found in simulating large storms on PATHl. 



A maximum surge of 8.52 m occurring at the same location as in 

 the HUR22 run was generated by HUR23. The time sequence of water 

 levels at Cedar Key is shown in Fig. 84. Due to a fast speed and a 

 relatively short distance across the Gulf, the maximum surge at Cedar 

 Key occurs so early that it is not possible to identify the existence 

 of an initial rise of water levels. The 12 h mode however, remains 

 noticeable. The tiq signal (Fig. 85) reaches the first peak of 0.2 m 

 at 1400 h on day 3, which is approximately 9 h after the storm passed 

 Yucatan Strait. The highest peak of tjq is 0.23 m and the period is 

 estimated at 25 h. 



Reducing the forward speed of the storm to 15 km/h (HUR24), 

 decreases the maximum surge to 7.32 m. Figure 86 illustrates two 

 negligible water level maxima before the peak surge at Cedar Key. 

 The 12 h mode after the peak surge is again excited. The 26 h period 

 of the small amplitude t)q signal is shown in Fig. 87. It is 

 interesting but not yet understood why the first maximum of tjq 

 occurred before the storm center entered the Gulf . The 6q determined 

 from the second maximum of jjq is approximately 20 h. 



These four runs on PATH4 repeatedly gave the same results 

 regarding the effects of forward speed and radius of maiximum wind. 

 The notable result is the excitation of the 12 h mode on the Florida 

 shelf. It is important to emphasize that this model admitted no 

 tidal forcing. Reid and Whi taker (1981) found a near resonant 

 response on the Florida shelf, with the greatest signal near Cedar 

 Key, to direct forcing by the M2 tide potential. Figure 88 (Ichiye 



143 



