Dense Fog Advisory issued December 25 at 11:49AM CST until December 25 at 8:00PM CST by NWS Sioux Falls SD

* WHAT…Visibility one quarter to one half mile in dense fog.

* WHERE…Portions of northwest Iowa and southeast South Dakota.

* WHEN…Until 8 PM CST this evening.

* IMPACTS…Low visibility could make driving conditions hazardous.