September 2025 OBS-Discussion centered NYC subforum

[SACRUS]

 

72 / 51 here ENW flow  Clouds movement is fun to watch today low level ENE to SSW and higher clouds SW to NE 

 

[steve392]

18 hours ago, Dark Star said:

Sorry, that is contradictory.  I laugh when I see people wearing sandals shorts, a coat and a winter ski hat.

It's all about comfort.  

[rclab]

12 hours ago, cleetussnow said:

Trynna picture what happened between the 2nd and third frame lol

 A fantastic gymnastic move. Pulling the hoodie over with her hands, jumping up and inserting her feet in the hood while still holding on, then flipping out of it. I was not skilled enough to capture the brief video (a grandchild wasn’t with me). The best I could do was the screen shots. The young lady was amazing. As always ….. 

[bluewave]

5 hours ago, TheClimateChanger said:

Yeah, but I follow A LOT of places. For the past decades/years, coop sites would routinely own all of the coldest statewide low temperatures. A lot of people referred to it as an "airport heat effect" but I'm seeing lots of airport sites now in the mix for coldest regional/state lows. They are doing WAY better when it comes to radiating heat away with these new sensors. I can see it with my own two eyes. I'm in the middle of the woods and the airport surrounded by concrete is routinely now seeing low temperatures as low as mine when it used to be several degrees hotter. That's not due to drought.

I haven’t heard any information suggesting that the new sensors being installed at the airports have an inherent cold bias during radiational cooling events.

The coldest temperature in NJ since late August wasn’t from an airport but at the Walpack ,NJ climate station. Plus KFOK which is at an airport has always been a great radiational cooling spot out in the Hamptons.

So very cold readings at airports which happen to located in great radiational cooling locations like the Pine Barrens with sandy soil have been a common occurrence long before the new sensors began to get rolled out. 
 

 

[donsutherland1]

Tomorrow will be variably cloudy with a few showers possible in places. Highs will top out mainly in the upper 60s. Thursday could be briefly warmer with highs in the upper 70s to perhaps lower 80s. 

A scattered shower or thundershower is possible Thursday night into Friday as a cold front pushes through.

September 1-15 is on track to achieve a solid cool anomaly. Since 2000, there have been nine years that saw a cooler than normal first half of September. Two-thirds of those years went on to record a warmer than normal second half of September. Only two of those years (2017 and 2019) wound up with a monthly mean temperature of 70.0° or above. Overall, for two-thirds of those years, the cool start was sufficiently cool to produce a cooler than normal monthly anomaly. The last year that saw both a cooler than normal first half and second half of September was 2009. Prior to that, it was 2001. The last year to record a cooler than normal first half of September followed by a warmer than normal September was 2024.

The ENSO Region 1+2 anomaly was -0.3°C and the Region 3.4 anomaly was -0.4°C for the week centered around August 27. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.33°C and the ENSO Region 3.4 anomaly has averaged -0.32°C. La Niña conditions will likely develop during mid- or late-autumn.

The SOI was -13.78 today. 

The preliminary Arctic Oscillation (AO) was +0.461 today. 

Based on sensitivity analysis applied to the latest guidance, there is an implied near 59% probability that New York City will have a cooler than normal September (1991-2020 normal). September will likely finish with a mean temperature near 68.3° (0.9° below normal). 

Supplemental Information: The projected mean would be 0.3° above the 1981-2010 normal monthly value.

 

[psv88]

77 today 

[winterwarlock]

76/45 my splits both Monday and Tuesday

[SACRUS]

 

76 today.  

[BobbyHolikWillFindYou]

3 hours ago, bluewave said:

I haven’t heard any information suggesting that the new sensors being installed at the airports have an inherent cold bias during radiational cooling events.

The coldest temperature in NJ since late August wasn’t from an airport but at the Walpack ,NJ climate station. Plus KFOK which is at an airport has always been a great radiational cooling spot out in the Hamptons.

So very cold readings at airports which happen to located in great radiational cooling locations like the Pine Barrens with sandy soil have been a common occurrence long before the new sensors began to get rolled out. 
 

 

Walpack at 36 is wild to me. Im 50 miles East and woke up to a balmy 55. The woods are a cold, cold place.

[mgerb]

1 hour ago, BobbyHolikWillFindYou said:

Walpack at 36 is wild to me. Im 50 miles East and woke up to a balmy 55. The woods are a cold, cold place.

It's also in a very low lying valley. Just perfect radiational cooling conditions there. 

https://www.njweather.org/station/79

[SnoSki14]

Looks quite warm overall next 10+ days outside a potential cutoff low. 

September could definitely sneak an AN anomaly despite the cool start.

[bluewave]

10 hours ago, BobbyHolikWillFindYou said:

Walpack at 36 is wild to me. Im 50 miles East and woke up to a balmy 55. The woods are a cold, cold place.

The Delaware Water Gap area is a beautiful part of NJ. It’s too bad we don’t have a continuous record there going back as long as some of the other Sussex County observing sites.

The Sussex airport has continuous records in August online going back to 2001. This August featured the lowest monthly reading of 43°. The old COOP which was nearby stoped posting data a few years ago. So it looks like it may have closed.

Both the COOP and airport were operational back in August 2006. The airport had a low of 45° and the COOP 46°. Prior to the airport readings going online back around 2001, the coldest August reading at the Sussex COOP was 34° back in 1965.

So if Walpack was 7° colder than the Sussex COOP back in 1965, then it could have fallen to around 27° in that much colder valley area than around the Sussex COOP and airport. 

Parts of NY and PA were also in the upper 20s during August 1965. That was the worst drought around the region in hundreds of years. 
 

Monthly Data for August 1965 for New Jersey
Click column heading to sort ascending, click again to sort descending.

NEWTON	COOP	34
SUSSEX 1 NW	COOP	34
CHARLOTTEBURG RESERVOIR	COOP	35
HIGH POINT PARK	COOP	35
BOONTON 1 SE	COOP	36
LAYTON 2	COOP	36
INDIAN MILLS 2 W	COOP	37
PEMBERTON	COOP	37
FLEMINGTON 5 NNW	COOP	37
LONG VALLEY	COOP	37
MORRIS PLAINS 1 W	COOP	37
TOMS RIVER	COOP	38
CHATSWORTH	COOP	39
ESSEX FELLS SERVICE BLDG	COOP	39
WANAQUE RAYMOND DAM	COOP	39
BELLEPLAIN STA FOREST	COOP	40
ATLANTIC CITY INTL AP	WBAN	40
HIGHTSTOWN 2 W	COOP	40
LAMBERTVILLE	COOP	40
NEW MONMOUTH	COOP	40
CANOE BROOK	COOP	40
BELVIDERE	COOP	40
Atlantic City Area	ThreadEx	40
Belvidere Area	ThreadEx	40
SOMERVILLE 4 NW	COOP	41

 

Monthly Data for August 1965 for New York
Click column heading to sort ascending, click again to sort descending.

ELIZABETHTOWN	COOP	26
SPECULATOR	COOP	27
ANGELICA	COOP	27
SLIDE MOUNTAIN	COOP	28
FRANKLINVILLE	COOP	28
ONEONTA 3 SE	COOP	29
ROXBURY	COOP	29

 

Monthly Data for August 1965 for Pennsylvania
Click column heading to sort ascending, click again to sort descending.

COUDERSPORT 4 NW	COOP	27
AUSTINBURG 2 W	COOP	28
KANE 1NNE	COOP	30
LAWRENCEVILLE 2 S	COOP	30
FRANCIS E WALTER DAM	COOP	31
ENGLISH CENTER	COOP	31
MILANVILLE	COOP	31
EAST STROUDSBURG	COOP	32
KARTHAUS (RIVER)	COOP	32
EMPORIUM 1 N	COOP	32
CLERMONT 8 SW	COOP	32
BRADFORD 4SW RES 5	COOP	32
TOBYHANNA POCONO MOUNTAIN ARPT	WBAN	32

[IrishRob17]

14 hours ago, bluewave said:

I haven’t heard any information suggesting that the new sensors being installed at the airports have an inherent cold bias during radiational cooling events.

The coldest temperature in NJ since late August wasn’t from an airport but at the Walpack ,NJ climate station. Plus KFOK which is at an airport has always been a great radiational cooling spot out in the Hamptons.

So very cold readings at airports which happen to located in great radiational cooling locations like the Pine Barrens with sandy soil have been a common occurrence long before the new sensors began to get rolled out. 
 

I looked for a bit the other day and was unsuccessful in trying to find a list of what sensors have been replaced. I’m interested in KMGJ right up the road. I found data on when the old equipment was installed, and it was old, but the file that was supposed to be an updated list of the replacement dates was blank. If you come across anything g please share, thanks.