Continuous time weather regimes

Weather regimes are prefered atmospheric states (Legras and Ghil 1985; Vautard 1990). They can be computed on pressure fields with classification algorithms. We use a kmeans algorithm on sea-level pressure to determine four weather regimes over the North Atlantic region, from the NCEP reanalysis.

We use a method developed by Yiou et al. (2008) to stabilize the computation of the classes, by Monte-Carlo experiments and a classification of the experiments.

Read more: Continuous time weather regimes

Analogue Software

The A2C2 project develops open source software for the computation of atmospheric analogues. At present, the software is in a "developer" mode, i.e., it only contains a core for the computation & file manipulation. There is no cool front end with guis, graphics and those kinds of gizmos... which are under development.

At present, the core code can be obtained here.

Read more: Analogue Software

Continuous time analogues

Analogues of atmospheric circulation are weekly computed from the SLP of NCEP (daily) reanalysis. We consider the North Atlantic region (80W-30E; 30-70N).

The evaluation of the SLP analogues is updated regularly.

Read more: Continuous time analogues