I have never before seen anything like that dark blue band running from west-southwest to East-northeast as two fronts collide
@JohnBrady It’s call Nullschool. The web version is earth.nullschool.net/.
The app is quite new, but has the advantage of being able to use a smartphone’s GPS to localize the view. (To get the same thing on the web version, I had to figure out my latitude and longitude and code them into the URL.)
You can view many kinds of data, but surface air currents color-coded for temperature is what I find most useful.
I think @Miraz turned me onto it.
