Abstract
Acoustic Gravity Waves (AGW) and Internal Gravity Waves (IGW) concerned with various abnormal weather phenomena, such as storms, high wind, hail etc., in some local regions have been detected, recorded and studied. These waves, as a kind of perturbation with infrasonic frequenices, express different wave characteristics. Four to ten hours before the eruption of developing disastrous weathers, obvious perturbated waveforms can be recorded at a nearby infrasonic observatory. The analysis and understanding of these results has considerable practical meaning for the prediction of events. The spectral analyses for the whole process of hailing has been carried out, and a new classification for studying disastrous weather has been suggested. Furthermore, some possible practical applications of AGW and IGW to disaster forecasting have been discussed.
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