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December 2016 Discussion & Observations


bluewave

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8 minutes ago, Ralph Wiggum said:

Interesting.....ensembles are slowly backing off the idea of a total pattern reversal and now showing a transient "warmup" with more cold and storminess on the way. Do I even see signs of the Scandinavian Ridge trying to push the AO negative??

Today's run of the 12z GFS was a lot better...snow Saturday and then one more storm threat around 12/20 before the SE ridge exerts more dominance. Although it's showing a GOA low in the long range, the feature is weaker and the pattern more dominated by a PAC ridge that brings some cold air down. Should be an interesting couple of weeks starting with Wednesday's arctic front.

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Saturday morning and early afternoon is going to be very ugly. Unmodified, super dry arctic air in the teens and single digits at the surface getting overrun by very warm air, strong low-level southerly jet at the mid and upper levels with a powerful warm front. Whatever snow and sleet we have early that morning is going to go over to freezing rain/ice storm it's going to be very very nasty before temps finally warm into the 40's and we go to all rain Saturday evening

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6 hours ago, bluewave said:

Yeah, December temperatures near or below 10 degrees have become rare here since the 1980's. So it will be interesting to see how close NYC can get.

NYC near or below 10 degree December lows since 1980(coldest of month)

1980...-1

1983...4

1987...8

1988...5

1989...6

1993...10

2004...11

12/16 top three coldest temperatures

7...1876...9...1917...9....1883

Something in the 10°-12° range seems reasonably likely. Hopefully, the maximum CAA will be timed just right so that NYC gets into the single digits.

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7 hours ago, donsutherland1 said:

It will be interesting to see if the temperature in NYC falls below 10°. The last time that happened in December was December 27, 1989 when the temperature fell to 8°.

Of course, December 1989 was brutally cold (4 days with single-digit lows; 16 days with low temperatures below 20°; Mean low: 19.1°, Mean high: 32.6°, Mean temperature: 25.9°; and, one day with a high temperature of 18°).

The rest of the winter was much warmer (1 single-digit low; 3 days with lows below 20°; Mean low: 33.2°; Mean high: 48.0°, Mean temperature: 40.6°; and lowest high temperature of 25°).

I'm not sure that we'll see such a dramatic shift, but do believe the latter half of December will probably average milder than normal.

When was the last winter for Central Park when the lowest temperature of the winter was in December?

 

Edit: The winters of 1997-1998 and 1998-1999 both came close to having December as the seasonal lowest minimum temperature, but both occurred just after the new year.

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17 minutes ago, tmagan said:

When was the last winter for Central Park when the lowest temperature of the winter was in December?

Winter 2005-06. The coldest temperature was 14°, which occurred on December 14. Since 1980-81, the following winters have seen the coldest reading in December:

1980-81, 1983-84, 1988-89, 1989-90, 2000-01, and 2005-06. The 1988-89 low temperature of 5° occurred on December 12, 1988.

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7 hours ago, donsutherland1 said:

It will be interesting to see if the temperature in NYC falls below 10°. The last time that happened in December was December 27, 1989 when the temperature fell to 8°.

Of course, December 1989 was brutally cold (4 days with single-digit lows; 16 days with low temperatures below 20°; Mean low: 19.1°, Mean high: 32.6°, Mean temperature: 25.9°; and, one day with a high temperature of 18°).

The rest of the winter was much warmer (1 single-digit low; 3 days with lows below 20°; Mean low: 33.2°; Mean high: 48.0°, Mean temperature: 40.6°; and lowest high temperature of 25°).

I'm not sure that we'll see such a dramatic shift, but do believe the latter half of December will probably average milder than normal.

Yeah the pattern shift from Dec 89 to Jan 90 was extreme...Mean temp here in Dec was 24.6 and in Jan 39.8 degrees, The coldest and warmest respective months on this stations record.

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11 minutes ago, snowman19 said:

Thoughts on possible Saturday morning ice storm prospects?

I dont like how the high is forecasted to move east now instead of north/east. That  south east wind will warm us quicker. That artic air will be hard to move from the surface over inland areas. The preciep should get here quick so i hope we can take full advantage of the airmass in place. If that high was moving north east i would be more worried about ice 

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1 minute ago, bluewave said:

Looks like we follow the short duration snow cover pattern of last winter with 50's coming in for late Saturday night into Sunday.

That warm front is very strong and means business. The models are showing the boundary layer skyrocketing very quickly once it passes. Tremendous WAA. Like you said, temps may hit the 50's Saturday night into early Sunday morning. Almost certainly accompanied by heavy fog

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