Fog Bow

Shallow, but thick fog across southeast Minnesota early this morning resulted in what is known as a "fog bow".

A fog bow is similar to a rainbow, developing as a result of refractions in suspended water droplets. However, the fog droplets are much smaller than those of rainbow inducing raindrops - smaller than 0.05 millimeters (0.0020 in). This results in very weak colors, with a red outer edge and bluish inner edge. If small enough (like in this picture), fog bows appear white, and are therefore sometimes called "white rainbows".

fog bow across southeast Minnesota


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.