In most cases a modified marine air mass will follow in the wake of the thermal trough. Gusty winds and thunderstorms can be associated with the passage of a thermal trough. The trends delineated in the daily planning forecast narrative are area wide averages for the extreme part of the day. Twenty foot winds. The air movement measured 20 feet above the ground or the average height of the vegetative Cover and averaged over at least a 10 minute period.
Unstable conditions are favorable for turbulent surface winds and erratic fire behavior.
Smoke generally disperses well in an unstable situation. An appreciable amount of continuous rainfall over a broad area. National Weather Service 1945 Beechcraft Ave.