The Analysis Between Foshan Heavy Precipitation and Pre-Signal of Sliding Discrete Power Spectrum on Micromanometer

Using the sliding discrete power spectrum processing of the atmospheric pressure data collected by Foshan micro pressure meter station, taking 3 hours as the window, we decomposed the 2-90 min signal. The correlation analysis was carried out for the follow-up heavy rainfall process. The results show that the micro barometer sliding discrete power spectrum pre signal occurred about 1 hour before the occurrence of heavy rainfall, and was accompanied by the rainfall enhancement. The signals of wind and pressure field had no early warning signal for heavy rainfall, but only had possible response when the precipitation was in progress. For more than 70% of heavy precipitation processes, the signals can be forewarned for 0.5 h, and 50% can be ahead of 1 h. The front signal of micro barometer sliding discrete power spectrum can be used as one of the early warning signals of shortterm severe convection In the future, and the signal would be systematized or added to the meteorological models.