The news broke on Wednesday that Oswalt had left the team, and there was no timetable for his return.
In a statement, GM Ruben Amaro said "There has been a tremendous amount of tornado activity near Roy's home in Mississippi resulting in several tragic deaths and significant devastation to the area.? Because of this, Roy is concerned about his family's well-being.?"
"He has chosen to take time to make sure there wasn't significant damage to his home, but more importantly, to make certain that his wife and children are okay," the statement continued.
Amaro went on to say that this storm struck almost a year to the day that Oswalts' parents' home was destroyed by a tornado.
Amaro was hopeful Oswalt would be back for his next start, but that the situation is still day-to-day.