Around here, the weather forecast changes pretty drastically depending on altitude. We have an enormous hill right in our backyard, and there are days when I can look up the hill and see it snowing, or socked in with clouds, while “down below” at our house it’s nice and sunny. NOAA gives forecasts mentioning snow, but only above a certain altitude, and so forth.
The other day I saw a great example of this: a snow line on the Mission Mountains. Notice the distinct line of snow in the trees. Pretty cool!