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Interesting Features In the Weather Over the Next Month

The unusual cold in the north & continual domination of the semi-permanent hot ridge made for an interesting tug o' war.

Posted: Sep. 23, 2018 12:36 PM
Updated: Sep. 23, 2018 1:07 PM

A shot of quite cold air for the time of year is still progged to move southward in the coming days.

The remnants of a typhoon (possibly a second typhoon) will only help to dislodge the cold southward as it pushes unusually warm air into Alaska.  This tipped the cold over the Arctic way southward.

Unseasonable, heavy snows will fall across far southern Canada to as far south as the U.S. Rockies & perhaps even northern North Dakota to Minnesota.  Record cold is possible of the very early snowpack.

Current snow cover:

Meanwhile, the same strong ridge (that has been around much of the summer & brought us four rounds of extended 90s heat since early to mid August), that is anchored by the unusually warm waters off the East Coast,will continue to try to dominate the eastern U.S.

It will be a war between the unusually cold air being discharged southward & the strength of the hot ridge.

The ridge is so strong, it is possible that the southeast U.S. never gets in on the chilly, Canadian airmass as "endless summer" continues there. This may even be the case right up the East Coast!

Note the sharp contrast in temperature anomalies for this latter part of September. Also see the cold shot getting dislodged southward into our area, but the southeast hot ridge remains strong. 

Overall trend for the end of September is for cooler weather & wetter pattern.  We will be right on the edge of the ridge, so front may tend to hang up south of us, keeping us within rainfall frequently.

Temperature anomalies late September, then to early October:

Still looks like trend towards a bit wetter than normal even into late October:

Rainfall anomalies later September to early October:

There are still signs of that southeastern ridge expanding rapidly northward for a short of summer for the area after October 4.  So, we get colder with an October chill, then it is early September-type warmth for a bit.

However, after this burst of warmth, looks like the chill will work back in with potential frost & freezing here.  Note how the southeastern hot ridge still doesn't go away, however.

It is also impressive how consistently cold Canada & the U.S. stays.........with multiple rounds of snow very early!  Alaska will continue to be blazing warm (in comparison to normal) right into late October.

If not for that HOT southeastern ridge acting as a bit of a block, we would be in for one unusually COLD October. 

With the oscillating heat/chill here, still went for October temperatures averaging a bit below normal.

With us being close to the edge of that ridge, I am going a bit above normal now on rainfall, compared to the "normal" wording I had previously.

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