SpatialTemporal Characteristics and Circulation Patterns of Hailing Days in Northwest Fujian
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Abstract:
Based on the conventional observation and radiosonde data at 850 hPa and 500 hPa from 1990 to 2008， the spatial and temporal features of hailing days and atmospheric circulation patterns over Fujian are analyzed. The results show that hail disasters occurred frequently in Northwest Fujian， and there were a decreasing trend in recent years. The monthly change of hail events presents a typical multiplepeak pattern with the big peak in April and two small peaks in July and November. Hails occurred mainly from 14:00 to 20:00. The hail events usually occurred solitarily， and the affected stations were less than three. From November to next May， the main circulation patterns at 850 hPa favorable for hail generation include “moderate warm shear，” “moderate vortex and cold shear，” “moderate cold shear，” and “eastward deflection trough.” The hailfalling probabilities in the pattern of “westslanting cold shear” and “northwardslanting warm shear” were smaller than those in “moderate vortex and shear，” and greater than that in “southslanting shear.” The 74.1% of hail days were associated with a strong lowlevel southwest jet， mostly “moderate jet” or “northslanting jet.” The main weather patterns affected three or more were “moderate warm shear，” “moderate vortex and cold shear.” The 81.5% of hail events were associated with the strong lowlevel southwest jet. From June to September， the circulation patterns at 500hPa favorable for hails were “peripheraltype subtropical high” and “small subtropical high，”and the probability of largescale hail weather was small.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.