Isentropic Structure From Model Simulations

 Northern Hemisphere Analyses

    The following images and animations illustrate the evolution of isentropic structure over the Northern Hemisphere during the five day period December 15-19, 1992. The images were made from data written at six hourly intervals from a global simulation by the UW isentropic - sigma coordinate model.
 
    The first set of images and animations portray various fields superimposed on the pressure topography (exaggerated) of several isentropic surfaces. The distributions are being viewed from the south along 30 degrees west longitude.
 

                    1.  Deviation from the 292 K zonally average pressure superimposed on the 292 K surface
                                        Red (blue) represents regions of low (high) pressure relative to the zonal mean.

                                                                                                    12z December 19, 1992   (45 Kb jpg)

                                                                                                     5 day FLI animation    (900 Kb)

                 2.  Mean Sea Level Pressure superimposed on the 292 K surface
                                         Red (blue) represents regions of relatively low (high) mean sea level pressure.

                                                                                                       12z December 19, 1992    (45 Kb jpg)