Numerical simulation of sea and bay breezes in a weak shear environment |
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Authors: | D Lu L White R S Reddy P J Croft J M Medlin |
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Institution: | (1) Department of Physics, Atmospheric Sciences and General Sciences, Jackson State University, Jackson, USA;(2) Department of Geology and Meteorology, Kean University, Union, New Jersey, USA;(3) NWSO Mobile, Alabama, USA |
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Abstract: | Summary A numerical mesoscale model (COAMPS) is used to study some of the features associated with the evolution of the kinematic,
thermodynamic, and physical structure of the Alabama sea and bay breeze circulations and convections in weak shear environments
based on five cases from Medlin and Croft (1998). The general and expected features and evolution of sea and bay breeze circulations
are captured by the model simulations, including horizontal and vertical wind shifts, thermal contrast between land and water
surface, vertical stability over water and land, return currents and moisture increase. The relationship of the circulations
to specific synoptic flow regimes and local physiographic features was investigated. The sea breeze triggered convective cells
are confirmed to have a preferred location according to the flow regime and local conditions. This result can assist the forecasters
in understanding the anticipated convective cell initiation and development on a given day as related to sea and bay breeze
cells as well as improve the short-term forecast accuracy of the location of thunderstorm initiation based on routine observations
and subsequent convective activity. If local NWS office model a selective subset of cases then they can better visualize and
forecast those cases operationally. |
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