Choose the start and end dates and times for the loop. [Format mm/dd/yyyy hh:00 GMT]
Surface: 1/1/2008 0:00 GMT through 11/3/2009 18:00 500 mb: 1/1/2008 0:00 GMT through 11/3/2009 18:00 850 mb: 1/1/2008 0:00 GMT through 11/3/2009 18:00 Tropopause: 1/1/2008 0:00 GMT through 11/3/2009 18:00