The Brief A heat advisory is in effect for several Southeast Texas counties on Tuesday. A heat advisory has been issued for Houston and several Southeast Texas counties on Tuesday. Heat advisory for Southeast TexasThe heat advisory goes into effect from 11 a.m. to 8 p.m. Tuesday for Southeast Texas. Heat stroke and heat exhaustionExposure to high temperatures can lead to heat stroke and heat exhaustion. However, if symptoms worsen or do not improve within an hour, seek medical help, as heat exhaustion can progress to heat stroke if not properly managed.