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Tule fog is a radiation fog, which condenses when there is a high relative humidity (typically after a heavy rain), calm winds, and rapid cooling during the night. The nights are longer in the winter months, which allows an extended period of ground cooling, and thereby a pronounced temperature inversion at a low altitude.
The fog season is usually based in the cooler months (late autumn, winter and early spring). An example is found in the San Joaquin Valley and Sacramento Valley areas of California 's Great Central Valley , where a thick ground fog, known as Tule fog , may form, in particular in the months from November through March. [ 1 ]
Tule fog forms during the late fall and winter (California's rainy season), after the first significant rainfall. The official season is from November 1 to March 31. This phenomenon is named after the valley's tule grass wetlands (tulares). Auto collisions caused by the tule fog are the leading cause of weather-related casualties in California.
To stay prepared on a foggy road, here’s what you need to know.
Another type of fog, tule fog, can occur during the winter. There are occasions when both types can coincide in the Bay Area. There are occasions when both types can coincide in the Bay Area. The prevalence of fog in the San Francisco Bay Area has decreased, and this trend is typically attributed to climate change .
Patchy fog after 1 p.m. with calm wind becoming southeast around 5 mph. Cloudy atmosphere continues through the night with a low around 29°F. Areas of freezing fog between 1 a.m. and 2 a.m. North ...
Mist in an airplane cabin often gets mistaken for smoke and can cause anxiety or panic among passengers. Here’s the science behind it and why it’s perfectly harmless.
Schoenherr's A Natural History of California has more information about the formation of tule fog. It notes (p. 42) that the tule fog is a temperature inversion layer.It is formed when cold mountain air flows downslope into the valley during the night, pooling in the low areas until it fills the valley to the "brim" formed by the Coast Ranges and the Sierra Nevada.