Typhoons usually go through the sea for at least a week to 10 days and become large by water vapor, which is very unusual for them to approach the Korean Peninsula just four days after the typhoon broke out, as like BAVI. And another feature is that BAVI collected energy so powerful as to reach 945 hPa in a short time.

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  Experts attributed the cause to the temperature of warm seawater. Earlier, NASA and the U.S. National Aeronautics and Space Administration said, the sea water temperature around the typhoon area and the Korean Peninsula is warm enough to reach 30 degrees. Typhoon BAVI grew energy by staying on the warm sea water for a long time at a very slow pace of about 3km/h after the outbreak.  

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  In particular, it is unusual that BAVI maintained its power even though it moved north into the West Sea. In usual, when typhoons move north, the force of the typhoon rapidly weakens due to the cold sea water. In BAVI's case, the unusually long rainy season caused a large amount of rain flowed into the West Sea, keeping the sea water warm.

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  Due to these characteristics of Bavi, we wondered if we could obtain similar observations and results to those of experts when we conducted data analysis of the predicted typhoon model.Therefore, we decided to check it through WRF simulation with predictions. Since the damage caused by the typhoon varies widely depending on the amount of precipitation and the strength of the wind, analysis of precipitation and wind will also be carried out.