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Guam, the southernmost island of the Mariana Islands, is likely to encounter a significant typhoon every seven years. During the last thirty years two typhoons have passed directly over Guam—Karen (11 November 1962) and Pamela (21 May 1976). Pamela had maximum winds of 120 kt (145 estimated), minimum sea level pressure of 930 mb, a speed of movement at 7 kt, a diameter of 20 nautical miles, and 33 inches of rainfall during the typhoon passage.