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September 2019 General Discussions & Observations Thread


Rtd208
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3 hours ago, SACRUS said:

Last few  runs of the latest guidance (EPS especially) really building the ridge along the east coast once Humberto heads out.  Still not fully clear the extent and focus of the late seaosn / early fall heat but Sep 21 - Oct 1 looking very warm.

Seems like the trend since 2015 may prevail to start, but will it hold through November and beyond is the question.

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Just now, bluewave said:

Today is one of this perfectly clear days with no clouds anywhere near NYC. Big change from much of the last 19 months when there always seemed to be clouds popping up.

 

506552D8-B001-4E02-AE71-A2762761A238.jpeg.4d1233edcd321039a45ba347102a5612.jpeg

We rarely get pure blue skies anymore.  Last Fall it seemed like everyday featured clouds.

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6 hours ago, SACRUS said:

Last few  runs of the latest guidance (EPS especially) really building the ridge along the east coast once Humberto heads out.  Still not fully clear the extent and focus of the late seaosn / early fall heat but Sep 21 - Oct 1 looking very warm.

Latest Euro OP is just wow, EPS too. We could be talking 90s late September/early October.

The dry stretch will only enhance the heat.

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On 9/12/2019 at 11:51 AM, bluewave said:

The latest 90 at JFK was 10-8-07 with the 2nd on 9-24-17. The latest 100 was 8-27-48 with 8-20-83 coming in 2nd. But it’s possible 9-2-53 was last 100 since the JFK data is missing for that month.

1953 still stands as our greatest late season heatwave. One of the few heat records that the 2010’s couldn’t beat.

Data for NEWARK LIBERTY INTL AP, NJ
Click column heading to sort ascending, click again to sort descending.
Date
Max Temperature 
1953-08-24 90
1953-08-25 93
1953-08-26 91
1953-08-27 93
1953-08-28 100
1953-08-29 100
1953-08-30 100
1953-08-31 102
1953-09-01 96
1953-09-02 105
1953-09-03 94

its amazing that it was the longest heat wave and yet occurred so late in the season!

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Brilliant sunshine and crystal clear skies covered the New York City area today. Temperatures across the Middle Atlantic region ranged from the middle 70s to the lower 80s. By Friday, warmer air should push back into the region. Unseasonable warmth could prevail during the upcoming weekend.

Meanwhile, both in the Southeast and France, the fierce summer of 2019 raged on. Records in the Southeast included: Apalachicola, FL: 98° (new monthly record); Atlanta: 98°; Crestview, FL: 100° (tied monthly record); Montgomery, AL: 103°.

Records in France included: Aubenas: 94° (new monthly record); Brive: 90°; Carcassonne: 91°; Istres: 88°; and Nimes: 98° (new monthly record); and, Orange: 95°.

Nimes has now set 4 monthly high temperature marks this year: February: 76°; June: 112° (all-time record); July: 102°; and, September: 98°.

In terms of the Arctic, Arctic sea ice extent fell to 3.991 million square kilometers yesterday (JAXA). That assures 2019 of having the second lowest minimum extent on record. Only 2012 had a figure below 4 million square kilometers. In part due to the large-scale absence of sea ice near Alaska, Utqiagvik (formerly Barrow) is on course for what could become that city's warmest September on record. Through yesterday, that city had seen 83 consecutive days with above freezing temperatures, which is 15 days longer than the previous record.

The ENSO Region 1+2 anomaly was -1.3°C and the Region 3.4 anomaly was -0.3°C for the week centered around September 11. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.65°C and the ENSO Region 3.4 anomaly has averaged -0.03°C. There remains uncertainty about the ENSO evolution later this fall. Despite the guidance, the strong cooling in Region 1+2 indicates that the prospects for a neutral-cool ENSO during the winter have increased. Such a scenario may be somewhat more likely than not. That outcome could have significant winter season implications.

Since 1991 when weekly ENSO region data was available, six years have seen September record 2 or more weeks with -1.0°C or cooler weekly anomalies in Region 1+2: 1996, 1999, 2002, 2007, 2010, and 2017. 5/6 (83%) of those cases went on to feature warm December-February temperature anomalies in the Middle Atlantic and southern New England regions. 2002 had one such week ahead of what would evolve into an El Niño winter.

The SOI value was not available today.

Today, the preliminary Arctic Oscillation (AO) figure was -1.362. The AO is forecast to return to positive values in a week or less.

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 was 69.1° (69.8° after adjusting for ongoing warming) and 58.9° (59.6° adjusted) for September through November in New York City. The 1981-2010 baseline normal figures are 68.0° and 57.5° respectively. The majority of cases saw a warmer than normal September and all cases featured a warmer than normal fall.

Among those five cases, 2015 made a transition from predominantly negative AO values to predominantly positive ones during the fall. The combination of the AO's recent increase to the strongest positive values since April and some of the extended range guidance leave open a scenario where the AO is currently in the early stages of evolving to a predominantly positive regime. Such an outcome would also favor a warmer than normal fall and possible warm start to winter in the Middle Atlantic and southern New England regions. For now, this is merely a hypothetical discussion of one potential path toward winter. Many other variables are involved. The only idea that carries weight at this time is that the possible evolution reaffirms the longstanding signal for a warm fall.

Therefore, a warmer than normal September and fall appear likely. The potential for autumn 2019 to rank among the 30 warmest cases on record remains on the table. For New York City, that would translate into a September-November mean temperature of 58.8°. The latest EPS weekly data shows widespread warmth across the CONUS during October.

On September 16, the MJO was in Phase 8 at an amplitude of 1.075 (RMM). The September 15-adjusted amplitude was 0.905.

Based on sensitivity analysis applied to the latest guidance, the implied probability of New York City having a warmer than normal September is approximately 81% and the probability of a monthly mean temperature of 70.0° or above is 52%.

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9 hours ago, bluewave said:

Today is a perfectly clear day with no clouds anywhere near NYC. A rarity over the last 19 months when there always seemed to be clouds popping up.

 

506552D8-B001-4E02-AE71-A2762761A238.jpeg.4d1233edcd321039a45ba347102a5612.jpeg

I did a little loop up to Greenfield Mass and down to E Hampton CT then home. I spent the extra hour or so in the car on the way up and went through Pittsfield then up through the heart of the Berks because it was just so damned beautiful out I didn't have the heart to do a closed window Interstate run. It was absolutely gorgeous up there today with the leaves starting to turn and the red maples a deep dark ultra rich color. The late afternoon light down the valley on 91 was great but when we got to the quiet corner area it was sublime.

It's harvest season so the farm stands are overflowing with the bounty of a wet spring and a near perfect summer. I drive down the road snacking on grape tomatoes and fresh pears and peaches and ... and... mmm yummy fruits of the earth. 

Yup I had a good little road trip today :)

8 hours ago, Brian5671 said:

Low humidity really drying things out fast...grass burning here for the first time this growing season....

Mine dried out and gave up in early August. The little dribs and drab kept things more green than otherwise here but a lot of things stopped growing around then. My garden took a hardcore hiatus until about 10 days ago when it woke up again. I've got peppers popping, tomatoes going wild and the lettuce found a second life altogether. Other than entirely too moist from mid Feb to mid June this hasn't been a bad year at all compared to '18.

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The next 8 days are averaging 70degs., or about 4degs. AN.   Used 70/57 for today.

Month to date is  +0.3[70.7].         Should be about +1.3[70.6] by the 25th.

63.6* here at 6am.     69.0* by 2pm, with sun in and out behind cumulus clouds.

Next 15 days look "El Boro", like watching grass grow---but it won't---not with just  0.10" rain.   Taken literally, we would finish under 1.0" for the month (last time is Mar. 2012?)

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13 hours ago, LibertyBell said:

its amazing that it was the longest heat wave and yet occurred so late in the season!

1988 actually beat it for duration it with 20 consecutive days reaching 90. But 1953 still stands as our greatest late season heatwave. This decade has been so wet, that those 2 records remained out of reach. Really need extreme drought over the Central or Eastern US  to get such a long heatwave. 

Number of Consecutive Days Max Temperature >= 90 
for NEWARK LIBERTY INTL AP, NJ
Click column heading to sort ascending, click again to sort descending.
Rank
Run Length
Ending Date
Period of record: 1931-01-01 to 2019-09-17
1 20 1988-08-17
2 14 2010-07-29
3 12 1995-08-04
- 12 1972-07-25
4 11 2012-07-08
- 11 1973-09-05
- 11 1953-09-03
5 10 2006-08-05
- 10 2002-08-19
- 10 1993-07-16

9B09339C-455D-4499-B8A7-CC30D8441EB1.gif.2a78973453105b555428ccf144a299d9.gif

 

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Swells from Humberto were increasing this morning and should peak Friday with some 8 foot waves. It should rival Dorian in size as Humberto has a huge wind field this morning. The swell being generated now will arrive then as it’s takes time to travel.

thats really the only interesting thing going on weather wise. I’m sure everyone’s sick of hearing me complain about having to water!!

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37 minutes ago, LongBeachSurfFreak said:

Swells from Humberto were increasing this morning and should peak Friday with some 8 foot waves. It should rival Dorian in size as Humberto has a huge wind field this morning. The swell being generated now will arrive then as it’s takes time to travel.

thats really the only interesting thing going on weather wise. I’m sure everyone’s sick of hearing me complain about having to water!!

Not really L.B. That does, however, depend, on how and where you do it. As always .....

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I don’t get all the complaining about the wx

This month has been perfect thus far. Mild days, cool nights, humidity in check, some cold, some hot, lots of sun.

We so infrequently get this in New York… I can’t understand why anybody that likes weather hasn’t liked this weather

69F.  47% Humidity

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27 minutes ago, jfklganyc said:

I don’t get all the complaining about the wx

This month has been perfect thus far. Mild days, cool nights, humidity in check, some cold, some hot, lots of sun.

We so infrequently get this in New York… I can’t understand why anybody that likes weather hasn’t liked this weather

69F.  47% Humidity

it's awsome-it's just boring from a weather enthusiast's point of view.     No Cat 5 headed for NYC or even rain showers.....

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1 hour ago, jfklganyc said:

I don’t get all the complaining about the wx

This month has been perfect thus far. Mild days, cool nights, humidity in check, some cold, some hot, lots of sun.

We so infrequently get this in New York… I can’t understand why anybody that likes weather hasn’t liked this weather

69F.  47% Humidity

Well for all the heat talk the first 20 days of September will average close to normal.

Euro Op relinquished some of the excess ridging too. It tries to build a -NAO

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