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netweather.tv
 Poster: A snowHead
Poster: A snowHead

Seriously, why do they bother. The site is saying right now moderate/heavy snow today.

If it can't be even close at the actual time how on earth do they think we'll believe their 10 day forecast???
snow conditions
snow conditions
 Obviously A snowHead isn't a real person
Obviously A snowHead isn't a real person

I just posted this in the general weather thread:

Indeed it [Netweather, rubbish] has. Same goes for most of the public medium and long range computer generated weather forecasts. Most use the GFS data which is readily available for free. Nothing wrong with that, but...

<lecture>
Numerical weather models operate by breaking the area they cover into regions. This is done to make it possible to compute forecasts in a timely fashion. In the case of the GFS, these regions are 35kmx35km square for the first 192 hours. This is known as the resolution of the model, and everywhere "within" that is projected to have the same atmospheric conditions.

Netweather and similar sites try to choose the nearest GFS grid point to the actual place the forecast is being generated for. So for any given place this could be roughly 17km longitude and latitude out.

On top of that, the mountains themselves greatly influence the weather. A 6km grid means that a lot of localised terrain is averaged (eg. 4000m peak, 600m valley = 1500m height for that 35 square kilometers)

Couple that with the fact that precipitation is one of the hardest things to forecast and you can understand why the forecasts driven by global weather models are somewhat unreliable, especially for marginal events where a front just "brushes" a region.

For better local predictions, we have mesoscale models which operate at a much higher resolution. These produce much better output, but because they're extremely CPU intensive to calculate are usually only run out to a maximum of 72 hours. Good examples that are freely viewable are COAMPS and WRF NMM (see meteociel.fr)
</lecture>
snow report
snow report



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