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Stalled Pulsing Inertial Oscillation Model for a Tornadic Cyclone

by Nasa Technical Reports Server (Ntrs) , Robert C. Costen
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Current price ₹1,565.00
Original price ₹1,770.00
Original price ₹1,770.00
Original price ₹1,770.00
(-12%)
₹1,565.00
Current price ₹1,565.00

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Book cover type: Paperback
  • ISBN13: 9781289145293
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Bibliogov
  • Publisher Imprint: Bibliogov
  • Publication Date:
  • Pages: 60
  • Original Price: GBP 13.99
  • Language: English
  • Edition: N/A
  • Item Weight: 127 grams
  • BISAC Subject(s): General

A supercell storm is a tall, rotating thunderstorm that can generate hail and tornadoes. Two models exist for the development of the storm's rotation or mesocyclone - the conventional splitting-storm model, and the more recent pulsing inertial oscillation (PIO) model, in which a nonlinear pulse represents the supercell. Although data support both models and both could operate in the same supercell, neither model has satisfactorily explained the tornadic cyclone. A tornadic cyclone is an elevated vorticity concentration of Rossby number approximately 1000 that develops within the contracting mesocyclone shortly before a major tornado appears at the surface. We now show that if the internal temperature excess due to latent energy release is limited to the realistic range of -12 K to +12 K, the PIO model can stall part way through the pulse in a state of contraction and spin-up. Should this happen, the stalled-PIO model can evolve into a tornadic cyclone with a central pressure deficit that exceeds 40 mb, which is greater than the largest measured value. This simulation uses data from a major tornadic supercell that occurred over Oklahoma City, Oklahoma, USA, on May 3, 1999. The stalled-PIO mechanism also provides a strategy for human intervention to retard or reverse the development of a tornadic cyclone and its pendant tornado.

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