Why are forecasts not always correct?

Answer 1

I don't know but I trust you will tell us once you find out.

Answer 2

If you are speaking of weather forecasts the answer is simple;
there are too many unknown variables. That being said, you
must first qualify where you are making the forecast for, what time of year, and in some instances what time of day.
For example, without any instruments at all I can make an extremely accurate forecast for the weather in In Salah, Algeria
in the month of July. High 114F low 103F no precipitation, no humidity. For that climate and that time of year, there are not too many variables--no change. But in most of the world, the number of factors which influence the weather such as humidity, warm ocean currents , evaporation rates , and turbulence in the upper atmosphere just to name a few are to numerous to accurately assess. Meteorologists design models which account for as many of these variables as they
can with some sort of accuracy, and their models are imminently better than they used to be. But there are still too many unknowns and the interactions are too complex to make more accurate predictions.
Also, people often say a forecast is "wrong" when actually all that happened is that one of the less likely possibilities happened. For example, if the weather man says that the chance of clear skies is 90% and then it rains, he was not "wrong". After all, in his estimation the chance of rain was 10%. Sometimes the 10% probability comes through.

Answer 3

A forecast is a prediction based upon some information and any prediction is not much more than a guess so a forecast is a educated guess and guesses are rarely correct.

Answer 4

The forecasts are based on "fuzzi logic". THey are simulations or rough predictions of what may happen from few added data.

Ask a computer person. They know much more about how processing units work.

Answer 5

Because they literally can't be.
Chaos Theory says that a very small change in the initial conditions of a process can make the outcome very different.
So a 1 degree temp drop, a slight variation in pressure,
wind speed, humidity, 1 incorrect or miscommunicated
measurement, and the prediction can be way off!!
And there are billions of variables!!

Answer 6

Because a forecast is at best an educated guess.
And a guess is not always correct.

Answer 7

because the forecasters are not God

Answer 8

They are hardly ever correct. Don't plan your life around them

Answer 9

Because no-one and I mean no-one can say what will happen in the future

Answer 10

God controls the weather,nobody can really tell how it will turn up,they just assume