September 2025 OBS-Discussion centered NYC subforum

[nycwinter]

perfect hoodie day where you can go outside even in bright sunshine and feel cool.

[steve392]

25 minutes ago, nycwinter said:

perfect hoodie day where you can go outside even in bright sunshine and feel cool.

Shorts and hoodie weather!

 

[Sundog]

1 hour ago, FPizz said:

https://www.weather.gov/asos/CurrentEvents.html

Though I'm told from Tony Gigi when I asked about the qc process, that they only qc the instruments, not the environment around them.  Hence I guess why NYC is determined to be fine, since all the instruments are in correct working order.

Wait are you talking about Antonio Riggi or is Tony Gigi someone else? 

[FPizz]

41 minutes ago, Sundog said:

Wait are you talking about Antonio Riggi or is Tony Gigi someone else? 

Tony Gigi was Rainshadow on here years ago (pretty sure he was on here) and he works for Mt Holly.  He frequently speaks about Philly's temps being too high, so I asked him about the QC process of these sites.  Above is what he told me about the process.  It actually seems pretty infuriating what they take into account about the instruments vs what is around them, but, makes sense why they never fix NYC.  

[lee59]

Frost advisory for the Catskills

[wdrag]

3 hours ago, FPizz said:

https://www.weather.gov/asos/CurrentEvents.html

Though I'm told from Tony Gigi when I asked about the qc process, that they only qc the instruments, not the environment around them.  Hence I guess why NYC is determined to be fine, since all the instruments are in correct working order.

Thank you...  one thing I didnt see but the data may be inconsequential?  Are the new sensors reading slightly cooler when side by side with the replaced 20 year old sensors?

[donsutherland1]

Much of the region saw its chilliest morning so far this season. Low temperatures included:

Binghamton: 44°
Bridgeport: 50°
Caldwell: 49°
Danbury: 44°
Farmingdale: 55°
Hartford: 45°
Islip: 58°
Montgomery: 43°
New Haven: 50°
New York City-Central Park: 56°
New York City-JFK Airport: 56°
New York City-LaGuardia Airport: 60°
Newark: 55°
Philadelphia: 56°
Poughkeepsie: 44°
Trenton: 51°
White Plains: 49° (earliest season first 40s since 2001)

Temperatures will mainly top out in the 70s during the daytime and fall into the 50s at nighttime in New York City through at least Wednesday. Thursday could be briefly warmer with highs in the upper 70s to perhaps lower 80s. 

A shower or thundershower is possible on Wednesday as warm front moves across the region and Thursday as a cold front pushes through.

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 +0.06 today. 

The preliminary Arctic Oscillation (AO) was +0.073 today. 

Based on sensitivity analysis applied to the latest guidance, there is an implied near 61% probability that New York City will have a cooler than normal September (1991-2020 normal). September will likely finish with a mean temperature near 68.1° (1.1° below normal). 

Supplemental Information: The projected mean would be 0.1° above the 1981-2010 normal monthly value.

 

[Sundog]

1 hour ago, FPizz said:

Tony Gigi was Rainshadow on here years ago (pretty sure he was on here) and he works for Mt Holly.  He frequently speaks about Philly's temps being too high, so I asked him about the QC process of these sites.  Above is what he told me about the process.  It actually seems pretty infuriating what they take into account about the instruments vs what is around them, but, makes sense why they never fix NYC.  

Yea I remember rainshadow, though I never knew his name. 

I thought you were maybe talking about Tony Riggi and you made a typo, it's like one letter difference lol

Antonio Riggi helped me out like 14 years ago with creating long length radar loops of past storms using archived radar data. He's at Weatherbell now. 

 

 

[Stormlover74]

3 hours ago, steve392 said:

What kind of winter did that year have?

<10" of snow. Southern mid Atlantic did well 

[steve392]

14 minutes ago, Stormlover74 said:

<10" of snow. Southern mid Atlantic did well 

2001/2002 was that bad, jeesh.  02/03 was that epic winter, correct?

[Stormlover74]

24 minutes ago, steve392 said:

2001/2002 was that bad, jeesh.  02/03 was that epic winter, correct?

Yep

[Dark Star]

3 hours ago, steve392 said:

Shorts and hoodie weather!

 

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

[IrishRob17]

Just now, Dark Star said:

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

I'm trying to figure out how one wears a hoodie while the sun is out this time of year. If you're out after dark or perhaps around dawn, sure whatever but during the daytime?  To each their own but my hoodies are still enjoying their long warm season nap. After a low of 45 this morning, I know Forky is curious, and a high of 72 down to 62 now. 

[anthonymm]

2 hours ago, IrishRob17 said:

I'm trying to figure out how one wears a hoodie while the sun is out this time of year. If you're out after dark or perhaps around dawn, sure whatever but during the daytime?  To each their own but my hoodies are still enjoying their long warm season nap. After a low of 45 this morning, I know Forky is curious, and a high of 72 down to 62 now. 

Yea I dont get wearing hoodies when the sun is still this strong and the daytime temps are in the 70s. Hoodies are a mid to late october thing

[rclab]

3 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.

 

3 hours ago, IrishRob17 said:

I'm trying to figure out how one wears a hoodie while the sun is out this time of year. If you're out after dark or perhaps around dawn, sure whatever but during the daytime?  To each their own but my hoodies are still enjoying their long warm season nap. After a low of 45 this morning, I know Forky is curious, and a high of 72 down to 62 now. 

 

49 minutes ago, anthonymm said:

Yea I dont get wearing hoodies when the sun is still this strong and the daytime temps are in the 70s. Hoodies are a mid to late october thing

Thankfully there are exceptions. As always ……

 

[nycwinter]

2 hours ago, anthonymm said:

Yea I dont get wearing hoodies when the sun is still this strong and the daytime temps are in the 70s. Hoodies are a mid to late october thing

was in the 50's in nyc this morning where 90% of the people i saw was wearing one or a hooded sweatshirt..and tomorrow morning will be exactly the same..

[cleetussnow]

2 hours ago, rclab said:

 

 

Thankfully there are exceptions. As always ……

 

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

[bluewave]

Dry conditions snd high pressure really allowing the radiational cooling to overperform during recent weeks. So the low temperature departures have been more impressive. Also helps the high temperatures beat guidance at times.
 

[lee59]

53 here this morning, plenty of 30s in the Catskills area. The coldest I saw is 30 degrees in Saranac  Lake NY.

[jm1220]

Down to 50 here.

[uofmiami]

48.6 in Muttontown & 50.6 in Syosset this morning. 

[SACRUS]

 

 

61 / 53 clear.   Clouds offshore inching NW over the day into tomorrow otherwise partly cloudy - sunny with NE flow keeping highs in the low - mid 70s.   Some of the offshore rains may penetrate tomorrow with the euro the wettest.  Clears out and warm up Thu to the upper 70s to low 80s. Overall drier / near normal through the 14th with an overall ridging warmer by the 15th and beyond.

 

[SACRUS]

Highs:

EWR: 94 (1964) 
NYC: 94 (1915)
LGA: 93 (2016)
JFK: 93 (1959)


Lows:

EWR: 48 (1938)
NYC: 48 (1883)
LGA: 53 (1956)
JFK: 51 (1986)

Historical:

1775: The Independence Hurricane slammed into Halifax, Nova Scotia, Canada. Many ships were sunk and buildings demolished. 4,000 people died in what is considered to be Canada's deadliest hurricane disaster. 

 

1821: A tornadic outbreak affected the New England states of Massachusetts, New Hampshire, and Vermont on this day. Five tornadoes reportedly touched down from this event. One storm in New Hampshire had a path width of a half mile and tracked an estimated 23 miles. This tornado killed at least six individuals, which could be the deadliest tornado in New Hampshire history. 

1881: For the first time in 33 days, rain fell at Washington, DC. (Ref. for 33 day drought in 1881 )

1889: A hurricane that formed east of the Antilles moved north and then northward toward New Jersey. The storm came within 150 miles of Atlantic City, NJ before becoming nearly stationary for 4 days. The storm, one of the greatest storms to affect the shore and ocean, then turned to the southwest toward Norfolk, VA, and dissipated. Atlantic City measured a gust to 100 mph on the 10th. At Philadelphia, PA, rain began on the 10th. This began a period of 12 consecutive days of measurable rain, with a final total of 3.70 inches. Another sudden and damaging storm surge hit Long Island, NY and the Jersey shore during the evening on the 10th, following the 1st surge that hit on the 8th. The storm was located south of Cape Cod and east of Norfolk, VA, when the surge moved in. 29 ships were sunk in the Delaware Bay, killing at least 31 sailors. Officially, 40 lives were lost attributed to this hurricane. (Ref. Wilson Wx. History)

1919: 300 lives were lost mostly in ships near Key West, where winds were reported at 110 mph as a violent hurricane caused considerable damage. Brick structures had walls blown out and large vessels were torn from their moorings and blown on banks. A tornado destroyed six buildings and damaged 19, injuring six people at Goulds in Dade County. This hurricane killed hundreds more on its track to south Texas. The final death toll of over 600 was mostly in ships at seas. (Ref. Wilson Wx. History)

1921 - A dying tropical depression unloaded 38.2 inches of rain upon the town of Thrall in southeastern Texas killing 224 persons. 36.4 inches fell in 18 hours. (David Ludlum) (The Weather Channel)

1944 - The ""Great Atlantic Hurricane"" ravaged the east coast. The storm killed 22 persons and caused 63 million dollars damage in the Chesapeake Bay area, then besieged New England killing 390 persons and causing another 100 million dollars damage. (The Weather Channel)

1960: Extremely dangerous Category 4 Hurricane Donna was taking aim on the Florida Keys for the first of her four U.S. landfalls. On this date, Donnas’ winds peaked at 150 mph with a minimum central pressure of 934 millibars or 27.58 inches of mercury. (Ref. Wilson Wx. History)

1964: Hurricane Dora, the first storm of hurricane intensity to cross into northeast Florida from the Atlantic in 80 years of record keeping, moved inland over St. Augustine early on the 10th. St. Augustine was in the eye of the storm and recorded a sea level pressure of 966 millibars or 28.52 inches of mercury. Dora produced sustained winds of around 100 mph, and abnormally high tides to almost all coastal points north of Daytona Beach. Highest sustained winds, from the southwest, and estimated at 125 mph were reported at St. Augustine. Sustained winds of 82 mph were recorded in Jacksonville, and this was the first time in Weather Bureau history that winds of full hurricane force have been observed in Jacksonville. Storm tides reached 12 feet at St. Augustine and ranged between 5 and l0 feet above normal north of Daytona Beach. High winds in the Jacksonville area caused a massive utilities failure. One death and 8 injuries were reported from Dora. (Ref. AccWeather Weather History)
 

 

1965: Hurricane Betsy slammed into New Orleans on the evening of September 9, 1965. 110 mph winds and power failures were reported in New Orleans. The eye of the storm passed to the southwest of New Orleans on a northwesterly track. The northern and western eyewalls covered Southeast Louisiana and the New Orleans area from about 8 PM until 4 AM the next morning. In Thibodaux, winds of 130 mph to 140 mph were reported. The Baton Rouge weather bureau operated under auxiliary power, without telephone communication.

 

1971 - Hurricane Ginger formed, and remained a hurricane until the 5th of October. The 27 day life span was the longest of record for any hurricane in the North Atlantic Ocean. (The Weather Channel)

1976: Record rains that started on this day and ended on the 12th came from Tropical Storm Kathleen (called a 160+ year event by Meteorologists). 14.76 inches fell on south slopes of Mt. San Gorgonio, 10.13 inches at Mt. Laguna, 8 inches at Mt. San Jacinto, Over 4 inches in the Little San Bernardino Mountains, and 1.8 to 2.8 inches in the Coachella Valley. Deep Canyon (above La Quinta) recorded 2.96 inches in three hours on the 10th. Rainfall in the Santa Rosa Mountains above the Coachella Valley was called the “heaviest in recorded history.” Six were buried and killed in sand in Ocotillo. (Ref. Wilson Wx. History)

1983: On this date through the 10th, strong winds blasted through east central South Dakota, leaving in its wake damaged crops, hundreds of downed trees, broken windows, damaged roofs and buildings, downed power poles, and damaged vehicles. Gusts of up to 75 mph in Huron moved a semi trailer one-half block into a truck. Standing crops of corn, beans, and sunflowers suffered extensive damage in many areas with losses up to 50% reported. (Ref. Wilson Wx. History)

1986: An F-16 fighter jet had its windshield cracked by hail on its return to the Eagle Range Training Grounds near UT’s Great Salt Lake. A lightning bolt caused a hole 6 inches deep and 6 inches wide on a runway at the Salt Lake Int’l Airport. (Ref. Weather Guide Calendar with Phenomenal Weather Events 2011 Accord Pub. 2010, USA)
 

1987 - Thunderstorms produced severe weather in the central U.S. Thunderstorms in West Texas spawned four tornadoes in the vicinity of Lubbock, and produced baseball size hail and wind gusts to 81 mph at Ropesville. Thunderstorms produced hail two inches in diameter at Downs KS and Harvard NE, breaking car windows at Harvard. (The National Weather Summary) (Storm Data)

1988 - Florence became a hurricane and headed for the Central Gulf Coast Region. Florence made landfall early the next morning, passing over New Orleans LA. Winds gusts to 80 mph were recorded at an oil rig south of the Chandeleur Islands. Wind gusts around New Orleans reached 61 mph. Total property damage from Florence was estimated at 2.5 million dollars. (Storm Data) (The National Weather Summary)

1989 - The first snow of the season began to whiten the mountains of Wyoming early in the morning, as for two days a moist and unusually cold storm system affected the state. By the morning of the 11th, a foot of snow covered the ground at Burgess Junction. Thunderstorms developing along a cold front crossing the Ohio Valley produced severe weather in Indiana during the late afternoon and early evening hours. Strong thunderstorm winds blew down a tent at Palestine injuring seven persons, and frequent lightning interrupted the Purdue and Miami of Ohio football game, clearing the stands. (The National Weather Summary) (Storm Data)

1994: Glasgow, Montana: Temperature rises from 67°F at 5:02 AM to 97°F by 5:17 am. Heat burst is short-lived as temperature drops to 68°F by 5:40 AM the next morning. (Ref. WxDoctor) Hurricane John became extratropical in the north central Pacific Ocean, ending its 31-day life span as a tropical cyclone, the longest lived storm on record. (Ref. Wilson Wx. History)

2004: Western and central New York was inundated by drenching rains as the remnants of hurricane Frances drifted north. Area-wide rainfall totaled 3 to 5 inches with the bulk of it falling in a 6 to 9 hour period from very late on this date into the next day. At least one person was killed. Across the border, heavy rains of close to 4 inches over southern Quebec Canada. (Ref. Wilson Wx. History)

2008: Nome, AK reached a high temperature of 62°, which tied the high temperature record for the date and represented the third day during the month that a high temperature record was either tied or broken. (Ref. Wilson Wx. History)



2011: The remnants of Lee that was a very slow moving low pressure over Ohio has now been absorbed into the circulation a low over illinois and is expected to weaken through Saturday morning. The heavy rains over the Mid-Atlantic have diminished in coverage and are now limited to central and eastern Pennsylvania. Rainfall totals for VA- Colonial Beach 1.2 SSE 20.96, Woodbridge 0.5 SSW 16.20, Lorton 1.2 NE 15.09, Fort Belvoir/Davison AFB 13.77, Reston 2 N 11.45, Chantilly 2 ESE 10.18, Quantico MCAF 9.01, Copper Hill 6.2 S 8.89, Washington National 6.90, Richmond Byrd Field 6.06 Inches. (Ref. Rainfall Totals for 20 Other States - NWS Hydrometeorological Prediction Center Camp Springs, MD) Rich Hanauer lives in Furlong PA, between Philadelphia and Trenton NJ. Buckingham, PA (In this article) is just north of Philadelphia that had 24.71 inches of rain from Aug. 1st to today. (Ref. Newspaper Article from PA on flooding ) (Ref. Map of Rainfall Totals for VA from Sep. 5th to 9th)

 

2013: Historical rainfall occurred in northern Colorado from September 9 to September 16 and resulted in severe flash flooding along the northern Front Range of Colorado and subsequent river flooding downstream along the S

 

2017: Hurricane Irma was downgraded to a Category 3 storm shortly before noon Saturday after its maximum sustained winds weakened to 125 mph, but it was expected to strengthen before moving toward southwest Florida on Sunday. The National Hurricane Center said Irma was continuing to slam the north coast of Cuba Saturday but had weakened slightly. As of 2:00 p.m. EDT, the storm was located about 145 miles southeast of Key West, Fla.

 

[SACRUS]

 

 

Ridge building down by mid month and beyond should even out a cooler first half of the month with a much warmer second half, still a tendency of onshore but flow should come around to N/S W over time progressing between the 15 - 18

 

 

[donsutherland1]

White Plains recorded a low of 53° this morning, its second consecutive day with a low of 53° or below. 2025 has now seen two stretches of at least two consecutive lows of 53° or below through September 9th (August 30-31 and September 8-9). The last time that happened was in 2017 (September 1-2 and September 8-9). Since August 1, White Plains has had 20 days with lows of 59° or below. That is the most since 1994 and tied with 1962 and 1987 for the fourth most.

Most Days with Lows < 60° (August 1-September 9):

1. 22, 1964 and 1994
3. 21, 1957
4. 20, 1962, 1987, 2025
7. 19, 1982
8. 18, 1986
9. 17, 1972, 1988, 1997

[psv88]

50.8. New spot on this hill doesn’t radiate as well as the old house which was in a lower lying area. 

[bluewave]

57 minutes ago, donsutherland1 said:

White Plains recorded a low of 53° this morning, its second consecutive day with a low of 53° or below. 2025 has now seen two stretches of at least two consecutive lows of 53° or below through September 9th (August 30-31 and September 8-9). The last time that happened was in 2017 (September 1-2 and September 8-9). Since August 1, White Plains has had 20 days with lows of 59° or below. That is the most since 1994 and tied with 1962 and 1987 for the fourth most.

Most Days with Lows < 60° (August 1-September 9):

1. 22, 1964 and 1994
3. 21, 1957
4. 20, 1962, 1987, 2025
7. 19, 1982
8. 18, 1986
9. 17, 1972, 1988, 1997

Going from the 2nd highest number of hours above a 70° dewpoint in July to the most hours below 60° in August made all the difference.

 

[Sundog]

48 minutes ago, psv88 said:

50.8. New spot on this hill doesn’t radiate as well as the old house which was in a lower lying area. 

Crazy, I got to 54 degrees in Queens, only 3 degrees warmer than you 

[psv88]

21 minutes ago, Sundog said:

Crazy, I got to 54 degrees in Queens, only 3 degrees warmer than you 

Yes, the wind stays up on the hill a bit. I radiate very quickly after dark but at some point before dawn the wind creeps up 

[TheClimateChanger]

On 9/8/2025 at 10:45 AM, bluewave said:

The record ridge and drought in Canada generated strong high pressure and low dewpoints. This was followed up by the record trough over the Western Great Lakes ago. These very cold early season temperatures are actually being driven by the minimums allowing ideal early fall radiational cooling. 

We should continue with the comfortable early fall temperatures here right into mid-September as Canadian high pressure dominates. 

But much the CONUS is experiencing expanding drought conditions. So we could see a drought feedback warm up beginning to west while we enjoy the great early fall weather here.

Unfortunately, the reliable models only go out 15 days. So the pattern from late September into October will depend on the pattern evolution.

If we start getting more high pressure to our SW, then that drought feedback warmth could arrive here later September into October.

Statistically we don’t see much 90° heat here at the warm spots like Newark that late in the season. We haven’t seen any 90° heat at these locations after September 20th since 2017 and 2019. 

But  you never know if this will be the first 2020s year to pull it off. Especially if the winds can turn more SW. 

The big theme here in recent years has been record 80s warmth right into late October and early November like last year. 
 

 

 

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.