A fogbow is formed by much smaller droplets of water than a rainbow. These droplets are too small to reflect and refract sunlight, so instead diffraction of light is dominant. Since a fogbow is broader than a rainbow, the colors overlap to produce a whitish bow. Link to Earth Science Picture of the Day fogbow archive (awesome site, highly recommended) | more fogbow pics |
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According to legend, you'll find a PT Cruiser at the end of a fogbow.
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In parts of Canada, we get ice-fogs (freezing fog) and yes, ice-fog rainbows. They are spectacular. I wish I had a pic to post a link to...
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