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June 2021


Stormlover74
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Boston tied their all -time June maximum temperature. Newark tied for the second day in a row. LGA missed by 1°.

 

RECORD EVENT REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
0320 PM EDT WED JUN 30 2021

...RECORD HIGH TEMPERATURE SET AT BOSTON MA...

A RECORD HIGH TEMPERATURE OF 100 FOR BOSTON MA TODAY 
JUN 30TH. 

THIS BREAKS THE OLD RECORD OF 95 SET IN 1945.

 

RECORD EVENT REPORT
NATIONAL WEATHER SERVICE NEW YORK, NY
0444 PM EDT WED JUN 30 2021

...RECORD HIGH TEMPERATURE SET AT NEWARK NJ...

A RECORD HIGH TEMPERATURE OF 102 WAS SET AT NEWARK NJ TODAY.
THIS BREAKS THE OLD RECORD OF 99 SET IN 1964.

 

RECORD EVENT REPORT
NATIONAL WEATHER SERVICE NEW YORK, NY
0440 PM EDT WED JUN 30 2021

...RECORD HIGH TEMPERATURE SET AT LAGUARDIA NY...

A RECORD HIGH TEMPERATURE OF 100 WAS SET AT LAGUARDIA NY TODAY.
THIS BREAKS THE OLD RECORD OF 97 SET IN 1964.
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It was another hot day across the region. New York City finished with a preliminary mean temperature of 74.3° (2.3° above normal). Temperatures rose into the lower and middle 90s in many places. 90° or above high temperatures included:

Albany: 90°
Allentown: 96°
Atlantic City: 94°
Baltimore: 99°
Bangor: 91°
Boston: 100° (old record: 95°, 1945) ***Tied June Record***
Bridgeport: 96° (old record: 94°, 1959)
Concord: 96°
Harrisburg: 98° (old record: 97°, 1901, 1964, and 1991)
Hartford: 98°
Manchester, NH: 96° (old record: 92°, 1931, 2001, and 2018)
New York City-JFK: 91°
New York City-LGA: 100° (old record: 97°, 1945 and 1964)
New York City-NYC: 98°
Newark: 103° (old record: 99°, 1964) ***New June Record***
Philadelphia: 97°
Portland: 95°
Poughkeepsie: 98°
Providence: 96°
Scranton: 93°
Trenton: 96°
Washington, DC: 95°
Wilmington, DE: 97°
Worcester: 93° (old record: 92°, 1964 and 1971)

Based on a statistical regression analysis based on high temperatures at surrounding sites, it is likely that had Central Park not had a tree issue, the mercury would have reached an even 100° there.

90° Days for Select Cities (through June 30):

Albany: 4 (2020: 13 days; 5-Year Average: 13.6 days)
Allentown: 10 (2020: 24 days; 5-Year Average: 27.6 days)
Baltimore: 14 (2020: 46 days; 5-Year Average: 44.6 days)
Boston: 11 (2020: 14 days; 5-Year Average: 17.2 days)
Bridgeport: 5 (2020: 11 days; 5-Year Average: 13.4 days)
Burlington: 7 (2020: 20 days; 5-Year Average: 13.0 days)
Harrisburg: 11 (2020: 35 days; 5-Year Average: 30.6 days)
Hartford: 11 (2020: 39 days; 5-Year Average: 29.0 days)
Islip: 2 (2020: 8 days; 5-Year Average: 9.4 days)
New York City-JFK: 5 (2020: 12 days; 5-Year Average: 10.2 days)
New York City-LGA: 9 (2020: 34 days; 5-Year Average: 29.4 days)
New York City-NYC: 8 (2020: 20 days; 5-Year Average: 18.2 days)
Newark: 16 (2020: 31 days; 5-Year Average: 31.2 days)
Philadelphia: 12 (2020: 36 days; 5-Year Average: 34.6 days)
Scranton: 9 (2020: 25 days; 5-Year Average: 16.4 days)
Washington, DC: 11 (2020: 46 days; 5-Year Average: 50.8 days)

New York City-Newark Average: 10 (2020: 22 days)
...Expected: 10 (based on regression equation tied to JFK-LGA-EWR data)

Cooler air will now move into the region. Tonight through Friday, there will be showers and thunderstorms, some of which can produce heavy downpours. A general 1.00"-2.00" rainfall is likely. Some areas could see in excess of 3.00" of rain.

Overall, July looks to be another warmer than normal month across the Middle Atlantic and New England areas.

Out West an unprecedented heat event shattered still more high temperature records. Preliminary high temperatures included:

Fort Nelson, BC: 88°/31.2°C (old record: 87°/30.8°C, 1982)
Fort Smith, NT: 104°/39.9°C (old record: 89°/31.7°, 1955) ***All-Time Record***
Hermiston, OR: 109° (old record: 105°, 2008)
Kamloops, BC: 116°/46.4°C (old record: 101°/38.5°, 2008)
Lewiston, ID: 113° (old record: 108°, 1924)
Lillooet, BC: 107°/41.7°C (old record: 99°/37.1°C, 2008)
Omak, WA: 114° (Old record: 107°, 1924)
Pasco, WA: 113° (old record: 104°, 2008)
Spokane: 104° (old record: 99°, 1924)
Walla Walla, WA: 108° (old record: 104°, 1987)
Yakima, WA: 108° (old record: 102°, 2008)

Climate change has increased the frequency, magnitude, and duration of extreme heat events in the United States and worldwide. Climate change has increased the frequency, magnitude, and duration of extreme heat events in the United States and worldwide. Further increases are likely in coming decades as the world's climate continues to warm.

In large part on account of Phoenix's recent extreme heat event, June 2021 became Phoenix's warmest June on record with a mean temperature of 95.3°. The previous record of 94.8° was set in 2013 and tied in 2016.

The ENSO Region 1+2 anomaly was +0.2°C and the Region 3.4 anomaly was 0.0°C for the week centered around June 23. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.17°C and the ENSO Region 3.4 anomaly has averaged -0.20°C. Neutral ENSO conditions will likely prevail through August.

The SOI was +10.75 today.

The preliminary Arctic Oscillation (AO) figure was +0.365 today.

On June 28 the MJO was in Phase 1 at an amplitude of 1.700 (RMM). The June 27-adjusted amplitude was 1.693 (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.

Since 1896, 76% of years that saw Phoenix reach 115° or above in June, as occurred this year, had a warmer than July-August in the Middle Atlantic region. The ratio of top 30 July-August temperatures relative to bottom 30 temperatures was 6:1 in favor of the warmth. Overall, the ingredients continue to fall into place for a warmer than normal to potentially hot summer.

 

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