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The utilization of the anomaly method in investigating the location of regional heavy rainfall induced by vortex

Author

Listed:
  • Nan Zhang

    (Institute of Heavy Rain, China Meteorological Administration
    Tianjin Key Laboratory for Oceanic Meteorology
    Tianjin Meteorological Observatory)

  • Xiaojun Yang

    (Tianjin Key Laboratory for Oceanic Meteorology
    Tianjin Meteorological Observatory)

  • Xiaobin Qiu

    (Tianjin Key Laboratory for Oceanic Meteorology
    Tianjin Institute of Meteorological Science)

Abstract

The forecast of torrential precipitation caused by vortex is a crucial and challenging aspect of rainstorm forecasting in North China. This paper analyzes the characteristics of atmospheric anomalies during the occurrence and development of two rainstorm events caused by vortex, “Case-20120721” and “Case-20160720”. The results show that if the temperature anomaly front was steep, the falling area of rainstorm was well corresponding with the intersection of temperature anomaly front and ground, and also with the bottom position of gradient zone of anomalous specific humidity. In cases with relatively gentle temperature anomaly front areas, the falling area of the rainstorm corresponded to the intersection of the negative axis of anomalous geopotential height with the ground and the center of specific humidity anomaly. Both cases were accompanied by strong vertical shear of horizontal anomalous wind, and the location where the negative central axis of the anomalous V wind field intersected the ground indicates that the cold air brought by the anomalous northerly wind corresponded well with the heavy rainstorm area at the top of the vortex. Additionally, the areas where the anomaly axes of moist vorticity and moist divergence column connect to the ground always corresponded to heavy precipitation areas. It is worth noting that initially, these axes of anomaly were vertical, but they began to tilt after the precipitation developed strongly.

Suggested Citation

  • Nan Zhang & Xiaojun Yang & Xiaobin Qiu, 2024. "The utilization of the anomaly method in investigating the location of regional heavy rainfall induced by vortex," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 120(15), pages 14179-14197, December.
    • Handle: RePEc:spr:nathaz:v:120:y:2024:i:15:d:10.1007_s11069-024-06767-y
    DOI: 10.1007/s11069-024-06767-y
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    References listed on IDEAS

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    1. Ning Jiang & Weihong Qian & Jun Du & Richard H. Grumm & Jiaolan Fu, 2016. "A comprehensive approach from the raw and normalized anomalies to the analysis and prediction of the Beijing extreme rainfall on July 21, 2012," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 84(3), pages 1551-1567, December.
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