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
It depends heavily on what they consider the forecast area and forecast duration. One service’s definition of Ontario may be larger or smaller than another’s. I think this is the case for your example, as the temps aren’t drastically different but the precipitation chance is.
Precipitation chance is really the amount of a given area experiencing rain over a given interval.
A storm covering an entire area for an entire interval is 100% chance of rain. A small storm that only covers a tiny strip but moves across the entire area in the interval is also 100%. The same storm that only moves in halfway is a 50% chance.
One service may consider a 5 km^2 area over 1 hour having a 50% chance, while another may consider a 10 km^2 area over 30 minutes having a 30% chance even though they’re talking about the exact same storm centered on the exact same location.
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