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July 2019 General Discussions & Observations Thread


bluewave
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5 minutes ago, psv88 said:

Nothing crazy out here, looks like a seabreeze kicks in. This is not a setup where LI bakes like last weekend. Im thinking 94 for ISP and FRG, 95-96 north shore.

It'll be 95+ by noon here and then I'll be thankful when the seabreeze kicks in at 1.  

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1 minute ago, Rjay said:

It'll be 95+ by noon here and then I'll be thankful when the seabreeze kicks in at 1.  

exactly, westerly flow showing up, so the seabreeze will be more WSW-SW, which isn't exactly cooling for most of the island. north shore could be just as hot as the city.

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Long Beach will be a great place to be this weekend-likely a good 10-15 degrees cooler or more than Manhattan. Depends on how westerly the wind ends up-if it’s more SSW it may not even hit 90. The humidity though will still be horrendous. Up by me we likely get past 95 but the sea breeze gets here before we make it to 100. East of Queens it’s hard to really bake when the wind is SW or SSW. 

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Arkansas May have set a new state tropical cyclone rainfall record with Barry. 

https://mobile.twitter.com/EricBlake12/status/1151136520864010242

Torrential rains in SW Arkansas overnight from #Barry have brought radar estimates above the Arkansas state rainfall record for a tropical cyclone. Caution advised tho- need a real gauge SE of Dierks to confirm!

https://mobile.twitter.com/Maxar_Weather/status/1151137924827631616

If this verifies, AR would join TX (60.58" Harvey 2017), NC (35.93" Florence 2018), SC (23.63" Florence 2018), and HI (52.02" Lane 2018) in setting state rainfall records for tropical cyclones in the last few years

https://mobile.twitter.com/WxZachary/status/1151120055721218050

More incredible flooding footage coming from Dierks, Arkansas. Follower Tashia Siracusa sent this from the local EZ-Mart

 

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4 hours ago, bluewave said:

The highest heat indices may end up near and to the north of JFK on Saturday. The Euro has an area upper 90’s temperatures  with upper 70’s dewpoints.

 

46478335-7C9A-4FE5-A6A3-1F8A27D6FFB7.thumb.png.7f0424802af7518cec4cb5b411a0ad50.png

 

Happy I only have to work in Great Neck now, looks like NW Nassau, N Queens, BK & NYC will roast.

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Consistent with the pattern suggested by historic MJO cases, some of the hottest weather so far this season appears likely to develop during the second half of July. The Middle Atlantic and southern New England regions could experience a heat wave during the second half of this week. The potential for one or two days with high temperatures of 95° or above is on the table.

Before then, the remnants of Barry will likely bring 0.50"-1.00" rain with locally higher amounts to the region. Some of the guidance is suggesting that the system could tap some Atlantic moisture resulting in a general 1.00"-2.00" rainfall with some locally higher amounts in parts of eastern New England, including Boston.

Meanwhile, Anchorage appears headed for its warmest month on record following its warmest June on record. Based on the latest guidance, Anchorage has an implied 92% probability of seeing only its 19th month on record with a mean temperature of 60.0° or above and an implied 67% probability of surpassing the 62.7° registered in July 2016 as its warmest month on record. 12/18 (67%) of its 60.0° or warmer months occurred in 2000 and afterward and 6/18 (33%) occurred 2015 or later.

The ENSO Region 1+2 anomaly was -0.2°C and the Region 3.4 anomaly was +0.4°C for the week centered around July 10. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.23°C and the ENSO Region 3.4 anomaly has averaged +0.57°C. Neutral-warm ENSO conditions are now evolving. There is considerable uncertainty about the ENSO evolution later this summer into the fall. Some of the guidance now shows the development of neutral-cool ENSO conditions.

The SOI was -6.16 today.

Today, the preliminary Arctic Oscillation (AO) figure was -0.494. Blocking could largely persist through much of the remainder of July.

Blocking is consistent with warmth on the East Coast during the middle and latter part of summer. Already, even as the July 1-10 period saw a preliminary AO average of -1.108, readings were above and much above normal in the Middle Atlantic region. Should blocking generally persist, a warm or perhaps very warm second half of summer is likely.

Since 1950, there was only a single year that saw the AO average -1.000 or below in May and -0.500 or below in June (the preliminary June 2019 average was -0.665): 1993. 1993 featured much above normal readings in the East during the late summer (August 15-September 15 period) and predominantly cooler than normal readings across the western third of the nation during much of the summer. Some of the early guidance for August hints at above to possibly much above normal readings in parts of the Northeast.

On July 15, the MJO was in Phase 1 at an amplitude of 0.732 (RMM). The July 14-adjusted amplitude was 0.835.

The second half of July will very likely see a continuation of the generally much warmer than normal readings in much of the Middle Atlantic region. Since 1974 when MJO data was first recorded, there have been 6 cases (1988, 1996, 2004, 2008, 2010, and 2013) when the MJO was in Phase 1 at an amplitude of 1.500 or above for 4 or more days during the July 1-10 period. The average temperature for those cases in New York City was 78.2° (1.7° above normal). The latest guidance suggests a mean temperature near 79.5°. In 4/6 (67%) cases, there was at least one heat wave during the July 16-31 period and 4/6 (67%) those cases had a peak temperature of 95° or above during that period.

The implied probability of a warmer than normal July in New York City is currently 81%.

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