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June 2021


Stormlover74
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The weekend ended on another hot note. Temperatures soared into the 90s in many areas, including some areas along the Long Island Sound and Atlantic Ocean. Temperatures reached 90° or above at locations including:

Allentown: 92°
Atlantic City: 91°
Baltimore: 96°
Boston: 94°
Bridgeport: 93° (old record: 88°, 1953, 1968, and 2020)
Burlington: 95° (old record: 94°, 1925)
Concord: 93°
Harrisburg: 94°
Hartford: 94°
Islip: 90° (old record: 89°, 1968)
Manchester, NH: 94° (old record: 93°, 1953)
New Haven: 92° (old record: 88°, 1953)
New York City-LGA: 95° (old record: 93°, 2010)
New York City-NYC: 92°
Newark: 97° (old record: 92°, 2010)
Philadelphia: 93°
Poughkeepsie: 92° (tied record set in 1947)
Providence: 93°
Scranton: 90°
Sterling, VA: 93° (old record: 92°, 2005)
Toronto: 92° (old record: 91°, 2008)
Trenton: 92°
Washington, DC: 92°
White Plains: 91°
Wilmington, DE: 90°

90° Days for Select Cities (through June 6):

Albany: 0 (2020: 13 days; 5-Year Average: 13.6 days)
Allentown: 4 (2020: 24 days; 5-Year Average: 27.6 days)
Baltimore: 5 (2020: 46 days; 5-Year Average: 44.6 days)
Boston: 4 (2020: 14 days; 5-Year Average: 17.2 days)
Bridgeport: 2 (2020: 11 days; 5-Year Average: 13.4 days)
Burlington: 3 (2020: 20 days; 5-Year Average: 13.0 days)
Harrisburg: 4 (2020: 35 days; 5-Year Average: 30.6 days)
Hartford: 4 (2020: 39 days; 5-Year Average: 29.0 days)
Islip: 2 (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: 2 (2020: 34 days; 5-Year Average: 29.4 days)
New York City-NYC: 1 (2020: 20 days; 5-Year Average: 18.2 days)
Newark: 6 (2020: 31 days; 5-Year Average: 31.2 days)
Philadelphia: 5 (2020: 36 days; 5-Year Average: 34.6 days)
Scranton: 4 (2020: 25 days; 5-Year Average: 16.4 days)
Washington, DC: 6 (2020: 46 days; 5-Year Average: 50.8 days)

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

Tomorrow will be another hot day. The heat will be most intense relative to climatology across northern New England and Quebec. Widespread near record and record high temperatures are likely in that region.

The hot weather will likely last into the middle of the week before a cooling trend commences. Late this 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 -21.44 today.

The preliminary Arctic Oscillation (AO) figure was +1.840 today.

On June 4 the MJO was in Phase 7 at an amplitude of 0.995 (RMM). The June 3-adjusted amplitude was 1.089 (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.

 

 

 

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The following information is based on a multiple regression equation based on high temperatures at Newark, LaGuardia Airport, and White Plains to estimate the high temperatures at Central Park for June to address the impact of today’s thick tree cover. The equation was based on June 1-June 30, 1971-2000 daily high temperatures. That period was the last base normal period during which at least half of the days were not impacted by increasing tree cover. A few days were excluded from the sample due to “Missing” values for White Plains.

Based on the regression equation, there may have been up to 32 additional 90° days in June during the 2000-20 period. That would lift Central Park’s average number of such days during June 2000-20 to 3.8 from 2.2. That would be reasonably in line with the 5.2 recorded at LaGuardia Airport and 4.2 at Newark. 

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1 hour ago, donsutherland1 said:

The following information is based on a multiple regression equation based on high temperatures at Newark, LaGuardia Airport, and White Plains to estimate the high temperatures at Central Park for June to address the impact of today’s thick tree cover. The equation was based on June 1-June 30, 1971-2000 daily high temperatures. That period was the last base normal period during which at least half of the days were not impacted by increasing tree cover. A few days were excluded from the sample due to “Missing” values for White Plains.

Based on the regression equation, there may have been up to 32 additional 90° days in June during the 2000-20 period. That would lift Central Park’s average number of such days during June 2000-20 to 3.8 from 2.2. That would be reasonably in line with the 5.2 recorded at LaGuardia Airport and 4.2 at Newark. 

Excellent work!  That kind of impact seems very plausible. 

It does underscore the deficiency in the current situation with the NYC weather record getting distorted. 

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3 hours ago, donsutherland1 said:

The following information is based on a multiple regression equation based on high temperatures at Newark, LaGuardia Airport, and White Plains to estimate the high temperatures at Central Park for June to address the impact of today’s thick tree cover. The equation was based on June 1-June 30, 1971-2000 daily high temperatures. That period was the last base normal period during which at least half of the days were not impacted by increasing tree cover. A few days were excluded from the sample due to “Missing” values for White Plains.

Based on the regression equation, there may have been up to 32 additional 90° days in June during the 2000-20 period. That would lift Central Park’s average number of such days during June 2000-20 to 3.8 from 2.2. That would be reasonably in line with the 5.2 recorded at LaGuardia Airport and 4.2 at Newark. 

Excellent.

 

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The next 8 days are averaging 74degs.(65/83), or about +3.0.

My T went nowhere with yesterday's seabreeze, ending at 85* late.

GFS wetter and cooler again, but more 90+ still coming Week 3.

72*(80%RH) here at 6am, scattered clouds, hazy blue.         78* by 11am.        But  crashed to 73* by Noon and cumulus clouds west.           Reached 80* 5:30pm-6:30pm, missed rain.

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7 hours ago, etudiant said:

Excellent work!  That kind of impact seems very plausible. 

It does underscore the deficiency in the current situation with the NYC weather record getting distorted. 

I think NYC Central Park is slightly distorted with summer daytime temps to low and Newark and LaGuardia slightly distorted with summer daytime temps to high.

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Staten Island can be as hot as Newark and many times like yesterday mby was as hot as they were...I never liked the radiation shields used now...I think the old weather box's or shelters gave a lower reading...That's just a theory on my part...the only way to test my theory is to set up a shelter and shield side by side with calibrated thermometers and see what happens...

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19 minutes ago, lee59 said:

I think NYC Central Park is slightly distorted with summer daytime temps to low and Newark and LaGuardia slightly distorted with summer daytime temps to high.

NYC is much more than slightly distorted on the high temperatures. The Central Park station used to have high temperatures comparable to EWR and LGA before the trees began to block the sensor in the early 90s. Go back and look at the comparisons from the 1950s to the 1980s. As for LGA and EWR, they are right in line with the neighborhood stations in Brooklyn, Queens, and Staten Island. The high temperatures from the new NYC micronet stations were in the same range as EWR and LGA. This makes Central Park stand out more like a sore thumb. 
 

Sunday high temperatures with ground level new micronet stations

Brownsville…….95

Corona…….……..98

Fresh Kills………96

Queensbridge..96

LGA………………….95

EWR………….……..97

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Morning thoughts...

Today will be partly cloudy and hot. A few places could see an afternoon or evening shower or thundershower. Temperatures will likely top out in the upper 80 and lower 90s in much of the region. Likely high temperatures around the region include:

New York City (Central Park): 89°

Newark: 95°

Philadelphia: 92°

Tomorrow will be variably cloudy and still warm. Temperatures will likely run a few degrees cooler than today. Showers and thundershowers are possible.

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15 minutes ago, bluewave said:

NYC is much more than slightly distorted on the high temperatures. The Central Park station used to have high temperatures comparable to EWR and LGA before the trees began to block the sensor in the early 90s. Go back and look at the comparisons from the 1950s to the 1980s. As for LGA and EWR, they are right in line with the neighborhood stations in Brooklyn, Queens, and Staten Island. The high temperatures from the new NYC micronet stations were in the same range as EWR and LGA. This makes Central Park stand out more like a sore thumb. 
 

Sunday high temperatures with ground level new micronet stations

Brownsville…….95

Corona…….……..98

Fresh Kills………96

Queensbridge..96

LGA………………….95

EWR………….……..97

Yup hit 96 for the high here

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10 minutes ago, bluewave said:

NYC is much more than slightly distorted on the high temperatures. The Central Park station used to have high temperatures comparable to EWR and LGA before the trees began to block the sensor in the early 90s. Go back and look at the comparisons from the 1950s to the 1980s. As for LGA and EWR, they are right in line with the neighborhood stations in Brooklyn, Queens, and Staten Island. The high temperatures from the new NYC micronet stations were in the same range as EWR and LGA. This makes Central Park stand out more like a sore thumb. 
 

Sunday high temperatures with ground level new micronet stations

Brownsville…….95

Corona…….……..98

Fresh Kills………96

Queensbridge..96

LGA………………….95

EWR………….……..97

If you look at the high temps around the northeast that donsutherland1 listed a few posts up, you will see Newark was the hottest. This does not surprise me, they seem to be close to the hottest during most every heat wave. If anything, when you compare Central Park and Newark, it certainly shows how thermometer placement can make quite a difference. 

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5 minutes ago, lee59 said:

If you look at the high temps around the northeast that donsutherland1 listed a few posts up, you will see Newark was the hottest. This does not surprise me, they seem to be close to the hottest during most every heat wave. If anything, when you compare Central Park and Newark, it certainly shows how thermometer placement can make quite a difference. 

plus Newark is around ten feet above sea level while Central Park is 132ft above with many trees around...I think ones to warm and the other to cool...

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First heatwave for many sites today as temps look to heat up ahead of any storms this afteroon.  Tue (6/8) and Wed (6/9) more storms but still warm and with enough sun places coulsd reach 90s but it'll be close.  Cool down  (Thu 6/10) - much of the next 7 days as the ridges split with the Rockies ridge pulling west and the WAR shunted east.  Likely a wet period with temps near normal or below during the rainiest times.  Beyond there 6/18 and on the Rockies ridge cranks and trough pushes into the WC.  The Rockies ridge pushes east and likely setting up the next heat spike for the northeast in the 6/19 - 6/23 period.

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1 hour ago, uncle W said:

plus Newark is around ten feet above sea level while Central Park is 132ft above with many trees around...I think ones to warm and the other to cool...

I was driving thru Staten Island on Friday afternoon. That was some thunderstorm, extreme rain, hail and strong winds. I drove thru it all.

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1 hour ago, uncle W said:

plus Newark is around ten feet above sea level while Central Park is 132ft above with many trees around...I think ones to warm and the other to cool...

Agreed.  Plus many times, looking over prior years' 90 degree days, Central Park was similar to Trenton on many days.  Some days Trenton was 91 and Central park was 89.  That actually seems pretty plausible based on geography.  

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3 hours ago, bluewave said:

NYC is much more than slightly distorted on the high temperatures. The Central Park station used to have high temperatures comparable to EWR and LGA before the trees began to block the sensor in the early 90s. Go back and look at the comparisons from the 1950s to the 1980s. As for LGA and EWR, they are right in line with the neighborhood stations in Brooklyn, Queens, and Staten Island. The high temperatures from the new NYC micronet stations were in the same range as EWR and LGA. This makes Central Park stand out more like a sore thumb. 
 

Sunday high temperatures with ground level new micronet stations

Brownsville…….95

Corona…….……..98

Fresh Kills………96

Queensbridge..96

LGA………………….95

EWR………….……..97

Made it up to 93 at my station yesterday in Sheepshead Bay before the wind shift to the south 

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