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WEATHER NOTE: Record 12-and 24-Hour Deepening Rates in a Tropical Cyclone

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  • 1 U.S. Fleet Weather Central/Joint Typhoon Warning Center, Guam, Marianas Islands
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Abstract

On Nov. 10–11, 1971, 12- and 24-hr reductions of central sea-level pressure of 6.2 and 4.0 mb/hr, respectively, were recorded in typhoon Irma by aircraft reconnaissance. These are considered to be record deepening rates as compared to the previous extremes set by typhoon Ida (September 1958). The validity of the pressure readings is noted, and other observations in the eye region are discussed and compared with features characteristic of deep typhoons.

Air Weather Service, U.S. Air Force.

Abstract

On Nov. 10–11, 1971, 12- and 24-hr reductions of central sea-level pressure of 6.2 and 4.0 mb/hr, respectively, were recorded in typhoon Irma by aircraft reconnaissance. These are considered to be record deepening rates as compared to the previous extremes set by typhoon Ida (September 1958). The validity of the pressure readings is noted, and other observations in the eye region are discussed and compared with features characteristic of deep typhoons.

Air Weather Service, U.S. Air Force.

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