I have just made some modifications to my rain gauge increasing the resolution from 0.5mm to 0.1mm. I have tested and seem to record accuratly.
My problem is that for the last two morings I have recorded 0.1mm of dew. Should dew be recorded as rainfall? If not what do others do about this problem?
Geoff
http://www.rhumbline.com.au/weather
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Should dew be recorded as rainfall
- nitrx
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Re: Should dew be recorded as rainfall
According to the KNMI (Royal Dutch Meterotical Institute free translated) dew is percepation also snow hail etcetra Dew is measured as percipation and recorded as rain , I think the confusion comes from the word 'rain'.
- steve
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Re: Should dew be recorded as rainfall
In the UK at least, it counts to the total. For manual recording, if the observer knows that the precipitation was caused by dew, this is noted in the return.
Steve
- mcrossley
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Re: Should dew be recorded as rainfall
I also had a 0.1mm gauge which recorded dew. Cumulus counts this towards the total (a very minor contribution!), but made sure the 'rain day' threshold in Cumulus was set to 0.2mm so it was not counted as a rainy day if only 0.1mm was accumulated.
- logjam
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Re: Should dew be recorded as rainfall
That's a very good idea. I assume that is RainDayThreshold in Cumulus.ini. Mine is set to -1. Is it a matter of changing it to 0.2 or is it located elsewhere ?mcrossley wrote:I also had a 0.1mm gauge which recorded dew. Cumulus counts this towards the total (a very minor contribution!), but made sure the 'rain day' threshold in Cumulus was set to 0.2mm so it was not counted as a rainy day if only 0.1mm was accumulated.
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Re: Should dew be recorded as rainfall
There isn't a config screen for it, so you can only changing it by stopping Cumulus and editing cumulus.ini. But note that the default value of -1 corresponds to 0.2mm anyway.
Steve
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Re: Should dew be recorded as rainfall
Thanks everyone, especially Mark. Your suggestion solves my problem.
Geoff
Geoff