[wxqc] Re: Sea Level Pressure

[John Webb]

If all of your pressure data is being flagged by QC, make sure your 
elevation is set correctly in your software. If that isn't the problem, 
make a calibration (in the software) using reliable stations nearby as 
references. I waited for a broad area of high pressure and looked at all 
stations within a 20 mile radius, which got me to within .02Hg of everyone 
else. The problem with VP2 is that the next time a much cooler or warmer 
air mass arrives, your readings will fluctuate with QC. Once you watch this 
happen a few times, you can recalibrate to an average setting that usually 
will pass QC. That's the best we (Davis station users) can do until there 
is a software fix on one end or the other that will convert SLP to Altimeter.

John Webb
C3212

At 12:02 PM 9/7/2005, you wrote:
>I also have a VP2 using VWS.  I've been getting 97 of 97 errors on my QC 
>report. Doesn't this mean that the pressure data that we VP2 users paid 
>big bucks to collect is also being ignored by NOAA MADIS?
>
>I'm sure the VWS can provide both corrected and uncorrected data. If it's 
>putting the wrong data into the packet then that needs to be addressed 
>with the Author of VWS.
>
>I'm a little unsure of what the problem with the data is.  Are you saying 
>that VP2 does Temperature & Humidity compensation on the raw Pressure data 
>prior to sending it to the Data logger, or is it something else?