225 



E 150 : 

 E 



a 

 £ 100 



Year Total, mm 



x M987 908 



e- — ©1978-87 971 



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 

 which create low to moderate, warm southern breezes; arctic and polar air 

 masses which 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 

 dominate wind direction changes with 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 on top of the laboratory building at an ele- 

 vation of 19.1 m (Figure 2) using a Weather Measure Corporation (Sacramento, 

 CA) Skyvane Model W102P anemometer. Wind speed and direction data were 



13 



