Design, execution, and results of a mesoscale snowstorm modification project
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Design, execution, and results of a mesoscale snowstorm modification project

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Details:

  • Personal Author:
    Weickmann, Helmut K.
  • Corporate Authors:
    Atmospheric Physics and Chemistry Laboratory (U.S.)
  • NOAA Program & Office:
    OAR (Oceanic and Atmospheric Research)
  • Description:
    In the Great Lakes region of the U.S.A., shallow but intensive winter storms form through a combination of cold continental air moving over still unfrozen and even warm, large water surfaces. Depending on their trajectories over the lakes and their persistence, these storms may dump large amounts of snow onto the downwind shorelines. The natural freezing nuclei concentration causes the formation of heavily rimed crystals; seeding shall increase their number and prevent riming, causing smaller crystal fall velocities and consequently a larger transport of snow downwind and away from the urban and industrial centers near the shores. The experiment is designed around a mesoscale numerical model and microphysical model of snow crystal formation. The great variability of the cloud systems prevents a clear definition of a homogeneous sample of comparable experiments and makes, therefore, a clear statistical design impossible. The execution employs seeding from the ground and from the air, tracking of the seeding agent through the cloud system by an airborne freezing nucleus counter, and analyzing the Agl nuclei in the precipitated snow crystals. The analysis includes radar, surface observation stations, and airborne observations. Results indicate the capability to affect the snowfalls in the desired mode strongly depends on the cloud temperature, indicating that snowfall can be initiated, redistributed, or not be affected at all. The project continues.
  • Keywords:
  • Series:
    NOAA technical memorandum ERL APCL ; 15
  • Document Type:
    Technical Memorandum
  • Place as Subject:
    Great Lakes (North America)
  • License:
  • Rights Information:
    CC0 Public Domain
  • Compliance:
    Library
  • Main Document Checksum:
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  • File Type:

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