Q-Vector

[Trey Alvey]

Does anyone know where I can find DIVQ charts online (particularly for layers rather than a given height)? I would consider GEMPAK but it's not mac compatible as far as I'm aware and I'm not even certain it has DIVQ.

Also, can someone verify my thinking here? Looking at a q vector convergence map, one would look for larger positive values which indicates rising motion. Looking at a q vector divergence map (DIVQ), one would look for larger negative values to indicate rising motion.

 

[rdale]

GEMPAK is Mac compatible (two ways, direct and through VMWare) and can compute div-Q. I'm not a maccie though so not sure on details.

 

[Tim Supinie]

The Hoot website has Q-vector maps: http://hoot.metr.ou.edu/upperair/qvec/current/ . As rdale mentioned, GEMPAK can compute Q-vectors (the Hoot site uses GEMPAK for its images).

And your thinking on that is correct, it's a difference in where you put the sign.