September 2021

[bluewave]

Latest EPS continues the above normal temperatures into October.

9-13 to 9-20

 

9-20 to 9-27

 

9-27 to 10-04

[CIK62]

WE ARE WEDDED TO >>>>>  GLOBAL WARMING >>>>>> TILL 'HEAT DEATH' DO US PART...........................    Divorce Proceedings by the 29th?    lol

Do not forget this little dalliance from just last November:

2020-11-04	62	40	51.0	-0.6	14	0	0.00	0.0	0
2020-11-05	67	52	59.5	8.2	5	0	0.00	0.0	0
2020-11-06	70	56	63.0	12.0	2	0	0.00	0.0	0
2020-11-07	74	56	65.0	14.4	0	0	0.00	0.0	0
2020-11-08	75	56	65.5	15.2	0	1	0.00	0.0	0
2020-11-09	75	54	64.5	14.5	0	0	0.00	0.0	0
2020-11-10	74	60	67.0	17.3	0	2	0.00	0.0	0
2020-11-11	72	64	68.0	18.6	0	3	0.78	0.0	0
2020-11-12	68	46	57.0	7.9	8	0	0.24	0.0	0

[donsutherland1]

At 7:30 pm, an area of showers and thunderstorms stretched from south of Rochester to north of Williamsport. That area was heading east-southeastward. As a result, parts of the region could see a shower or thunderstorm tonight. The potential exists for any storms to be quite strong. Sunshine will return tomorrow and it will be a bit cooler than tomorrow.

The latest ensemble guidance has backed off the development of a sustained PNA- near or just after mid-September. A sustained PNA- typically sees a higher frequency of large rainfall (1" or more daily precipitation) in and around the New York City area during September.

A warm September outcome remains on track. Despite a cooler than normal first 7-10 days (for example, the 9/1-7 anomaly was -2.5° in New York City and the 9/1-10 anomaly was -1.6° in New York City), September will likely feature near normal to somewhat warmer than normal temperatures in much of the region. The second half of the month could feature above to perhaps much above normal temperatures. As a result, 2021 is increasingly likely to become the 6th out of the last 7 years during which September has had a mean temperature of 70° or above in New York City. Prior to 2000, New York City saw such warmth on average once every five years. In short, September has become more an extension of summer than a gateway to autumn in the New York City area.

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".

The ENSO Region 1+2 anomaly was -0.2°C and the Region 3.4 anomaly was -0.3°C for the week centered around September 8. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.22°C and the ENSO Region 3.4 anomaly has averaged -0.43°C. Neutral ENSO conditions will likely prevail through September. Afterward, La Niña conditions could begin to develop.

The SOI was +27.75 today.

The preliminary Arctic Oscillation (AO) figure was +0.849 today.

On September 11 the MJO was in Phase 3 at an amplitude of 1.417 (RMM). The September 10-adjusted amplitude was 1.303 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 78% probability that New York City will have a warmer than normal September (1991-2020 normal). September will likely finish with a mean temperature near 71.0° (1.8° above normal).

 

[donsutherland1]

2 hours ago, bluewave said:

Latest EPS continues the above normal temperatures into October.

9-13 to 9-20

 

9-20 to 9-27

 

9-27 to 10-04

Actually through much of October.

[WE GOT HIM]

4 minutes ago, donsutherland1 said:

Actually through much of October.

Can you post Alaska?

[WE GOT HIM]

[lee59]

2 hours ago, A Moonlit Sky said:

Yes, but it's lower than the average for each decade prior to the 2010s. Sea ice has declined decade over decade since at least the 1980s.

Yes it is not looking good in the Arctic. It is nice to see a glimmer of hope every once in a while. I don't expect it to continue, we shall see.

[donsutherland1]

23 minutes ago, user13 said:

Can you post Alaska?

Until the closing week of October, Alaska is generally colder than normal.

[SnoSki14]

33 minutes ago, donsutherland1 said:

Actually through much of October.

Atrocious foliage season. 

80s deep into October

[lee59]

Don't have to worry about a sea breeze putting a lid on the storms over Long Island tonight, there is none. 77 degrees here with little to no wind.

[donsutherland1]

13 minutes ago, SnoSki14 said:

Atrocious foliage season. 

80s deep into October

Let’s hope it changes. Certainly, a lot can change in forecasts 2 weeks or longer.

[SACRUS]

 

9/13

ACY: 88
EWR: 88
PHL: 88
BLM: 87
JFK: 87
New Brnswck: 86
LGA: 86
ISP: 85
TTN: 85
ISP: 84
NYC: 83

[Rock888]

Pretty intense lightning here, but we’re only on the northern fringe here in Queens. SI and Brooklyn look like they’re getting slammed. 

[Rtd208]

Decent storm moved thru here between 9:45-10:15 pm. Picked up 0.53" of rain.

[LibertyBell]

3 hours ago, donsutherland1 said:

Let’s hope it changes. Certainly, a lot can change in forecasts 2 weeks or longer.

we hit 95 a few years ago in October, it can't be as hot as that

 

[LibertyBell]

2 hours ago, SACRUS said:

 

9/13

ACY: 88
EWR: 88
PHL: 88
BLM: 87
JFK: 87
New Brnswck: 86
LGA: 86
ISP: 85
TTN: 85
ISP: 84
NYC: 83

NYC carrying the rear again

 

[donsutherland1]

Morning thoughts…

Today will be partly sunny. It will remain warm. High temperatures will likely reach the upper 70s and lower 80s in most of the region.  Central New Jersey southward will likely see readings in the middle and upper 80s. Likely high temperatures around the region include:

New York City (Central Park): 79°

Newark: 82°

Philadelphia: 86°

Normals:

New York City: 30-Year: 77.0°; 15-Year: 77.7°

Newark: 30-Year: 78.5°; 15-Year: 79.2°

Philadelphia: 30-Year: 79.7°; 15-Year: 80.2°

Generally warmer than normal weather will continue through the week.

[CIK62]

The next 8 days are averaging 77degs.(70/84), or +8.

Month to date is  71.3[-0.9].         Could be  73.3[+2.4] by the 22nd.

Should be in upper 70's today with variable wind directions and some clouds.

Reached 87 here yesterday.

70*(92%RH) here at 6am, dirty blue skies.        74*  at Noon.       77* at 4pm.          Reached 79* at 4:30pm.

 

[nyrangers1022]

How's Thursday looking?  Might take off for golf but afraid of it being drizzly and raw in-between showers 

[bluewave]

With Newark adding another 70° low yesterday, it’s getting closer to the all-time record.

Time Series Summary for NEWARK LIBERTY INTL AP, NJ - Jan through Dec
Click column heading to sort ascending, click again to sort descending.

Rank	Year	Number of Days Min Temperature >= 70	Missing Count
1	1973	62	0
2	2011	59	0
3	2005	58	0
4	2021	57	109
-	2020	57	0
-	2010	57	0
5	1993	55	0

[SACRUS]

The puppy days of late summer as we ride above normal overall into the longer range.  After today's cooldown Wed (9/15) looks to reach 90 , especially in the warmer spots in what will end a 2 + weeks period without 90s.  Beyond there  - warm and we watch cut off lows from the ridge producing onshore and keeping it warm but next shot at 90s would likely come Sat or Sun (pending on clouds and easterly flow). Nicholas remnants look aimed at GL/OV but at some point those storms and precip comes east.  ULL in the Atlantic nearby the coast as well.  So we have to see how much of the period 9/18 - 9/22 is clouds and onshore and potentially showery, rainy.

[donsutherland1]

8 hours ago, LibertyBell said:

we hit 95 a few years ago in October, it can't be as hot as that

 

That was the kind of extreme event that probably won’t recur for at least a few years.

[forkyfork]

sunny and upper 70s at 1030 am. another toothless backdoor front

[KEITH L.I]

1 hour ago, donsutherland1 said:

That was the kind of extreme event that probably won’t recur for at least a few years.

Warmer than normal temps in October are 70's and some low 80's. A way above normal day you might approach 90, however they are rare

[bluewave]

Another 80° day at Newark.

 

Time Series Summary for NEWARK LIBERTY INTL AP, NJ - Jan through Dec
Click column heading to sort ascending, click again to sort descending.

Rank	Year	Number of Days Max Temperature >= 80	Missing Count
1	2015	118	0
2	1994	114	0
3	2016	113	0
-	1993	113	0
-	1991	113	0
4	2011	111	0
-	2010	111	0
5	1959	108	0
6	2007	106	0
7	2005	105	0
8	2002	104	0
9	1990	103	0
-	1957	103	0
	2021	103	109

[guinness77]

1 hour ago, bluewave said:

Another 80° day at Newark.

 

Time Series Summary for NEWARK LIBERTY INTL AP, NJ - Jan through Dec
Click column heading to sort ascending, click again to sort descending.

Rank	Year	Number of Days Max Temperature >= 80	Missing Count
1	2015	118	0
2	1994	114	0
3	2016	113	0
-	1993	113	0
-	1991	113	0
4	2011	111	0
-	2010	111	0
5	1959	108	0
6	2007	106	0
7	2005	105	0
8	2002	104	0
9	1990	103	0
-	1957	103	0
	2021	103	109

8 of those 14 years are in the last 20 years…I’m sure that’s just a coincidence. 

 

[bluewave]

50 minutes ago, guinness77 said:

8 of those 14 years are in the last 20 years…I’m sure that’s just a coincidence. 

 

The other impressive 80° day statistic for Newark is how early the first 80° of the year has been arriving. The 2-21 -18 earliest is one of the more extreme high temperature records that our area has seen in recent years. 5 of the top 10 earliest have occurred since 2011. But the cooler recent Novembers relative to the rest of the fall hasn’t allowed any late 80° records to be challenged recently.

First/Last Summary for NEWARK LIBERTY INTL AP, NJ
Each section contains date and year of occurrence, value on that date.
Click column heading to sort ascending, click again to sort descending.

Year	First	Value	Last	Value	Difference
2018	02-21 (2018)	80	10-11 (2018)	81	231
2016	03-09 (2016)	82	10-19 (2016)	87	223
1990	03-13 (1990)	86	10-14 (1990)	83	214
1945	03-16 (1945)	81	10-19 (1945)	82	216
2011	03-18 (2011)	80	10-10 (2011)	85	205
2020	03-20 (2020)	80	09-28 (2020)	81	191
1938	03-22 (1938)	80	10-17 (1938)	90	208
2021	03-26 (2021)	84	-	-	-
1998	03-27 (1998)	84	09-27 (1998)	91	183
2007	03-27 (2007)	80	10-23 (2007)	80	209
1989	03-28 (1989)	83	10-16 (1989)	80	201

 

[doncat]

As far as 70+ degree mins so far... my station has recorded 39 days...record is 41 days last set last year, none so far in Sept.

[uncle W]

1962-65 had less than 20 days with a min of 70 or higher...only 8 in 1962...1992 had 14...the last time Central Park had less than 20...in the 1960's 30 or more would be a lot...now 30 is a low number...

[LibertyBell]

8 hours ago, donsutherland1 said:

That was the kind of extreme event that probably won’t recur for at least a few years.

I remember it affected at least the entire eastern half of the country.....it felt like the middle of summer.