Thanks to NOAA and the SSEC in Wisconsin for the charts.
and thanks to Offnuts at GIMP forums for the shell script:
“Resulting GIF is going to be huge (120K/Frame, 365 frames…) “
one day each per chart and one years worth of charts is about the minimum I could expect to offer and get my point across with those things.
The oceans get noticeably warmer in our summer. The ITCZ does more than move up and down with the seasons. Look at June, things get frantic then.