Expected

Patchy dense fog has developed early this morning across portions of eastern Iowa, mainly north of Highway 30, reducing visibility to a quarter mile. The patchy dense fog will continue for the next couple of hours before improving by 8 AM. If traveling early this morning, be prepared for rapid changes in visibility over short distances. When encountering dense fog, slow down and use low-beam headlights.

At 512 AM CDT, Doppler radar was tracking a strong thunderstorm over Winger, or 42 miles south of Thief River Falls, moving northeast at 30 mph. HAZARD...Penny size hail. SOURCE...Radar indicated. IMPACT...Minor hail damage to vegetation is possible. Locations impacted include... Fosston, McIntosh, Erskine, Gonvick, Winger, Bejou, and Gully. If outdoors, consider seeking shelter inside a building.

* WHAT...Southwest winds 25 to 35 mph with gusts up to 45 mph expected. * WHERE...Arco/Mud Lake Desert and Upper Snake River Plain. * WHEN...From 10 AM this morning to 9 PM MDT this evening. * IMPACTS...Gusty winds could make driving difficult, especially for high profile vehicles. Unsecured objects may be blown around. Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.

* WHAT...Southwest winds 20 to 25 mph with gusts up to 35 mph expected for American Falls Reservoir. * WHERE...Lower Snake River Plain. * WHEN...From 10 AM this morning to 9 PM MDT this evening. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Boaters on area lakes should use extra caution since strong winds and rough waves can overturn small craft.

* WHAT...Heat index values up to 108 expected. * WHERE...Portions of East Arkansas, North Mississippi, Southeast Missouri, and West Tennessee. * WHEN...From 11 AM this morning 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.

* WHAT...Heat index values up to 100 to 105 expected. * WHERE...Portions of southeast Kansas and central, east central, south central, southwest, and west central Missouri. * WHEN...From noon today to 7 AM 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.

* WHAT...Dangerous rip currents and breaking waves due to elevated surf of 3 to 6 feet with local sets to 7 feet on south facing beaches. * WHERE...Catalina and Santa Barbara Islands, Malibu Coast and Los Angeles County Beaches. * WHEN...From 8 AM PDT this morning through Thursday evening. * IMPACTS...There is an increased risk of ocean drowning. Rip currents can pull swimmers and surfers out to sea. Waves can wash people off beaches and rocks, and capsize small boats nearshore.

* WHAT...Dangerous rip currents and breaking waves due to elevated surf of 3 to 6 feet with local sets to 7 feet on south facing beaches. * WHERE...Ventura County Beaches. * WHEN...From 8 AM PDT this morning through Thursday evening. * IMPACTS...There is an increased risk of ocean drowning. Rip currents can pull swimmers and surfers out to sea. Waves can wash people off beaches and rocks, and capsize small boats nearshore. Remain out of the water due to hazardous swimming conditions, or

* WHAT...South swell from 190 degrees with a period of 18 to 20 seconds will generate surf of 4 to 7 feet with sets up to 8 feet along south-facing beaches. High rip current risk. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...From late Monday night through Thursday afternoon. * IMPACTS...Hazardous swimming conditions and a high rip current risk. If you become caught in a rip current, yell for help. Remain calm and do not exhaust yourself and stay afloat while

At 403 AM CDT, Doppler radar was tracking a strong thunderstorm near Mounds, or 10 miles northwest of Cairo, moving east at 20 mph. HAZARD...Wind gusts up to 40 mph and pea 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... Mounds, Tamms, Mound City, Karnak, Horseshoe Lake Conservation Area, Olive Branch, Ullin, Olmsted, New Grand Chain, and Pulaski.