[wxqc] CWOP Information for CW4490 (C4490) in Leander, TX US

[Radiocatus]

I, too, have a Davis VP2, and obsessed for a while about variations in 
my readings from the MADIS analysis. I finally decided to use the 
pressure from KONT (Ontario International), about 10 miles away as an 
indicator since should be regularly serviced and calibrated. My VP2 
stays within about 0.2mb of KONT, although the MADIS analysis varies a 
bit due to the several PWS that are included in the analysis.  KPOC 
(Brackett Field) is only about a mile away, but it no longer reports 
temperature, humidity, or rainfall, the anemometer jumps directly from 0 
to 6mph (bad bearings?), and only reports during tower hours. I don't 
trust it.

I've concluded that my temperature and humidity/dewpoint variations are 
due to microclimate variations stemming from my proximity to a large 
reservoir (Puddingstone) about 1.5 miles from my location and upwind 
from me most of the time. MADIS has fits with that.

-Jay AS789

Victor Engel wrote:
> Please note that when I said I noticed a suspected variation in 
> pressure, I was referring to the difference between my reading and the 
> analysis, not a variation in pressure. I know there is a daily 
> fluctuation in pressure. Presumably it should be the same for everyone 
> in the vicinity.
>
> Also, just because a sensor is indoors doesn't mean that it's immune 
> to temperature variations. Such a notion presumes indoor temperature 
> is constant. Over the past 6 months or so my indoor temperature has 
> varied from about 46 to 86. I allow indoor temperature to vary for 
> economical reasons.
>
> Anyway, I haven't confirmed the effect I described. It might not even 
> be there. What I seem to notice, though, is that my readings are more 
> likely to be lower than the analysis during warm weather than during 
> cold weather. The difference is slight, since my QC tends to hover 
> between 98% and 100% for barometer.