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August 2020 General Discussions & Observations Thread


Rtd208

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1 hour ago, Euripides said:

Going to need to update Red Bank for a Tornado.

See picture a few posts above......

saw them... it may be that PHI-EM are doing storm survey right now.  You'll probably know sooner than I, but I doubt if anything will officially pot on this for a little while, pending data assessment. If they do go with a TOR..will update the graphic when I get a chance. Thanks and Later, Walt

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3 hours ago, bluewave said:

Pretty good model agreement between the Euro and GFS. Looks like Quebec will be the place to avoid the heat. Probably some severe convection along the front when it eventually sags south.

 

150EBF54-D83B-41FB-A0D1-0A6C355E013E.thumb.png.afb6362917f4272099c6442c3865daa4.png

A094E14D-2782-44A9-ADAD-0F30D9BF32CF.thumb.png.9ae0891ccbd97df3e5fa63c61f7ca7e5.png


 

 

 

 

Heat’s not surging over top of this area anymore-aimed right at us unlike early summer. 

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26 minutes ago, bluewave said:

This is the first time this summer that the models are indicating that the Bermuda high will build westward into the Southeast. All our other 95° or greater major heat events had the high elongating toward New England with onshore flow. So this may be our first legit westerly flow heat event.

29F8A864-EED0-48CF-8143-69FBF72F04F6.thumb.png.0267498f4b6d7c36785afd17dad3b7d3.png

 

Does that mean more of a dry heat?

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Another short-lived cool shot is overspreading the region in the wake of the showers and thundershowers and moved across the area earlier today. Overnight, parts of the region could see their coolest readings so far this month. Noticeably warmer weather will likely arrive this weekend. Readings could approach or reach 90° in much of the region early next week.

Out west, extreme heat again prevailed in the Southwest. Select high temperatures included:

Blythe, CA: 116° (old record: 114°, 1973)
Death Valley, CA: 125° (tied record set in 2001)
Flagstaff: 89° (old record: 88°, 1928 and 1973)
Kingman, AZ: 107°
Lake Havasu City, AZ: 117° (old record: 116°, 2011)
Las Vegas: 113° (old record: 111°, 1937 and 1992)
Mesa, AZ: 112° (old record: 108°, 2019)
Needles, CA: 118° (old record: 117°, 2018)
Palm Springs, CA: 114°
Phoenix: 115° (old record: 113°, 1986)
Sacramento: 101°
Stockton, CA: 105°
Tucson, AZ: 111° (old record: 110°, 1915)
Yuma, AZ: 112°

Death Valley reached 125° or above for the fifth consecutive day. That further extended its August record streak. The previous August record of three days was set during August 11-13, 1933 and tied during August 6-8, 1998.

In addition, Phoenix has now registered a record-tying four consecutive days with temperatures of 115° or above for the second time this summer. No previous year had more than one such stretch.

Phoenix has an implied 98% probability of having its warmest summer on record. Phoenix will likely finish with a summer mean temperature of 96.5° - 96.9°. The existing record is 95.1°, which was set in summer 2013 and tied in summer 2015. July 2020 was Phoenix's warmest month on record with a mean temperature of 98.9°. Since recordkeeping began in August 1895, two years saw both July and August rank among Phoenix's 20 warmest months on record: 2007 and 2019. It is all but certain that 2020 will become the third such case.

The current predominantly warmer than normal pattern will likely persist through much of September, paving the way for a solidly warmer than normal summer and a warm start to fall throughout the region. Occasional short-lived cool shots remain possible.  

The ENSO Region 1+2 anomaly was -0.9°C and the Region 3.4 anomaly was -0.5°C for the week centered around August 12. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.17°C and the ENSO Region 3.4 anomaly has averaged -0.45°C. Neutral-cool conditions will likely into the start of autumn. During the autumn, La Niña conditions will likely develop.

The SOI was +28.46. That was the highest SOI figure since April 2, 2018 when the SOI was +31.29.

Today, the preliminary Arctic Oscillation (AO) figure was -1.394.

On August 18, the MJO was in Phase 8 at an amplitude of 1.698 (RMM). The August 17-adjusted amplitude was 1.835.

The MJO's recent passage through Phase 8 at an amplitude of 1.500 or above has been fairly uncommon during the August 10-25 timeframe. During the 1981-2019 period only 2002 and 2004 saw the MJO move through Phase 8 with an amplitude of 1.500 or above during this period. Both cases were followed by a warmer than normal September.

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.

Since 1950, there have been five cases where a La Niña developed during June-July-August or afterward following an El Niño winter. 4/5 (80%) of those cases saw a predominant EPO+/AO+ winter pattern. The most recent such case was 2016-17. 9/10 (90%) of the La Niña winters that followed an El Niño winter featured a predominantly positive EPO.   

Based on sensitivity analysis applied to the latest guidance, there is an implied 83% probability that New York City will have a warmer than normal August. August will likely finish with a mean temperature near 77.0°.

 

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1 hour ago, bluewave said:

This is the first time this summer that the models are indicating that the Bermuda high will build westward into the Southeast. All our other 95° or greater major heat events had the high elongating toward New England with onshore flow. So this may be our first legit westerly flow heat event.

29F8A864-EED0-48CF-8143-69FBF72F04F6.thumb.png.0267498f4b6d7c36785afd17dad3b7d3.png

 

Lower DT could allow for the highest temps of the season.  Lot of time to track .   Been tracking this possibility that heat out west is abnormally intense and it bleeds east peaking Wed  - Fri next week.  

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5 hours ago, SACRUS said:

Lower DT could allow for the highest temps of the season.  Lot of time to track .   Been tracking this possibility that heat out west is abnormally intense and it bleeds east peaking Wed  - Fri next week.  

I will confidently take the under on that. It would have to be above 98 for that to happen and I don't see anything like that in the forecast.

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The next 8 days are averaging 81degs., or 6.5degs. AN.

Month to date is  +1.7[77.5].       Should be about  +2.9[78.3] by the 28th.

90-Degree Days during next 10 days:     GFS 6,  EURO 2,  GEM 1--their Ensembles have none between them.

67*(73%RH) here at 6am, m. clear.         76* by 3pm.       Ran up to 84* by 5pm

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MPO finally ended their record above 50° streak. All the top 5 records are since 2012.

MOUNT POCONO   CLEAR     47  45  93 CALM   
Number of Consecutive Days Min Temperature >= 50 
for MOUNT POCONO POCONO MOUNTAINS MUNICIPAL AP, PA
Click column heading to sort ascending, click again to sort descending.
Rank
Run Length
Ending Date
1 63 2020-08-19
2 60 2019-08-23
3 48 2016-08-21
- 48 2008-08-12
4 45 2013-08-04
5 43 2012-08-18

 

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