From: CNNWill volcano blow? Expert waits, watches, ready to warn
"For jet aviation, it's a very severe hazard because jet engines run at a very high temperature. And once that silica-rich ash gets ingested into the engine, it can remelt and coat the insides of the engines and freeze up those engines," says Coombs. "That's really the major thing we are trying to avoid here."
The day after the 1989 eruption of Redoubt, a 747 flew into an ash cloud near Anchorage and all four engines stalled. The pilot was able to get two of the engines restarted, and the plane landed safely. Coombs says airspace around the volcano and Anchorage may be closed if Redoubt erupts.http://www.cnn.com/2009/TECH/science/02/02/alaska.volcano/index.html
Alaska Volcano Observatoryhttp://www.avo.alaska.edu/activity/Redoubt.php
AVO on Twitter
Redoubt: Seismic activity at Redoubt continues at an elevated level and is well above background levels. The volcano has not erupted.A gas/observation overflight yesterday reported continued changes in the summit glaciers indicative of heating of the summit area. Photos from both the overflight and the hut webcam showed a small vapor plume at the summit. The web camera is now dark as our long winter night continues.http://twitter.com/alaska_avo
Anchorage Sunrise and Sunset tablehttp://www.timeanddate.com/worldclock/astronomy.html?n=18&month=2&year=2009&obj=sun&afl=-11&day=1
Mt. Redoubt, Wikipediahttp://en.wikipedia.org/wiki/Mount_Redoubt_(Alaska)