On Mon, 16 Mar 2009, Patrice Scattolin wrote:

Hi Patrice,

Of course the score of the new model shows some improvement with weather
systems mainly over the pacific and atlantic regions as well the arctic.
The old radiation package had a known cold bias and the new CCMRAD
radiation does improve temperature and wind forecasts. When we talk about
radiation, it includes moisture and cloud as well where new physics are
now used in the model. In other words, the cloud cover schemes code is
brand new and we have to assure it is at least as good as the old one.

The new radiation model opens the door to assimilate new type of data from
orbiting satellite which was impossible in the old radiation. Since
satellite data represent 95% of the data over the oceans, this is the
reason why we see better scores over both oceans, thus over eastern and
western provinces/states.

Improving the model, like increasing the horizontal resolution will have
an impact on clouds and sometimes we have to rewrite or validade some
physic codes including the cloud.

Hope this help....

Allan


>
> Ok, I'll bite, if nothing has changed, what has improved? I am guessing
> that the model is more accurate over longer periods, since the
> Environment Canada web forecast is now 7 days long.
>
> If that's the case can we hope to have the CSC getting a 3rd day of
> forecast?
>
>
> allan_rahill wrote:
> >
> > Hi,
> >
> > Thursday 12th, we implemented a new GEM regional weather model with a
> > new grid extending a bit further north and south (thus bigger) but it
> > has no impact with the astro-weather production as you can judge from
> > the Clear sky charts. I double checked yesterday and this morning and
> > all images are identical to the old one.
> > <http://www.cleardarksky.com/csk>
> >
> >
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

                                     *               *
                                                         _~~~~~~~
Allan Rahill                             *     *      *(     )
                                                    ~~-(__   )
Centre meteorologique Canadien                  * (____ CMC )
Canadian Meteorological Center, Dorval, Canada     (_______)
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ASTRO-METEO-WEATHER                                   '''
http://weatheroffice.ec.gc.ca/astro/index_f.html    '''
Attilla web page
http://www.cleardarksky.com/csk