28 possible. * WHERE. Adams, Cumberland, Dauphin, Lancaster, and York Counties. * WHEN. For the Frost Advisory, from 3 AM to 9 AM EDT Sunday. For the Freeze Watch, from late Sunday night through Monday morning. * IMPACTS. Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

* WHAT. For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 28 possible. * WHERE. Adams, Cumberland, Dauphin, Lancaster, and York Counties. * WHEN. For the Frost Advisory, from 3 AM to 9 AM EDT Sunday. For the Freeze Watch, from late Sunday night through Monday morning. * IMPACTS. Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

* WHAT. Sub-freezing temperatures as low as 30 expected. * WHERE. Portions of DC, central, northeast, northern, and southern Maryland, and central and northern Virginia. * WHEN. From 2 AM to 9 AM EDT Monday. * IMPACTS. Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

* WHAT. For the Frost Advisory, temperatures as low as 35 will result in frost formation. For the Freeze Warning, sub-freezing temperatures as low as 30 expected. * WHERE. Northwest Howard, Northwest Montgomery, Carroll, Frederick MD, Northern Baltimore, and Northwest Harford Counties. * WHEN. For the Frost Advisory, until 9 AM EDT this morning. For the Freeze Warning, from 2 AM to 9 AM EDT Monday. * IMPACTS. Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

* WHAT. For the Frost Advisory, temperatures as low as 34 will result in frost formation. For the Freeze Warning, sub-freezing temperatures as low as 30 expected. * WHERE. Adams, Cumberland, Dauphin, Lancaster, and York Counties. * WHEN. For the Frost Advisory, until 9 AM EDT this morning. For the Freeze Warning, from 2 AM to 9 AM EDT Monday. * IMPACTS. Frost and freeze conditions could kill sensitive outdoor plants if left uncovered.

* WHAT. North winds 10 to 15 kt with gusts up to 25 kt. * WHERE. Tidal Potomac from Indian Head to Cobb Island MD. * WHEN. Until 10 AM EDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. North winds 10 to 15 kt with gusts up to 25 kt. * WHERE. Chesapeake Bay main channel north of 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 10 AM EDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.