My barometer readings fail MADIS and CWOP (
http://weather.gladstonefamily.net/site/C6998 [Corrected]). I am not sure if I am calibrating correctly.
Can someone point me to simple step-by-step instructions to calibrate my reading? Else, offer steps.
Here’s what I’ve done, but, again, not sure if this is correct and in either case I still get bad readings reported:
1. Get readings from three nearby locations (within 30 miles and all at different altitudes)
2. Take sea-level reading from each, calculate the difference (0.000838 for each foot of elevation change)
3. Adjust my reading to reflect the average (and often matching) reading calculated for my altitude. In making this adjustment, I enter the change directly on the WMR-968.
What is wrong? Why do MADIS and CWOP continue to fail? Am I doing the calculation correctly? Am I making the change correctly? How often should I have to recheck and update my calibration?