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chapter1SevereWeather

chapter1SevereWeather - D isaster Science M anagement 2000...

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DSM 2000 Severe Weather Disaster Science & Management 2000 Hazards, Disasters and the Environment Severe Weather Part I Department of Geography & Anthropology Louisiana State University 11
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DSM 2000 Severe Weather 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 22
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DSM 2000 Severe Weather Weather Basics: Pressure 33 H L 1008 mb 1004 mb 1000 mb 992 mb 996 mb
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DSM 2000 Severe Weather H L In the Northern Hemisphere: In the Southern Hemisphere: H L Weather Basics: Coriolis Force 44
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DSM 2000 Severe Weather Weather Basics: High and Low Northern Hemisphere 55 H L
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DSM 2000 Severe Weather Weather Basics: Air Masses mP: Maritime Polar cA: Continental Arctic cP: Continental Polar mT: Maritime Tropical 66 Source: http://www.srh.noaa.gov/jetstream//synoptic/airmass.htm
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DSM 2000 Severe Weather 77
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DSM 2000 Severe Weather Weather Basics: Cold Front 88 Colder temperatures Warmer temperatures Source: http://www.srh.noaa.gov/jetstream//synoptic/images/coldfront.jpg
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DSM 2000 Severe Weather Weather Basics: Warm Front 99 Warmer temperatures Colder temperatures Source: http://www.srh.noaa.gov/jetstream//synoptic/images/warmfront.jpg
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DSM 2000 Severe Weather Cold and Warm Fronts 1010 Source: http://www.srh.noaa.gov/lzk/images/martor/ srnus.gif Source: http://www.crh.noaa.gov/lmk/soo/docu/wx_wrmfnt2.gif
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DSM 2000 Severe Weather Weather Basics: Stationary Front 1111 Warmer temperatures Colder temperatures
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DSM 2000 Severe Weather Weather Basics: Mid-Latitude 1212 L
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DSM 2000 Severe Weather Weather Basics: Occluded Front 1313 L L
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DSM 2000 Severe Weather Weather Basics: Mid-Latitude 1414 L L L L L L
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DSM 2000 Severe Weather Weather Maps 1515 Source: http://upload.wikimedia.org/wikipedia/commons/c/ca/Surface_analysis.gif
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DSM 2000 Severe Weather Thunderstorm electrical storm associated with lightning and thunder typically accompanied by heavy rainfall, strong winds, and in more rare 1616 Source: http://www.srh.noaa.gov/jetstream//tstorms/tstrmtypes.htm
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DSM 2000 Severe Weather I ngredients for a Thunderstorm 1. Fuel : Water Vapor 2. Instability 3. Lifting mechanism Convective lifting Orographic lifting Frontal lifting Convergent lifting 1717 Source: http://www.srh.noaa.gov/jetstream//synoptic/airmass.htm Source: http://www.srh.noaa.gov/jetstream//tstorms/ingredient.htm
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DSM 2000 Severe Weather Geography of Thunderstorms 1818 Source: http://www.atmo.arizona.edu/students/courselinks/fall04/atmo336/lectures/sec2/thunderstorm s.html
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DSM 2000 Severe Weather Stages of a Thunderstorm: Starts off as a cumulus cloud Grows into a cumulus congestus cloud Dominated by updrafts 1919 Source: http://www.srh.noaa.gov/srh/jetstream/tstorms/life.htm
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