"National Severe Weather Warning Service" . "Orange" . "extreme heat warning" . . . "Yellow" . . "Severe weather warnings" . . "amber weather warnings" . "amber extreme heat warning" . "National Severe Weather Warning Service" . . "National Severe Weather Warning Service" . "severe weather warning" . "Amber" . . "Amber weather warning" . "Red" . "Weather warnings" . "red weather warning" . "red warnings" . "red warning" .