Detailed observational study of a weak Echo region |
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| Authors: | Stephan P Nelson Roscoe R Braham Jr |
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| Institution: | 1. National Severe Storms Lab., NOAA, 73069, Norman, Oklahoma, USA
2. Department of Geophysical Sciences, The University of Chicago, 60637, Chicago, Illinois, USA
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| Abstract: | High resolution 3-cm weather radar was used to observe the three dimensional structure of a weak echo region of a severe convective storm in northern Minnesota, U.S.A. Observations show that a seemingly steady-state updraft in the lower portion of the storm broke into an unsteady structure in the upper levels. This is interpreted as indicating that precipitation loading gradually decelerated the upper reaches of the updraft, resulting in periodic breakout of a new updraft core on the inflow side. This periodic behavior of the updraft may be related to hailstreaks and what has been termed the multi-celled storm. |
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