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The coolest air mass so far this season has been pushing into the region. New York City will see the mercury dip below 60° for the first time since June 11th tomorrow morning. The last time the temperature fell below 60° in August in New York City was August 15, 2013 when the thermometer fell to 59°. The current air mass is somewhat colder than that and the potential exists for the temperature to fall to its lowest level in August since August 22, 2007 when the temperature bottomed out at 56°. Some outlying areas could see the temperature fall into the 40s.

Thursday morning could again see the temperature fall toward or below 60° in New York City. Highs both days will be in the lower to middle 70s in the City.

A warmer pattern will likely develop starting next weekend.

Out West, cities such as Flagstaff, Las Vegas, and Phoenix remain on track for their hottest summer on record. Del Rio is in the midst of its record third extreme heat event (Clarke et al., 2014 framework) of the year. The temperature could make a run at the August monthly record on Wednesday and Thursday at Del Rio.

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 August 7. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.33°C and the ENSO Region 3.4 anomaly has averaged +0.12°C. Neutral ENSO conditions will likely evolve into a La Niña event during the early fall.

The SOI was +28.10 today.

The preliminary Arctic Oscillation (AO) was +1.428 today.

Based on sensitivity analysis applied to the latest guidance, there is an implied 60% probability that New York City will have a cooler than normal August (1991-2020 normal). August will likely finish with a mean temperature near 75.6° (0.5° below normal).

 

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25 minutes ago, jm1220 said:

Not when it never starts! 

Yep if the "big pattern" doesn't show up by late January it's likely not coming.  Should have been a warning last year when the January cold was underwhelming and we went right back to the torch after 8 days or so....

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Just now, Brian5671 said:

Yep if the "big pattern" doesn't show up by late January it's likely not coming.  Should have been a warning last year when the January cold was underwhelming and we went right back to the torch after 8 days or so....

In any Nina if we don't see something decent in December it almost certainly won't ever happen. We had the Dec 2020 snowy pattern which came back in Feb, Dec 2010 into Jan 2011, Dec 1995... you know, 1/4/18 which came back in March etc but plenty of other Ninas which were lousy in Dec and stayed that way. 

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Records:

Highs:


EWR: 97 (1983)
NYC: 97 (1955)
LGA: 98 (1955)
JFK: 100 (1983)



Lows:

EWR: 52 (1949)
NYC: 55 (1949)
LGA: 58 (1949)
JFK: 55 (1949)


Historical:

1886 - The 1886 Indianola Hurricane destroyed the town of Indianola, Texas and as such had a significant impact on the history and economic development of Texas. The storm ended the rivalry between Galveston and Indianola as the chief port of Texas. With the abandonment of Indianola and the unwillingness of the former residents to rebuild close to shore, Galveston became the essential Texan port until the 1900 Galveston Hurricane led to the rise of Houston as a major port. It was the fifth hurricane of the 1886 Atlantic hurricane season and one of the most intense hurricanes ever to hit the United States.

1910 - The big blow up of forest fires finally came to an end in Idaho. A record dry August fueled 1736 fires which burned three million acres destroying six billion board feet of timber. The fires claimed the lives of 85 persons, 78 of which were fire fighters, and consumed the entire town of Wallace. The smoke spread a third of the way around the world producing some dark days in the U.S. and Canada. The forest fires prompted federal fire protection laws. (David Ludlum)

1928 - A tornado estimated at F4 intensity initially touched down in Winnebago County, Iowa, moved to Freeborn County, Minnesota, and hit the south side of Austin, MN. Five of the six deaths were in Austin with 60 injuries.

1987 - Half a dozen cities in the Central Plains Region reported record high temperatures for the date, including Pueblo CO with a reading of 102 degrees, and Goodland KS with a high of 104 degrees. Hill City KS reached 106 degrees. (The National Weather Summary)

1988 - Sheridan, WY, reported a record hot temperature reading of 100 degrees. Evening thunderstorms produced golf ball size hail near Fortuna ND, and wind gusts to 70 mph near Webster SD. (The National Weather Summary) (Storm Data)

1989 - Early morning thunderstorms produced heavy rain in southeast Kansas and northeastern Oklahoma, with up to six inches reported around Tulsa OK. Some roads in the Tulsa area were closed by water 10 to 12 feet deep. Evening thunderstorms produced severe weather in northern Oklahoma and southern Kansas. Thunderstorms produced winds gusts to 75 mph in Major County OK, and hail two inches in diameter at Jennings KS. (The National Weather Summary) (Storm Data)

 

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52 overnight.  62 / 40 now and a gorgeous day as we enter day 2 of this 3 day cool period.   Warming each of the subsequent 3 days Thu - Sat with the warmer spots potentially touching 90 by Sun.  Both GFS and Euro have the trough undercutting the ridge Mon - Wd next week which keeps some onshore flow and clouds and heat west before it comes east by next Thu.  Beyond there warmer overall with heat coming in 1-3 day spurts through Labor day. 

8/21 - 8/22 : Cool
8/23 - 8/25:  warming to above normal
8/26 - 8/28 : nearn normal , heat just west onshore flow from cut off
8/29 - 8/31 : Heat comes east
Beyond : Overall warmer look, heat remaining out wets could come in brief expansion   Ridge west, ridging into E-CA

 

https://cdn.star.nesdis.noaa.gov/GOES16/ABI/SECTOR/eus/02/GOES16-EUS-02-1000x1000.gif

 

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