ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 40 Issue 8 > 2014,40(8):905-915. DOI:10.7519/j.issn.1000-0526.2014.08.001 Prev Next
Classification and Characteristics of Cloud Patterns Triggering Regional Thunderstorm High Winds
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Abstract:
Based on the satellite data, observational data of upper air and significant weather report from 2005 to 2011, the weather situation at 500 hPa and the cloud patterns of 18 processes of thunderstorm high winds are classified and analyzed. The development of cloud patterns can be divided into 4 stages: initial, growing, mature and dissipating. The brightness temperature difference between IR1 channel and water vapor channel is mostly negative, and the number’s decreasing indicates that the severe convective clouds are still developing. We need to pay more attention to the right part or the right single cell storm of the elongated strong convective clouds when we monitor and forecast the cloud system of thunderstorm high winds, especially the low TBB areas, the high TBB gradient part and the area coordinating with the negative area of IR1 and WV channel brightness temperature difference. Quantitative statistical analysis of the characteristic value are made on the basis of subjective analysis, and we get the distribution of the infrared brightness temperature, water vapor brightness temperature, channel brightness temperature difference and infrared brightness temperature gradient near the sites observing the thunderstorm high winds. We discover that the majority of thunderstorm high winds often take place during the period when the infrared brightness temperature develops from a sharp decline to a gentle decline and at the time point when the channel brightness temperature gently slows down or becomes stable. Moreover, most examples are near the time period when the channel brightness temperature difference changes from positive to negative, and at the point when the infrared brightness temperature gradient approaches the largest area or begins to decline.
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