Physical-meteorological conditions that favored three types of local severity on April 29, 2015
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Abstract
Severe Local Storms are among the most complex and high impact meteorological phenomena due to their severe nature and rapid evolution. Continuing to investigate the conditions that originate them continues to be a necessity of the first order. On April 29, 2015, there were three types of manifestation local severity in different storms almost simultaneously in La Habana, western region of Cuba, turning the meteorological situation into a rare case. The objective of this research was to know the physical-meteorological conditions that gave rise to this event. For this, was made a synoptic, mesoscale and thermodynamic analysis of different variables, were taken into account the outputs of the Rapid Refresh Weather Numerical Forecast Modeling System as well as the interpretation of the images from the meteorological satellite and radar tracking. The results showed that the slow movement of the prefrontal electrical storm line propitiated the interaction of two structures convective (Sea-Breeze Front and Horizontal Convective Rolls) resulting in a mesoscale line on the north western coast. As consequently, there were strong downdraft favored by a dry layer in the middle levels which caused the hail to fall to the ground. High values of relative humidity in surface and its deepening in the column tropospheric resulted in intense short-term rain in the prefrontal line.
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