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December 2022 Obs/Disc


40/70 Benchmark
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Well, I am going to finish the month of December with 2" of snow.

Since 1950, there have been 6 other cold ENSO seasons in which my locale received 3" or less of snowfall during the month of December.

1955-1956: 2" with a seasonal total of 87.3"

1973-1974: 1.8" with a seasonal total of 44.8"

1988-1989: 2.6" with a seasonal total of 20.3"

1998-1999: 1" with a seasonal total of 41.9"

1999-2000: T with a seasonal total of 33.3"

2021-2022: 2" with a seasonal total of 42.5"

This bolsters confidence in my seasonal forecast range of 60-70" because while the mean seasonal snowfall is only 45", it would be wise to hedge upwards given how the month of December actually evolved.

Note the utter lack of high latitude blocking in the composite:

This plot is not dissimilar to the PNA

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2 minutes ago, 40/70 Benchmark said:

Well, I am going to finish the month of December with 2" of snow.

Since 1950, there have been 6 other cold ENSO seasons in which my locale received 3" or less of snowfall during the month of December.

1955-1956: 2" with a seasonal total of 87.3"

1973-1974: 1.8" with a seasonal total of 44.8"

1988-1989: 2.6" with a seasonal total of 20.3"

1998-1999: 1" with a seasonal total of 41.9"

1999-2000: T with a seasonal total of 33.3"

2021-2022: 2" with a seasonal total of 42.5"

This bolsters confidence in my seasonal forecast range of 60-70" because while the mean seasonal snowfall is only 45", it would be wise to hedge upwards given how the month of December actually evolved.

Note the utter lack of high latitude blocking in the composite:

This plot is not dissimilar to the PNA

Composite Plot

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7 minutes ago, 40/70 Benchmark said:

Well, I am going to finish the month of December with 2" of snow.

Since 1950, there have been 6 other cold ENSO seasons in which my locale received 3" or less of snowfall during the month of December.

1955-1956: 2" with a seasonal total of 87.3"

1973-1974: 1.8" with a seasonal total of 44.8"

1988-1989: 2.6" with a seasonal total of 20.3"

1998-1999: 1" with a seasonal total of 41.9"

1999-2000: T with a seasonal total of 33.3"

2021-2022: 2" with a seasonal total of 42.5"

This bolsters confidence in my seasonal forecast range of 60-70" because while the mean seasonal snowfall is only 45", it would be wise to hedge upwards given how the month of December actually evolved.

Note the utter lack of high latitude blocking in the composite:

This plot is not dissimilar to the PNA

Hopefully not heading To a  99-2000

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I'm usually not huge on the "la nina is dying, so that will help late" train, but that seemed to be a factor in 1956...it could actually play a role this season. Regardless of any SSW, I do expect a nice March (yea, I know the sun will melt it and it sucks that December didn't deliver for the holidays and low sun angle).

-0.7 -0.6 -0.7 -0.8 -0.8 -0.7 -0.7 -0.7 -1.1 -1.4 -1.7 -1.5
1956 -1.1 -0.8
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28 minutes ago, 40/70 Benchmark said:

This season compares fairly favorably to December 1955:

This plot is not dissimilar to the PNA

Actually impressive how close the match is on the pattern over much of North America…except we got the PV trapped under the Baffin block in Dec ‘55 which actually just gave us suppression depression and frigid temps. 

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