Year Total, mm 
x—x 1991 1013 
@----© 1978-91 1025 
Precipitation, mm 
: ° 
ce eee cee 
JAN FEB MAR APR 
MAY JUN JUL AUG SEP OCT NOV DEC 
Month 
Figure 5. Daily precipitation values with monthly totals 
Wind Speed and Direction 
24. Winds at the FRF are dominated by tropical maritime air masses that 
create low to moderate, warm southern breezes; arctic and polar air masses 
that produce cold winds from northerly directions; and smaller scale cyclonic, 
low pressure systems, which originate either in the tropics (and move north 
along the coast) or on land (and move eastward offshore). The dominant wind 
direction changes with the season, being generally from northern directions in 
the fall and winter and from southern directions in the spring and summer. It 
is common for fall and winter storms (northeasters) to produce winds with 
average speeds in excess of 15 m/sec. 
Measurement instrument 
25. Winds were measured at the seaward end of the pier at an elevation 
of 19.1 m (Figure 2) using a Weather Measure Corporation (Sacramento, CA) 
Skyvane Model W102P anemometer. Wind speed and direction data were collected 
on the FRF computer. The anemometer manufacturer specifies an accuracy of 
+0.45 m/sec below 13 m/sec and 3 percent at speeds above 13 m/sec, with a 
14 
