[wxqc] Rain gauge data

Wed Oct 5 22:04:11 EDT 2005

Rick,

I would also strongly recommend a MANUAL calibration of the Davis 
instrument. Do not adjust knobs for the sake of adjusting them. Using 
the manual/standard guage, take a known quantity of water (say 1") and 
then pour it slowly through the Davis (while it's offline from your 
logging mechanisms). Make sure an inch is registered. Then I would 
take another 1.00" of measured liquid from the other guage and dump it 
more quickly through the gage (fast enough to similuate a 
moderate/heavy rainfall but not an earth shattering deluge). Note any 
differences. Calibrate the instrument as needed that way.

If the instrument is flawed, then you should ideally not receive an 
inch of rainfall when pouring the water slowly through the Davis 
opening.

Evan
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I have a 4" rain gauge and my Davis Vantage Pro2 ISS located
near each other.  The 4" gauge is property of NWS as I'm
an observer.  My Davis never agrees with the other one.  It
always registers less.  I understand that's normal for a
 "tipping bucket" instrument.

Is there a formula that can be applied to the Davis readings
to correct the difference?  Is there anyway the data can be
made accurate to use?

Thanxx
Rick Schwartz
CW3768
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<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D2>I have a 4" rain =
gauge and my=20
Davis Vantage Pro2 ISS located</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D2>near each =
other.&nbsp; The 4"=20
gauge is property of NWS as I'm</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D2>an observer.&nbsp; My =
Davis never=20
agrees with the other one.&nbsp; It</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D2>always registers =
less.&nbsp; I=20
understand that's normal for a</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D2>&nbsp;"tipping =
bucket"=20
instrument.</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" =
size=3D2></FONT></STRONG>&nbsp;</DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D2>Is there a formula =
that can be=20
applied to the Davis readings</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D2>to correct the =
difference?&nbsp;=20
Is there anyway the data can be</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D2>made accurate to=20
use?</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" =
size=3D2></FONT></STRONG>&nbsp;</DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" =
size=3D2>Thanxx</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS" size=3D2>Rick=20
Schwartz</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3D"Comic Sans MS"=20
size=3D2>CW3768</FONT></STRONG></DIV></BODY></HTML>

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