I live about 2 miles away from the NOAA weather station in South Jersey. This covers all of NJ, northern Delaware, eastern Pennsylvania and southern New York. Today they had an open house. There were some Air Force soldiers doing a demonstration of their portable weather station and handheld weather stations. There was a tour of the NOAA station as well. He showed us a doppler readout taken at the time that a couple of local kids died from a falling tree. You could clearly see a patch of strong wind blowing away from the radar side by side with another patch blowing toward the radar. This is a recipe for a tornado, but according to the guide, the two patches weren't close enough to create one. Everything is computerized now. If they want to issue a warning, it takes them seconds to send a coded message to all listeners. Listeners are radio and TV broadcasters and other private entities. The message consists of data points that describe the condition that caused the warning to go out. Listeners can determine whether the message is intended for their clients and can use the data in the message to create a natural language version for end users. We were told that serious warnings are sent to every cell phone in the danger area. I have never received such a message though.