Resuspension of Relic Volcanic Ash and Dust from Katmai: Still an Aviation Hazard (Abstract Only)

The volcanic ash from the Katmai Volcano Cluster and the Valley of Ten Thousand Smokes was continuously resuspended on September 20-21, 2003, because the northwest winds were strong. The volcanic ash cloud rose to over 1600 meters and ranged over 230 kilometers into the Gulf of Alaska. A number of things influenced the resuspension of the volcanic ash. These include the following: (1) the land surface and atmosphere were very dry before the eruption, encouraging the resuspension and atmospheric transportation of the relic volcanic ash that followed; (2) existence of strong enough winds to lift the ash over 1600 meters into the atmosphere; (3) complicated terrain with many mountains that were interspersed with gaps, valleys, and channels; (4) super adiabatic lapse rate for the troposphere below 850 mb; and (5) a strong subsidence inversion of about 1400-1600 meters. This presentation offers the forecaster an ability to: (1) detect the conditions necessary for resuspension of relic volcanic ash; and (2) immediately respond to that kind of an event.

  • Corporate Authors:

    Federal Coordinator, Meteorological Services & Support Research

    8455 Colesville Road, Suite 1500
    Silver Spring, MD  United States  20901
  • Authors:
    • Hadley, David
    • Hufford, Gary L
    • Simpson, James J
  • Conference:
  • Publication Date: 2004-11

Language

  • English

Media Info

  • Media Type: Print
  • Pagination: 1p
  • Monograph Title: Proceedings of the 2nd International Conference on Volcanic Ash and Aviation Safety, June 21-24, 2004, Alexandria, Virginia

Subject/Index Terms

Filing Info

  • Accession Number: 01000872
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 9 2005 2:02PM