Emergency personnel, not to mention countless volunteers, continue searching for survivors and, unfortunately, casualties after Sunday’s devastating tornado rocked parts of the city Joplin.

Emergency personnel, not to mention countless volunteers, continue searching for survivors and, unfortunately, casualties after Sunday’s devastating tornado rocked parts of the city Joplin.   Range Line, which took a direct hit, sustained significant damage and was closed at 15th Street. Commercial and residential structures, in some cases, were completely destroyed.   Many major streets in Joplin, including 15th and 20th, remain impassible after the storm brought down trees and power lines. St. John’s Regional Medical Center sustained damage and personnel are evacuating people near the hospital because of a possible broken gas main.   A spokeswoman for the medical center's sister hospital in Springfield said that facility was preparing to receive several patients from the Joplin hospital. Cora Scott says many of the patients were being taken to Freeman hospital in Joplin, while others will be flown to Springfield and a hospital in Arkansas as soon as it's safe to fly.   According to emergency personnel, the command triage, originally located in the parking lot of Home Depot, 3110 E. 20th St., is moving to the Joplin Lowe’s location, located at 2600 Range Line Road.   Authorities, according to the Joplin Globe, have set up another triage at Memorial Hall. The National Weather Service in Springfield is calling for a 40 percent chance of showers and thunderstorms, with thunderstorms likely for Monday.   The tornado that proved deadly also caused "significant damage" to at least four school buildings in the Joplin School District. Assistant superintendent Angie Basendorfer said school will be cancled Monday and probably for the next several days.    She says the twister damaged Joplin High, Cecil Floyd Elementary, Franklin Technology Center and the central office building. Some of the schools that escaped damage are being opened as shelters.   Missouri Gov. Jay Nixon has activated the National Guard following the deadly storms and tornadoes that have hit the southwest.   The governor also declared a state of emergency Sunday night. His office says that state and local law enforcement agencies are coordinating search and rescue and recovery operations in the stricken areas.