WXforum.net
Weather Software => Cumulus => Topic started by: mkutche on February 25, 2023, 02:12:19 PM
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I had to get a new rain gauge and when it tips it reads 0.04" per tip unlike my other one was 0.01" per tip what would the rainfall offset be? I'm not good at math lol
Thanks
Mike
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bump
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It is not an offset (as such) but a factor, factor of 4 (400%)
Strange capacity @ 0.04" per tip? So 25 tips to the inch
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Strange capacity @ 0.04" per tip? So 25 tips to the inch
Basically it's metric, 1mm. I've seen cheaper stations like Oregon Scientific that use that resolution rain gauge.
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So mm to inches you divide by 25.4 = 0.03937
1 mm is a big tip size though!
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would that be the multiplier?
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would that be the multiplier?
Yes, For every tip is 0.04" (1.016mm) for a system expecting 0.01" (0.254mm) so multiple *4, note the mm converson is not exactly 1mm but probably well within design spec. Does your system have an option to set a 1mm gauge?
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would that be the multiplier?
Yes, For every tip is 0.04" (1.016mm) for a system expecting 0.01" (0.254mm) so multiple *4, note the mm converson is not exactly 1mm but probably well within design spec. Does your system have an option to set a 1mm gauge?
i don't see it in the settings anywhere sadly
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would that be the multiplier?
Yes, For every tip is 0.04" (1.016mm) for a system expecting 0.01" (0.254mm) so multiple *4, note the mm converson is not exactly 1mm but probably well within design spec. Does your system have an option to set a 1mm gauge?
i don't see it in the settings anywhere sadly
see image https://prnt.sc/7H_LHrI9sCGw (https://prnt.sc/7H_LHrI9sCGw)
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1 mm is a big tip size though!
Yes it is. However the purpose of the metric system is to keep things in even multiples of 10, other fractions confuse the matter, and 0.1mm (100µm or 0.004") is getting a little impractical to measure with a regular tipping rain gauge, so therefore you're stuck with one millimeter.
](*,) (emoticon of a metric system user banging his head against a ruler measured in fractions of inches)
:grin:
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EDITED: I misread your original post as having an original tip size of 0.001 inches!
I don't think so You don't say which station you have. But if the station is expecting 0.01 in per tip, but it is now registering 1 mm per tip (are you *really* sure it is 1 mm, not 0.1 mm?), Then ideally you need to do the correction in the station itself. Or at least some of the correction.
If all the correction is being done in CMX, then the multiplier would be 3.937008.
In this part of the world a 1mm per tip sensor would not register any rain on many days it rained less than 1 mm.
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I don't think so You don't say which station you have. But if the station is expecting 0.001 in per tip, but it is now registering 1 mm per tip (are you *really* sure it is 1 mm, not 0.1 mm?), Then ideally you need to do the correction in the station itself. Or at least some of the correction.
If all the correction is being done in CMX, then the multiplier would be 39.37008.
That is the new tipper is almost 40x less sensitive than the one you had before!
In this part of the world a 1mm per tip sensor would not register any rain on many days it rained less than 1 mm.
WS-2080
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OK, if it is using the usual OS rain gauge then I believe it is actually 0.04 inches per tip not 1 mm.
So, the multiplier should be 4.0 exactly (as posted above by @Mattk)
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OK, if it is using the usual OS rain gauge then I believe it is actually 0.04 inches per tip not 1 mm.
So, does that mean if you get 0.03" of rain, nothing is displayed, and then rain is displayed in only 0.04" increments after that? :???:
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OK, if it is using the usual OS rain gauge then I believe it is actually 0.04 inches per tip not 1 mm.
So, does that mean if you get 0.03" of rain, nothing is displayed, and then rain is displayed in only 0.04" increments after that? :???:
Yes.
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Wow. Never knew that. No bueno IMO. Thank you.
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OK, if it is using the usual OS rain gauge then I believe it is actually 0.04 inches per tip not 1 mm.
So, the multiplier should be 4.0 exactly.
Even the Davis rain gauge is nowhere that accurate. I believe stations like OS are made to switch between metric and English units with no change in the rain gauge. As mentioned the difference between 1 mm and .04" is most likely well within specs and the inherent accuracy of the gauge.
So yes, a multiplier of four, or 3.937 really isn't going to make a significant difference. I would go with the higher, because even assuming it's accurate, it's going to be reporting up to .04" low on any storm to begin with.