Extracting envelopes of non-zonally propagating Rossby wave packets. Submitted to Monthly Weather Review

In this note we propose an improved technique to extract envelopes of wave packets of synoptic scale Rossby waves. In the currently used techniques the wave packets are assumed to be propagating along latitude circles. In our new technique, we take into account the possibility that the waves may propagate in a direction that is not purely zonal. We demonstrate the advantages of the new technique both on analytical and real-world examples.