Hi! New to the forum.

I have a WS2902 for 2 years now. Really like all the information, but I have just gotten around to learning more. I did some searching on this site to find the answer to my questions but didnt get to far.

My question is about the "Rate of Change of Pressure Graph." From the Users Guide I understand the it reads " The difference between the daily average pressure and the 30 day average (in hPa)." HPa is HectoPascals so Pascals * 100. Ok, just scaling the pressure, and 30 day average pressure is fairly simple as is daily average pressure. If I am reading it right, and the gauge shows, say, -1 then the daily average pressure (of today) is 1 hPa lower than the average of the last 30 days. please correct me if that is incorrect.

Next question then, Is what does that tell me? I think that if pressure is dropping (on a short term basis) then storms may be approaching, and if it is rising, should be better weather. I dont understand how looking at the averages would be a lot of help.

any thoughts?Thanks!