A southerly flow of unseasonably warm, moist air (temperatures of +20° to +26° C,
dew points of +14° to +16° C) over the relatively cool (generally +2° to +5° C )
water of Lake Michigan and Lake Huron contributed to the development of large
advection fog plumes (caused by the horizontal motion of air) during the day on April 16, 2002. These fog plumes moved
northward during the day, eventually interacting with various land features to
produce patterns of wave diffraction and packets of reflected waves (resembling
#8220;shock waves”) as the fog plumes impinged upon the rugged coastline
of Wisconsin, the Upper Peninsula of Michigan, and Ontario. These waves remained
trapped within the strong marine layer temperature inversion which was sustained
by the continued flow of warm air across the cool water surface.
Acquired February 21, 2010, these true- and false-color images of British Columbia show fog filling mountain valleys northeast of Vancouver. In the false-color image, vegetation appears bright green, snow appears bright turquoise, and fog appears as a very pale, muted blue-green.