Let me say again, this is a somewhat complicated but very preliminary analysis of the data: someone needs to look at the connections carefully before one can conclude much from them. Clearly better station data in your area is required before we can get any further: what I have looked at so far is pretty inconclusive.
But I hope I have given you an idea of how those connections would be researched, and at least a preliminary guess at what those conclusions might be. With any luck, the more careful analyses that will follow as part of IRI and ECMWF will be more conclusive and thus more helpful.