Wednesday Jan 4th believe it or not is known as the day that the earth is closest to the sun. This is what is know as the perihelion. Here is a link below with more information on it.
Thursday, Friday and for the most part lets call it the weekend. Temperatures will be running once again above average. Highs on Thursday will be back in the 30s. With Friday's temps well into the 40s for the southern and central part of Michigan with 30s north.
After a weak system passes through the great lakes Sunday and brings a brush of cold air to start the work week. Long range models of the Euro and the GFS continue to "hint" at a storm system. Still 7 days out but right now, based of the GFS below and the euro. The cold air is still locked up to the northwest and the phasing of the two jets would be late. Making this a open wave or a small event as it moves through the great lakes.
Interesting note today in the Detroit NWS afternoon forecast discussion. There has been above normal monthly average temperatures since May of 2011 (Metro Airport AOS). Yes January is starting out mild. But I took a venture down index lane today and the two maps I have down below are the AO and NAO outlooks. The explainer link is below. But basically, if those two indexes are negative combined with a positive PNA. This would tend to lead towards colder air and slower storm paths (more snow) with a Greenland blocking high. Both the NAO and the AO are forecasted to go negative and the PNA is forecasted to go neutral/slightly negavtive /http://www.ldeo.columbia.edu/res/pi/NAO/
AO Outlook showing the AO going negative by mid Jan .
NAO outlook- Also showing it swinging towards Negative.
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