Moderate

* WHAT...Visibility to one quarter of a mile or less in dense fog. * WHERE...In Kansas, Cheyenne KS, Decatur, Norton, and Rawlins Counties. In Nebraska, Dundy, Hitchcock, and Red Willow Counties. * WHEN...Until 10 AM CDT /9 AM MDT/ this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Patchy fog will affect portions of North Central Montana this morning. Visibility will be locally reduced to less than one half mile at times. Those travelling this morning should be prpared for rapid changes in visibility over short distances and reduce driving speeds in areas of poor visibility.

The combination of hot temperatures and elevated humidity levels will produce heat index values between 108 and 111 degrees for several hours this afternoon into this evening. A few locations may briefly experience heat index values above 111 degrees. If you plan to spend time outside, drink plenty of water, wear light weight and light colored clothing and take frequent breaks from the heat. Young children and pets should never be left unattended in vehicles.

Localized dense fog has developed along the northern and central Virginia Blue Ridge Mountains. This affects Interstate 64 at Afton Mountain, and Highway 211 at Thornton Gap. Motorists should use extra caution when driving this morning. Reduce speed, leave extra travel time and following distance, and use low beam headlights.

Localized dense fog has developed along the higher terrain this morning. This affects Interstate 68 at Big Savage Mountain and Keyser's Ridge. Motorists should use extra caution when driving this morning. Reduce speed, leave extra travel time and following distance, and use low beam headlights.

At 604 AM CDT, Doppler radar was tracking a strong thunderstorm near Booneville, moving northeast at 20 mph. HAZARD...Winds in excess of 40 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Booneville... Magazine... Blue Mountain... Stonehouse Recreation Area... Mount Magazine... Sugar Grove...

At 613 AM CDT, Doppler radar was tracking a line of strong thunderstorms extending from 18 miles northwest of Idabel to 5 miles northwest of Manchester, or extending from 35 miles north of Clarksville to 21 miles north of Clarksville, moving southeast at 10 mph. HAZARD...Wind gusts up to 30 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include...

* WHAT...West winds 10 to 20 mph with gusts up to 35 mph. * WHERE...West Side Mountains north of 198, including San Luis Reservoir. * WHEN...Until 5 AM PDT Tuesday. * IMPACTS...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...Areas of dense fog producing visibility one quarter mile or less. * WHERE...Portions of central, south central, and southeast Montana and north central Wyoming. * WHEN...Until 10 AM MDT this morning. * IMPACTS...Morning travelers can expect to encounter areas of very poor visibility. This includes portions of Interstate 90 from Big Timber to Billings, Hardin and Sheridan. Portions of Interstate 94, US-191, and US-212 will also be impacted. Please use caution and allow extra time for your morning commute.

At 541 AM CDT, Doppler radar was tracking a strong thunderstorm 8 miles southeast of Echo, or 8 miles southwest of Booneville, moving northeast at 35 mph. HAZARD...Winds in excess of 40 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Booneville... Magazine... Sugar Grove... Carolan...