PPT-Progress in CIGRE Working Groups on Lightning and Grounding

and IEEE Task Force on HVDC Line Design Member Report William A Chisholm WAChisholmieeeorg 19 July 2016 Meetings Attended Montreal May 2016 B256 Ground Potential Rise at Overhead AC Transmission Line Structures during Power Frequency Faults. Most of those discharges are cloudtocloud but about 30 end up as the cloudtoground discharge that we are most familiar with There are a number of websites that describe the atmospheric electrical discharge that we know of as lightning but the averag Photoclinometry. using . LANDSat. Imagery and . ICESat. Laser Altimetry . Jamika. . Baltrop. and . MyAsia. Reid . Mentor Malcolm A. . LeCompte. , Ph.D.. During the last century, ocean temperatures increased by approximately 1 Celsius degree. Long term observations of portions of the coastal. Edgar Hernandez. Geography 1700 – Natural Disasters . Source: "We Need Your Help!" NOAA Study Finds Fishing Tops U.S. Lightning Death Activities. . N.p. ., . n.d.. Web. 04 Mar. 2015.. The lightning lifecycle. Thunderstorm structure. Thunderstorms are classified into four major types, namely the . supercell. , . squall . line, . multicell. . single . cell. .. The strongest type is called the . supercell. , which can be as wide as 24 kilometers . By:Eyosias Lemma, Rahel Kahsai, Robel Seltene, Matthew Sam, Melanie Juarez. What is a thunderstorm, flood lightning and how does it form?. A thunderstorm is a storm with thunder and lightning and typically includes heavy rainfall. A flood is when an overflowing of a large amount of water beyond its normal confines, especially over what is normally dry land. Lightning is a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within . Lightning . Parameters for Engineering Applications. Department of Electrical and Computer Engineering. University of Florida, Gainesville, Florida. IV . International . Conference on Lightning Protection. Prevalence of Lightning Occurrences. In US, 42 fatalities per year; 10 times as many injuries from strikes. Of all deaths, about 15 % occur in organized sports; 25-30 % in recreational activities. Areas of greatest incidence in US. Supercell. Tornado 5 . to 10 miles northwest . of Cheyenne. By Rob Cox (NWS Cheyenne) . July 29, 2013 @ ~6pm. Photo Courtesy Steve . Apfel. Tornado . ~5 to 10 . miles Northwest of Cheyenne. 0.5 deg. Z ~15 min prior to Tornado. Name. Teacher. http://www.factmonster.com/ipka/A0772916.html. Lightning. Lightning results from the ….. Most lightning occurs within the ….. The average flash of lightning could turn on a ___________ bulb for more than ________ months.. Mike Tachick. Dairyland. Electrical Industries Inc.. Western Regional Gas . Conf. – Aug 2012. Protection Concepts. Minimize voltage difference between points of concern:. At worker contact points. Brian Carcione. WFO Huntsville, AL. Background – Total Lightning. WFO HUN has a long history (~11 . yrs. ) with SPoRT and Total Lightning from North Alabama Lightning Mapping Array. Convective Initiation from . Lightning and Climate Earle Williams MIT Franklin Lecture AGU Fall Meeting San Francisco, CA December 5, 2012 Outline Global perspective on thunderstorms and world views CAPE versus aerosol control of lightning in present climate Lightning and Severe Weather: A Comparison between Total and Cloud-to-Ground Lightning Trends Authors: Christopher J Schultz, Walter A. Petersen, and Lawrence D. Carey Published: Spring 2011 Introduction In US, 42 fatalities per year; 10 times as many injuries from strikes. Of all deaths, about 15 % occur in organized sports; 25-30 % in recreational activities. Areas of greatest incidence in US. Gulf states, Ohio River Valley, front range of Rocky Mountains, and parts of Southwest.