Interesting. I know GOES satellites publish Xflux every minute. Currently, my app probes this data every 5 minutes, but I could easily change that to every minute. That would represent a download of 25.7 kB every minute; so about 1.5 MB an hour.
I never realised this data could be that time critical on a difficult mountain top. I will change my code accordingly and let you know when I did.