times were recorded, as necessary; and (e) new charts were installed when 

 needed. 



Meteorological Data Analysis 



Air temperature 



37. Mean air temperature was computed four times per day from 20-min 

 digital data samples. From these data, monthly and annual means were 

 determined . 



38. Monthly and annual mean and extreme highest and lowest daily tem- 

 peratures were determined from the daily maximum and minimum thermometer 

 values. 



Atmospheric pressure 



39. Mean atmospheric pressure was computed four times per day from 

 20-min digital data samples. From these data, monthly and annual means were 

 determined. 



Wind data 



40. Mean wind speed and direction were computed four times per day from 

 20-min digital data samples. 



41. Annual, seasonal, and monthly joint probability distributions of 

 wind speed versus direction were computed. Wind speeds were resolved into 

 1-m/sec intervals while the directions were at 22.5-deg intervals; i.e., 

 l6-point-compass-direction specifications. These distributions are presented 

 as wind "roses," such that the length of the petal represents the frequency of 

 occurrence of wind blowing from the specified direction and the width of the 

 petal is indicative of the speed in 3-ni/sec intervals. Resultant directions 

 and speeds were also determined by vector-averaging the data. 



Wave Data 



42. Thompson (1977) and Harris (1974) describe the procedure used for 

 analyzing and summarizing the digital wave data contained in this report. The 

 procedure is based on a Fast Fourier Transform (FFT) spectral analysis of 

 4,096 data values (1,024-sec recordings, sampled at 4 Hz) for each file 

 processed. 



43. The program computes the first five moments of the distribution of 



22 



