The Granite Falls tornado highlighted the need for people to have ample warning before severe weather strikes. The national weather serivce provides a warning network for homes or businesses that will automatically turn on radios when severe weather strikes. But not everyone in Minnesota is covered by the service. WCCO meterologist Paul Dougas says the service is centered in big cities, but the coverage gap is about to close. A bill that passed in the last Legislative session provides money to build 13 transmitters to make sure the entire state is covered. George Wilcox is a public affairs officer with the National Oceanic and Atmostpheric Administration or NOAA -- the organization that oversees the National Weather Service. He says NOAH weather radios operate 24 hours a day, seven days a week.