Saturday, November 17, 2012

3pm: 1st Week of Dec Temps & Negative NAO

The below map shows the departure from normal that temperatures are forecast to be entering the 1st week of December. Blue is below normal, red is above normal. As of now looking like departures of over 2 degrees below normal. In addition it looks like we will be entering a negative phase of the NAO (see basic lingo defined tab at top of webpage for definition) which could set us up for a very active December for winter weather.


The red over Greenland is showing the negative NAO which means a strong trough should develop on the east coast during that same time period. Red represents higher pressure and blue represents lower pressure. Areas of blue usually mean troughs in jet stream and areas of red are ridges.


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