HYSPLIT model volcanic ash cloud forecasts for hypothetical eruptions Volcanoes may be added to or removed from this list without notice, which may cause direct links to model output for a certain volcano to fail. Timely delivery of data and products from this server through the Internet is not guaranteed (see the disclaimer).
The table above contains volcanoes in and near the Washington and Anchorage VAACs' area of responsibility. The charts are updated four times a day (about 0530, 1130, 1730, and 2330 UTC) whether the volcanoes have erupted or not. The time of the hypothetical eruption is twelve hours after the initialization time of the NCEP forecast, and the ash column top and eruption duration are arbitrary. These charts are for planning purposes only. If one of these volcanoes has erupted, do not use the charts above; see the products from the appropriate VAAC or use the links here for more information. Washington VAAC -- Volcanic Ash AdvisoriesAnchorage VAAC --- Volcanic Ash Advisories Tokyo VAAC --- Volcanic Ash Advisories HYSPLIT for current eruptions Trajectories from Alaskan Volcanoes Related linksHYSPLITRun HYSPLIT for any volcano. VAAC Montreal - automatic trajectories VAAC Montreal - automatic CANERM VAAC Washington - satellite imagery Wisconsin - satellite imagery Geological updates for US and Russian volcanoes Worldwide Weekly Volcanic Activity Report USGS Volcano observatories Others Information The HYSPLIT model output in ICAO-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 the hypothetical 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. Hypothetical volcano eruption information for the model simulation is at the lower left. A description of the input meteorology is at the lower right. The visual ash cloud symbol is at the lower center. Reduced Ash: For some volcanoes, the dispersion model forecasts a larger ash cloud than what is observed, partly because of water vapor in the eruption column. Operationally HYSPLIT output is given in a "reduced ash" mode (see label at center bottom of chart) when satellite imagery shows a smaller ash cloud. HYSPLIT output here is from 2 modes: the standard mode and a reduced ash mode. Differences between them, if any, reflect some of the uncertainty in defining the eruption column.
Inquiries should be addressed to: |
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barbara.stunder@noaa.gov