Using Radiosonde Data to Determine Warning Thresholds of Three Types of Strong Convective Weather in Hohhot Area
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
In this paper, based on the 16 physical quantities calculated by the Hohhot radiosonde station, the differences in physical quantities between the hail, thunderstorm gale and shortterm heavy precipitation in Hohhot from June to August 2012 to 2016 are analyzed. The results show that: (1) If the revised CAPE is greater than or equal to 1000 J〖DK〗·kg-1, the 0 ℃ layer height is about 4200 m and the -20 ℃ layer height around 7200 m, the temperature differences at 500 hPa and 850 hPa up to -25 ℃, and the height of the atmospheric temperature inversion layer is above 2 km. It can be basically determined that hail weather will occur. (2) Shortterm heavy precipitation depends more on the water vapor and has stronger thermal instability. The lowerlevel difference between temperature and dew point, Δθse (500-850) and Precipitable Water Vapor (PWV) are also important criterions for shortterm heavy precipitation weather. (3) The early warning indexes of strong convective weather in Hohhot can be established as: The revised DCAPE of a thunderstorm gale is significantly larger than that of hail and shortterm heavy precipitation weather, which is about twice as large as the other two types of weather， while the revised CAPE is slightly smaller. Finally, the threshold sizes of all kinds of forecast factors can be defined by means of the quartile division method, the method of ≥70% proportion (the proportion of severe convective weather samples is more than 70%) and the mean threshold method. The statistical test indicates that the hit rate of the threshold index determined by the mean method, up to more than 50%, is of higher reference value.
Keywords:
Project Supported:
Clc Number:
You are thevisitors
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.