Lecture11_111011

Lecture11_111011 - WINTER AND MOUNTAIN WEATHER Winter...

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Unformatted text preview: WINTER AND MOUNTAIN WEATHER Winter Storms Winter Storm Reconnaissance Precipitation Type Lake Effect Snow Wind Chill Upsloping and Downsloping MSC 243 Lecture #11 11/10/11 Winter Storm Frequency (JFM) Typical storm tracks in the USA: http://wxprediction.com/storm_track2_files/slide0001.htm Winter Storm Reconnaissance Winter storm formation: Ingredients Favorable jet stream position aloft. Cold polar air coming from north. Sharp temperature gradient. Availability of moisture. Norwegian Cyclone Model Initial frontal boundary separating cold and warm air. A wave forms along the front as an upper-air disturbance in the jet stream moves over it. Front develops a kink where wave develops. Isotherms Isobars Precipitation Type Precipitation type depends on the critical thickness and freezing level . Critical Thickness Contour The dashed blue line is the 540 decameter thickness line. As a general rule of thumb: expect the precipitation type north of this line to be frozen. http://weather.rap.ucar.edu/model/displayMod.php?var=gfs_sfc_mslp&loop=1 RED : 1000- 700mb = 2840m CYAN : 850- 700mb = 1540m YELLOW : 1000-850mb = 1300m PURPLE : 700-500mb = 2560m GREEN : 850-500mb = 4100m WHITE : 1000-500mb = 5400m BLUE : 850mb 0C Isotherm http://lukemweather.blogspot.com/2010/11/closer-look- Snow and Rain Snow and rain are generally the easiest to predict....
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Lecture11_111011 - WINTER AND MOUNTAIN WEATHER Winter...

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