For simplicity, there are basically 3 weather models that run 4 times a day and go out 14+ days. The GFS (American), European, and Canadian. There are more than that but those are the main ones and many websites that show them. All the data is the same, with different graphical interfaces.
What has happen over the last 5-10 years as weather phone apps have become more common is that the published forecasts have been going further and further out.
It used to be nobody even published forecast past day 7, because everyone knew how inaccurate that may be. But then to get more users, 10 day forecasts came out, then a competitor app promotes a 14 day forecast. Where do you think a those forecasts are coming from? They are not actually forecasts done by a human, they are compiled data from the latest computer model runs.
I have been watching weather computer models for a while and it took a long time to decipher what they are showing, but one of the first things I learned the hard way was how wildly the output from the computer models vary from run to run... Oh my the GFS is showing a 24" snowstorm for me in 10 days!... only for the next model run to revert back to warm, dry, and snowless, and the next one after that shifts the stormtrack by 500 miles.... etc.
Regarding this winter so far. If you were to draw a jet stream setup for the best snow pattern possible for the northern midwest, this winter has had the mirror image so far. Its pretty much the opposite of 2013-14 so far.