SNOINCR 3/10/11 is 3” in the last hour and then I forget if the coding back then was 10” in the past 6hrs or 10” for the storm. And then I think the 11” is the current depth.
SLP is in every ob in tenths of a mb. So SLP875 is 987.5mb. I think anything coded as 500+ gets a 9 in front of it (low pressure) and anything sub 500 gets a 10 (high pressure).