Formation Mechanisms of a Squall Line in Panxi Area
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Abstract:
Using the data of surface meteorological observation, regional automatic meteorological station observation, radar and satellites, and NCEP 1°×1° 6hour reanalysis, the formation mechanisms of a squall line weather process in the southern part of the Panxi area on 13 May 2018 is analyzed. The highaltitude trough gradually moved eastward to push the cold airflow to the east along the leeward slope, and then merged with the lowlevel warm air in front to form convection. The main trigger factor making the squall line weather process happen was the dewpoint front. The atmosphere around the squall line had the characteristics of dry at upper levels and wet at lower levels, high instability energy, strong vertical wind shear, large highlevel wind speed and the presence of an inversion layer before formation. The upper level jet stream and momentum downward transfer had a positive effect on the occurrence and strengthening of the squall line. The terrain had an effect on the formation of the squall line and the distribution of the weather phenomena.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.