Long Range Arctic Oscillation Pointing Negative

Courtesy Kyle MacRitchie

A long range forecast for the Arctic Oscillation, an index commonly used to distinguish potentials of cold weather, is dipping into negative territory. As shown above, ensemble forecasts of the AO are bringing the index well into negative territory beginning in October and into the winter months.

A continuity of such a negative Arctic Oscillation would enhance cold weather potential over the nation. A negative AO also enhances the chances for a negative NAO, seeing as how close the two indices are. This does not necessarily mean that they will both go negative, but, because they are so close in how they function, they can move together.

This is still very long out and subject to major change, so take this and use it at your own risk.

Andrew