Also here's a map showing the damage from MSH's 1980 eruption.
Looking at this and looking at the map above showing the scale? Sure fishing traffic in the Cook inlent could take a hit but the cities should be safe if ash covered if that volcano blows. The map shows Redoubt a few miles inland from the coast as well.
The Possible directed blast radius from the hazard report barely reaches Cook Inlet, much less Anchorage.