collected on the FRF computer as well as on a strip-chart recorder. 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 threshold of 0.9 m/sec. Wind 

 direction accuracy is +2 deg with a resolution of less than 1 deg. The ane- 

 mometer is calibrated annually at the National Bureau of Standards in 

 Gaithersburg, MD, and is within the manufacturer's specifications. 

 Results 



26. Annual and monthly joint probability distributions of wind speed 

 versus direction were computed. Winds speeds were resolved into 3 -m/sec 

 intervals, whereas the directions were at 22. 5 -deg intervals (i.e. 16 -point 

 compass direction specifications) . These distributions are presented as wind 

 "roses," such that the length of the petal represents the frequency of occur- 

 rence of wind blowing from the specified direction, and the width of the petal 

 is indicative of the speed. Resultant directions and speeds were also deter- 

 mined by vector averaging the data (see Table 2). Wind statistics are pre- 

 sented in Figures 6, 7, and 8. 



14 



