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December 2020 General Discussions & Observations Thread


bluewave
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12 hours ago, donsutherland1 said:

I hope I am wrong, too. December will probably provide good insight into how things may evolve. If blocking breaks down after mid-December that could be an indication that winter will wind up warmer and less snowy than normal.

But Don aren't thaws normal?  If we have a cold first half of December that could return in January after a thaw in between. Maybe we'll have a back and forth pattern with chances of snow when switching between patterns?

 

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2 minutes ago, LibertyBell said:

But Don aren't thaws normal?  If we have a cold first half of December that could return in January after a thaw in between. Maybe we'll have a back and forth pattern with chances of snow when switching between patterns?

 

I’m not referring to a thaw, but the evolution toward what is expected to be the predominant winter pattern and also La Niña progression.

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7 minutes ago, bluewave said:

The persistent ridge east of New England continues to beat expectations.
 


5BC020A6-2F29-4AAC-B272-7F0DD4901F29.png.4bd09f4f080aa23bf902a07607c89459.png

There were also numerous records in eastern Canada.

For additional perspective, Caribou’s previous latest 50 degree minimum occurred in November 21, 1954 (51 degrees) and its next such minimum occurred on April 26, 1986 (50 degrees).

 

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1 minute ago, donsutherland1 said:

I’m not referring to a thaw, but the evolution toward what is expected to be the predominant winter pattern and also La Niña progression.

Historically do patterns that evolve in the latter part of December lock in for the majority of winter or are early December patterns more likely to repeat again during the winter, Don?

 

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2 minutes ago, LibertyBell said:

Historically do patterns that evolve in the latter part of December lock in for the majority of winter or are early December patterns more likely to repeat again during the winter, Don?

 

Not always. But if one sees a shift consistent with La Niña, one can have greater confidence in the overall idea that relies on ENSO, etc. There will likely be variability during the course of the winter.

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Just now, donsutherland1 said:

Not always. But if one sees a shift consistent with La Niña, one can have greater confidence in the overall idea that relies on ENSO, etc. There will likely be variability during the course of the winter.

Yes...the winter that comes to mind for me is 2005-06 where we had a cold early December (and snow from the city on west) and then a mild latter December and January with a minor snowfall in January and one big snowstorm in February surrounded by warmth and then a cold and dry March and a renegade early April snowfall to get us to 40"

 

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1 hour ago, bluewave said:

The persistent ridge east of New England continues to beat expectations.
 


5BC020A6-2F29-4AAC-B272-7F0DD4901F29.png.4bd09f4f080aa23bf902a07607c89459.png


the most shocking thing to me here was that Caribou never broke the record of 59F they set in February 1994 for the warmest meteorological winter day.  I figured for sure that record had gotten broken in the last 25 years 

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1 hour ago, SnowGoose69 said:


the most shocking thing to me here was that Caribou never broke the record of 59F they set in February 1994 for the warmest meteorological winter day.  I figured for sure that record had gotten broken in the last 25 years 

The minimum temperature record was more impressive than the maximum. The max beat the DJF record by 1°. But the min beat the previous record by 5°.

Time Series Summary for Caribou Area, ME (ThreadEx) - Month of Dec
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Highest Min Temperature 
Missing Count
1 2020 50 30
2 1964 45 0
3 2003 43 0
- 1939 43 6
5 2011 40 0
- 1951 40 0


 

Time Series Summary for Caribou Area, ME (ThreadEx) - Month of Jan
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Highest Min Temperature 
Missing Count
1 1950 41 0
2 1986 40 0
3 1979 38 0
- 1956 38 0
4 2008 37 0
- 2007 37 0
5 2017 36 0


 

Time Series Summary for Caribou Area, ME (ThreadEx) - Month of Feb
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Highest Min Temperature 
Missing Count
1 1994 42 0
2 1970 41 0
3 1981 39 0
4 1988 38 0
5 1996 37 0

 

Time Series Summary for Caribou Area, ME (ThreadEx) - Month of Dec
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Highest Max Temperature 
Missing Count
1 2020 60 30
2 1950 58 0
3 2010 57 0
4 2001 56 0
- 1969 56 0
5 2000 54 0
- 1982 54 0
- 1973 54 0
- 1966 54 0


 

Time Series Summary for Caribou Area, ME (ThreadEx) - Month of Jan
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Highest Max Temperature 
Missing Count
1 2013 53 0
- 1995 53 0
2 1986 52 0
3 2018 51 0
- 2005 51 0
- 1996 51 0
- 1983 51 0
- 1950 51 0
4 2006 50 0
5 2008 48 0
- 1999 48 0
- 1945 48 0

 

Time Series Summary for Caribou Area, ME (ThreadEx) - Month of Feb
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Highest Max Temperature 
Missing Count
1 1994 59 0
2 1990 52 0
- 1981 52 0
3 2018 51 0
4 2017 50 0
- 2016 50 0
5 2000 49 0
- 1988 49 0
- 1976 49 0
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