770  Call me ASAP
771  Call me STAT
772  Turn on the news

880  Seek safety in town
881  Seek hiding in town
882  Leave town
883  Seek rendezvous point
884  Head NORTH, seek civilization
885  Head NORTH, avoid civilization
886  Head SOUTH, seek civilization
887  Head SOUTH, avoid civilization
888  Revolt, under-ground
889  Revolt, above-ground

990  Hurricane, flood, tornado, earthquake
991  Chemical spill, release, or warfare
992  Unrest, rioting, gangs, or police strike
993  Terrorist threat, activity, or action
994  Uncontrollable fire
995  Nuclear threat, meltdown, or blowover
996  Biological release, outbreak, or warfare
997  Electricity or drinking-water outage
998  Government oppression
999  War, invasion, or draft