North Polar UVTZ Animations at 3 Pressure Levels

Northern Hemisphere Polar Winter UVZT Animations

The data used are the daily stratospheric analyses from UK Met office ("UKMO", now "MetO") by way of the British Atmospheric Data Centre (BADC).
North polar stereographic projections are shown (but with linear latitude spacing). The scales are fixed for each parameter/level over the duration of the animation as given at the bottom of each contour plot. That is the contour step is (max-min)/12, since there are 12 colour levels, increasing as grey to red-brown. These were chosen to show the most detail in mid winter (consequently fall and spring exhibit less detail). In the case of U,V the scales have been modified slightly so there is an exact zero contour (as shown by tiny legend off the bottom right "corner" of the plot). The Z parameter is geopotential height minus "nominal height" [ The nominal height is calculated as (64.8/4) x (3. - log10 Pmb) Km.] Greenwich Meridian (zero longitude) is at the bottom, as is the low latitude limit. Available disc space is too limited to allow more than 3 or 4 winters to be shown.
On Jan 5 2016 the UKMO/MetO stratospheric assimilated data set ceased to be updated (it is now, on Mar 10, available to Feb 20). In the meantime I have switched to the Met. Service Canada forecast model. It has the advantage of being right up to date, but the maximum height is only 50hPa (~20Km), and this is the only height I will show. At some point I may make an animation. but for now just the most recent day will be shown. We will return to UKMO shortly.
Winter 1991/92 Winter 1992/93 Winter 1993/94 Winter 1994/95 Winter 1995/96 Winter 1996/97 Winter 1997/98 Winter 1998/99 Winter 1999/00
Winter 2000/01 Winter 2001/02 Winter 2002/03 Winter 2003/04 Winter 2004/05 Winter 2005/06 Winter 2006/07 Winter 2007/08 Winter 2008/09
Winter 2009/10 Winter 2010/11 Winter 2011/12 Winter 2012/13 Winter 2013/14 Winter 2014/15 Winter 2015/16 Winter 2016/17 Winter 2017/18

Most recent winter day

(Our go-to program for controlled viewing of the gif89a animations is "gif movie gear". )