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October 2019 General Discussions & Observations Thread


Rtd208
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4 hours ago, CIK62 said:

The last 7 days of October going out in style at an average of 58degs., or about 6degs. AN.    No BN days apparently, afterall.

Month to date is  +2.0[60.0].      October should end at  +2.7[59.6].

54.3* here at 6am.

 

You mean the Euro beat the GFS long term? And people are foolish for buying it? You dont say.

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48 minutes ago, NYCweatherNOW said:

I think the cold and finally some snow occurs around November 20th and on. December starts average and we have a white Christmas and very cold New Years. January is normal in the beginning with mostly small snow events until you hit mid February we can get a really big snowstorm. Early February is cutter city. Average temps throughout winter. March is cold and some snow early and than spring comes in early this year.

This belongs in banter. 

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Sunday is all about where the warm front stalls out. Euro PWATS are 1.75”to 2.00”.The record for the last week of October is 1.8”on the OKX sounding climo. We just don’t know yet where the axis of heaviest rains will set up.

 

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7 hours ago, bluewave said:

This persistent -PNA pattern resulted in a big shift west for the Pacific SST warm blob. It moved from near California to the Aleutians since Labor Day. This reflects a pattern with only transient cool downs before the SE Ridge reloads.

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Seems to show as well that N PAC temp anomalies respond to the pattern vs the other way around. The insane PAC Jet pattern needs to calm down though before we can get sustained cold here and hope for a pattern other than regular cutters. Luckily it’s still mid-Fall. 

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1 hour ago, jm1220 said:

Seems to show as well that N PAC temp anomalies respond to the pattern vs the other way around. The insane PAC Jet pattern needs to calm down though before we can get sustained cold here and hope for a pattern other than regular cutters. Luckily it’s still mid-Fall. 

Yeah, the SST’s warm under the areas where the blocking ridges get stuck.The ridge axis keeps building near the Aleutians. So we get a persistent SE Ridge pattern. The warm SST’s and ridges probably enhance each other in the locations where they line up together.

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4 minutes ago, NYCweatherNOW said:

Terrible call by me. At least I got the second half of October being wet. Full pattern change mid November snow by the 22nd is my newest call

Stop hugging the GFS, its a horrible model. 

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Just now, SnoSki14 said:

It really is, complete fail for late October. 

Cool down keeps getting pushed back, looks incredibly warm for last week of October into November now. 

use the GFS at one's own risk.  Euro and its ensembles are the way to go...until I see cold there forget about it.   Still waiting for a frost here.  Had some scattered frost a couple of mornings but still hearing crickets and the annuals are still going

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10 minutes ago, Brian5671 said:

use the GFS at one's own risk.  Euro and its ensembles are the way to go...until I see cold there forget about it.   Still waiting for a frost here.  Had some scattered frost a couple of mornings but still hearing crickets and the annuals are still going

This says it all.

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A warmer than normal October is poised to end on a warmer than normal note. Before then, a moderate to significant rainstorm could affect the region Saturday night and Sunday. A general 0.50"-1.50" rain is possible.

Cooler air will move into the region to start November. Afterward, the cool conditions will likely persist through the first week of November before slowly yielding to milder than normal temperatures during the second week of November.

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 16. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.82°C and the ENSO Region 3.4 anomaly has averaged +0.28°C. A neutral ENSO is currently the base case for Winter 2019-20.

Since 1981, approximately one out of every seven December cases involved a neutral ENSO. In general, a neutral ENSO in which Region 1+2 had a cold anomaly and Region 3.4 had a warm anomaly (as has been the case in the 6 week moving average) saw a warmer than normal December. Such neutral ENSO cases accounted for about 27% of all neutral ENSO December cases during the 1981-2018 period. This data does not consider blocking, as it is too soon to be confident about that factor in December. However, the greatest warmth coincided with a negative PDO while the coldest outcome coincided with a strongly positive PDO (+1.00 or above for December). Therefore, the first part of winter could start off milder than normal in the Middle Atlantic and southern New England regions.

The SOI was -16.76 today.

Today, the preliminary Arctic Oscillation (AO) figure was +0.493.

Since 1950, there have been five prior cases when the AO averaged -0.500 or below in both July and August: 1950, 1958, 1960, 1968, and 2015. The average temperature for September through November in New York City was 58.9° (59.6° adjusted). All cases featured a warmer than normal fall. There remains a potential for autumn 2019 to rank among the 30 warmest cases on record. For New York City, that would translate into a September-November mean temperature of at least 58.8°.

In August, the AO averaged -0.722 and in September the AO rose to +0.306. The possible transition to predominantly positive values from September into October has been a relatively uncommon occurrence. Since 1950, only 1963 and 2011 saw a transition of an August value of -0.500 or below to positive values in September and a positive average in October. Both cases featured a warmer than normal November in the Middle Atlantic and southern New England areas. Despite what might be a somewhat cooler than normal start to November, a warmer than normal outcome for the month as a whole remains likely.

On October 24, the MJO was in Phase 3 at an amplitude of 1.180 (RMM). The October 23-adjusted amplitude was 1.652.

In the two prior cases when the MJO moved into Phase 1 in late September or early October and then remained in Phase 1 for 12 or more consecutive days as occurred this year, the average decline in the 14-day average temperature for the 2-3 weeks that followed the MJO's moving out of Phase 1 was gradual. The current long-duration Phase 1 episode suggests that the second half of October could be warmer than normal. For New York City, an October mean temperature of 58.5°-59.5° (1.6° to 2.6° above normal) would be implied by those earlier long-duration Phase 1 cases. Based on the sensitivity analysis, the estimated October mean temperature is currently near 59.5°.

Since 1974, there were 3 cases that saw the MJO in Phase 2 at an amplitude of 1.500 or above for at least 3 days during the October 15-25 period, as occurred this year: 1990, 2011, and 2015. All three cases featured a warmer than normal November in New York City and readings that were 3° or more above normal during the second half of November.

That historic experience with the MJO lends support to the latest EPS weeklies and CFSv2 weeklies, both of which show warmer than normal conditions predominating during the second half of November.

Based on sensitivity analysis applied to the latest guidance, the implied probability of New York City having a warmer than normal October is approximately 99%.

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The last 6 days of October erupt to average 61degs., or about 9degs. AN.( complete bust squared)    

Month to date is  +2.1[59.9].        At this rate October may end at  +3.2[60.1].

Not as nutty as last November which was  +6.0 for Nov. 1-7 and -6.2 for Nov. 8-30 giving a -3.3 overall.       So still some hope.

In order for this SON to end up BN, November will have to be about -5.5[42.2].   Last time November was that low is in 1976.

How 'bout that Foot of Snow on the 7th!

57.3* here at 6am.

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