threshold of 0.9 m/sec. Wind direction accuracy is ±2 deg with a resolution 

 of less than 1 deg. The anemometer 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 



