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01:40: Onset of seismic event.
02:07: Eyewitness accounts from Kenai report "flashing lights" in direction of Redoubt.
03:38: Onset of seismic event, lasts about 10 minutes at flank stations.
03:39: Pilot reports of ash clouds from Redoubt to Talkeetna.
04:30: Seismicity back to lower levels with some 15-30 second bursts.
09:16: Seismicity increases.
10:15: Onset of major seismic event, lasts 40 minutes at SPU. Plume to 12+km; ash to NE; ice avalanches; major lahars and floods.
10:25: Pilot report of ash plume to 40,000+ ft.
10:30+: Ash and pumice fall at Big River Lakes Lodge, 25 miles northeast of Redoubt. Caretakers of the lodge report strong sulfur smell detected during the ashfall, and that lightning was seen and thunder heard in the direction of Redoubt before ash fell. Pumice disk-shaped and up to 10 cm in diameter. Duration of ash fall estimated at 1 hour 20 minutes.
11:00: Eyewitness account of dark cloud over Trapper Creek.
11:50: Boeing 747 encounters ash cloud north of Anchorage, loses power in all 4 engines. After descending about 13,000 feet, engines are restarted and jet lands safely at Anchorage International Airport.
12:00: Dark cloud passes Trapper Creek and ash begins falling for an estimated 1.5 hours.
12:00+: Ashfall between 1200 - 1300 at Denalit National Park Headquarters, lasting an estimated 2 hours. Pilot report of vigorous ash plume between 15,000 - 18,000 ft. rising from central vent. Two vents described, one venting ash and one venting steam.
13:30: Decline in seismic activity, remains at low level for approximately 6 hours.
19:23: Increase in seismic activity.