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October 2021


Stormlover74
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20 hours ago, uncle W said:

I remember back in 1971 when October was warm to the end...November turned out colder than normal with record cold...December reverted back to warmer than normal...it took until late January for real winter pattern to lock in for a month...like last year February was the coldest snowiest month...the real winter pattern was locked in for a month...1995-96 was locked in from 12/9 to 1/12...then a pause...then three more weeks the beginning of February and on and off in March ...

and into April!

 

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2 hours ago, bluewave said:

Yeah, it’s been  a long time since we had a cold pool and deep trough in the Northeast Pacific during the fall.

 

 

If he’s correct and a AK/GOA vortex is a persistent, semi-permanent feature this winter, we are in a lot of trouble. An AK/GOA vortex is a mega torch pattern for the CONUS and Canada

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35 minutes ago, snowman19 said:

If he’s correct and a AK/GOA vortex is a persistent, semi-permanent feature this winter, we are in a lot of trouble. An AK/GOA vortex is a mega torch pattern for the CONUS and Canada

 

The chance this pattern holds is close to zero...anyone who wants cold and snow wants this pattern to keep up another 3-4 weeks before it flips but its almost never that a pattern from September holds all winter.

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1 hour ago, SnowGoose69 said:

 

The chance this pattern holds is close to zero...anyone who wants cold and snow wants this pattern to keep up another 3-4 weeks before it flips but its almost never that a pattern from September holds all winter.

In our old Climate this was definitely true. The problem is we have seen ultra persistent patterns in recent years. The question is how long this can hold. It’s not what we want to see.   

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1 hour ago, snowman19 said:

If he’s correct and a AK/GOA vortex is a persistent, semi-permanent feature this winter, we are in a lot of trouble. An AK/GOA vortex is a mega torch pattern for the CONUS and Canada

No offense but if it were the reverse right now you would say the pattern would change in time and cause a mild, snowfree winter. 

I personally think we're going to an AN temp winter with near normal snows though that's highly dependent on blocking.

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21 minutes ago, SnoSki14 said:

Strong coastal signal for next week though not sure where it'll end up. 

EPS definitely has more of a +PNA showing up late October into early November.

looks like some blocking too....could give someone a soaker if we get a slow moving storm-we are due, most areas have had little rain since 9/1.

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1 hour ago, LongBeachSurfFreak said:

In our old Climate this was definitely true. The problem is we have seen ultra persistent patterns in recent years. The question is how long this can hold. It’s not what we want to see.   

It really does feel like summer tonight! Just one of those early September nights! I 100% agree about this 3 month pattern persistence. It’s something we have been stuck in for years now. I remember last November it was 70 degrees to start the month. It was great for the late season stripe bass fishing. I’m completely okay with it being warm currently! I don’t want a ideal pattern for snow until mid December 

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22 minutes ago, bluewave said:

I can remember when Eastern Troughs  at the end of October actually had some decent cold. This time the Pacific is very unfavorable. The -NAO blocking is also pressing pretty far south near New England.


BD0095C3-C838-43F2-BA27-BBC163E9E125.thumb.png.6cd41571761a55ccacb9fa804afed79b.png

C1A5D447-77E6-437B-A80B-95023DAA8993.thumb.png.5dfb7089975fb777dfaa6c0d49a19363.png

The source region continues to be from the pac with any trough we do get. Until that changes are cool downs will be brief and around normal 

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Not wintry but definitely signs that one of these troughs crossing the mid Atlantic coast between the 25th-30th is going to create an ocean nor'easter of 40-50kt... whether its' grazing Delmarva or LI?  and with only a few 40 kt gusts or more vigorous on our coasts? Tides are not abnormally high so that is good.  The previously posted 500MB height departures from normal show the blocking.  

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Under bright sunshine, the temperature surged into the middle and upper 70s across much of the region. High temperatures included:

Bridgeport: 77° (old record: 75°, 1953)
Islip: 75° (old record: 74°, 1969, 1979, and 1984)
New Haven: 77° (old record: 73°, 1953 and 2017)
New York City-JFK: 79°
New York City-LGA: 80° (old record: 79°, 1953 and 1984)
New York City-NYC: 75°
Newark: 80° (tied record set in 1947 and tied in 1969)
Philadelphia: 76°
White Plains: 74°

Newark reached 70° for the 172nd time this year. As a result, 2021 is now has the 2nd most days on record. Today was also Newark's 116th 80° day, which ranks 2nd on the all-time list.

Tomorrow and Friday will be unseasonably warm. Another cool shot is likely for the weekend.

The MJO has now completed its passage through Phase 5 at a very high amplitude. During the 1991-2020 period, there were 6 cases with passage through Phase 5 with at least three days at an amplitude of 1.500 or above: 1998, 2000, 2004, 2010, 2017, and 2020. There was a strong signal for the second half of October to wind up warmer than normal (83%) cases in the New York City area. However, that signal broke down to a 50-50 split for the first 10 days of November. That hints at possible timing for a pattern transition depending on the pattern evolution and changes in the teleconnections.

Fall 2021 will likely be wetter to much wetter than normal in the northern Middle Atlantic region. Since 1869, there have been 9 August cases where New York City picked up 20.00" or more rainfall during the summer. Two thirds of those cases (and 4/5 of those with summer mean temperatures of 73.0° or above) had 17.00" or more fall precipitation in New York City. 2011 is probably the closest match in terms of precipitation and a nearly identical summer mean temperature. Mean fall precipitation for those 9 cases was 14.86". The median was 17.35". The 1991-2020 normal value is 12.27".

Following very wet July-September periods, winter (December-February) precipitation has typically been near or below normal. The most recent exception was winter 2018-19.

The ENSO Region 1+2 anomaly was -0.2°C and the Region 3.4 anomaly was -0.8°C for the week centered around October 13. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.15°C and the ENSO Region 3.4 anomaly has averaged -0.43°C. La Niña conditions will likely persist through at least mid-winter.

The SOI was +6.70 today.

The preliminary Arctic Oscillation (AO) figure was +0.151 today.

On October 18 the MJO was in Phase 2 at an amplitude of 0.315 (RMM). The October 17-adjusted amplitude was 0.375 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 98% probability that New York City will have a warmer than normal October (1991-2020 normal). October will likely finish with a mean temperature near 61.7° (3.8° above normal).

 

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4 hours ago, donsutherland1 said:

Under bright sunshine, the temperature surged into the middle and upper 70s across much of the region. High temperatures included:

Bridgeport: 77° (old record: 75°, 1953)
Islip: 75° (old record: 74°, 1969, 1979, and 1984)
New Haven: 77° (old record: 73°, 1953 and 2017)
New York City-JFK: 79°
New York City-LGA: 80° (old record: 79°, 1953 and 1984)
New York City-NYC: 75°
Newark: 80° (tied record set in 1947 and tied in 1969)
Philadelphia: 76°
White Plains: 74°

Newark reached 70° for the 172nd time this year. As a result, 2021 is now has the 2nd most days on record. Today was also Newark's 116th 80° day, which ranks 2nd on the all-time list.

Tomorrow and Friday will be unseasonably warm. Another cool shot is likely for the weekend.

The MJO has now completed its passage through Phase 5 at a very high amplitude. During the 1991-2020 period, there were 6 cases with passage through Phase 5 with at least three days at an amplitude of 1.500 or above: 1998, 2000, 2004, 2010, 2017, and 2020. There was a strong signal for the second half of October to wind up warmer than normal (83%) cases in the New York City area. However, that signal broke down to a 50-50 split for the first 10 days of November. That hints at possible timing for a pattern transition depending on the pattern evolution and changes in the teleconnections.

Fall 2021 will likely be wetter to much wetter than normal in the northern Middle Atlantic region. Since 1869, there have been 9 August cases where New York City picked up 20.00" or more rainfall during the summer. Two thirds of those cases (and 4/5 of those with summer mean temperatures of 73.0° or above) had 17.00" or more fall precipitation in New York City. 2011 is probably the closest match in terms of precipitation and a nearly identical summer mean temperature. Mean fall precipitation for those 9 cases was 14.86". The median was 17.35". The 1991-2020 normal value is 12.27".

Following very wet July-September periods, winter (December-February) precipitation has typically been near or below normal. The most recent exception was winter 2018-19.

The ENSO Region 1+2 anomaly was -0.2°C and the Region 3.4 anomaly was -0.8°C for the week centered around October 13. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.15°C and the ENSO Region 3.4 anomaly has averaged -0.43°C. La Niña conditions will likely persist through at least mid-winter.

The SOI was +6.70 today.

The preliminary Arctic Oscillation (AO) figure was +0.151 today.

On October 18 the MJO was in Phase 2 at an amplitude of 0.315 (RMM). The October 17-adjusted amplitude was 0.375 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 98% probability that New York City will have a warmer than normal October (1991-2020 normal). October will likely finish with a mean temperature near 61.7° (3.8° above normal).

 

omg JFK got so close to 80!  what happened? there was no sea breeze they should've made it!  what was JFK's record? I have my fan on lol.  Another chance tomorrow?

 

 

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