Since when does fog come rolling in at 7 p.m. in 93-degree heat? A fog bank, or what appeared to be fog, rolled over the Colorado River just below the bridge on Broadway last Sunday evening. How did it get there?

If you live in the area near Monument Road or Power Road, or if you were traveling that way around 7 p.m. on Sunday night, you were probably a little shocked to see this weird anomaly.

At a glance, it was clear the "fog" was not the result of a fire. The cloud was pure white and did not rise into the air. To be honest, it looked exactly like fog.

According to, fog occurs when:

  • condensed water droplets which are the result of the air being cooled to the point (actually, the dewpoint) where it can no longer hold all of the water vapor it contains.


  • a warm moist air mass blowing over a cold surface (usually snow or ice, or over a cold ocean surface) can also cause fog to form, this is called "advection fog."

Whereas last night was concerned, neither of these examples explain what was actually happening.

In this case, the fog was the result of kids setting off explosives just north of the Redlands end of the bridge. Sorry, but that's it. Not the fascinating explanation you were hoping for.