NOTE: this web server is not maintained in an "operational" environment and should not be relied
upon for 24/7 access.
Use one of the following National Weather Service (NWS) links to see the
HYSPLIT model volcanic ash cloud forecast guidance for current eruptions
areas of responsibility
These charts, with headers PHBE10 KWBC and PHBI10 KWBC, are issued
by the NWS over
They are also made available by the NOAA
These HYSPLIT model output charts in VAFTAD-format consist of a series of maps showing the
forecast ash cloud in time and space. The 4 panels in any
column are for a single valid time after eruption.
Individual panels are for layers applicable to aviation operations
and are identified at the side of a panel with upper and lower
flight levels (FL) in hundreds of ft. The bottom panel is
a composite from the SURFACE to FL550.
For each column, the forecast valid time
separates the upper three panels from the composite panel.
Volcano eruption information is at the lower left. A description of
the input meteorology is at the lower right with a message to
"SEE VOLCANIC ASH SIGMETS AND ADVISORIES".
The ash cloud symbol and run description are at the lower center.
The HYSPLIT charts are NOT official forecasts;
they are guidance only.