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BGSU - GEOG 1250 - Class Notes - Week 13 lecture notes

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BGSU - GEOG 1250 - Class Notes - Week 13 lecture notes

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background image Monday Lecture, 4/11
Types of thunderstorms o Single cell (air mass) thunderstorms Most dangerous thunderstorms in summer time Lightening danger Time duration/intensity o Multicell thunderstorms (gust front) Consists of a group of "cells" Shelf cloud ­ horizontal­wedge cloud associated with thunderstorm gust  front  Squall lines Edge of rain cooled air ­ gust front Hazards Straight line winds Hail Low intensity tornado  o Super cell  Usually holds the most severe weather  Mesocyclones Hazards Heavy rain Hail Tornados Supercell formation ??? Wall cloud  Low LCL  Tornado development?? o Classic supercells Precipitation patterns are separated from the tornado o HP supercell (high precipitation supercell) Visibility is very unclear and difficult to see due to heavy precipitation  around the tornado Flash floods ­ cannot drain water fast enough and the area starts to flood (short time  frame) o The NUMBER ONE thunderstorm killer o Moving and rising water can be very dangerous to drivers (can move cars and  cause hydroplaning) o Precautions Move to higher ground and stay away from drainage ditches/streambeds Do not drive in high water areas Hail  o Strong updrafts of thunderstorms  o Typical in multicell (squall line) storms and supercell storms
background image o Hail formation Ice crystal collects frozen water droplets and increases in size The hail will fall due to gravity, but if there is an updraft, the hail will be  lifted back up into the atmosphere and it will continue to grow in size Usually falls right next to the updraft when it is heavy enough to fall Destroys crops, property, etc Straight line winds /microbursts o Downdraft "splashing" effect next to the storm on the side o Microburst ­ smaller feature of downward splashing wind on side of the rain  storm (80­100 mph) o Macroburst ­ larger version of the above ^ o Squall lines and supercells o Hazard to air crafts Tornado  o Tornado vs. funnel cloud Tornado ­ violently rotating column of air which is connected from the  parent storm cloud to the ground Associated with UPdrafts Rotation ­ counter clockwise  Multiple individual tornados can happen inside on tornado Threats "Landspot" ­ a weak tornado that touched the ground  attached to a cumulous cloud "Water spout"  "Dust devil"  Supercells ­ most favorable environment for tornado to  develop Formation Rotating wall cloud will often cause a tornado underneath  the mesocyclone  Tornados on RADAR  Hook echo Velocity couplet TVS (tornado vortex signature) ­ rotating winds and a  tornado is issued Tornado intensity ­ 75% of all tornados are usually low intensities  Enhanced Fujita scale ­ measures tornado intensity  Only 1% of tornados are near the F5 intensity, most  are near the lower end F0 ­ Light (64­118 kmph) F1 ­ Moderate F2 ­  Considerable F3 ­ Severe F4 ­ Devastating

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School: Bowling Green State University
Department: Geography
Course: Weather and Climate
Professor: Marius Paulikas
Term: Summer 2015
Tags: lightning and tornado
Name: Week 13 lecture notes
Description: Week 13 lecture material
Uploaded: 04/17/2016
5 Pages 28 Views 22 Unlocks
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