Lecture12_111711

Lecture12_111711 - Mesoscale Weather Lake Effect Snow /...

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Mesoscale Weather Lake Effect Snow / Wind Chill (finish Winter Weather) Mountain weather: Upsloping and Downsloping Thunderstorms: Single Cell, Multi-Cell, Squall Lines, Supercell MSC 243 Lecture #12 11/17/11
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Lake Effect Snow Formation
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Key ingredients for lake effect snow (where there is no synoptic forcing) 1. ‘Critical’ difference between lake temperature and 850mb temperature is 15C. 2. Small vertical wind shear ( <30o difference in wind direction and <10 kt difference in speed between 850mb-500mb). 3. Absence of dry air.
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Erie PA today NWS Cleveland discussion http:// Forecast soundings http://weather.niu.edu/machine/fcstsound.html NWS Graphical Forecast http://graphical.weather.gov/sectors/cle.php Regular COD website http://weather.cod.edu/forecast/ Lake Erie temperature http://www.coastwatch.msu.edu/erie/e2.html
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Wind Chill Wind Chill is based on the rate of heat loss from exposed skin caused by wind and cold. As the wind increases, it draws heat from the body, driving down skin temperature. Therefore, the wind makes it FEEL much colder. If the temperature is 0F and the wind is blowing at 15 mph, the wind chill is -19F. At this wind chill temperature, exposed skin can freeze in 30 minutes.
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Wind Chill
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Mountain Weather The complex terrain interacts with different atmospheric phenomena to produce interesting weather. These interactions can occur on very small scales (flow separation) and on very large scales (blocking west of Rockies).
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Mountain Weather This week’s UCAR educational module: http://meted.ucar.edu/mesoprim/mtnwave/index.htm Sections to watch: Scenario Overview (all subsections) Downslope Winds (slides 1-5) Concepts (Factors subsection)
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Upslope and Downslope Flow UPSLOPE DOWNSLOPE
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This note was uploaded on 01/08/2012 for the course MSC 243 taught by Professor Majumdar,s during the Fall '08 term at University of Miami.

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Lecture12_111711 - Mesoscale Weather Lake Effect Snow /...

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