Moderate

* WHAT...High wave action, strong currents, and dangerous swimming conditions expected. Piers may be heavily swamped by waves. * WHERE...Mason, Oceana, Muskegon, Ottawa, Allegan and Van Buren counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Strong currents can pull swimmers into deeper water and high waves can sweep people off piers. Remain out of the water to avoid hazardous swimming conditions and do not venture out on piers. Please check with your local authorities on potential beach closures.

Areas of fog, some potentially dense and reducing visibility to as low as one quarter mile, may be quickly encountered this morning while traveling. The fog may persist through daybreak. The reduced visibility could make driving conditions hazardous. If traveling, reduce speed, use low beam headlights, and allow plenty of distance ahead of you.

If traveling this morning, be prepared for fog that could reduce visibilities to 1/2 mile or less. Slow down and allow extra time to reach your destination.

WHAT...Areas of fog with visibilities around or under a mile. WHERE...Portions of northern and north central Iowa. WHEN...Now through sunrise. IMPACTS...Drivers should be alert for reduced visibility at times. PREPAREDNESS AND PRECAUTIONARY ACTIONS...If driving this morning, please use low beam headlights.

* WHAT...Dangerous rip currents expected. * WHERE...Georgia Beaches, Beaufort, and Coastal Jasper. * WHEN...Through this evening. * 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...For the High Rip Current Risk, dangerous rip currents expected. For the Coastal Flood Advisory, up to one half foot of inundation above ground level expected along shorelines and tidal waterways (7.2 to 7.4 feet Mean Lower Low Water at Charleston). * WHERE...Coastal Colleton and Charleston Counties. * WHEN...For the High Rip Current Risk, through this evening. For the Coastal Flood Advisory, from 6 PM to 10 PM EDT this evening. * IMPACTS...This could result in some roads becoming impassable.

If traveling this morning, be prepared for fog that could reduce visibilities to 1/2 mile or less. Slow down and allow extra time to reach your destination.

* WHAT...High temperatures up to 102 and morning lows up to 75 expected. Widespread Moderate HeatRisk will be present with areas of Major HeatRisk in the foothills where the thermal belt is strongest and in urban areas. * WHERE...The San Joaquin Valley, Sierra Nevada Foothills, and West Side Hills along the Coastal Range. * WHEN...From 10 AM this morning to 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses, especially those without effective cooling and/or adequate hydration.

* WHAT...Hot conditions with temperatures 10 to 20 degrees above normal during the day, with overnight lows also running 10 to 20 degrees above normal. * WHERE...Bay Area and Central Coast. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries. Hot conditions can cause heat illnesses.

* WHAT...High temperatures in the 90s below 5500 feet expected. * WHERE...Riverside County Mountains and San Diego County Mountains below 5500 feet. * WHEN...Until 8 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Moderate HeatRisk. Warm overnight temperatures will limit relief from the heat. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.