Humidity rising faster than temperature - Dense fog tonight in Thumb, Tri-Cities and SE Michigan

With nearly 100% humidity levels and temperatures not yet rising to exceed the dewpoints, a thick layer of fog has developed across most of southeast lower Michigan.  To that end, NWS Detroit/Pontiac has issued a Dense Fog Advisory, in effect until 9AM tomorrow:

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1113 PM EDT SUN AUG 30 2015


MIZ047>049-053>055-060>063-311300-
/O.NEW.KDTX.FG.Y.0003.150831T0313Z-150831T1300Z/
MIDLAND-BAY-HURON-SAGINAW-TUSCOLA-SANILAC-SHIAWASSEE-GENESEE-
LAPEER-ST. CLAIR-
INCLUDING THE CITIES OF...MIDLAND...BAY CITY...BAD AXE...
SAGINAW...CARO...SANDUSKY...OWOSSO...FLINT...LAPEER...PORT HURON
1113 PM EDT SUN AUG 30 2015

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EDT MONDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A
DENSE FOG ADVISORY...WHICH IS IN EFFECT UNTIL 9 AM EDT MONDAY.

HAZARDOUS WEATHER...

 * VISIBILITY HAS FALLEN TO 1/4 MILE OR LESS ACROSS MUCH OF THE
   AREA.

 * DENSE FOG WILL CONTINUE TO DEVELOP INTO EARLY MONDAY MORNING.


IMPACTS...

 * MOTORISTS WILL EXPERIENCE DECREASED VISIBILITY.

 * THE MORNING COMMUTE MAY BE ADVERSELY AFFECTED.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

 * A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.

The last super foggy night I drove through was back in April, and I had to go all the way to Midland from Pigeon.  I sympathize with anyone who has to deal with this on the road tonight, and advise patience.