In reply to tango_kid:
SAIS has great info / education stuff as well as the forecasts so definitely a first port of call. In general (though late for this trip) I'd recommend Bruce Temper's Staying alive in avalanche Terrain - a great read to brush up each season and has lots of decision making tools described to help you make a good decision.
National Avalanche centre (US based, not UK!) website has lots of info
http://www.fsavalanche.org/
And Glenmore's avalanche quiz is really good little refresher too:
http://www.glenmorelodge.org.uk/outdoor-resources/avalanche-information/ava...
LAst but not least - BCA's website has good stuff on search and rescue techniques if your party is caught.
http://backcountryaccess.com/learn-avalanche-safety/
Ski orientated, but still mostly very valid.
Cheers!
Stu