Advances in forecasting and radar technology now provide time for people to seek shelter as a storm approaches, saving countless lives.“Floods and tornados are the biggest killers,” said Larry Vannozzi, meteorologist-in-charge for the National Weather Service’s Nashville office, noting that advances in early warning technology have come a long way in the past decades. “Back then a tornado might already be on the ground before warnings were issued. Now there is a lead time of several minutes in most cases.”Vannozzi leads one of the 122 offices of the National Weather Service.