Check the roof immediately. Put out any roof fires, sparks or embers. Check the attic for hidden burning sparks.
If you have a fire, get your neighbors to help fight it.
The water you put into your pool or hot tub and other containers wilt come in handy now. If the power is out, try connecting a hose to the outlet on your water heater.
For several hours after the fire, maintain a "fire watch." Re-check for smoke and sparks throughout the house.
