This study examines the climatology of hurricane force extratropical cyclones over the North Pacific and North Atlantic Oceans. The periods of the study were October 2001 through April 2003. All of the extreme storms occurred in the months of October through April. Maximum frequency occurred in the North Pacific in November and December and in January for the North Atlantic. A minimum of occurrence was observed in the Pacific in the months of January.
Over the two years of this study, eighty-two cyclones were observed to reach hurricane force strength. Forty-five were observed in the Atlantic and thirty-seven in the Pacific. Geographic frequency plots reveal preferred tracks in both oceans. Maximum activity was observed over the western portions of each basin. The Pacific showed a minimum of activity between 175W and 165W degrees longitude. A minimum was observed near the European continent in the Atlantic. Storms maintained hurricane force intensity for an average of 18 to 20 hours.
The hurricane force winds were plotted in relation to each cyclone center. A composite of these plots was constructed. Hurricane force winds were most frequently observed in the south and southwest quadrants of the low center. The Atlantic storms showed a separate maximum to the north and northwest of the center. Many of these were orographically induced high winds along the Greenland Coast.
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