The result was that WXSIM was still too cool in this European warm spell. The forecasts for France were about a degree C too cool for lows and about 2-3 degrees too cool for highs. The English site was also too cool, by at least 3 degrees for lows and 1-2 degrees for highs. In summary, even after correcting for everything else, WXSIM was still about 2 degrees too cool. That's not awful, but it's more than I'd like, and other forecast sources generally did better (perhaps using persistence as a factor).I have found by directly manipulating correction factors (please don’t do this - it’s very hard to explain their behavior and you might make things worse), I can get very close to the right forecasts. There’s still some question as to why, for those using the pro version and the correction factors, wret may not have picked up on appropriate values of these factors. Some of it may be sample size and the fact that the really warm weather started very recently.
I’d be interested to hear how forecasts went lately for those actually using wret in this way on a regular basis
Hi Tom
As I announced at a treat at wxcompare mentioning to cold results for the nights
http://discourse.weather-watch.com/t/38580, we got something here with wxsim too cold forecasts
see http://www.weersverwachtingen.eu/clientraw/wd-ajax-ml/wxcompare_yr.php and http://www.weersverwachtingen.eu/clientraw/wd-ajax-ml/wxcompare.php
It’s not only the last period but as you can see it’s almost constant. Thought it was my station but forecasts for daytime are much better then nights. Living in W-Europe at the Netherlands (near Northsea between water, canals and Ijsselmeer lake 80 x 60 km wide) maybe it’s interesting for you to see my results.
thnx in advance