* WHAT. For the Small Craft Advisory, south winds 10 to 20 kt with gusts up to 30 kt expected. * WHERE. Chesapeake Bay from Pooles Island MD to Drum Point MD, 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 Patuxent River to Broomes Island MD. * WHEN. Until 6 PM EDT this evening. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. South winds 10 to 20 kt with gusts up to 25 kt expected. * WHERE. Tidal Potomac River from Key Bridge to Cobb Island MD, Chesapeake Bay north of Pooles Island MD, and Patapsco River including Baltimore Harbor. * WHEN. From 10 AM to 6 PM EDT Today. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. Dangerously hot conditions with heat index values up to 110 expected. * WHERE. Portions of central and southern Maryland, The District of Columbia, and portions of the northern neck of Virginia. * WHEN. From noon today to 8 PM EDT. * IMPACTS. Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS. Very warm and humid conditions will persist into the overnight hours. Ensure to stay hydrated and find ways to stay cool.

* WHAT. Heat index values up to 108 expected. * WHERE. Portions of central and northern Maryland, portions of northern and central Virginia. * WHEN. From noon today to 8 PM EDT. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

* WHAT. South winds 10 to 20 kt with gusts up to 25 kt expected. * WHERE. Tidal Potomac River from Key Bridge to Cobb Island MD, Chesapeake Bay north of Pooles Island MD, and Patapsco River including Baltimore Harbor. * WHEN. From 10 AM to 6 PM EDT Today. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. For the Small Craft Advisory, south winds 10 to 20 kt with gusts up to 25 kt expected. * WHERE. Chesapeake Bay from Pooles Island MD to Drum Point MD, 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 Patuxent River to Broomes Island MD. * WHEN. Until 6 PM EDT this evening. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. Heat index values of 105 to 109 degrees are expected. * WHERE. Dorchester, Somerset, and Wicomico Counties. * WHEN. From 11 AM this morning to 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. For the Dense Fog Advisory, dense fog will reduce visibility to 1/2 NM or less. For the Small Craft Advisory, south winds 15 to 20 kt with gusts up to 25 kt and rough waters expected. * WHERE. Delaware Bay waters south of East Point NJ to Slaughter Beach DE. * WHEN. For the Dense Fog Advisory, until 2 PM EDT this afternoon. For the Small Craft Advisory, from 2 PM this afternoon to 2 AM EDT Thursday. * IMPACTS. Conditions will be hazardous to small craft. Low visibility will make navigation difficult.

* WHAT. South winds 15 to 20 kt with gusts up to 25 kt and rough waters expected. * WHERE. Delaware Bay waters north of East Point NJ to Slaughter Beach DE. * WHEN. From 2 PM this afternoon to 2 AM EDT Thursday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. For the Dense Fog Advisory, dense fog will reduce visibility to 1/2 NM or less. For the Small Craft Advisory, south winds 15 to 20 kt with gusts up to 25 kt and rough waters expected. * WHERE. Delaware Bay waters south of East Point NJ to Slaughter Beach DE. * WHEN. For the Dense Fog Advisory, until 2 PM EDT this afternoon. For the Small Craft Advisory, from 2 PM this afternoon to 2 AM EDT Thursday. * IMPACTS. Conditions will be hazardous to small craft. Low visibility will make navigation difficult.

* WHAT. For the Dense Fog Advisory, dense fog will reduce visibility to 1/2 NM or less. For the Small Craft Advisory, south winds 10 to 20 kt with gusts up to 25 kt and seas 3 to 6 ft expected. * WHERE. Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm and Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm. * WHEN. For the Dense Fog Advisory, until 2 PM EDT this afternoon. For the Small Craft Advisory, from 2 PM this afternoon to 6 AM EDT Friday. * IMPACTS. Conditions will be hazardous to small craft. Low visibility will make navigation difficult.

* WHAT. For the Dense Fog Advisory, dense fog will reduce visibility to 1/2 NM or less. For the Small Craft Advisory, south winds 10 to 20 kt with gusts up to 25 kt and seas 3 to 6 ft expected. * WHERE. Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm and Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm. * WHEN. For the Dense Fog Advisory, until 2 PM EDT this afternoon. For the Small Craft Advisory, from 2 PM this afternoon to 6 AM EDT Friday. * IMPACTS. Conditions will be hazardous to small craft. Low visibility will make navigation difficult.

* WHAT. For the Dense Fog Advisory, dense fog will reduce visibility to 1/2 NM or less. For the Small Craft Advisory, south winds 10 to 20 kt with gusts up to 25 kt and seas 3 to 5 ft expected. * WHERE. Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm and Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm. * WHEN. For the Dense Fog Advisory, until 2 PM EDT this afternoon. For the Small Craft Advisory, from 2 PM this afternoon to 6 AM EDT Friday. * IMPACTS. Conditions will be hazardous to small craft. Low visibility will make navigation difficult.

* WHAT. For the Dense Fog Advisory, dense fog will reduce visibility to 1/2 NM or less. For the Small Craft Advisory, south winds 10 to 20 kt with gusts up to 25 kt and seas 3 to 5 ft expected. * WHERE. Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm and Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm. * WHEN. For the Dense Fog Advisory, until 2 PM EDT this afternoon. For the Small Craft Advisory, from 2 PM this afternoon to 6 AM EDT Friday. * IMPACTS. Conditions will be hazardous to small craft. Low visibility will make navigation difficult.

* WHAT. Heat index values up to 107. * WHERE. In Delaware, Kent and Inland Sussex Counties. In Maryland, Caroline, Kent MD, Queen Annes, and Talbot Counties. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 106. * WHERE. Atlantic, Cumberland, and Salem Counties. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 108. * WHERE. Portions of northern Delaware, central, northern, and southern New Jersey, and southeast Pennsylvania. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.