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09:47: Onset of explosive event; DFR extremely strong, more than any other event. Plume to 8 km; ash to ENE; pyroclastic flow, moderate flood.
09:51: Level of concern color code upgraded to RED.
09:56: Pilot report of ash plume to 37,000 feet.
10:00: Lightning strikes noted on LDS.
10:05: DFR and DRE signal very strong suggesting flood in valley.
10:10: DROF crews report coarse to fine ash in upper valley; moderate flooding of Drift River; decision to evacuate.
10:15: DFR which has been very strong, now declining.
10:30: DFR returned to background levels.
10:45: Ash falling on oil platforms in W Cook Inlet.
10:50: Light ash fall at Nikiski.