(1) The foggiest observing location in the lower-48 states is found at?
Cape Disappointment in Washington State
The North Head lighthouse, north of the western terminus of the Columbia River experiences, on average, 106 days with heavy fog. (Heavy fog is defined as fog causing visibility to drop below 1/4 mile).
The location of Cape Disappointment
North Head Lighthouse
Here is a map showing the average number of days with heavy fog each year across the U.S.. Oregon and Washington are not second rate in heavy fog. Yes, New England and the Appalachians do well on an annual basis, but we in the Northwest have fog more consistently, month to month, then they do! Tucson is a bad place if you enjoy fog.
(2) Mosquitoes don't like to fly in fog. Turns out that that constant impact of little droplets is disconcerting to those buzzing pests (see below). In fact, fog is more unpleasant for them than rain! Another reason why the Northwest rarely has a major mosquito problem.
(3) Fog can create islands in the sky! Don't believe me? Check these pictures from Bellevue's Summit neighborhood Thursday morning. Looks like the San Juan Islands.
Picture Courtesy of Peter Benda
(4) Fog can flow like water! Check out this video for the proof!
(5) The most difficult thing to believe? The fog period will be over on Sunday as an upper trough comes through. Here is the upper level (500 hPa) chart for Sunday at 11 AM. Strong trough! And we are then on the eastern side of the ridge with lots of flow over us (that is indicated by large number of height lines close together).