The Red Cross has issued a preparedness message on how to be prepared for volcano disasters.
Preparing for Events, Volcanoes
Explosive volcanoes blast hot solid and molten rock fragments and gases into the air. As a result, ashflows can occur on all sides of a volcano and ash can fall hundreds of miles downwind. Dangerous mudflows and floods can occur in valleys leading away from volcanoes. If you live near a known volcano, active or dormant, be prepared to follow instructions from your local emergency officials.
Learn about your community warning systems and emergency plans.
Be prepared for the hazards that can accompany volcanoes:
Mudflows and flash floods
Landslides and rockfalls
Ashfall and acid rain
Make evacuation plans. If you live in a known volcanic hazard area, plan a route out and have a backup route in mind.
Check it out at http://www.oregonredcross.org/general.asp?SN=2844&OP=3039&IDCapitulo=663B0ID44V.