Right now: from the flash to 24 hours

1. 0 sFlash

   Don't look at the light. Get down, face down, behind something solid. Cover your head and neck; hands under your body.

2. SecondsBlast wave

   It arrives after the light: several miles out it travels ~1 mile every 5 seconds. Stay away from windows and glass.

3. 2 minStay down

   At least 2 minutes, until the wind passes and debris stops falling.

4. < 10 minGet inside

   The sturdiest building you can reach within minutes: basement or center. If there's none, your home.

5. On enteringDecontaminate

   Outer clothing into a sealed bag. Shower with soap and shampoo, no conditioner.

6. 24 hStay inside

   Close doors and windows; turn off air conditioning or heating that pulls in outside air.

7. AfterStay tuned

   A battery or hand-crank radio. Leave or evacuate only when authorities say so, by the route they give.

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