Factors that affect the duration and intensity of short-duration heavy rainfall: radar analysis
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Abstract
Thunderstorms are formed and sustained by strong updrafts that carry water droplets to the upper portions of the cloud. These droplets precipitate and create accumulations on the surface, which, upon reaching a certain threshold, are classified as "locally intense short-duration rainfall." Such rainfall can cause damage to social and economic infrastructure and pose a risk to human safety. Predicting these storms is quite complex due to their significant spatial and temporal variability, as well as the intricate mechanisms and multiple factors that contribute to their formation. The primary objective of this research was to identify the meteorological factors that distinguish the occurrence of these intense events. To this end, a series of factors were selected as potential discriminants, which, according to physical laws and processes, influence the duration of precipitation. To assess the effectiveness of the storms, a comparison was made between cases that produced locally intense short-duration rainfall and those that did not exhibit similar phenomena. The most significant findings indicate that the length of the cloud system in the direction of its movement, the number of convective cells, and the simultaneous interactions with the system's movement speed are the factors that most significantly influence substantial precipitation accumulations.
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