The article discusses a new effective methodology for forecasting natural disasters. The technique is a combination of two methods of observing natural phenomena. The first method involves continuous monitoring of the electromagnetic signal observed at the epicenter of a future natural disaster. The second method, based on the signal trend analysis, predicts the moment of the expected natural event. The effectiveness of the methodology is demonstrated by the example of a retro predict of the Hunga-Tong volcano eruption, which confirmed the actual eruption date. Additionally, a prediction was made for the date of the future volcanic eruption.