Question about example forcing attributes file

[cbachand]

Hi, I have a few questions about the forcing attributes file here: https://github.com/NASA-LIS/LISF/blob/master/lis/configs/557WW-7.3-FOC/attribs/forcing_attribs.txt (These might be silly questions, sorry!)

First, why is the upper limit on precipitation set so high? Isn't 1 mm/s unrealistic?
Second, why can incident longwave radiation be negative? Isn't that just the downward radiation?

Thanks!
Claire