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Long-Range U.S. Forecasts / Re: La Nina - Climate Change
« Last post by Mattk on Today at 05:13:50 AM »
What a rubbish statement that is

You need to expand that, otherwise nobody has any real clue what you mean or trying to say, vagueness is the failure of such pretences
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Weather Station Pictures / Re: Davis VP2 Plus FARS in Cochranville, PA
« Last post by ocala on Today at 04:51:45 AM »
Looks good but just curious what the crossbars are for. Aesthetic?
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Long-Range U.S. Forecasts / Re: La Nina - Climate Change
« Last post by waiukuweather on Today at 04:48:00 AM »
What a rubbish statement that is
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Weather Station Pictures / Re: Davis VP2 Plus FARS in Cochranville, PA
« Last post by alexstaar on Today at 01:44:19 AM »
Do you report to CWOP or WU?
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Sorry to resurrect this thread but I am finding similar inaccuracy with my WH2910c - point taken that the UV is merely calculated instead of measured but it's so far off that it seems pointless to include.

Here is a comparison of the official data for Melbourne Australia (arpansa.gov.au) with my readings, on two random days (figures rounded):

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Ignoring obvious cloud cover, there is a big discrepancy with the Ecowitt reading much higher. I don't think a correction factor will quite do it - at times it is 2/3 and at other times double.
It is a pretty important measure, at least in Australia where the UV can reach 10-12 due to the Ozone hole  :sad:
I'd definitely buy a separate sensor if it was available.
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unplug all the "phone jacks" on your station. No data will be sent to the console.
Ahh ok that makes sense, didn't think about that. Thanks

Sent from my SM-G955U using Tapatalk

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unplug all the "phone jacks" on your station. No data will be sent to the console.
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Next update:While I know the WS80 lux sensor does not have a dedicated UV-only sensor, I wanted to check and the sensitivity of it to UV light. This is to gain a little insight on the potential impact of variations in UV light over throughout day/seasons.

I performed two UV tests, one at night and one during the day to assess how the WS80 lux sensor responds. For both tests, I used a 3W 395nm UV LED light approximately 1" away from the sensor. The light was held in place for 2 minutes to ensure a full period of data was recorded (although from my previous posts I know only the peak value is reported by the WS80/GW1000).

Results: Since the WS80 lux sensor is designed to match the photopic curve (human vision / CIE 1931), we expect the impact of ultraviolet light to be minimized in its readings. The sensor's spectral response does include some UV light, as shown in the Night Test. However, in the Day Test just holding the LED light over the sensor blocked more ambient sunlight (despite being a cloudy day) than it contributed in the UV spectrum.

Overall, what this demonstrates is that UV spectral response is not heavily weighted by the WS80 lux sensor. So while there will be some daytime/seasonal shifts in accuracy due to different amounts of UV light, it should not skew the lux readings heavily.

Side Note: I didn't do a w/m2 graph because that would need me to convert/redownload and match up the data all over again versus using DLI or fc like I've already been doing. Not that it isn't impossible, just a lot of work for pretty much the same conclusion.

Further Reference: I've included two excerpts detailing the variations in UV light throughout the day and seasons below. The readings were taken by Q-Lab in Cleveland, which does accelerated weather and corrosion testing. I don't know how good this lab is, but I have done accelerated aging studies and test evaluations for my work (which is a very complex and interesting specialty subject). Full reading here: https://www.q-lab.com/documents/public/cd131122-c252-4142-86ce-5ba366a12759.pdf

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I'm talking about the RWR product, I wanna see what people found that is rare to find in their area or anywhere. Like what I found!

And not just weather conditions either.
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Oh, I see.

Not "round-up" related, but once at work a message came across the FIDO (data printer) that said a tornado had "sucked a pond dry" that was next to an airport. True story.
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