14 



these stratus layers vary from 600 to 800 feet at dawn, rise 

 to 1,200 or 1,300 feet after sunrise, and are near 1,500 feet 

 at the time of dissipation. 



Despite the increase in the number of cloudy mornings, 

 the summer months have a high percentage of clear days. If 

 the afternoon periods are considered along with the 24 hour 

 periods, it is noted that June has the least cloudiness and 

 August the most. An average of 27 afternoons are clear in 

 June and 14 all --day periods . 

 August through December 



Fog conditions begin to increase in August and this trend 

 more or less continues through the end of January. The trend 

 is most obvious in 24-hour fogs. In August and September an 

 average of 7 mornings each month have low visibility due to 

 fog, a characteristic of these months. Whereas fog in the 

 early summer months is extremely irregular in occurrence, in 

 August and September regular sequences may occur. Records 

 show many periods when fog occurs each morning for 5 to 8 

 days. However, there is only one recording of fog persisting 

 throughout the day. 



Afternoon fogs in these five months are irregular in 

 occurrence and are generally the result of a noontime "lifting" 

 of the fog to be followed by a "lowering" in the late after- 

 noon. Under such conditions, a fog bank persists throughout 

 the day 20 to 30 miles offshore and the "lifting" and "lowering' 

 is the result of morning land breezes and afternoon sea breezes, 

 During the midday break, the sky is hazy and visibility remains 

 less than 3 miles. 



