Abstract
This study sheds new light on sentiment analysis of Twitter for natural disasters according to a magnitude of the importance of information and a multitude of regions and periods. First, this study finds that a winter storm plays a more important role in positive sentiment than negative sentiment based on the magnitude of the importance of information and the number of tweets. Second, people are more interested in sharing information about the weather, such as forecasts and reports, rather than the positive or negative sentiment according to the winter storm. Third, people actively utilize their Twitter for disaster preparation, response, and recovery. Fourth, the spatial patterns of the proportion of tweets in the US states are differentiated by weeks. The results show that governments should develop natural disaster policies by understanding a multitude of human responses, needs, regional characteristics, and periods.
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