I'm just curious what methods others have for planning the weather on more out-of-the-way routes?

Should probably anticipate anything, but I mean "get an actual sense for what is _likley_"

Most weather sites forecast a week or more out, is that sufficient for y'all? Anyone using radar/satellite apps like wunderground to get more crisp? Even for a day trip going a few hundred miles away, I'm just curious how people research and anticipate weather on their trips.