ARL News
National Volcanic Ash Operations Plan
August 30, 2007
The Office of the Federal Coordinator for Meteorological Services and Supporting
Research (OFCM) will soon publish the "National Volcanic Ash Operations Plan for Aviation and
Support of the International Civil Aviation Organization (ICAO) International Airways Volcano
Watch". ARL's role, outlined in the plan, is to conduct research to improve volcanic ash
dispersion forecast guidance and transfer updated capabilities to the NWS National Centers
for Environmental Prediction (NCEP) for operational use. A description of the HYSPLIT
(Hybrid Single-Particle Lagrangian Integrated Trajectory) transport and dispersion model is
included in the plan.
Background: ARL volcanic ash involvement goes back to the 1980 Mt. St. Helens eruption when
trajectory forecast products were issued. By the 1989-1990 Mt. Redoubt, Alaska, eruptions,
ARL trajectories were sent to the NESDIS Satellite Analysis Branch, which issued products to
the FAA and others. In 1997 ICAO designated a network of Volcanic Ash Advisory Centers (VAAC),
two of which NOAA operates. The U.S. VAAC area of responsibility includes the U.S., most of
the North Pacific, Central America, the Caribbean, and northern South America. The VAACs issue
text and graphical advisories and HYSPLIT model output. In the last ICAO 18-month reporting
period about 3500 advisories and 100 dispersion forecasts were issued by the U.S. VAAC.
The OFCM Plan "supports the observing, tracking, monitoring, forecasting and reporting of
volcanic ash in the atmosphere as it affects the safety of flight operation in the U.S. ...
and U.S.[air-traffic-] controlled international/oceanic service." NOAA signatory organizations
to the plan are the NWS Office of Climate, Water, and Weather Services, the NESDIS Office of
Satellite Data Processing and Distribution, and ARL. Other signatory agencies are the Federal
Aviation Administration, U.S. Geological Survey, U.S. Air Force, NASA, and the Smithsonian
Institution.
Significance: Volcanic ash can cause significant impacts to aircraft and aviation over a wide
region. These impacts can include damage to aircraft and interruption of engine operation. The
aviation community relies on NOAA’s volcanic ash warnings, satellite analyses, and forecasts
for supporting safe operations.
More Information:
http://www.ofcm.gov/p35-nvaopa/fcm-p35.htm
Contact information: Barbara Stunder
Phone: (301) 713-0684
e-mail: barbara.stunder@noaa.gov
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