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- Title
Statistical Characteristics of Unsteady Storms in Radar Observations for the Beijing-Tianjin Region.
- Authors
Wang, Yu; Wang, Hong-Qing; Han, Lei; Lin, Yin-Jing; Zhang, Yan
- Abstract
This study was designed to provide basic information for the improvement of storm nowcasting. According to the mean direction deviation of storm movement, storms were classified into three types: 1) steady storms (S storms, extrapolated efficiently), 2) unsteady storms (U storms, extrapolated poorly), and 3) transitional storms (T storms). The U storms do not fit the linear extrapolation processes because of their unsteady movements. A 6-yr warm-season radar observation dataset was used to highlight and analyze the differences between U storms and S storms. The analysis included geometric features, dynamic factors, and environmental parameters. The results showed that storms with the following characteristics changed movement direction most easily in the Beijing-Tianjin region: 1) smaller storm area, 2) lower thickness (echo-top height minus base height), 3) lower movement speed, 4) weaker updrafts and the maximum value located in the mid- and upper troposphere, 5) storm-relative vertical wind profiles dominated by directional shear instead of speed shear, 6) lower relative humidity in the mid- and upper troposphere, and 7) higher surface evaporation and ground roughness.
- Subjects
BEIJING (China); STORMS; METEOROLOGICAL observations; ATMOSPHERIC temperature; WIND speed; HUMIDITY
- Publication
Journal of Applied Meteorology & Climatology, 2015, Vol 54, Issue 1, p106
- ISSN
1558-8424
- Publication type
Article
- DOI
10.1175/JAMC-D-14-0043.1