Landfalling Northeast Pacific tropical cyclones and associated rainfall over the South Central United States, 1900-1991

Date

1992-12

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Abstract

An examination of synoptic weather patterns and regional-scale rainfall which accompany the passage of Northeast Pacific tropical cyclone remnants over the South Central United States culminated in a storm-by-storm climatology of these events for the period 1900 through 1991. During this time frame, at least 79 landfalling tropical cyclones (nearly half of the total) from the Northeast Pacific have contributed to rainfall over the South Central United States. Storms having the greatest impact make landfall over a relatively small area along the west coast of Mexico approximately 450 km long between 22~ and 25~. The period of landfall for these storms is generally between 12 September and 30 October. Moisture from the storms is advected northeastward due to a mid- to upper-tropospheric trough or cut-off low located over the western portion of the North American continent. A focusing feature or baroclinic zone, such as a front or a low pressure trough, provides the lift required for the production of intense rainfall. All parts of the region have felt the impact of individual storms from the Northeast Pacific, but the greatest rainfall amounts contributed by these storms have occurred from South Central through North Central Texas.

Description

Keywords

Cyclones -- United States -- Tracking, Rain and rainfall -- Texas, Rain and rainfall -- Oklahoma, Rain and rainfall -- New Mexico

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