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NOAA/National
Severe Storms Laboratory![]() |
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Hypothesis (Ziegler-3) concerning the role of thermal solenoids in developing vertical circulations across and localizing convergence along mesoscale boundaries |
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Conrad Ziegler on August 27, 1997 at 22:15:29: Vertical wind shear normal to and within the cool side of the mesoscale boundary increases during the afternoon from the action of a thermal solenoid which induces a thermally direct, frontogenetic secondary circulation. This evolution leads to increased moisture convergence to assist storm initiation and increased hodograph curvature to increase probability of updraft rotation. |
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Evaluate component of thermal solenoid and wind shear normal to the mesoscale boundary with aircraft stepped traverses and mobile soundings, and evaluate wind shear with clear air Doppler radar data. Correlate changes of the magnitudes of wind shear and solenoid based on averages over periods of 0.5-1 hour duration. |
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Either thermal solenoids are absent or locally increasing wind shear cannot be correlated via the horizontal vorticity equation in a sufficient number of cases. |
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The following appear in order; discussion points may directly refer to one or more comments preceeding it. Bob Rabin on September 02, 1997 at 13:57:02:
Click here to comment on this hypothesis. Please reference: ZIEGLER-3. |