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Discussion: Yr data source

in: tnipen; tnipen > 2017-02-19

Feb 21, 2017 5:31 PM # 
blairtrewin:
Congratulations on the WMO verification competition (which I found out about because you shared third place with a group of my colleagues in Australia).

I was wondering what source yr.no uses for its international forecasts - is it direct ECMWF model output or is there some kind of bias-correction mechanism? I'm currently in Geneva and the cold bias that I've noticed in yr.no forecasts for there in the past doesn't seem to be showing this time.
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Feb 21, 2017 9:20 PM # 
tnipen:
Nice, thanks :)

We don't do anything fancy outside Norway (except for a simple height correction for temperature). But I think what you are noticing is the fact that about a month ago we stopped running a 12 km nest of HIRLAM over Northern Europe (Geneva just made it into this domain). Instead, you are now getting raw ECMWF HRES, which probably explains the difference in bias (impressive that you picked up on this by the way...).

The change also means that our European users no longer get hourly forecast in the short-range (now it's three hourly), which generates a fair amount of complaints from our decently sized user base in the UK.

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