Hello Stephan,
I am still not sure why you think your station was reading 100km/h. I 
wonder if the following could explain the discrepancy...

If that speed came from official weather reports, then their standard (in 
many countries) requires that they are measured in open flat areas with the 
anemometer 10m above ground level.  Wind speed decreases as you get closer 
to the ground.

Also, the presence of buildings, trees and so on, creates a much more 
turbulent flow. The wind can have as much energy but lower measured speeds 
are recorded since vertical components are not normally measured by home 
instruments.


Cameron.


On Thursday, 5 March 2020 03:32:24 UTC+10, Stefan Pachlina wrote:
>
> Hello,
>
> feb 24 2020, it was a stormy day in austria ... but most weatherstations 
> (weewx-map, wunderground-map) show windspeed like 64kph.
> but on this day wind speed was ~103kph
> i have the same problem with my weather-site. 
> http://wetter.pachlina.net/
>
> *i configured weewx.config to see kph:*
> [[[[Groups]]]]
>   ....
>   group_speed = km_per_hour
>   group_speed2 = km_per_hour2
>   ....
>
> but what i see are miles and not kph.
> cause if i multiplicate the wind-speed with 1,61 i get the right 
> wind-speed of 103 kph
>
> so what is to do to get the right values?
> is there something more to do?
> i read the manual again and again, but i cant find the solution to see 
> right wind speed.
> all other values are ok .. like temperature in celsius.
>
> and this is what i see on many many weatherstation around austria, germany 
> .... with weewx-map, wunderground, ...
>
> hmmmm any idea?
> thx
>
> Stefan
>
>

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