The coldest air of the season so far is on the way this weekend. Meanwhile, a second, more significant blast of arctic air is likely next week. The latest 6 – 10 day temperature outlook from the Climate Prediction Center reflects this well (see figure 1).
Initially it looked like negative NAO was going to be driving this next week. However, it will actually be a positive PNA oscillation.
We are going to have a trough sweep across the Central and Eastern half of the nation Thursday into Friday. An associated cold front will drop down across the south.
The coldest air of the season so far will move in behind the front this weekend. Lows will range from the 30s to 40s, with highs in the 40s to lower/mid 60s.
A much deeper upper-level trough is going to get carved out over the eastern half of the country Monday/Tuesday. Yet another cold front will move through.
There is still some uncertainty regarding the overall magnitude of this second cold-shot. However, it could be rather significant. The latest GEFS and EPS runs are indicating that we could be looking at temperatures 15 degrees below normal. This could potentially mean the first frost/freeze of the season for many.
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