DETROIT (WWJ) - Fog covering southeast Michigan Friday morning is so dense, some people are saying it's the worst they've ever seen. The National Weather Service has issued a Dense Fog Advisory ...

A mysterious purple cloud descended over a Chilean town Sunday. Twitter/ @JeannetteQuim Residents of Pozo Almonte, Chile, awoke to an ominous purple cloud hanging low over their city Sunday morning.

AIR STAGNATION ADIVSORY is in effect until 5 AM Friday for the Kootenai/Cabinet Region, Lower Clark Fork Region, Missoula/Bitterroot Valleys, and Patomac/Seeley Lake Region.

ABC7’s forecast is that “the weather is going to be phenomenal” most of Thursday, but that San Francisco will see fog start to pile up right around fireworks time at 9:30 p.m. Thursday evening.

Clouds with areas of fog overnight. Increasing sunshine and warmer Thursday.

A Dense Fog Advisory is in effect until 6 p.m. for the entire area, ... Highs will climb back to near 40, with clouds sticking around through the weekend and patchy fog into Saturday morning.

ASHLEY D.: I WANT TO KNOW IF IT STILL FITS. WE ARE DEALING WITH DENSE FOG. IT IS STARTING TO DROP IN PORTIONS OF WESTMORELAND. DOWN TO FIVE MILE VISIBILITY. EIGHT MILE HURT LESS IN BUTLER ...