These graphics depict a simulation of the direction and speed of potential ash cloud motion from Semisopochnoi. IF a significant ash cloud were generated
by the current eruption. It does not mean that such an ash cloud has been produced. These models are run every 6 hours independent of the current eruptive
state of the volcano. Each colored line indicates the direction a cloud would travel at different altitudes (see key below map plot).
Here is how to convert from UTC to AKDT (Alaska Daylight Time):
0000 UTC= 4:00 PM AKDT on the previous day as UTC
0600 UTC= 10:00 PM AKDT on the previous day as UTC
1200 UTC= 4:00 AM AKDT on the same day as UTC
1800 UTC= 10:00 AM AKDT on the same day as UTC
Model output by NOAA ARL, please see http://www.arl.noaa.gov/ready/traj_alaska.html
for more information.