This trajectory graphic is the output of a mathematical model showing wind direction and speed at different altitudes above sea level (HYSPLIT, NOAA). It does not contain information about ash emissions from the volcano.
Colored lines show the direction an ash cloud emanating from a point source (the volcano) would travel at different altitudes in feet above ground level. A given eruption cloud may not reach all altitudes shown.
Symbols are spaced one hour apart and reflect the forecast speed of the ash cloud.
This model is updated every 6 hours.
UTC to AKDT conversion (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