INTRO TO WEATHER
INTRO TO WEATHER MET 1010
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This 5 page Class Notes was uploaded by Maureen Ledner on Friday September 18, 2015. The Class Notes belongs to MET 1010 at University of Florida taught by Staff in Fall. Since its upload, it has received 16 views. For similar materials see /class/206629/met-1010-university-of-florida in Meteorology at University of Florida.
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Date Created: 09/18/15
Chapter 15 Part 2 Lightning What is lightning 0 Lightning is a discharge of electricity which occurs in mature thunderstorms 0 Most lightning cloud to cloud Only 20 cloud to ground 0 Lightning heats air 30000 C air expands explosively initiating sound wave called under Speed of Lightning and Thunder Light travels at 300000000 meterssecond Sound travels at 330 meterssecond It takes sound 3 seconds to travel lkm and 5 seconds to travel a mile Can determine distance away from time between lightning and thunder Sometimes atmosphere refracm thunder away Electri cation of Clouds 7 For lightning to occur 1 I opposite charges must exist within a cumulonimbus cloud 1 7 Unlike charges attract j Ground positively charged 7 under negative cloud vmjwif Dry air is a good insulator l l39iil W W Discharge of electrons rush towards cloud base and then towards ground Called stepped leader 0 Very faint usually invisible to human eye A current of positive charge starts upward from the ground to meet stepped leader This current usually starts from elevated objects 3 Cloud to Ground Lightning 0 When the two current meet electrons flow to the ground and a brighter return stroke surges upward to the cloud along the path followed by the stepped leader 0 Happens quickly 1 10000 sec so appears as one ash 0 The leader and stroke process Return stroke is usually repeated several times at intervals of 004sec Some Types of Lightning Ball lightning looks like a luminous sphere still not understood Sheet lightning ash occurs inside a cloud or obscured by clouds so that part of cloud is a luminous sheet Heat lightning light from distant electrical storms refracted usually appears orange St Elmos s Fire greenish bluish halo from continuous discharge on tall objects ship s mast Lightning Rods Lightning rod 7 j 31433an wimp MY 0 Lightning rods are tall 39 and pointed to attract lightning and stop it from hitting buildings Fulgurite When lightning enters sandy soil the high temperature fuses sand particles together Lightning Striking Cars Takes quickest path to ground along outside metal casing of vehicle Note marks Where lightning traveled along Sunshine State Parkway Lightning and Safety Can be electrocuted by lightning Average death toll in US is 100 most in Florida If someone is struck immediately give CPR Most fatalities occur in the vicinity of isolated trees which act as lightning rods
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