Abstract: Implementations of a tornado warning and avoidance system are provided. In some implementations, the tornado warning and avoidance system comprises a computer implemented method for receiving on a portable computing device a warning of an endangering tornado and an arrival timing of the endangering tornado. In some implementations, the computer implemented method further comprise displaying a selectable display element on the portable computing device for requesting avoidance destination mapping data away from the endangering tornado. In some implementations, in response to selection of the selectable display element, the avoidance destination mapping data is received and displayed on the portable computing device that includes a map showing a route from the user location to the avoidance destination. In some implementations, real-time navigation form the first computing device to the avoidance destination is provided.