Foggy start this morning

(8:42:39 AM) nwsbot: LOT expires Dense Fog Advisory for Boone, Cook, De Kalb, DuPage, Kane, La Salle, Lake, Lee, McHenry, Ogle, Winnebago [IL]


7:30am Update: Current visibility this morning is still below one mile in many locations.  A Dense Fog Advisory continues for Green, Rock, Walworth, Winnebago, Boone, McHenry, Ogle, Lee and DeKalb counties until 9am.  Gusty northwest winds later this morning should help mix out some of the fog.  Drizzle and even light rain showers will persist through the morning before switching over to light snow late this morning and into the afternoon.  Accumulations shouldn't be much, maybe half an inch to one inch.  Give yourself extra time this morning as visibility will rapidly change while driving.

6am Update:  The Dense Fog Advisory for Stephenson, Jo Daviess, Carroll and Whiteside counties has been allowed to expire.  The advisory ran through 6am for our western counties.  Increasing winds has helped visibility improve to a mile or so across the region.  As winds pick up this morning visibility will gradually improve.

A Dense Fog Advisory continues for southern Wisconsin and northern Illinois through 9am.  Even though the advisory lasts until 9am expect the fog to continue through mid-morning.  Visibility in many locations has fallen to less than a half mile; especailly in outlying, rural locations.

Southerly winds continue to transport a warm, moist air mass over a fresh snow pack this morning.  Combine that with the rain showers overnight and locally dense fog has developed.  The fog will last through mid to late morning and then winds will shift to the west/northwest pulling in a little drier air mass.  Temperatures this morning are in the upper 30s and lower 40s but are expected to drop into the upper 20s and lower 30s by late this afternoon.  Winds could gust as high as 35-40mph later today.