This page contains text of weekly and periodic updates that AVO distributes to numerous concerned agencies and institutions. Activity reported here is that which is likely to pose significant hazard to aircraft or local populations. This is not a catalogue of all volcanic phenomena that come to our attention. Several periods of increased seismicity during the past 24 hours indicate that the eruption is episodic and characterized by ejection of incandescent material to elevations of probably less than 10,000 feet above sea level.
Weather is poor and inhibits visual observations.
AVO has received no eyewitness descriptions of activity over the weekend. Spatter-fed lava flows emanate from the summit vent on occasion. Mudflows and some flooding could be expected in the Cathedral River valley north of the volcano. Airborne ash hazards to aircraft may be considerable if a large explosive event occurs but much less severe during a typical Strombolian phase. AVO has a seismic network of six stations near the volcano.