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June 2020 General Discussions & Observations Thread


Rtd208
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75 / 52 here at 9:30.  Off a low of 53.

Looks like  bit of a difficult to pin down type of pattern shaping up in the 6/14 - 6/20 period with ULL undercutting ridging.  Wont be rain everyday but pending on where the ULL(s) setup may bring some much cooler /wetter weather for part of that period.  Beyond there Rockies ridge should push east again to close out June, but center of ridge may favor warm but stormy.   

 

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32 minutes ago, SACRUS said:

but center of ridge may favor warm but stormy.   

 

Do you think there is a risk of ridge runners and severe weather moving NW to SE in such a pattern ? Looks interesting at this time frame, even though it is way out there. 

 

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1 hour ago, frd said:

Do you think there is a risk of ridge runners and severe weather moving NW to SE in such a pattern ? Looks interesting at this time frame, even though it is way out there. 

 

Will be interesting to see how it evolves.  Could be for someone 

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44 minutes ago, frd said:

 

@bluewave 

Any comment on this occurrence regarding the QBO?

 A great read throughout and thought provoking. A  rather complex event and a evolving one as well.  Seems the implications "could" be wide ranging for the summer into the winter .

 

 

 

It will be interesting to see what happens. Research suggests that these disruptions will become more common as the climate continues to warm. A meteorologist on twitter wondered if this particular event was related to the record +IOD.

https://science.sciencemag.org/content/353/6306/1424

One of the most repeatable phenomena seen in the atmosphere, the quasi-biennial oscillation (QBO) between prevailing eastward and westward wind jets in the equatorial stratosphere (approximately 16 to 50 kilometers altitude), was unexpectedly disrupted in February 2016. An unprecedented westward jet formed within the eastward phase in the lower stratosphere and cannot be accounted for by the standard QBO paradigm based on vertical momentum transport. Instead, the primary cause was waves transporting momentum from the Northern Hemisphere. Seasonal forecasts did not predict the disruption, but analogous QBO disruptions are seen very occasionally in some climate simulations. A return to more typical QBO behavior within the next year is forecast, although the possibility of more frequent occurrences of similar disruptions is projected for a warming climate.

 

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the frequency of 80 degree minimum days are going up like all the other temperature records for NYC and Newark NJ....here is the list of days with a minimum 80 or higher for NYC and Newark...

Newark N.J. 80 degree minimum days...

min/max...date...

80/97.....7/17/1968

80/90.....7/24/1972

80/97.....8/03/1975

80/98.....7/23/1978

81/101...7/21/1980

80/98.....7/09/1981

80/94.....7/10/1981

80/100...7/18/1982

80/98.....7/19/1982

80/98.....7/16/1983

80/97.....8/15/1985

80/95.....8/12/1988

80/98.....8/14/1988

81/99.....8/15/1988

82/105...7/08/1993

83/104...7/09/1993

84/105...7/10/1993

80/99.....7/11/1993

80/97.....7/12/1993

82/104...7/15/1995

81/103...7/05/1999

82/102...7/06/1999

80/99.....8/01/1999

82/101...8/08/2001

82/98.....7/03/2002

81/100...7/04/2002

81/96.....7/30/2002

80/102...8/13/2005

81/100...8/02/2006

80/101...8/03/2006

80/98.....6/28/2010

81/103...7/06/2010

82/99.....7/24/2010

86/108...7/22/2011

86/102...7/23/2011

82/100...7/19/2013

80/97.....7/20/2015

80/98.....7/23/2016

80/97.....8/14/2016

80/98.....7/20/2019

80/99.....7/21/2019

……………...…………………………………………………………..


min/max.......dates...

81/90......7/03/1876

81/90......7/19/1878
80/95......7/07/1883
80/94......7/25/1885
81/91......8/11/1891
82/98......8/09/1896
80/94......8/10/1896
81/96......8/11/1896
81/95......7/18/1900

80/95......6/30/1901
82/100....7/02/1901
80/96......7/18/1905
80/95......7/19/1905
80/92......8/11/1905
80/87......7/23/1906
80/94......8/06/1906
80/90......7/05/1908
81/95......7/06/1908
84/93......7/07/1908
81/93......8/05/1908
80/87......8/06/1908
82/94......8/13/1908
84/93......8/14/1908
82/100....7/31/1917
82/98......8/01/1917
80/96......8/06/1918
82/104....8/07/1918
81/94......7/20/1930
80/98......8/02/1933
81/100....6/26/1952
80/95......7/16/1952
80/101....7/22/1957
81/95......7/23/1978
82/102....7/21/1980
80/96......8/08/1980
80/95......8/09/1980
80/95......8/15/1985
80/94......8/12/1988
80/99......8/14/1988
81/97......8/15/1988
80/100....7/08/1993
80/102....7/10/1993
84/102....7/15/1995
82/102....7/05/1999
83/101....7/06/1999
82/103....8/09/2001
82/95......7/03/2002
81/96......7/04/2002
80/95......7/30/2002
80/98......8/13/2002
80/99......8/13/2005
83/97......8/02/2006
81/103....7/06/2010
80/100....7/07/2010
80/97......7/24/2010
84/104....7/22/2011
83/100....7/23/2011

82/94......7/20/2015

80/96......7/23/2016

81/96......8/13/2016

81/92......8/29/2018

82/95......7/20/2019

80/95......7/21/2019

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Wild T distributions in location and time.       I was on beach during the afternoon and felt an almost chilly S=breeze around 2pm-3pm.       JFK T was killed by this and I did not even reach 80* till 4pm and wound up with an 89* near 7pm!

GFS still going with a hot period [19th-25th] with numerous runs having100's showing.        Not getting that impression from other outputs.

The last 10 days of the month look Normal or better on the analogs.     500mb heights are 5820m but it shows this level dropping sharply south during the July 04th period----dropping down to S. Carolina in a sharp trough.

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Temperatures will returned to the 80s across much of the region today with a few 90° temperatures. High temperatures included: Bridgeport: 85°; Islip: 83°; New York City: 87°; Newark: 90°; and, Philadelphia: 88°.

Tomorrow will be another warm day with temperatures rising into at least the lower and middle 80s.

No excessive heat is likely through at least the first half of June in the Middle Atlantic and southern New England regions. However, there are emerging hints of a long-range pattern change toward sustained warmer than normal conditions perhaps beginning in the third or fourth week of June. Afterward, the pattern change could lock in for July.

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 June 3. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.05°C and the ENSO Region 3.4 anomaly has averaged -0.17°C. Neutral-cool conditions will likely prevail through mid-summer. The probability of the development of a La Niña event during late summer or early autumn has increased in recent weeks.

The SOI was +7.31 today.

Today, the preliminary Arctic Oscillation (AO) figure was +0.152.

On June 8, the MJO was in Phase 1 at an amplitude of 1.633 (RMM). The June 7-adjusted amplitude was 1.685.

April and May 2020 featured unseasonably cool readings in the region. But now the proverbial clock may be starting to run out on the cool pattern.

Last year, the MJO went through a very strong passage through Phase 1 during the closing days of May. About four weeks later, the pattern was locking in with sustained above normal temperatures.

This year, the MJO was in Phase 1 for 3 consecutive days with an amplitude of 1.500 or above during the June 1-3 period. Since 1981, there were four such cases that saw the MJO meet or exceed those thresholds during the June 1-10 period: 2002, 2006, 2007, and 2015. While the four cases were evenly split between cooler and warmer than normal during the second half of June, 3 of those 4 cases saw a warmer to much warmer than normal July. This could be an early indication that a summer that will start with near normal temperatures overall (June) could turn warmer than normal afterward.

Last year, the SOI fell to -42.04 on June 22 when the MJO was in Phase 6. This year, the SOI plunged below -46.68 on June 5, its lowest level in more than three years. The dramatic plunge in the SOI could be the proverbial spark that kicks off a sequence of events leading to the development of a sustained warmer than normal period. Taking into consideration the MJO, that transition could begin some time during the closing 10 days of June. Just as had been the case last year, July and August could feature warm anomalies in the East.

Based on sensitivity analysis applied to the latest guidance, there is an implied 61% probability that New York City will have a warmer than normal June. June will likely finish with a mean temperature near 72.5°.

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