Moderate

* WHAT...This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. * WHERE...Portions of Puerto Rico and Virgin Islands. * WHEN...Until 5 PM AST this afternoon. * 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

Patchy fog will reduce visibility to one quarter mile or less in parts of northwest and north central North Dakota early this morning. Motorists should be prepared for rapidly changing conditions and use extra caution traveling. Use low beam headlights and be extra cautious at intersections and railroad crossings. The fog is expected to dissipate by 9 AM CDT.

* WHAT...Heat index values up to 108 to 112 expected. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...From 11 AM this morning to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Isolated showers and thunderstorms during the afternoon hours could provide relief in some areas. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

* WHAT...Dangerously hot conditions with heat index values in excess of 110 degrees and peaking around 115 degrees. * WHERE...Portions of west, central, north and south Mississippi, southeast Arkansas, and northeast Louisiana. * WHEN...From 11 AM this morning to 8 PM CDT this evening. * IMPACTS...High temperatures and high humidity may cause heat related illnesses. * ADDITIONAL DETAILS...Temperatures at night will not bring much relief as they struggle to fall below 80 in some cases. The threat

* WHAT...Temperatures as high as 107 degrees. * WHERE...Eastern portions of the Texas and Oklahoma Panhandles and Palo Duro Canyon. * WHEN...From noon today to 9 PM CDT this evening. * 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. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning

* WHAT...Visibility down to a quarter mile or less in dense fog. * WHERE...Western Kupreanof Island and Kuiu Island. * WHEN...Until 9 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...Heat index values up to around 109. * WHERE...Portions of central, eastern, north central, southeast, southwest, and western Arkansas. * WHEN...Until 8 PM CDT this evening. * 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.

* WHAT...Heat index values up to 105 expected. * WHERE...Portions of southeast Kansas and southwest and west central Missouri. * WHEN...From 1 PM this afternoon to 8 PM CDT this evening. * 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.

Areas of dense fog have developed this morning across much of the Midcoast. Visibility may drop to a half mile or less at times. Motorists are urged to use caution during the morning commute. The fog should start to lift after 8 or 9 AM.

At 444 AM CDT, Doppler radar was tracking a strong thunderstorm 8 miles east of Oconto, or 16 miles south of Broken Bow, moving east at 25 mph. HAZARD...Wind gusts up to 50 mph and penny size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Mason City, Buckeye, Block Hill Basin, Burr Oak, Gavin Siding, Intersection of Highway 183 and Cumro Road, and Cumro.