A Madis station from USA shown in Southern Pacific
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I noticed in my navigation area measured values not corresponding to observations from
Madis station
GW3376 Litchfield
S39°2'28" W89°41'32"
According this page, it is located in Litchfield, IL, US 39° 11' 0" S 89° 39' 0" W elev 690m.Is this a glitch in the source of data or a persisting parsing error of it? Or a bug in the batch file?
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@Canne said in A Madis station from USA shown in Southern Pacific:
Litchfield, IL, US 39° 11' 0" S
Illinois, USA is not in the South hemisphere!
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@Gkikas-LGPZ Thank you. You summarized the meaning of title of this post: there are other of these (solid ground) "Madis" stations floating in Windy.
An anticipated sign of the climate change effects, perhaps? With a bit of searching, one can find, for example:
Ferrières-sur-Sichon (pop. 552) has set the sails and is now called Ferrières-sur-Mer:
Not dramatic but a batch run by Windy to block this noise would we welcome.
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I know that somebody is working on this (?) - on a stormy day at sea one can easily find more of these lost landlubber "Mad"iis stations, being probably terrified:
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@Canne
You are right. There is a lot of personal weather stations, identified as madis or pws, which are misplaced. And as you show in your screenshot, you can find them at sea !
This the reason why I don’t tick the pws stations since now you can choose which category you want to use. Furthermore even for those correctly positioned many display crazy wind speed values.
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@idefix37 Thank you very much! I did as you suggested to reduce the noise.
I can see the interest of PWSs, like in cruising and probably in some mountain sports, but Windy should not accept them for public display without some initial and periodical verification, which can be simply by comparing the measurements to the model's values in the advertised position.
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@Canne
It seems difficult for Windy to make a verification on each personal weather station against weather models when the station comes online. And for example in the mountains this is impossible, because the model forecasts are not reliable. Due to their resolution they cannot take into account the real altitude of the station.
Then I guess the madis personal stations are downloaded as a whole file computed by NOAA. Difficult to sort them. -
@idefix37 You are absolutely right - after reading about MADIS, ingesting data from NOAA data sources and non-NOAA providers for delivery, I can understand that once the bad quality goes in, the bad quality also goes out to the "Meteorological Community", as they put it. Luckily, most of the distributed data does not fall into this category.
I will be more careful now, and filter out the PWS data which is often useless noise, unfortunately, and will also look with a certain questioning to some other stations as well, like those coming from ships. And keep my own boat's sensors well calibrated, allowing me to assess the models vs. the real weather situation, which is the purpose why I were looking at the stations around me in the first place.
Thank you for your insight.
