Cold Waves

300 mb analyses for 19 to 28 February 2002: An animation of 300 mb maps illustrates the "channeling" effect east of the Rocky Mountains. Data courtesy of NCEP
850 mb temperatures for 19 to 28 February 2002: An animation of 850 mb temperatures show the movement of low-level cold air associated with the cold wave. Data courtesy of NCEP
Surface analyses for 19 to 28 February 2002: An animation of the surface pressure pattern and 1000-500mb thickness illustrates the migration of high pressure to lower latitudes. Data courtesy of NCEP