I wonder if somebody would be able to help with a question...
I'm looking at the meto fax charts for tomorrow, which show a trough from roughly the wash down to the south west. How would you go about picking these out on the NW extra charts? I'm guessing with a combination of the vorticity and vertical velocities but I can never really work it out or nothing really stands out to my untrained eyes! I can see there is some vertical lift showing and that it moves eastwards (I guess with the trough) but is there more to it than that? Any help would be appreciated, thanks.