The distribution of summertime lightning as a function of low-level wind flow in central Florida
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The distribution of summertime lightning as a function of low-level wind flow in central Florida

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  • Personal Author:
  • Corporate Authors:
    Environmental Research Laboratories (U.S.). Environmental Sciences Group
  • NOAA Program & Office:
    OAR (Oceanic and Atmospheric Research)
  • Description:
    The effects of different prevailing wind flow regimes on the spatial and temporal distributions of cloud-to-ground lightning are studied using flash data for three summers in central Florida (total, 646,839 flashes). The flow regimes are characterized by the mean 1000-700 mb wind direction. Classification as calm, onshore/offshore, and parallel/antiparallel is based on the morning sounding at Kennedy Space Center (KSC). The results indicate that prevailing winds determine both the spatial pattern and magnitude of the lightning activity. On the onshorewind coast, lightning activity develops earlier in the day and moves very rapidly inland, approaching the activity on the opposite shore. On the offshore-wind coast, the flashes develop later, and the activity is more intense and is slowly moving or stationary. Days with flow parallel to the coast behave similarly to days with weak wind speeds; in these cases, flashes appear along both coasts and the activity moves slowly inland from both sides. The prevailing flow direction is also related to the overall degree of stability and moisture contents that are favorable for, or detrimental to, deep convection. Maps for each of the five regimes present the daily total number of flashes and the percentage of days with flashes; sample hourly maps show the evolution of the spatial and temporal distributions of lightning.
  • Keywords:
  • Series:
    NOAA technical memorandum ERL ESG ; 28
  • Document Type:
    Technical Memorandum
  • Place as Subject:
    Florida
  • License:
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    CC0 Public Domain
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    Library
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