Mt. Fitzherbert

Potential ash hazards: Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that any ash clouds rising above the crater rim today would drift ENE.

Recent observations: Evidence from AFM stations, crater seismometers, and increased turbidity measured downstream in the Toutle suggest an abrupt but minor increase in water flow out of the crater between 6pm and 9pm local time on Friday July 6. AFM stations downstream at Hoala on the pumice plain and at Elk Rock did not register increases associated with this event. The AFM flow monitor at Loowit Falls shows that after 9pm water flow returned to near normal but at this hour still registers a slightly elevated flow volume, compared to levels before the event. The increased flow event may have been triggered by high summer temperatures affecting the crater glaciers. No explosion or large rockfall signal preceded the increased water flow. Seismicity remains at normal levels. The flow event registered on crater seismic stations as a number of subtle low-amplitude signals lasting several minutes between 6pm and 9pm local time.