Why do different weather services report such vastly different information on the same area.

Question

are the stations that collect data proprietary? And do different people have different information? Or do they use different type of analysis to come up with a degree or two of difference/different ideas about precipitation.

Edited to add an example:

I use the Wewow app and it lets you choose from different weather services and shows forecasts for each of them. For 11 PM tonight here’s a sample is what’s forecasted (c = degrees celsius, pop= probability of precipitation).

World weather online 10c 75pop

AccuWeather 12c and 48pop

Aerisb13c and 0pop

Thanks!

Editing again to say I’m in Ontario, Canada

In: 3

Answer 1

Are you referring to the measurement of current conditions or to forecasts?

There are numerous forecasting models that meteorologists can choose from, so their answers will differ slightly.