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WINTER WEATHER (PowerPoint download) by yurtgc548

VIEWS: 6 PAGES: 18

									             WINTER WEATHER
• Freezing rain
  – Dangerous
  – Costly
  – Potentially deadly
     •   http://www.usatoday.com/weather/news/2000/wice1228.htm
     •   http://www.usatoday.com/weather/wice98.htm


  – Special “subset” of overrunning
     • Shallow layer of sub-freezing air along the ground
WINTER WEATHER
WINTER WEATHER
WINTER WEATHER
WINTER WEATHER
WINTER WEATHER … ice ice baby

                   Ice zone ……

                    850 mb T’s ….
                    -> * -1 to +5

                    1000-500mb THK
                    -> * 540 – 552dm

                    * Depends on
                    nature of cold
                    air north of
                    warm front
        WINTER WEATHER
• Precipitation type
  – Depends on the thermal profile!
WINTER WEATHER




    R   F   P   S
    N   Z   L   N
        R
        A
WINTER WEATHER




    ICE PELLET SOUNDING
WINTER WEATHER




   FREEZING RAIN SOUNDING
WINTER WEATHER




    Sounding type?
WINTER WEATHER




    Sounding type?
WINTER WEATHER




    Sounding type?
“COLD AIR DAMMING”
                 COLD HIGH
                 PRESSURE
             H   SYSTEM …
                 air circulates
                 clockwise
                 around the high




                  CREST OF
                 APPALACHIAN
                  MOUNTAINS
    COLD AIR DAMMING
WARM AIR
ASCENDING
COLD AIR




     COLD AIR
     DRIVEN
     SOUTH
PRECIPITATION AROUND CYCLONE: WINTER
       DURING COLD AIR DAMMING




                              More places
                              receive icy
                              precipitation
                              due to COLD
                              AIR DAMMING
Special Case: Valleys of the West
FREEZING RAIN EVENTS CLIMATOLOGY

								
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