Moderate

Patchy dense fog has developed early this morning across portions of eastern Iowa, reducing visibility to a quarter mile. The patchy dense fog will continue for the next couple of hours before improving between 8 AM and 9 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 540 AM CDT, Doppler radar was tracking a strong thunderstorm near Salem, or near Marion, moving east at 30 mph. HAZARD...Wind gusts up to 40 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Marion, Salem, Creswell, Farmersville, Fredonia, Dycusburg, and Fryer. If outdoors, consider seeking shelter inside a building. Torrential rainfall is also occurring with this storm and may lead to

Areas of locally dense fog are affecting portions of south-central Minnesota and north-central Iowa early this morning. Visibilities of 1/2 to 1/4 mile have already been observed. Improvement in visibilities is expected within a few hours after sunrise. If traveling early this morning, reduce your speed and use low-beam headlights when encountering foggy areas.

WHAT...Patchy fog with visibilities around or under a mile at times. WHERE...Portions of north central and northeast Iowa. WHEN...Until 8 AM Tuesday. IMPACTS...Drivers should be alert for reduced visibility at times. Improvements are expected within a few hours after sunrise. PREPAREDNESS AND PRECAUTIONARY ACTIONS...If driving this morning, please use low beam headlights.

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.