Due to expected high temperatures and heat index readings,  some Hannibal Public School facilities will release students early today. Superintendant Susan Johnson says the Early Childhood Center will dismiss at 10 a-m with all afternoon classes cancelled. Hannibal Career and Technical Center will dismiss at 11:30 with all afternoon classes cancelled. Hannibal High School will also dismiss at 11:30. Hannibal Middle School will dismiss at 11:55. However... all other Hannibal Public Schools with air conditioning will be in session all day.