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The San Antonio Fire Department says it's responding to more than twice as many heat-related illness calls as at this time last year. From June 1st to July 20th of last year, emergency crews responded to 182 heat-related illness calls. In that same time frame this year, the number of calls was 396. San Antonio has had 42-days of triple-digit temps, and officials are advising residents to stay hydrated and keep out of the sun during the hottest hours of the day.