Volcanic Ash Model Details

Volcanic Ash Model Details Dispersion Simulations Using HYSPLIT HYSPLIT is set to use the same volcanic ash source term and produce look-alike output graphics as VAFTAD (Heffter and Stunder, 1993). The main differences between running HYSPLIT for volcanic ash and running HYSPLIT at the ARL HYSPLIT web page (unregistered or registered) is in the source term (the initial conditions…

Volcanic Ash Modeling History

Volcanic Ash Modeling History Following the 1980 eruption of Mount St. Helens, a NOAA – Federal Aviation Administration (FAA) Memorandum of Understanding (MOU) on Volcanic Hazards Alert became effective in 1988. ARL’s contribution was to provide forecast trajectories. However, trajectories are limited in that they only provide a representation of the transport paths of single…

ARL News: National Volcanic Ash Operations Plan – August 30, 2007

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…

Volcanic Ash

Volcanic Ash Modeling Mt. Augustine volcanic eruption(Credit: Cyrus Read, U.S. Geological Survey) Volcanic ash is a hazard to aircraft because it can degrade engine performance and navigational and operational instrumentation. Operationally, the NWS runs the ARL-developed HYSPLIT model to forecast the transport and dispersion of volcanic ash in and near the U.S. Volcanic Ash Advisory Centers'(VAAC) (Anchorage,…

ARL Weekly News – August 20, 2021

ARL Weekly News – August 20, 2021 Recent Events EPA Visit to Beltsville NADP and CASTNet Site On Tuesday August 17, two high school interns and a staff member from US EPA’s Clean Air Market Division visited the National Atmospheric Deposition Program (NADP) and Clean Air Status and Trends Network (CASTNet) site in Beltsville, MD.…

ARL Weekly News – August 13, 2021

ARL Weekly News – August 13, 2021 Recent Events Summer Intern Season Winds Down Justin Bettenhauser finished up his internship by giving a presentation at the Lapenta Intern Presentation Workshop on Thursday August 12th. The presentation was titled “Evaluation of Probabilistic Volcanic Ash Forecasts produced using the HYSPLIT model and the Global Ensemble Forecast System…

HYSPLIT – 2

HYSPLIT Description The HYSPLIT model is a complete system for computing simple air parcel trajectories, as well as complex transport, dispersion, chemical transformation, and deposition simulations. HYSPLIT continues to be one of the most extensively used atmospheric transport and dispersion models in the atmospheric sciences community. A common application is a back trajectory analysis to…

ARL Weekly News – June 11, 2021

ARL Weekly News – June 11, 2021 Recent Events Boundary Layer Workshop Temple Lee, Michael Buban, LaToya Myles, Bruce Baker, and Rick Saylor participated in the Second Boundary Layer Workshop, hosted by Tilden Meyers and David Turner on 1-2 June. The workshop sought to prioritize scientific questions associated with the atmospheric boundary layer and to…

2020 HYSPLIT Accomplishments and Notable Use Cases

2020 HYSPLIT Accomplishments and Notable Use Cases January 21, 2020 2020 Accomplishments in HYSPLIT Development Record Number of HYSPLIT runs in 2020 The ARL developed HYSPLIT tool for atmospheric transport and dispersion modeling hosted over 2 million runs in 2020. The 2,055,410 simulations on the READY server marks a 34% increase from the previous year.…