Visibility Going Down

With a southerly wind this morning moisture continues to stream up through Illinois as dew points have been rising the past couple of hours.  This has allowed a little more fog to develop across the region and drop visibility down to around a quarter mile in some locations.  Now with temperatures sitting below freezing, freezing fog could be a possibility as there are already a few observation sites that are reporting that.  The fog will likely continue through the day until our wind switches from the south to the northwest behind a cold front that won't come through until later this evening.