Well this directory is in memory. So after a certain amount of observations the Raspberry runs out of memory. I had written in step 5 to change the script and just remove the files. In the comments there was also a suggestion to change the script and create the directory if it is missing. See Howto: Meteor M2 weather satellite image decoding - #63 by michal.drzal
The log file you posted, showed no problem with the directory but with the amount of packages decoded being 0. I guess you had several setbacks.
Nice to hear that you have mastered it and it starts to work for you! Enjoy! 
Best regards, Eelke