Hi Pasha,
It appears to me that the pressure values on locations below sealevel are not right.
I have some locations around me installed in YoWindow.
Some of them are about 4 meters below sealevel, some are up untill 6 meters above sealevel.
In total that's a difference of 10 meters (-4 to +6).
If I'm right the difference between these two should be no more then 1,25 hPa.
The present average pressure for all of Holland is 1025 hPa.
Leiden (above sealevel) shows 1024 hPa. So that one is looking good.
Schiphol (below sealevel) shows 994 hPa. That's a difference of 30 hPa!. That difference is good for 240 meter.
I was wondering if there's something wrong in the calculation when the location's hight is negative.
Thank you.
Fred