wave heights as indicated by the writer's hindcast data and the curves 

 presented by Saville are shown in Table 1 and plotted in Figure 7. 

 These differences are discussed below. 



a. Milwaukee, Wisconsin . At this station wave heights on 

 the full year basis for the various frequencies were lower by about 



1.5 to 2.0 feet. A storm which would produce waves greater than 15 feet 

 did not recur during the additional years of the longer period of record; 

 therefore, the assumed frequency of a 15-foot wave decreased from once 

 in 3 years to once in 5 years. Very good agreement resulted for fre- 

 quencies obtained for the ice-free period. 



b. Muskfcfcjn, Michigan . For the full year lower wave heights 

 were obtained for occurrences of more than once in 7 years and higher 

 waves for frequencies of occurrence of less than once in 7 years. 

 Apparently a smaller number of less severe storms occurred during 1951 

 and 1952. In 1951 an additional storm occurred which produced wave 

 heights of 14 feet and in November 1952 a storm occurred which produced 

 wave heights of 19 feet. The inclusion of these higher storms increased 

 the rate of occurrences of wave height throughout the curve for the ice- 

 free period. 



c. Cleveland, Ohio . For both the full year and the ice-free 

 period rarer frequencies were derived for Cleveland. During 1951 and 

 1952 storms affecting Cleveland were less severe than during 1948-1950. 



d. Buffalo, New York . For Buffalo a slightly larger number 

 of storms with higher wave heights occurred during the full year period. 

 Good agreement was obtained for the ice-free year> curve. 



The probable major reasons for variance in the rei^uli.o ot the two 

 hindcasts are considered to be that: (a) the length of the period of 

 record is different, one 3 years and the other 5 years; (b) the hind- 

 casts were made by different forecasters with probable differences in 

 interpretation of data; (c) wind data used in this paper are from a 

 single shore station for each location while in the earlier paper 

 synoptic weather charts were used as a basis. The amount of variance 

 is considered relatively small and indicates the validity of using for 

 the Great Lakes area this shorter method of single station wind data 

 applied over a shore-to-shore straight line fetch in the direction of 

 the station wind. 



BIBLIOGRAPHY 



1. Sverdrup, H. J. and W. H. Munk; Wind, Sea and Swell: Theor/ of Re- 



lations for Forecasting, H. 0. Publication 601, 1947. 



2. Arthur, R. S.; Revised Wave Forecasting Graphs jUd Procedures, 



Scripps Institute of Oceanography Wave Report 73, 1947 (Unpub.) 



