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contributor authorHolle, Ronald L.
date accessioned2017-06-09T17:31:11Z
date available2017-06-09T17:31:11Z
date copyright2014/03/01
date issued2013
identifier issn0027-0644
identifier otherams-86622.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4230201
description abstractational maps of cloud-to-ground lightning flash density (in flashes per square kilometer per year) for one or more years have been produced since the National Lightning Detection Network (NLDN) was first deployed across the contiguous United States in 1989. However, no single publication includes maps of cloud-to-ground flash density across the domain and adjacent areas during the entire diurnal cycle. Cloud-to-ground lightning has strong and variable diurnal changes across the United States that should be taken into account for outdoor lightning-vulnerable activities, particularly those involving human safety. For this study, NLDN cloud-to-ground flash data were compiled in 20 km by 20 km grid squares from 2005 to 2012 for the lower 48 states. A unique feature of this study is that maps were prepared to coincide with local time, not time zones. NLDN flashes were assigned to 2-h time periods in 5° longitude bands. Composite maps of the 2-h periods with the most lightning in each grid square were also prepared. The afternoon from 1200 to 1800 local mean time provides two-thirds of the day?s lightning. However, lightning activity starts before noon over western mountains and onshore along the Atlantic and Gulf of Mexico coasts. These areas are where recurring lightning-vulnerable recreation and workplace activities should expect the threat at these times, rather than view them as an anomaly. An additional result of the study is the midday beginning of lightning over the higher terrain of the western states, then the maximum activity moves steadily eastward. These storms pose a threat to late-afternoon and evening recreation. In some Midwest and plains locations, lightning is most frequent after midnight.
publisherAmerican Meteorological Society
titleDiurnal Variations of NLDN-Reported Cloud-to-Ground Lightning in the United States
typeJournal Paper
journal volume142
journal issue3
journal titleMonthly Weather Review
identifier doi10.1175/MWR-D-13-00121.1
journal fristpage1037
journal lastpage1052
treeMonthly Weather Review:;2013:;volume( 142 ):;issue: 003
contenttypeFulltext


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