Image from the King Salmon NEXRAD weather radar showing the volcanic cloud at Fourpeaked Mountain volcano on September 17, 2006 at 12:40 ADT (20:40 UTC). The color scheme shows a scale of radar reflectivity from light blue (low) to dark green (moderate), which corresponds to greater numbers and/or sizes of particles in the atmoshphere. It cannot be determined from this data alone whether the radar signal is due to large water droplets, ice particles, coarse-grained volcanic ash, or a mixture of these. Picture Date: September 19, 2006
Image Creator: Schneider, Dave;
This image was produced by David Schneider, USGS-Alaska Volcano Observatory using data and software provided by the NOAA National Climatic Data Center.
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Source : Alaska Volcano Observatory (http://www.avo.alaska.edu)
URL: http://www.avo.alaska.edu/image.php?id=11086