* WHAT. Heat index values up to 100 expected. * WHERE. Portions of central New York and northeast Pennsylvania. * WHEN. From noon today to 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerous rip currents expected. * WHERE. Kings (Brooklyn), Southwest Suffolk, Southeast Suffolk, Southern Queens and Southern Nassau Counties. * WHEN. From Wednesday morning through Wednesday evening. * IMPACTS. Life-threatening rip currents are likely for all people entering the surf zone. Anyone visiting the beaches should stay out of the surf. Rip currents can sweep even the best swimmers away from shore into deeper water.

* WHAT. Heat index values up to 99. * WHERE. Northern Fairfield, Northern Middlesex, Northern New Haven, Northern New London, Southern Fairfield, and Southern New Haven Counties. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 102. * WHERE. Northern Westchester, Orange, Putnam, Rockland, and Southern Westchester Counties. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 100. * WHERE. Bronx, Kings (Brooklyn), New York (Manhattan), Northern Queens, Richmond (Staten Island), and Southern Queens Counties. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 99. * WHERE. Northern Nassau, Northwest Suffolk, and Southern Nassau Counties. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 104. * WHERE. Eastern Bergen, Eastern Essex, Eastern Passaic, Eastern Union, Hudson, Western Bergen, Western Essex, Western Passaic, and Western Union Counties. * WHEN. Until 8 PM EDT Wednesday. * 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 25 kt with gusts up to 30 kt and seas 3 to 5 ft expected. * WHERE. Coastal waters from Sandy Hook to Little Egg Inlet NJ out 20 nm. * WHEN. For the Dense Fog Advisory, until 2 PM EDT Wednesday. For the Small Craft Advisory, from 2 PM Wednesday to 6 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 15 to 25 kt with gusts up to 30 kt and seas 3 to 5 ft expected. * WHERE. Coastal waters from Sandy Hook to Little Egg Inlet NJ out 20 nm. * WHEN. For the Dense Fog Advisory, until 2 PM EDT Wednesday. For the Small Craft Advisory, from 2 PM Wednesday to 6 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 1/4 to 1/2 NM. For the Small Craft Advisory, south winds 15 to 20 kt with gusts up to 25 kt and seas 4 to 6 feet expected. * WHERE. Sandy Hook NJ to Fire Island Inlet NY out 20 nm. * WHEN. For the Dense Fog Advisory, until 2 PM EDT Wednesday. For the Small Craft Advisory, from 2 PM Wednesday to noon 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 1/4 to 1/2 NM. For the Small Craft Advisory, south winds 15 to 20 kt with gusts up to 25 kt and seas 4 to 6 feet expected. * WHERE. Sandy Hook NJ to Fire Island Inlet NY out 20 nm. * WHEN. For the Dense Fog Advisory, until 2 PM EDT Wednesday. For the Small Craft Advisory, from 2 PM Wednesday to noon EDT Thursday. * IMPACTS. Conditions will be hazardous to small craft. Low visibility will make navigation difficult.

* WHAT. Dangerously hot conditions with heat index values up to 108. * WHERE. In New Jersey, Hunterdon County. In Pennsylvania, Berks, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values up to 110. * WHERE. Portions of northern Delaware, central, northern, and southern New Jersey, and southeast Pennsylvania. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 105. * WHERE. In New Jersey, Morris, Sussex, and Warren Counties. In Pennsylvania, Lehigh and Northampton Counties. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 101. * WHERE. Carbon and Monroe Counties. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.