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October 2021


Stormlover74
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Morning thoughts…

It will be partly to mostly cloudy and milder. High temperatures will likely reach the upper 60s and lower 70s in most of the region. Likely high temperatures around the region include:

New York City (Central Park): 70°

Newark: 74°

Philadelphia: 74°

Normals:

New York City: 30-Year: 66.2°; 15-Year: 67.3°

Newark: 30-Year: 67.8°; 15-Year: 69.2°

Philadelphia: 30-Year: 69.0°; 15-Year: 70.0° 

A generally warmer than normal regime will continue into the weekend before a strong cold moves across the region.

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Top 10 warmest first 10 days of October for several of our stations.

 

Time Series Summary for FARMINGDALE REPUBLIC AP, NY
Click column heading to sort ascending, click again to sort descending.
Rank
Ending Date
Mean Avg Temperature Oct 1 to Oct 10
Missing Count
1 2007-10-10 68.9 0
2 2018-10-10 67.7 0
3 2017-10-10 67.1 0
4 2005-10-10 66.2 0
5 2013-10-10 65.9 0
6 2021-10-10 64.6 0
7 2002-10-10 64.4 0
8 2020-10-10 62.0 0
9 2019-10-10 61.8 0
10 2016-10-10 61.5 2

 

Time Series Summary for ISLIP-LI MACARTHUR AP, NY
Click column heading to sort ascending, click again to sort descending.
Rank
Ending Date
Mean Avg Temperature Oct 1 to Oct 10
Missing Count
1 2007-10-10 68.5 0
2 2018-10-10 68.0 0
3 1990-10-10 66.7 0
4 2017-10-10 66.6 0
5 2013-10-10 65.6 0
6 2005-10-10 65.5 0
7 2021-10-10 63.7 0
8 2002-10-10 63.3 0
9 1995-10-10 63.2 0
10 1997-10-10 63.0 0
- 1983-10-10 63.0 0

 

Time Series Summary for NEWARK LIBERTY INTL AP, NJ
Click column heading to sort ascending, click again to sort descending.
Rank
Ending Date
Mean Avg Temperature Oct 1 to Oct 10
Missing Count
1 1959-10-10 72.4 0
2 2007-10-10 71.8 0
3 2018-10-10 69.6 0
4 2017-10-10 69.5 0
5 1990-10-10 68.8 0
6 1941-10-10 68.5 0
7 2013-10-10 67.2 0
8 2021-10-10 66.9 0
9 1973-10-10 66.7 0
10 1949-10-10 66.4 0
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Pesty clouds for another day or half day then onto late season warmth Tue (10/12) through Sat (10/17) ahead of strong cold front.  Coolest lows of the season Sun (10/18) - Tue and Wed(10/21).  Warmup by mid next week and overall warmer pattern beyond with brief cooldowns.

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Let us remember for future non-automatic default to the EC/EPS as best.: GFS/GEFS prevailed as far superior to the EC/GGEM op runs in their greater than 3 day outlooks for this past weekends rain/drizzle with the main rain just a little offshore. Two-day CoCoRaHs weekend summary attached and for those who want to view it more clearly-just click the image.  

Nothing precip-wise/damaging wind seems threadablefor a while.

Screen Shot 2021-10-11 at 10.37.13 AM.png

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54 minutes ago, wdrag said:

Let us remember for future non-automatic default to the EC/EPS as best.: GFS/GEFS prevailed as far superior to the EC/GGEM op runs in their greater than 3 day outlooks for this past weekends rain/drizzle with the main rain just a little offshore.

Walt, do you know how the new Euro that was in parallel did? Looks like the upgrade tomorrow will be the biggest in a long time. It’s the first step toward the future convection permitting 4 to 5 km resolution.

 

We are pleased to confirm the operational implementation of IFS Cycle 47r3 with the   

   06 UTC run, 12 October 2021 

The upgrade will bring improvements to the assimilation and observations usage and a significantly improved physical basis for moist processes, necessary to facilitate further development of the Integrated Forecasting System (IFS) and future application at convection-permitting resolutions. The release candidate phase has been running in near real-time since 14 September. In a recent Webinar we explained the scientific background, its meteorological impact, and some new and revised products. Forecast users are recommended to read "47r3 Impact on Surface Weather representation", highlighting the changes with 47r3 in the characteristics of many frequently used forecast fields and products.

We would also like to remind you of a change to the “Master Tables Version Number”, affecting allparameters in GRIB 2, and encourage you to check your data processing with the test data provided as soon as possible ahead of implementation.

Detailed information can be found on the 47r3 implementation page. Please “watch” the page to get notified about further updates.     


 

https://confluence.ecmwf.int/display/FCST/47r3+Impact+on+Surface+Weather+representation

IFS cycle 47r3 is delivering noteworthy changes in the characteristics of many of the forecast fields (such as precipitation) and forecast products regularly used by forecasters and others. These changes are probably more substantial, as a whole, than anything we have seen with any ECMWF cycle in the last 10 years. This page aims to highlight the key differences.

It is common forecaster practice to adjust for perceived/known biases or weaknesses in model behaviour, and given the new characteristics application of these ("old") corrections to output from the new cycle may no longer be appropriate. Some such corrections can be discarded or toned down; other new ones may need to be introduced.

Most of the changes with 47r3 are attributable to the new "Moist Physics" package, affecting cloud and precipitation in particular. However changes to the visibility and gust diagnostics will also have a substantial impact on occasion.

Impacts are listed below, by parameter, with examples generally comparing output from cycle 47r2 (operational until 12 October 2021) and contiguous non-operational runs of 47r3 (operational from 12 October 2021). Unless stated otherwise examples are from HRES. "NEW CYCLE" on plots below means 47r3.

 

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4 hours ago, bluewave said:

Top 10 warmest first 10 days of October for several of our stations.

 

Time Series Summary for FARMINGDALE REPUBLIC AP, NY
Click column heading to sort ascending, click again to sort descending.
Rank
Ending Date
Mean Avg Temperature Oct 1 to Oct 10
Missing Count
1 2007-10-10 68.9 0
2 2018-10-10 67.7 0
3 2017-10-10 67.1 0
4 2005-10-10 66.2 0
5 2013-10-10 65.9 0
6 2021-10-10 64.6 0
7 2002-10-10 64.4 0
8 2020-10-10 62.0 0
9 2019-10-10 61.8 0
10 2016-10-10 61.5 2

 

Time Series Summary for ISLIP-LI MACARTHUR AP, NY
Click column heading to sort ascending, click again to sort descending.
Rank
Ending Date
Mean Avg Temperature Oct 1 to Oct 10
Missing Count
1 2007-10-10 68.5 0
2 2018-10-10 68.0 0
3 1990-10-10 66.7 0
4 2017-10-10 66.6 0
5 2013-10-10 65.6 0
6 2005-10-10 65.5 0
7 2021-10-10 63.7 0
8 2002-10-10 63.3 0
9 1995-10-10 63.2 0
10 1997-10-10 63.0 0
- 1983-10-10 63.0 0

 

Time Series Summary for NEWARK LIBERTY INTL AP, NJ
Click column heading to sort ascending, click again to sort descending.
Rank
Ending Date
Mean Avg Temperature Oct 1 to Oct 10
Missing Count
1 1959-10-10 72.4 0
2 2007-10-10 71.8 0
3 2018-10-10 69.6 0
4 2017-10-10 69.5 0
5 1990-10-10 68.8 0
6 1941-10-10 68.5 0
7 2013-10-10 67.2 0
8 2021-10-10 66.9 0
9 1973-10-10 66.7 0
10 1949-10-10 66.4 0

Is this the warmest even for JFK which reached 90 on 10/9/90 and 95 on 10/2 a few years ago?

 

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After the near record warmth this week, the EPS has closer to normal temperatures next week. This means NYC may finally drop below 50°. But it will be among the latest first 40s on record. Since the EPO remains very positive, temperature departures rebound for the last week of October.


Oct 11-18

0FB77A5E-5C52-4371-8D41-A41EA1A9B6EE.thumb.png.0538716bde6259085e4fe7e1d7f27673.png

 

Oct 18-25

 

0C57C415-86E7-4CD7-A8C6-A330284B9EDB.thumb.png.86399886bcd0a68bc3eda468fb8cc7a4.png

 

Oct 25-31

 

03910081-6208-4DE8-A8A9-388F9CE4AAD6.thumb.png.6fa7290717c5ece6f6be80235996995b.png

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4 hours ago, bluewave said:

Walt, do you know how the new Euro that was in parallel did? Looks like the upgrade tomorrow will be the biggest in a long time. It’s the first step toward the future convection permitting 4 to 5 km resolution.

 

We are pleased to confirm the operational implementation of IFS Cycle 47r3 with the   

   06 UTC run, 12 October 2021 

The upgrade will bring improvements to the assimilation and observations usage and a significantly improved physical basis for moist processes, necessary to facilitate further development of the Integrated Forecasting System (IFS) and future application at convection-permitting resolutions. The release candidate phase has been running in near real-time since 14 September. In a recent Webinar we explained the scientific background, its meteorological impact, and some new and revised products. Forecast users are recommended to read "47r3 Impact on Surface Weather representation", highlighting the changes with 47r3 in the characteristics of many frequently used forecast fields and products.

We would also like to remind you of a change to the “Master Tables Version Number”, affecting allparameters in GRIB 2, and encourage you to check your data processing with the test data provided as soon as possible ahead of implementation.

Detailed information can be found on the 47r3 implementation page. Please “watch” the page to get notified about further updates.     


 

https://confluence.ecmwf.int/display/FCST/47r3+Impact+on+Surface+Weather+representation

IFS cycle 47r3 is delivering noteworthy changes in the characteristics of many of the forecast fields (such as precipitation) and forecast products regularly used by forecasters and others. These changes are probably more substantial, as a whole, than anything we have seen with any ECMWF cycle in the last 10 years. This page aims to highlight the key differences.

It is common forecaster practice to adjust for perceived/known biases or weaknesses in model behaviour, and given the new characteristics application of these ("old") corrections to output from the new cycle may no longer be appropriate. Some such corrections can be discarded or toned down; other new ones may need to be introduced.

Most of the changes with 47r3 are attributable to the new "Moist Physics" package, affecting cloud and precipitation in particular. However changes to the visibility and gust diagnostics will also have a substantial impact on occasion.

Impacts are listed below, by parameter, with examples generally comparing output from cycle 47r2 (operational until 12 October 2021) and contiguous non-operational runs of 47r3 (operational from 12 October 2021). Unless stated otherwise examples are from HRES. "NEW CYCLE" on plots below means 47r3.

 

Have no access.  Monitoring for a marginal wind event Sat aft or night but far too early. Hopefully someone else answered.  

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Drier air moved into the region allowing for partly sunny skies and mild readings in the 70s. Newark reached 70° for the 165th time this year. As a result, 2021 is tied for 11th place with 1990 and 2017.

Tomorrow will likely be a similar day. Sunshine and much above normal temperatures are likely from mid-week into the start of the weekend. Overall, the generally warm regime will continue into weekend before a strong cold front ushers in cooler readings. In the wake of the frontal passage, readings will return to near normal levels.

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 +0.1°C and the Region 3.4 anomaly was -0.7°C for the week centered around October 6. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.08°C and the ENSO Region 3.4 anomaly has averaged -0.35°C. Neutral ENSO conditions will likely yield to La Niña conditions later this month.

The SOI was +2.32 today.

The preliminary Arctic Oscillation (AO) figure was -0.038 today.

On October 9 the MJO was in Phase 5 at an amplitude of 1.701 (RMM). The October 8-adjusted amplitude was 2.024 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 87% probability that New York City will have a warmer than normal October (1991-2020 normal). October will likely finish with a mean temperature near 61.8° (3.9° above normal).

 

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Morning thoughts…

It will be partly to mostly cloudy and milder. High temperatures will likely reach the upper 60s and lower 70s in most of the region. Likely high temperatures around the region include:

New York City (Central Park): 69°

Newark: 73°

Philadelphia: 72°

Normals:

New York City: 30-Year: 65.8°; 15-Year: 66.9°

Newark: 30-Year: 67.4°; 15-Year: 68.7°

Philadelphia: 30-Year: 68.7°; 15-Year: 69.6° 

A generally warmer than normal regime will continue into the weekend before a strong cold moves across the region.

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The next 8 days are averaging 68degs.(61/75), or +8.

Month to date is  65.2[+3.7].       Could be  66.3[+5.6] by the 20th.

Reached 77 here yesterday at 4:45pm.

Today:   73-76, e. wind, clouds.      Rain, up to 1" this weekend----then no more 70's?.

The GEFs Ext. has Oct. 18-Nov.03 as still with a small chance at 70.       Then from Nov.4-15 no chance at 70 and the Control hits near 32* on Nov. 09th., for the first time this season.

 

64*(85%RH) here at 6am.        70* at Noon.          72* at 3pm.       Only reached 73* around 5pm, despite good sun most of the PM.

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3 hours ago, LongBeachSurfFreak said:

On the positive side of things the extension of the growing season is pretty cool. M vegetable gardens are still producing nicely. Annuals stay healthy now well into November. Assuming we do not have one of those shock Arctic outbreaks. We went from full growing season to the teens in 18/19. 

An arctic shock is a definite possibility. We've seen an increase in brief Arctic pockets come and go. 

Something like that in 1st half of November wouldn't surprise me.

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12 minutes ago, SnoSki14 said:

An arctic shock is a definite possibility. We've seen an increase in brief Arctic pockets come and go. 

Something like that in 1st half of November wouldn't surprise me.

Weeklies have an abrupt pattern change in November. Let's see if it's right.

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