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- W2116743065 abstract "A rarely studied cause of flash flooding—the leading cause of weather-related fatalities in the United States—is from a type of convective cell called a low-echo centroid (LEC), where most of the reflectivity is within the warm portion of the cloud-bearing layer. Since the inception of the LEC classification, the definition has remained ambiguous and difficult to quantify. Operational identification of LEC convection is critical to anticipating flash flooding, because rainfall estimates from the Weather Surveillance Radar-1988 Doppler often are too low. Four LEC convective cases are examined in order to refine the definition and to provide the characteristic features of these storms. From the sample events, two types of LEC storms were identified that shared features that would assist in their operational identification. Analyses indicated that radar reflectivity 60 dBZ should exist within the cell, the cell should possess a long-lived steady-state reflectivity of 45–55 dBZ, and the LEC cell should have increasing reflectivity as height decreases. The development of a system to assist operational forecasters in identification of the atmospheric parameters favoring LEC convection, and the real-time recognition of LEC events to support flash-flood-warning decision making, is an important effort to reducing unwarned and/or unexpected flooding events." @default.
- W2116743065 created "2016-06-24" @default.
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- W2116743065 date "2008-10-28" @default.
- W2116743065 modified "2023-09-26" @default.
- W2116743065 title "Operational recognition of high precipitation efficiency and low echo centroid convection" @default.
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