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July 2020 General Discussions & Observations Thread


Rtd208

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On 7/28/2020 at 12:59 PM, forkyfork said:

 

Third consecutive July with such high temperatures centered near the Northeast. People used to head for New England to beat the summer heat. Now they need to go further up into Canada for relief.

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Hi!  I see a couple of showers formed along the NJ shore earlier this afternoon, even sw LI.  Congestus looked pretty neat from the back side here in elevated Wantage of extreme nw NJ. 

I don't have much time to post today and so nothing new til tomorrow morning.  Differences in GFS/EC for tomorrow night should iron out on the 00z/30 cycle.  Am thinking continuity on this mornings post and mulling over how to topic the following..

Thu aftn-Fri morning SVR potential s CT/se NYS Thu afternoon-evening, then quite a bit of rain for at least e LI tomorrow night and Fri morning.

Sat night-early Sunday: WAA slug of heavy showers.  

Sun afternoon: potential for svr into extreme nw NJ?

Monday-Tuesday: Tropical rains and a possible PRE?  

Am thinking lump Thu-Sunday as one topic with potentially 4 different events...  and Monday-Tuesday as the tropical topic locally featured unless there is a major change in 00z/30 EPS/GEFS and associated tracks of the as yet named storm (410P). Looks like an eastern seaboard pockets of excessive rainfall event.  Didn't yet buy into the EC op gusts/850 winds for our area.  Too-too much can wrong 5-6 days in advance.  Modeling does underscore some of the potential, especially qpf.

Back after 9P

Walt 410P/20

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5th longest streak for LGA not dropping below 70°.

 

Number of Consecutive Days Min Temperature >= 70 
for LAGUARDIA AIRPORT, NY
Click column heading to sort ascending, click again to sort descending.
Rank
Run Length
Ending Date
1 34 2006-08-10
2 32 1980-08-15
3 29 2018-08-19
4 28 2010-07-30
5 26 2020-07-28
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1 hour ago, bluewave said:

5th longest streak for LGA not dropping below 70°.

 

Number of Consecutive Days Min Temperature >= 70 
for LAGUARDIA AIRPORT, NY
Click column heading to sort ascending, click again to sort descending.
Rank
Run Length
Ending Date
1 34 2006-08-10
2 32 1980-08-15
3 29 2018-08-19
4 28 2010-07-30
5 26 2020-07-28

Heat milestones all over. DC has 32 straight 70+ lows for 3rd longest, approaching the record of 35 in 2016. They also broke the record of 90+ days in a month at 27, breaking the record of 25. I dont see LGA getting below 70 anytime soon, you think we make it to the top spot? I believe LGA is just short of most 90s in a month too?

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13 minutes ago, dWave said:

Heat milestones all over. DC has 32 straight 70+ lows for 3rd longest, approaching the record of 35 in 2016. They also broke the record of 90+ days in a month at 27, breaking the record of 25. I dont see LGA getting below 70 anytime soon, you think we make it to the top spot? I believe LGA is just short of most 90s in a month too?

Right at the top of the list for July 90° and 95° days.

Time Series Summary for LAGUARDIA AIRPORT, NY - Month of Jul
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Number of Days Max Temperature >= 90 
Missing Count
1 2010 18 0
  2020 18 2
2 1999 17 0
3 2016 15 0
- 2013 15 0
4 2019 14 0
- 2012 14 0
- 2011 14 0

 

Time Series Summary for LAGUARDIA AIRPORT, NY - Month of Jul
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Number of Days Max Temperature >= 95 
Missing Count
1 2020 11 2
- 1999 11 0
2 2012 7 0
- 1955 7 0
3 2013 6 0
- 2010 6 0
- 2002 6 0
- 1991 6 0
- 1966 6 0
4 2019 5 0

 

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The temperature reached the upper 80s and lower 90s across the region today. Tomorrow will be another very warm day. Readings will likely remain several degrees above normal into the weekend.

Some of the guidance suggests the potential for above normal rainfall during the first week of August for a portion of the region. Tropical moisture could be involved.

Through today, New York City's LaGuardia Airport has a monthly mean temperature of 82.8°. July will likely end with a mean temperature between 82.6°-82.8° there. July 2010, with a mean temperature of 82.8°, is LaGuardia's warmest month on record.

The current predominantly warmer than normal pattern will likely persist through at least August, paving the way for a solidly warmer than normal summer throughout the region. Occasional short-lived cool shots remain possible.

The ENSO Region 1+2 anomaly was -1.2°C and the Region 3.4 anomaly was -0.4°C for the week centered around July 22. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.15°C and the ENSO Region 3.4 anomaly has averaged -0.18°C. Neutral-cool conditions will likely into the start of autumn. During the autumn, La Niña conditions could develop.

The SOI was -1.23.

Today, the preliminary Arctic Oscillation (AO) figure was -0.493.

On July 28, the MJO was in Phase 2 at an amplitude of 1.379 (RMM). The July 27-adjusted amplitude was 1.538.

The MJO has been in either Phase 1 or Phase 2 for 59 consecutive days.

Last year, the MJO went through a very strong passage through Phase 1 during the closing days of May. About four weeks later, a warmer than normal pattern locked in and predominated through early autumn. 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.

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. The cases that saw both the MJO and SOI thresholds satisfied generally saw 10-20 days where the temperature reached or exceeded 90° in New York City during the July 1-August 31 period.

Since 1990, there have been 11 La Niña events, 6 of which followed an El Niño winter. 10/11 (91%) case saw warmer than normal September. All 6 following an El Niño winter were warmer than normal. September mean temperatures for New York City for those cases were: 11 cases: 69.9°; Subset of 6 cases: 70.8°; Entire 1990-2019 period: 69.0°. The September mean temperature for all La Niña and neutral-cool cases following an El Niño winter (1950-2019: n=13) was 69.9°. Overall, the evolution of ENSO, along with the observed ongoing monthly warming (1.6°/decade in NYC and 1.5°/decade in the Northeast Region during September 1990-2019), favors a warmer than normal September.

Based on sensitivity analysis applied to the latest guidance, there is an implied near 100% probability that New York City will have a warmer than normal July. July will likely finish with a mean temperature near 80.0°.

Based on the latest guidance, including the EPS weekly forecasts and the CFSv2 monthly forecast, August will likely be warmer than normal across the region. However, August will likely have a smaller warm anomaly than July.

 

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