chapter1SevereWeather

chapter1SevereWeather - Disaster Science & Management...

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Hazards, Disasters and the Hazards, Disasters and the Environment Environment Severe Weather Severe Weather Part I Part I Louisiana State University Louisiana State University DSM 2000 Severe Weather 1
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Weather Basics: Air Pressure Represents the weight of the atmosphere on  the surface of the Earth Decreases with increasing altitude Measured in millibars (mb) or inches of  mercury. High pressure system denoted by the letter “H” on a weather map region of higher air pressure than the air around it Low Pressure system denoted by the letter “L” on a weather map region of lower air pressure than the air around it DSM 2000 Severe Weather 2
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Weather Basics: Pressure Gradient DSM 2000 Severe Weather 3 H L H L 1008 mb 1004 mb 1000 mb 992 mb 996 mb
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H L H L In the Northern Hemisphere: In the Northern Hemisphere: In the Southern Hemisphere: In the Southern Hemisphere: H L H L Weather Basics: Coriolis Force DSM 2000 4 Severe Weather
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Weather Basics: High and Low  Pressure Northern Hemisphere DSM 2000 Severe Weather 5 H L H L
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Weather Basics: Air Masses mP: Maritime Polar cA: Continental Arctic cP: Continental Polar mT: Maritime Tropical cT: Continental Tropical DSM 2000 Severe Weather 6 Source: http://www.srh.noaa.gov/jetstream//synoptic/airmass.htm
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DSM 2000 Severe Weather 7
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Weather Basics: Cold Front DSM 2000 Severe Weather 8 Colder temperatures Colder temperatures Warmer temperatures Warmer temperatures Source: http://www.srh.noaa.gov/jetstream//synoptic/images/coldfront.jpg
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Weather Basics: Warm Front DSM 2000 Severe Weather 9 Warmer temperatures Warmer temperatures Colder temperatures Colder temperatures Source: http://www.srh.noaa.gov/jetstream//synoptic/images/warmfront.jpg
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Cold and Warm Fronts 10 Source: http://www.srh.noaa.gov/lzk/images/martor/srnus.gif Source: http://www.crh.noaa.gov/lmk/soo/docu/wx_wrmfnt2.gif DSM 2000 Severe Weather
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Weather Basics: Stationary Front DSM 2000 Severe Weather 11 Warmer temperatures Warmer temperatures Colder temperatures Colder temperatures
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Weather Basics: Mid-Latitude  cyclone DSM 2000 Severe Weather 12 L
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Weather Basics: Occluded Front DSM 2000 Severe Weather 13 L L
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Weather Basics: Mid-Latitude  Cyclone DSM 2000 Severe Weather 14 L L L L L L
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Weather Maps DSM 2000 Severe Weather 15 Source: http://upload.wikimedia.org/wikipedia/commons/c/ca/Surface_analysis.gif
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electrical storm   associated with  lightning and  thunder typically  accompanied by  heavy rainfall,  strong winds, and  in more rare cases,  hail and tornadoes. DSM 2000
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chapter1SevereWeather - Disaster Science & Management...

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