There are several data sites that serve up doppler radar images every 6-10 minutes. In addition we have correlating satellite, lightning and weather data. We also have historical radar imaging for missed downloads.
High Level Architecture
There are several radar sites across canada that provide individual and combined images at 10 and 6 minute intervals.
480 x 560 with legend - active area is 480 x 480
xam is a good example
Out of order image ordering (historical)
Transient blocking from wind farms
Transient blocking from RF interference
Permanent false positive elements
single frame noise
Image gitter at 1 pixel
Noise past circular range rings
Historical radar missing data due to grid/names overlay