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Comparing Acu-Rite 01015 to NWS Standard Rain Gauge

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wxtech:
I just had a heavy rain 3:35pm - 3:55pm 110820.  I measured the accumulation in the National Weather Service standard rain gauge and compared it to the Acu-Rite 01015 and to the Davis VP2+ with a Waterlog H-340 tipping bucket gauge.
NWS SRG =0.35"
Acu-Rite = 0.35"
Davis VP2 = 0.33"
CoCoRaHS = 0.35" (4" plastic pro gauge)
I will make a correction on the Davis VP2 because that feeds the web site and the station annual totals.
http://www.lexingtonwx.com/

Rhino:
Results look good! We are finding some folks are having rain inaccuracies, but after some investigation we found that it was mostly due to mounting- if the unit moves in the wind too much it will register rain due to the measuring bucket being tipped.

By the way, just curious-did you need to calibrate the 01010 rain gauge at all?

jeeptj5:
We had a rain event here in the Chicago area today and my (1050c) display unit logged .45 inch of rain.  My web site reading was .34 inch of rain for the same period.  The connection to the server was good the whole time and the signal strength to the bridge and the display unit is full bars.  Any thoughts on the discrepancy???

Rhino:
I have seen discrepencies like this from 2 identical rain gauges placed mere feet apart many many times, i would say in general it is well within the (real world) margin of errors for most rain gauges. You could run some tests and calibrate the 5n1 rain. Gauge though...

George Richardson:
Rhino,
What jeeptj5 stated amounted to a 33% error which I seriously doubt would be "
well within the (real world) margin of errors for most rain gauges.".

George

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