[wxqc] Barometer Accuracy and Standard Deviation of ASOS Stations?

[Steve Hatchett]

ASOS specs for barometers are 
Accuracy +/- 0.02 inHg (about .7 millibars)
Resolution measurement .003 inHg (about .1 millibars)
Resolution reporting .005 inHg

Don't know about standard deviation.

Steve

> -----Original Message-----
> From: Geoffrey Dick [mailto:wa4ikq at nevets.oau.org]
> Sent: Sunday, November 12, 2006 5:02 AM
> To: wxqc at lists.gladstonefamily.net
> Subject: [wxqc] Barometer Accuracy and Standard Deviation of ASOS
> Stations?
> 
> Does anybody on this list know the targeted, or expected accuracy
> for Barometric Pressure of ASOS calibrated stations?  Once calibrated,
> how much standard deviation is tolerated?
> 
> For several months, I have been tracking barometric pressure of 3
> airports that are within 12 miles of my location.  The stations
> are within a few meters in elevation of one another.
> Using the daily Gladstone summary, I see them wandering slowly,
> over several days, +/-0.8 millibars many times in opposite
> directions from one another.  Could temperature, weather station
> power supplies, or some other environmental component be a factor?
> 
> Geoffrey Dick
> WA4IKQ, AS140
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