WAVE HEIGHT, (ft) 
100 
EXCEEDANCE PROBABILITY, ( pct.) 
0.1 
—— SSMO (1963-73) 
—-— SAVILLE (1953) 
-+—+ COLE and HILFIKER (1970) 
0.01 
Figure 19, Wave height exceedance probabilities 
(9-month ice-free period). 
this may be partly due to the fact that ships tend to avoid storms. This may 
also be less true for the higher windspeeds; hence, the frequency of occurrence 
of high waves may tend to be overestimated. The disagreement between Saville!'s 
and Cole and Hilfiker's hindcast data probably results because Saville's data 
are based on coastal winds which are generally weaker than those on the deep- 
water lake surface. Figure 20 summarizes the probability of occurrence of 
various wave heights as a function of the month of the year. 
100 
1.64 ft OR HIGHER 
3.28 ft OR HIGHER 
4.92 ft OR HIGHER - 
PROBABILITY (Pct) 
cé,) 
oO 
c JAN FEB MAF APR MAY JUNE JULY AUG SEPT OCT NOV DEC JAN 
Figure 20. Variations of probability of various 
wave heights with months of the year. 
42 
