Long Range Forecasts: How Accurate?

Long Range Forecasts: How Accurate?

With all the advance in technology and increase in computer power, combined with an insatiable appetite for weather forecasts well into the future, the question arises as to how accurate are these now available specific prognostications weeks in advance.

In particular  AccuWeather.com now makes available for every city in the United States a specific 45 day forecast.  As an example following are the daily forecasts for Star Valley Ranch through the middle of February!

So the question is how do you use this forecast in planning ahead and can it be believed.?

Cliff Mass a professor of Meteorology at the University of Washington provides a very good perspective in his recent blog on the subject.

Meteorological Snake Oil Salesman:Ultra-Long Daily Forecasts