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NOAA/National
Severe Storms Laboratory![]() |
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Hypothesis (Crook) concerning the depth of lifting at a convergence line. |
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Andrew Crook on October 03, 1997 at 11:10:18: The depth that boundary layer air is lifted at a convergence line depends, among other things, on 3 parameters; the strength of convergence, the stability above the boundary layer and the flow above the convergence line. Analytical relations between the depth of lifting and these three parameters have been developed for an idealized convergence line. It is hypothesized that the depth of lifting for an observed convergence line will be approximately related to these parameters. |
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First, identify a boundary layer convergence line before moist convection has developed along it. Stability and flow aloft can be measured with M-CLASS and/or aircraft. Convergence can be measured with Doppler radar and/or mobile mesonet. The depth that boundary layer air is lifted will need to be measured by aircraft flights across and along the convergence zone. In order to verify the hypothesis, it will be necessary to find variations in the three parameters for the same convergence line. An individual line should exhibit variations in low-level convergence along it. Second, the stability aloft should decrease as the boundary layer heats up. Finally, the flow across the convergence line will vary if the orientation of the line varies. Hence an individual line should exhibit variations in the three parameters, which we hypothesize will be correlated with changes in the depth of lifting. |
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If the depth of lifting shows no dependence to the three parameters, or the opposite dependence to that predicted. |
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The following appear in order; discussion points may directly refer to one or more comments preceeding it. Steve Koch on October 22, 1997 at 17:03:22:
Andrew Crook on October 24, 1997 at 12:01:38:
Click here to comment on this hypothesis. Please reference: CROOK. |