What causes Tuly Fog?

Answer 1

Tule fog is caused by radiational cooling.

A few days after a good rain you get clear skies that allows the temperature to cool at night. When it cools to the dew point, if the wind is light or calm, you get fog. This kind of fog can last for days.

Answer 2

This type of fog can be found in the Sacramento Valley and San Joaquin Valley and the Delta regions of California and is named after a plant that grows along the wet lands regions of the river basins and delta region. This type of fog usually starts out as a shallow layer with the height of the layer about the height of this plant. It forms during the cold season mostly on a clear and nearly calm night and can quickly beome very dense.

What is the Cause? Heat rapidly escapes into the atmosphere during the evening and continue through the night. This cooling process (radiational cooling) results in temperatures falling rapidly at the surface. The air cools until the humidity reaches 100%, a thick ground fog forms, usually becoming very dense by sunrise.

What weather conditions to look for best chances for this type of fog to form:

High pressure aloft with sinking air through the mid levels of the atmosphere
light or near calm winds expected for the low elevation area
Weak boundary layer winds
Skies clear or with only thin high clouds
Soil is moist from a recent precipitation event will definitely help
Temperature expected cool down to the dew point temperatures
(RH expected to reach 100 percent)
air mass is stable
strong low level near surface inversion will help
No or very weak downslope or drainage winds for locations near the foothills

The more you can check off from the list above, the more likely this type of fog will form in the valley and delta regions of Northern and Central California.

Answer 3

It's actually TULLE which is the name of plants that grow in bogs or wetlands. Pronounced "tully" If you ever lived in the big central valley of California, or have ever driven through it at certain times of the year you know what it is.
It occurs when you have a cool night followed by a warm morning in an area with shallow wetlands. As the sun warms the damp earth it "steams" and a fog forms. As the sun gets high the moisture becomes warmer and expands, causing it to widen and rise. Our sun acts like the burner on a stove, causing any water, fresh or salt, to stir and then expand. Watch a pot of water simmer on your stove.
With tulle (think bulrushs) fog the fog bank expands and can cover the highways, causing lots of fender benders among the careless. Or it will just spread out over the land and dissipate like fog on the ocean. California is working to re-establish it's wetlands and the areas along the state highways I-5 & 99 have lots of ducks, egrets, even seagulls. Their marshy lands create tulle fog that is very dangerous to drivers who use the highways. But the good out weighs the bad in that the birds gobble down billions of insects, lessening the need for chemical poisons in the veggie fields. That same area of California has terrible dust storms and has experienced 100 car/truck pile-ups because a sudden dense dust cloud can cover the highway in minutes.
It all comes down to driving like you had a brain when you are in areas where nature can throw you a curve.

Answer 4

another question, What the hell is Tuly Fog.???

Answer 5

Tule fog (so named because it sometimes hangs just above the tules) is formed when moisture leaves the relatively warm soil and vegetation, and encounters relatively cool air above. I have seen it where it just extends a few feet above the ground, and where it hangs just above the tules.

Answer 6

, What the hell is Tuly Fog.?????????????????????????????????????????????????????????????????????????????????