Richard Dixon wrote:

On Dec 22, 10:44*am, "Norman" wrote:

Even if only model "performance" is considered you have to define what you
mean by that before you can make any proper comparison.

Here's one - 500mb anomaly correlation

http://www.emc.ncep.noaa.gov/gmb/STATS/html/acz5.html

Even then, it would be good to see how this statistics vary by weather
"type" - westerly, blocked etc.

Richard

These statistics, of course, are averages covering whole hemispheres. Regional
errors may well cancel each other out. The period shown covers Fri 16th Dec. At
T-5 all the models were predicting a very intense low passing across northern
Scotland on that day, as I'm sure most people in here remember. In the event,
of course, we know that it didn't happen. It was a hugely significant error for
our particular bit of the planet but there isn't a hint of a blip on the
hemispheric 500 mb anomaly statistics.

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.