Abstract:

Using the information of the red rainstorm warning signals and the minute-level precipitation observation data of 1605 automatic stations in Liaoning province from 2015 to 2019, the inter-annual variation characteristics and spatio-temporal distribution of the red rainstorm warning signals and the short-term heavy rainstorm are counted.Furthermore, the centralized area and time of the red rainstorm warning signals are analyzed.The results showed that the number of red rainstorm warning signals from 2015 to 2017 has increased year by year, with a maximum of 147 in 2017.The advance time of red rainstorm warning signals has little decreased for the improvement of accuracy, with the minimum value of 19 minutes in 2018.The number of warning signals issued in 2019 has 59 less than in 2018, the advance time increases 29 minutes.The frequency of the red rainstorm warning signals is high in the southeast and low in the central areas.Statistics also show that the red rainstorm warning signals are mostly issued at night.In more than 50% of the cases, the time when the accumulated rainfall meets the issuing requirements of the red rainstorm warning signal is 90 minutes after the time with the maximum rainfall intensity.So, the occurrence time of the maximum rainfall intensity is an important indication for the issuing of the red rainstorm warning signal.To improve the surface effect on disaster prevention and mitigation, when considering the issuing of red rainstorm warning signals, the occurring time of the maximum rainfall intensity, the issuing time, the high-incidence area and the geography should be considered carefully.

Key words: Red rainstorm warning signal, Short-term heavy rainstorm, Maximum rain intensity