Pre-reading notes: The NAO is a variating index which takes into account a semi-permanent high pressure system over the Azores (Azores High) and a semi-permanent low pressure system over Iceland (Icelandic Low). The higher the pressure differences are between this high and low means a +NAO index, while a low difference is a -NAO. -NAO typically gives cool air to the North US and areas around the region.
NAO tracking ensemble models are now in a consensus to head into negative territory beginning mid November. While that is not the official start of Meteorological Winter, it is around the time the Midwest, Plains begin to see their chances for snow significantly rise.
We will carefully watch the NAO and all other variables as we track this potential.
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