Perhaps someone can help me understand the CL process a bit better. The Air unit’s barometric pressure graph is shown below and this unit was placed in service on 1/19/19. So it’s been in service about 2 weeks.
The behavior I notice is that often the Air’s barometric pressure is in line with my Davis VP2, but then for no apparent reason (see graph) will overshoot the mark and then gradually come back to a reasonably close value. This morning was a classic case. In the early morning my Davis was reading 30.42" and my Air was within .01" of that value. Then, within a 45 minute time period, the Air shoots up to 30.66", an increase of .25" (a very steep increase in meteorological terms, for that short a time period). Keep in mind that virtually all stations within my area (including my Davis) were either steady or saw an increase of .01-02" during that same time period.
Also keep in mind that no station, NWS or otherwise, had any pressure reading even close to 30.66. So I can’t see that the CL process was using other stations in my area as benchmarks.
So I can only assume that this behavior was somehow the CL process manifesting itself. But why after 2 weeks? If the correct pressure was being displayed on the Air for hours on end, why would the CL process increase the pressure .25" over the correct reading? It has since come back as I write this to 30.52, still .07" high and not the .01" it was prior to this ‘adjustment’. To me it looks like the CL process should have left well enough alone. At the very least it looks like there’s too much tinkering going on.
It actually makes me wonder if there’s some way to pull the ‘CL plug’ once you’ve got an accurate value for a parameter…assuming this odd behavior continues.