Moderate

* WHAT...Heat index values up to 110 degrees expected. * WHERE...Portions of central Mississippi, southeast Arkansas, and northeast Louisiana. * WHEN...For the first Heat Advisory, until 7 PM CDT this evening. For the second Heat Advisory, from 11 AM to 7 PM CDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat related illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

* WHAT...Heat index values up to 108 expected. * WHERE...A portion of Middle Tennessee. * WHEN...Until 8 PM CDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat

* WHAT...Dangerous rip currents expected. * WHERE...Franklin County Beaches. * WHEN...Through late Thursday night. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.

* WHAT...Strong north to south longshore current. There is also a Moderate Risk of rip currents. * WHERE...In North Carolina, Coastal Pender and Coastal New Hanover Counties. In South Carolina, Coastal Horry and Coastal Georgetown Counties. * WHEN...Today. * IMPACTS...Longshore currents can sweep swimmers and surfers into rip currents, piers, jetties, and other hazardous areas. It may sweep swimmers off their feet, making it difficult to return to shore.

* WHAT...Dangerous swimming conditions from high waves and rip currents expected. Waves as high as 4 to 8 feet possible. * WHERE...Presque Isle, Alpena, Alcona, Iosco and Arenac Counties. * WHEN...Until 9 PM EDT this evening. * IMPACTS...A high swim risk means that life-threatening waves and currents are expected. Stay out of the water and stay away from dangerous areas like piers and breakwalls. Remain out of the water to avoid hazardous swimming conditions.

* WHAT...Dangerous swimming conditions from high waves and rip currents expected. Waves as high as 4 to 10 feet possible. * WHERE...Southeast Chippewa, Western Mackinac and Eastern Mackinac Counties. * WHEN...Until 9 PM EDT this evening. * IMPACTS...A high swim risk means that life-threatening waves and currents are expected. Stay out of the water and stay away from dangerous areas like piers and breakwalls. Remain out of the water to avoid hazardous swimming conditions.

* WHAT...Dangerous swimming conditions from high waves and rip currents expected. Waves as high as 4 to 8 feet possible. * WHERE...Emmet, Leelanau, Benzie, Manistee and Charlevoix Counties, and Beaver Island and surrounding islands. * WHEN...Until 9 PM EDT this evening. * IMPACTS...A high swim risk means that life-threatening waves and currents are expected. Stay out of the water and stay away from dangerous areas like piers and breakwalls. Remain out of the water to avoid hazardous swimming conditions.

* WHAT...West winds 10 to 15 mph with gusts up 30 mph. * WHERE...San Luis Reservoir. * WHEN...From 5 PM this afternoon to midnight PDT tonight. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Annette Island, Ketchikan Gateway Borough, and Prince of Wales Island. * WHEN...Until 10 AM AKDT this morning. * IMPACTS...Low visibility could make travel conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...City and Borough of Wrangell and Petersburg Borough. * WHEN...Until 10 AM AKDT this morning. * IMPACTS...Low visibility could make travel conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.