Offshore Winds in California During the Dry Season*

(Santa Ana in southern California; Diablo in north-central California)

(Note: Santa Ana/Diablo Wind Pattern can occur during the Fall, Spring or Winter, but only in the late Summer and Fall does it occur when vegetation is dried out from the normal summer dry season, making fire hazard extremely high.)

I. Are "Hot" Because

Air that is warm to begin with is further warmed by compression.

II. Are "Dry" Because

Air with little water vapor to begin with is warmed furtther, thus, further lowering relative humidity.

III. Are associated with very strong surface wind speeds because

Very fast wind speeds occur downwind of major canyons and over ridges.