Click on a point to get a geostrophic vorticity tendency diagnostic :
It will take a few seconds to generate the map
NCEP-GFS Amérique du Nord Forecast Time: 19h30
Geostrophic Vorticity in black (interval 2X10-5 sec-1).
Geostrophic Vorticity Tendency in red (interval 1X10-9 sec-2)