NOTE: this web server is not maintained in an "operational" environment and should not be relied
upon for 24/7 access.
NOTE: please read below for official sources of forecasts.
HYSPLIT model volcanic ash cloud forecast guidance for current eruptions
in the Washington and Anchorage VAAC
areas of responsibility.
HYSPLIT model output forecast guidance charts with headers PHBE10 KWBC and PHBI10 KWBC are issued
by the National Weather Service (NWS) over
WAFS
and are made available, subject to the disclaimer on the respective web pages, by the NWS
TOC and
AWC.
They are also made available, subject to the disclaimer on the respective web pages, by the
NOAA Washington
VAAC, and
by the NOAA ARL (this web page) in the table below.
The HYSPLIT charts are NOT official forecasts;
they are guidance only.
No volcanic ash dispersion model forecasts (products kept online 2 days)
Timely delivery of data and products from this server over the Internet
is not guaranteed (see the disclaimer).
Due to unforeseen circumstances, HYSPLIT charts may not be on
this web site even though they have been issued by the NWS. Do not
rely on obtaining volcanic ash HYSPLIT products from this web site.
The 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 CURRENT SIGMET FOR WARNING AREA".
The visual ash cloud symbol and run description are at the lower center.
Current HYSPLIT Volcanic Ash Forecast Guidance
