The module pyvortex consists of functions to calculate the equivalent latitude and edge of a polar vortex using Nash criteria.

pip install pyvortex

install the latest version using

pip install git+https://github.com/pankajkarman/pyvortex.git

Latest documentation is available here.

pyvortex is easy to use. Just import:

import pyvortex as vr

Instantiate the PolarVortex class using:

pol = PolarVortex(pv, uwind)

Get equivalent lqtitude for the provided vorticity data as:

eql = pol.get_eql()

If you want to get both equivalent latitude and Vortex edge, just use:

eql = pol.get_edge(min_eql=30)

Example:

Flip pv and uwind along latitude dimension and multiply pv by -1. All other things will be the same.

Example: