exam 3 in class notes

exam 3 in class notes - Severe Thunderstorms thunderstorm:...

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Severe Thunderstorms 12/03/2008 09:04:00 One or more of the following criteria to be considered a severe thunderstorm: Damaging wind… 58 mph wind Large hail… 1.9 cm plus Tornado or funnel cloud has to be spotted o A tornado is a funnel cloud that touches the ground Usually accompanied by intense lightning Severe Thunderstorm Development Intense Mid-latitude cyclone o Moves relatively fast o Very large temperature difference between warm front and cold front o Most severe thunderstorms are associated with the spring time of the year Unstable air Strong upper level divergence Mid-level temperature inversion High dew point Wind profile that increases with height Good cell interaction o Gives you good and bad things that happen Supercell storm Severe weather occurs as strong downburst
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Large hail Occasional flash floods Weak to violent tornadoes Severe events almost always occur near the updraft/downdraft interface typically in the rear storm flank (southwest). Some super cells have the interface on the front or southeast flank. High predictability of occurrence of severe events once storm is identified as a super cell Extremely dangerous to the public Extremely dangerous to aviation Supercell TWR’s 2000/3000 annually in the USA Smallest number of events the greatest cause of Death, Injuries, and Damage Most Violent Weather 1 cell storm 10 to 30 miles in diameter Vertical wind profile that increases with height Mesocyclone tornadoes Inversion layer that helps intensify the storm Need good surface heating Radar return of a supercell thunderstorm     Circle picture… that looks like a cell     Big area of rain, area of hail inside the rain… it is the dashed area     Inflow is the area inside of the cell    
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Hook echo is to the left     Mesocyclone is around the inflow and weak echo region     QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. This will be on the exam!! Wind profile Inflow from the upper-right quadrant in a supercell thunderstorm
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QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. Single cell storms Severe weather is limited to brief, isolated o Downburst o Small hail o Heavy rain o Weak tornadoes Single cell thunderstorms are wimpy… do not fly through them in a       small aircraft Severe events can occur anywhere within the generally disorganized storm Low degree of predictability of severe events Low to moderate danger to the public, moderate to high danger to aviation Mesoscale Convective Complex (MCC) Covers large areas Long lasting Found in the great plains area Form from Air Mass TWR’s Strong low-level flow of warm moist air Gust fronts produce new cells
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exam 3 in class notes - Severe Thunderstorms thunderstorm:...

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