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 to the east.

Recent observations: The morning dawns with a clear view of the crater from the Johnston Ridge Observatory. A weak steam-and-gas plume can be seen rising from the new dome, which continues to slowly extrude accompanied by occasional earthquakes. On most days there is a noticeable increase in seismicity during daylight hours on stations located in the crater, particularly YEL ("Yellow Rock") which is located ≈200 feet from the toe of the advancing Crater Glacier. Most of the events appearing on the YEL records are "glacier quakes" that occur within the rapidly-moving western lobe of the Crater Glacier. Scientists working at YEL this spring have reported gunshot-like sounds accompanying some of the larger glacier quakes. Glacier movement can be influenced by air temperatures, and the daily variability in seismicity recorded by YEL reflects this influence.