Populations can be tropical.Logical formLearned from31 sentences. A low-pressure system can be tropical.Logical formLearned from31 sentences. Systems can be tropical.Logical formLearned from31 sentences. A typhoon may be downgraded to a tropical storm.Logical formLearned from31 sentences. A system may develop into tropical depression.Logical formLearned from30 sentences. A savannah can be tropical.Logical formLearned from30 sentences. A total can be constituted-of-or-filled-with some tropical cyclones.Logical formLearned from30 sentences. A tropical cyclone may undergo a development.Logical formLearned from30 sentences. Heavy rains can be from tropical storm.Logical formLearned from30 sentences. A system may become a tropical storm.Logical formLearned from30 sentences. Tropical storm may approach (hurricane strength).Logical formLearned from30 sentences. Rains can be from tropical storm.Logical formLearned from30 sentences. A hurricane may be downgraded to a tropical storm.Logical formLearned from30 sentences. A vengeance can be tropical.Logical formLearned from30 sentences. Tropical storm may form over a country.Logical formLearned from30 sentences.