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Shelter in place. Shelter in place (also known as a Shelter In-Place Warning SAME code: SPW) is to seek safety within the building you already occupy, rather than to evacuate the area or seek a community emergency shelter.
Current U.S. Government advice is to 'shelter in place' but you're probably better off making a run for it. A mathematical model of nuclear fallout suggests that sheltering in place is not always the best survival strategy. If you can reach higher quality shelter in less than 30 minutes after a nuclear blast, then go for it. If youâve got nothing, you definitely need to seek shelter immediately.