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The 1958 Atlantic hurricane season included every tropical cyclone either affecting or threatening land. There were ten named storms as well as one pre-season tropical depression. Seven of the storms became hurricanes, including five that were major hurricanes, or the equivalent of a Category 3 on the Saffir-Simpson scale. The strongest storm, as measured by maximum sustained winds, was Hurricane Cleo, which became a Category 5 hurricane in August but remained away from land. Hurricane Helene had a lower barometric pressure of while just offshore the southeastern United States. In May, a subtropical depression formed in the Caribbean and dropped heavy rainfall near Miami, Florida. The first named storm of the season was Alma, which killed three people and caused flooding in Texas. Hurricane Daisy in August was a major hurricane that paralleled the eastern coast of the United States, although due to its small size it did not cause much damage. Hurricane Ella affected much of the northern Caribbean and Texas, most significantly the Dominican Republic where 30 people died. Ella also killed six people in Cuba, where it made landfall as a major hurricane. A few weeks later, Tropical Storm Gerda also struck the Dominican Republic and killed three people. The costliest storm of the season was Helene, which caused $11.2 million in damage (1958 USD), mostly in North Carolina. Although it passed within of the state, its effects were mostly limited to the coast, and the hurricane killed one person. The last storm of the season, Janice, killed eight people in Jamaica when its precursor dropped of rainfall, and one person was killed in the Bahamas. ==Season summary== The ten tropical storms during the season is comparable to the 20 year average of ten. In contrast to the previous season when most storms were in the Gulf of Mexico, most storms in 1958 occurred over the western Atlantic Ocean. The first storm, Alma, formed in the middle of June. Subsequently, a trough persisted along the eastern United States, which suppressed tropical cyclone formation. Conditions remained unfavorable in July due to a large ridge suppressing the westerlies. In August, a persistent trough caused three storms – Becky, Cleo, and Daisy – to recurve and remain over the ocean. Most storms formed from the middle of August through the middle of October, when polar air reached as far south as Florida due to a shift in the ridge.〔 Before the season started, the United States Weather Bureau office in Miami began setting up a teleprinter to distribute hourly advisories to newspapers and the American Red Cross. The hurricane season officially began on June 15, and lasted until November 15. When the season started, the Lakeland Frost Warning Service sent four employees to assist the Miami Weather Bureau. The Hurricane Hunters flew daily to investigate potential storms in the Atlantic Ocean and Gulf of Mexico. In addition, there was a set of radars from Texas to Maine to track storms. Beginning in 1958, the Weather Bureau predicted the change in tide due to a storm with the assistance of a tide specialist. During the season, a reporter – daughter of Weather Bureau director Gordon Dunn – flew into Hurricane Daisy, becoming the first woman to fly into a hurricane. Utilizing radars along the East Coast of the United States, the Weather Bureau tracked both Hurricanes Daisy and Helene for , which was the first such occurrence of that feat. The season's activity was reflected with a cumulative accumulated cyclone energy (ACE) rating of 121. ACE, broadly speaking, is a measure of the power of the hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high values. ACE is only calculated for full advisories on tropical systems at or exceeding 34 knots (39 mph, 63 km/h) or tropical storm strength. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1958 Atlantic hurricane season」の詳細全文を読む スポンサード リンク
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