If however, a previous days' charge had risen to higher altitudes due to higher temperatures, this charge would remain in the upper atmosphere. This effect could alter the duration of charge buildup by effectively putting the charge build-up on hold. If the fog extends from ground level to higher altitudes, the atmospheric electrical potential equalizes. If the fog floor in not at ground level, charges generated on the ground ascend into the atmosphere, and into the fog. No hypothesis as to the results of this condition will be proposed.
Wind is the last fuzzy element.
All Type II EQs occur in calm weather. When the wind blows, the charges disperse. Conversely when the wind stops the charges gather. Palm Springs, because it's situated behind the pass, appears to be a location where residual charge remains because of wind driven eddy currents. In the Bay Area, northerly winds generally end up near Hollister or San Juan Bautista where the valley ends.