Characteristics and Key Predictors of Elevated Thunderstorm Hails in Western Hunan
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Abstract:
Using the conventional observation data from February to March from 2005 to 2014, the characteristics of temporal and spatial distribution, system configuration, as well as the ambient field of elevated thunderstorm hail in the western Hunan are analyzed Results reveals that hails occur more frequently in the south than in the north and middle areas in the concerning area with a diurnal variation The main influencing weather systems include upperlevel through, low level jet (LLJ) in 700 hPa and cold air, etc Indicators of potential forecast of the elevated thunderstorm hails are as follows: relative humidity greater than or equal to 92% at 850 hPa, 60% at 700 hPa， but smaller than or equal to 485% at 500 hPa； thermal front at 850 hPa with a threshold temperature difference of 13 ℃ per 5° of latitude； temperature difference between 700 hPa and 500 hPa greater than 15 ℃； wind speed of LLJ at 700 hPa greater than 16 m〖DK〗·s-1; vertical wind shear between 850 hPa and 700 hPa greater than 19 m〖DK〗·s-1； the height of 0 ℃ level lower than 3 to 4 km; and the height of -20 ℃ level between 6 to 7 km
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.