June 2021

[donsutherland1]

1 minute ago, mjr said:

Nantucket is more likely to see such temperatures than Central Park.

Seriously, would not be surprised if many stations in New England end the season with more 90s than NYC. They have a good head start.

Boston added another 90-degree day today. Central Park peaked at 89.

[jm1220]

13 minutes ago, donsutherland1 said:

Boston added another 90-degree day today. Central Park peaked at 89.

That's just hysterical. No way they were under 90 when even here it made it to 90 and even over in some places. 

[nycwinter]

7 minutes ago, jm1220 said:

That's just hysterical. No way they were under 90 when even here it made it to 90 and even over in some places. 

a lot of rain in central park lately prevented 90 degree heat today.

[psv88]

Just now, nycwinter said:

a lot of rain in central park lately prevented 90 degree heat today.

So you’re saying it only rained in Central Park yesterday? Nowhere else? 

[mjr]

9 minutes ago, psv88 said:

So you’re saying it only rained in Central Park yesterday? Nowhere else? 

NYC was doing ok up to 2pm, generally keeping up with most other stations. No appreciable effect of the rain yesterday. 

Then, all of a sudden, it basically flatlines while other locations add 2-4 degrees more. This happens very frequently even with no sea breeze. It cannot take advantage of mid or late afternoon temperature increases. It seems likely that it because of deprivation of sun after about 2pm. 

[donsutherland1]

It’s again 89 in Central Park. Maybe the thermometer can sneak to 90 now that the sun may not be impaired as much by the thick tree cover.

[donsutherland1]

29 minutes ago, jm1220 said:

That's just hysterical. No way they were under 90 when even here it made it to 90 and even over in some places. 

It’s back up to 89. Maybe it can hit 90.

[mjr]

Just now, donsutherland1 said:

It’s back up to 89. Maybe it can hit 90.

Hope so.

This midafternoon flatline effect occurs too often to just be a coincidence.

[Rjay]

3 minutes ago, mjr said:

Hope so.

This midafternoon flatline effect occurs too often to just be a coincidence.

I hope they never hit 90 and Newark hits 90 thirty+ times so they're forced to do something about the situation. 

[donsutherland1]

8 minutes ago, mjr said:

Hope so.

This midafternoon flatline effect occurs too often to just be a coincidence.

It’s the thick tree cover. 

[dWave]

19 minutes ago, mjr said:

NYC was doing ok up to 2pm, generally keeping up with most other stations. No appreciable effect of the rain yesterday. 

Then, all of a sudden, it basically flatlines while other locations add 2-4 degrees more. This happens very frequently even with no sea breeze. It cannot take advantage of mid or late afternoon temperature increases. It seems likely that it because of deprivation of sun after about 2pm. 

Yup always does that. Sometimes it jump up again late afternoon as the sun clears the trees, but varies with the changing sun angle during summer. 

Every mesonet, micronet in and near NYC was low to mid 90s. They are not all perfect, but with 90s so widespread its ridiculous the Park cant manage to touch 90. 

[bluewave]

https://www.weather.gov/coop/sitingpolicy2

Proper Siting

The Coop network has provided climate and weather data for over 100 years. Consistency of the measurements is an attribute of the network, and it has been maintained by rare and/or gradual change, and established standards for exposure, of instruments over the life of the network. In order to preserve the integrity of the network, NWS has established standards for equipment, siting, and exposure.

Temperature sensor siting: 

Do not install the sensor on a steep slope or in a sheltered hollow unless it is typical of the area or unless data from that type of site are desired. When possible, the shelter should be no closer than four times the height of any obstruction (tree, fence, building, etc.).

 

4 Air temperature
Air temperature is temperature of the free air conditions surrounding the station at a height between 4 and 6 feet above ground level. The air should be freely exposed to sunshine and wind and not close to or shielded by trees, buildings, or other obstructions.
 

http://www.weather2000.com/ASOS/NYC_ASOS.html
 

Most recent photo of the NYC ASOS taken in 2013 showing the trees shielding the temperature sensor

https://www.ncdc.noaa.gov/cdo-web/datasets/GHCND/stations/GHCND:USW00094728/detail

Obstruction Descriptions

OBSTRUCTIONS	BEGIN DATE¹	END DATE¹
TREES	2021-04-06	Present
TREES	2017-08-01	2021-04-06
TREE 020-340 deg 25-25 ft 20-54 deg	2016-06-15	2017-08-01
HYGR 090/4 TREES ENCIRLCE/25/20-54 IN FENCED ENCOLSURE 50 FT X 25 TH	1995-06-27	2016-06-15
UNIV 050/4 CRS 180/9 H083 SENSOR 200/8 TB 220/20 TREES ENCIRCLE/25/20-54 EQUIPMENT IN FENCED ENCLOSURE 50 FEET X 25 FEET	1992-01-01	1995-06-27

[donsutherland1]

21 minutes ago, mjr said:

Hope so.

This midafternoon flatline effect occurs too often to just be a coincidence.

It’s worth reposting these numbers:

Changes in Summer (June-August) Average High Temperatures (1971-00 vs. 1991-20 Means):

Bridgeport: +0.9°
Islip: +1.3°
New Brunswick: +1.4°
New York City-JFK: +1.0°
New York City-LGA: +1.6°
Newark: +0.8°
Poughkeepsie: +1.1°
White Plains: +1.0°

Average: +1.1°
Median: +1.1°
Standard Deviation: +0.3°

Trimmed Mean (excluding the highest and lowest changes): +1.1°
Second Trimmed Mean (excluding the two highest and lowest changes): +1.1°

New York City-Central Park: -0.1° (more than 3 sigma below the regional change excluding Central Park)

Note: The tree obstructions at Central Park were noted beginning in 1992

[Byrdhousebv]

Topped off at 92.8 this afternoon in NE Monmouth Co. With a westerly wind most of the day, even the beach was in the mid 80's. Had to leave before any sea breeze developed.   

[CIK62]

Looked like this near peak T's around here, 4:15pm.         I played catch up here,  and reached 91 at 6pm, nearly two hours after I had left the beach:

More fun and games?        Gonna be a setback for sure and then another HW???

[Cfa]

I’d trust a PWS with decent siting more before I’d trust anything coming out of KNYC.

[Stormlover74]

51 minutes ago, Rjay said:

I hope they never hit 90 and Newark hits 90 thirty+ times so they're forced to do something about the situation. 

Please no but we'll probably get there by July 31st 

[jm1220]

1 hour ago, mjr said:

Hope so.

This midafternoon flatline effect occurs too often to just be a coincidence.

It’ll be even more hilarious when on Tue the media goes with “no heat wave in NYC” because of Central Park’s low readings. To add to the choir here, something needs to be done about it. 

[Intensewind002]

Hit 88 for the high here, around 2 pm

[donsutherland1]

21 minutes ago, jm1220 said:

It’ll be even more hilarious when on Tue the media goes with “no heat wave in NYC” because of Central Park’s low readings. To add to the choir here, something needs to be done about it. 

The Conservatory won’t deal with the problem. However, it has acted in other cases when there were hanging limbs, so it has the capacity to do what is needed.

[uofmiami]

90 in Muttontown & Syosset today. 

[etudiant]

20 minutes ago, donsutherland1 said:

The Conservatory won’t deal with the problem. However, it has acted in other cases when there were hanging limbs, so it has the capacity to do what is needed.

Afaik, the Conservancy only acts if there is a danger to people, but otherwise prefers to let nature do its own thing.

So even if the weather station gets smothered by the surrounding growth, that is not a Conservancy problem.

[donsutherland1]

16 minutes ago, etudiant said:

Afaik, the Conservancy only acts if there is a danger to people, but otherwise prefers to let nature do its own thing.

So even if the weather station gets smothered by the surrounding growth, that is not a Conservancy problem.

Unfortunately, that is the case when it comes to the climate record. The Conservancy does not place much value in the integrity of the climate record. That's the reality of its inaction despite what is now unequivocal evidence of the impact of the overgrowth of the trees around the ASOS.

[donsutherland1]

Under bright sunshine, much of the region away from the Long Island Sound or Atlantic Ocean saw the temperature reach or exceed 90°. 90° or above high temperatures included:

Allentown: 90°
Atlantic City: 90°
Baltimore: 94°
Boston: 91°
Harrisburg: 92°
Hartford: 92°
New York City-LGA: 94° (old record: 91°, 1953)
Newark: 95° (old record: 92°, 1932, 1953, and 1966)
Philadelphia: 93°
Poughkeepsie: 92° (tied record set in 1934 and tied in 1966)
Scranton: 90°
Sterling, VA: 92° (old record: 90°, 2002)
Trenton: 90°
Washington, DC: 91°
Wilmington, DE: 91°

In addition, Bridgeport tied its daily record of 86°, which was set in 1953.

90° Days for Select Cities (through June 5):

Albany: 0 (2020: 13 days; 5-Year Average: 13.6 days)
Allentown: 3 (2020: 24 days; 5-Year Average: 27.6 days)
Baltimore: 4 (2020: 46 days; 5-Year Average: 44.6 days)
Boston: 3 (2020: 14 days; 5-Year Average: 17.2 days)
Bridgeport: 1 (2020: 11 days; 5-Year Average: 13.4 days)
Burlington: 2 (2020: 20 days; 5-Year Average: 13.0 days)
Harrisburg: 3 (2020: 35 days; 5-Year Average: 30.6 days)
Hartford: 3 (2020: 39 days; 5-Year Average: 29.0 days)
Islip: 1 (2020: 8 days; 5-Year Average: 9.4 days)
New York City-JFK: 2 (2020: 12 days; 5-Year Average: 10.2 days)
New York City-LGA: 1 (2020: 34 days; 5-Year Average: 29.4 days)
New York City-NYC: 0 (2020: 20 days; 5-Year Average: 18.2 days)
Newark: 5 (2020: 31 days; 5-Year Average: 31.2 days)
Philadelphia: 4 (2020: 36 days; 5-Year Average: 34.6 days)
Scranton: 3 (2020: 25 days; 5-Year Average: 16.4 days)
Washington, DC: 5 (2020: 46 days; 5-Year Average: 50.8 days)

New York City-Newark Average: 2 (2020: 22 days)
...Expected: 3 (based on regression equation tied to JFK-LGA-EWR data)

In the Northern Plains, more recordbreaking heat occurred today ahead of an advancing cold front. Daily records included:

Bismarck: 103° (old record: 96°, 1952)
Duluth: 94° (old record: 88°, 1925 and 1988)
Fargo: 100° (old record: 95°, 1939)
Minneapolis: 99° (old record: 92°, 1925)
Toronto: 88° (old record: 86°, 1940)

Hot weather will likely last into the middle of next week before a cooling trend commences. Late next week and weekend could see cooler than normal conditions.

Overall, the first half of June will likely wind up much warmer than normal. The MJO's passage through Phase 4 at an amplitude of 1.500 or above during the May 15-25 period coupled with ENSO Region 1+2 temperature anomalies above -1.0°C and below +1.0°C, as has been the case this year, has typically seen warmth in the East during the first 10 days of June. Cooler conditions typically prevailed when the ENSO Region 1+2 anomalies were outside that range.

The ENSO Region 1+2 anomaly was -0.5°C and the Region 3.4 anomaly was -0.3°C for the week centered around May 26. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.62°C and the ENSO Region 3.4 anomaly has averaged -0.32°C. Neutral ENSO conditions will likely prevail into at least mid-summer.

The SOI was -20.32 today.

The preliminary Arctic Oscillation (AO) figure was +1.811 today.

On June 3 the MJO was in Phase 7 at an amplitude of 1.089 (RMM). The June 2-adjusted amplitude was 1.058 (RMM).

In late April, the MJO moved through Phase 8 at an extreme amplitude (+3.000 or above). Only February 25, 1988 and March 18-19, 2015 had a higher amplitude at Phase 8. Both 1988 and 2015 went on to have an exceptionally warm July-August period. July-August 1988 had a mean temperature of 79.1°, which ranked 4th highest for that two-month period. July-August 2015 had a mean temperature of 78.9°, which ranked 5th highest for that two-month period. September 2015 was also the warmest September on record. The MJO's extreme passage through Phase 8 could provide the first hint of a hot summer.

 

[SACRUS]

6/5

EWR: 95
LGA: 94
PHL: 93
BLM: 92
New Brnswck: 92
TEB: 91
TTN: 90
ACY: 90
NYC: 89
JFK: 87
ISP: 84

[Dark Star]

Is there any appreciable dew expected early tomorrow morning?

[donsutherland1]

During summer 2020 (June-August), Newark had an average high temperature of 86.5°. If one used the 1971-00 relationship (regression analysis based on June 1-August 30 maximum temperatures), the Central Park mean temperature was predicted to be 85.2°. Using the 1991-00 data-derived regression estimate, the predicted mean temperature would have been 84.4°, a 0.8° decrease. The actual figure was, in fact, 84.4°. The changed statistical relationship highlights the growing disconnect between regional temperatures and those in Central Park.

As the divergence continues, it is reasonable to question whether Central Park should remain a first order station, especially as it is becoming less representative of the region’s climate.

[forkyfork]

i wonder if lga will manage a low of 80 or above during this stretch 

[nycwinter]

1 hour ago, forkyfork said:

i wonder if lga will manage a low of 80 or above during this stretch 

thank goodness i live in cooler manhattan...

[Rtd208]

High for the day yesterday was 93 here.

Current temp 75/DP 65