[wxqc] Re: Sea Level Pressure

[dshelms at comcast.net]

I'm guessing about 25-30% of CWOP members use Davis.

Dave
CW0351


> I don't have any idea, we don't keep track of what kinds of stations people
> have.  Unfortunately, the Vantage Pro is quite popular so I bet there will
> be more than I'd like in this category!
> 
> Mike
> 
> On Tue, 6 Sep 2005, John Webb wrote:
> 
> > Thanks Mike. Do you have any idea what percentage of APRSWXNET stations have 
> > Davis equipment, and therefore are affected?
> >
> > John Webb
> > C3212
> >
> > At 12:01 PM 9/6/2005, you wrote:
> >> John,
> >> 
> >> Sorry I didn't reply sooner...
> >> 
> >> I'm afraid the QC processing doesn't have the ability to take into account
> >> that some APRSWXNET stations are reporting SLP instead of altimeter.  I 
> >> suggest
> >> you contact Davis about fixing this -- the APRSWXNET protocol requires
> >> altimeter.  In the meantime, you should ignore the QC results.
> >> 
> >> Mike
> >> 
> >> On Fri, 2 Sep 2005, John Webb wrote:
> >> 
> >> > Can anyone comment on 
> >> this?................................................
> >> >
> >> > --------------------------------------------------------------------
> >> > The Davis Vantage Pro II reports using sea level pressure reduction 
> >> algorithm
> >> > (elevation AND temperature corrections). I have noticed that QC takes 
> >> this
> >> > and then corrects it again for temperature. This causes barometer QC for
> >> > Vantage stations to fluctuate significantly, especially after cold 
> >> fronts.
> >> > Can this be programmed in QC? Fact is that Davis Vantage stations do not
> >> > report altimeter pressure.
> >> >
> >
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