Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29w..57p&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 23, pp. 57-1, CiteID 2142, DOI 10.1029/2002GL015488
Physics
1
Meteorology And Atmospheric Dynamics: Lightning, Meteorology And Atmospheric Dynamics: Convective Processes, Meteorology And Atmospheric Dynamics: Mesoscale Meteorology, Meteorology And Atmospheric Dynamics: Atmospheric Electricity, Atmospheric Composition And Structure: Cloud Physics And Chemistry
Scientific paper
On 4 July 1999, a severe convective windstorm, known as a derecho, caused extensive damage to forested regions along the United States/Canada border, west of Lake Superior. There were 665,000 acres of forest destroyed in the Boundary Waters Canoe Area Wilderness (BWCAW) in Minnesota and Quetico Provincial Park in Canada, with approximately 12.5 million trees blown down. This storm resulted in additional severe weather before and after the occurrence of the derecho, with continuous cloud-to-ground (CG) lightning occurring for more than 34 hours during its path across North America. At the time of the derecho the percentage of positive cloud-to-ground (+CG) lightning measured by the Canadian Lightning Detection Network (CLDN) was greater than 70% for more than three hours, with peak values reaching 97% positive CG lightning. Such high ratios of +CG are rare, and may be useful indicators of severe weather.
Murphy Brian P.
Price Colin G.
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