Dear Jim:
Here are the main links that I have on my groups for nuclear fallout. These are good links I have compiled over time:
Nuclear Blast Effects
FAS Page (International)
FAS Page (USA)
A PBS Web Page
Star Destroyer.net
Narrative review of effects
Nukefix web page
Nuclear Fallout Maps for North America (FEMA based) at KI4U and at Richard Fleetwood’s SurvivalRing
List of North American Targets (Also at SurvivalRing)
Jet Stream Today (for high altitude fallout direction)
Regards, – Rourke (Moderator of the Jericho Discussion Group.)