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September 2018 Discussions & Observations Thread


Rtd208

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Record High Minimum Temperatures for 9/6 (Preliminary)

Atlantic City: 78° (old record: 74°, 1953, 1985, and 1999)
Bridgeport: 78° (old record: 75°, 1985)
Harrisburg: 75° (old record: 74°, 1898 and 1985)
Hartford: 73° (old record: 72°, 1983)
Islip: 76° (old record: 75°, 1985)
New Haven: 77° (old record: 72°, 1953 and 1985)
New York City-LGA: 79° (tied record set in 1985)
New York City-NYC: 78° (tied record set in 1985)
Newark: 77° (tied record set in 1985)
Philadelphia: 78° (old record: 76°, 1898)
Poughkeepsie: 71° (tied record set in 1985)
Sterling: 72° (tied record set in 1996)
Washington, DC: 78° (old record: 77°, 1983)
Westhampton: 75° (old record: 72°, 1953 and 1999)

 

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43 minutes ago, donsutherland1 said:

Record High Minimum Temperatures for 9/6 (Preliminary)

Atlantic City: 78° (old record: 74°, 1953, 1985, and 1999)
Bridgeport: 78° (old record: 75°, 1985)
Harrisburg: 75° (old record: 74°, 1898 and 1985)
Hartford: 73° (old record: 72°, 1983)
Islip: 76° (old record: 75°, 1985)
New Haven: 77° (old record: 72°, 1953 and 1985)
New York City-LGA: 79° (tied record set in 1985)
New York City-NYC: 78° (tied record set in 1985)
Newark: 77° (tied record set in 1985)
Philadelphia: 78° (old record: 76°, 1898)
Poughkeepsie: 71° (tied record set in 1985)
Sterling: 72° (tied record set in 1996)
Washington, DC: 78° (old record: 77°, 1983)
Westhampton: 75° (old record: 72°, 1953 and 1999)

 

Don, great stats. It ill be interesting to see if ISP and BDR can hold those lows through midnight. Those would be the highest minimums for the entire month of September. Several stations already set their 2nd warmest September minimum on record during this heat wave.

Highest September minimums:

ISP....75....2015...1985..1980

BDR..76.....2015

2nd highest September minimums

LGA

#1....81....2010

#2....80....2018

EWR

#1...79...1973

#2...78...2018....2016....1993....1961

JFK

#1....77....2016...1985...1983

#2....76....2018....1993

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1 hour ago, bluewave said:

Don, great stats. It ill be interesting to see if ISP and BDR can hold those lows through midnight. Those would be the highest minimums for the entire month of September. Several stations already set their 2nd warmest September minimum on record during this heat wave.

Highest September minimums:

ISP....75....2015...1985..1980

BDR..76.....2015

2nd highest September minimums

LGA

#1....81....2010

#2....80....2018

EWR

#1...79...1973

#2...78...2018....2016....1993....1961

JFK

#1....77....2016...1985...1983

#2....76....2018....1993

I see 1985 in many of these records- the same year that Gloria hit us in September.  This has been a crazy summer for high dew points and high minimums.  JFK has had a weirdly "low" amount of 90 degree days, but it has most certainly felt like it exceeded 90 on at least 15-20 days.  This was the hottest summer I've felt here since the early part of the decade.

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17 hours ago, NewYorkweatherfan said:

I’m sorry but In no way in hell is New York metro including  Long Island part of mid Atlantic. It’s just not! We have a way different climate here. It’s a different region. Simple as that! 

To be fair, this entire summer it has felt more like Florida here than anywhere else.

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11 hours ago, LongBeachSurfFreak said:

I’m assuming that super impressive NYC 97 is from that incredible and sustained heatwave that killed a ton of people. That was the 1800s equivalent of one of our stuck patterns. Unc posted some great stuff on that a couple years ago. I would have to imagine we see something like that but more intense some time in the next few years Northern Europe had that this summer. Where records are just crushed. 

I’ll call it the forky pattern 

I think 2010 was our hottest summer, and we seem to get a recurrence of bake off summers every 11 years or so, 2021 could be our next one.

 

Funny thing is it seems like the more north you go the more 90 degree days- Boston has had higher temps than us and Portland ME set a new record for most 90 degree days this summer- I think it was either 30 or 31?  Less rainfall up there might have had something to do with it.

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27 minutes ago, LibertyBell said:

I see 1985 in many of these records- the same year that Gloria hit us in September.  This has been a crazy summer for high dew points and high minimums.  JFK has had a weirdly "low" amount of 90 degree days, but it has most certainly felt like it exceeded 90 on at least 15-20 days.  This was the hottest summer I've felt here since the early part of the decade.

This was the highest average dew point summer on record at JFK. Today is the 39th day at JFK this year with a 75 degree or maximum dew point. That record is off the charts compared to past years. This was also the highest average dew point summer and first time any month had a 70 degree or higher average dew point. Humidity this high is normal for parts of North Carolina and Virginia during the summer. Just another example of the humid subtropical climate zone shifting further to the north.

1072269560_Screenshot2018-09-06at9_55_51AM.thumb.png.b8e2acf161b70f3e04a5f0abab1b59a0.png

network-NY_ASOS--station-JFK--season-aug--varname-dwpf--year-1893--dpi-100.png.48aa2f85c88619c10ad45a1006c7dc35.png

network-NY_ASOS--station-JFK--season-summer--varname-dwpf--year-1893--dpi-100.png.8db34b7a16e9c60a483fac95565c577e.png

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30 minutes ago, bluewave said:

This was the highest average dew point summer on record at JFK. Today is the 39th day at JFK this year with a 75 degree or maximum dew point. That record is off the charts compared to past years. This was also the highest average dew point summer and first time any month had a 70 degree or higher average dew point. Humidity this high is normal for parts of North Carolina and Virginia during the summer. Just another example of the humid subtropical climate zone shifting further to the north.

1072269560_Screenshot2018-09-06at9_55_51AM.thumb.png.b8e2acf161b70f3e04a5f0abab1b59a0.png

network-NY_ASOS--station-JFK--season-aug--varname-dwpf--year-1893--dpi-100.png.48aa2f85c88619c10ad45a1006c7dc35.png

network-NY_ASOS--station-JFK--season-summer--varname-dwpf--year-1893--dpi-100.png.8db34b7a16e9c60a483fac95565c577e.png

Thanks Chris, so my subjective feel of heat was not unwarranted.  Will we get to 40 75 degree dew point days at JFK?  Out of curiosity what are the top five and where do years like 2010, 1983, 1993, 1991, etc fit into the list?  And how does JFK's record setting summer compare to other local spots like LGA, NYC and EWR?  JFK seems to be the hot spot for high dew points this summer thanks to a persistent southerly wind.

I see the previous record holder for JFK is 24 days in 1983 and not one other year higher than 19 and 1983 was post el nino so I'm wondering if we get that el nino this winter if next summer might be even worse? And maybe add a few 100 temp days to the mix?

 

 

Wow I looked up 2010- our hottest summer and most 90 degree days by far- only had 4 75+ dew point degree days?!

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4 minutes ago, Gravity Wave said:

Half the buildings in this city need to be torn down anyway, the dewsaster is a good excuse to speed things up.

Yeah I'm hearing reports on people not even being able to get their water running.  NYCHA is a disaster.  We're having low water problems on Long Island too for some reason.  Weird thing is the hot water runs fine (because it's stored in a hot water heater tank?) while cold water is suffering from low flow.  I heard something similar has been going on this summer in the city.

 

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43 minutes ago, LibertyBell said:

Thanks Chris, so my subjective feel of heat was not unwarranted.  Will we get to 40 75 degree dew point days at JFK?  Out of curiosity what are the top five and where do years like 2010, 1983, 1993, 1991, etc fit into the list?  And how does JFK's record setting summer compare to other local spots like LGA, NYC and EWR?  JFK seems to be the hot spot for high dew points this summer thanks to a persistent southerly wind.

I see the previous record holder for JFK is 24 days in 1983 and not one other year higher than 19 and 1983 was post el nino so I'm wondering if we get that el nino this winter if next summer might be even worse? And maybe add a few 100 temp days to the mix?

 

 

Wow I looked up 2010- our hottest summer and most 90 degree days by far- only had 4 75+ dew point degree days?!

Yeah, the 2010 summer had much lower humidity. The humidity really spiked here during and after  the super El Nino in 2015-2016. So that gets superimposed on the long term rising dew point trend. While the current ENSO warming can't compare to September 2015, the current 500 mb pattern and record warm temperatures are  remarkably similar. So it will be interesting to see how things evolve going through the fall into the winter.

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8 minutes ago, bluewave said:

Yeah, the 2010 summer had much lower humidity. The humidity really spiked here during and after  the super El Nino in 2015-2016. So that gets superimposed on the long term rising dew point trend. While the current ENSO warming can't compare to September 2015, the current 500 mb pattern and record warm temperatures are  remarkably similar. So it will be interesting to see how things evolve going through the fall into the winter.

Based on temp/humidity combo and looking at these graphs, my thinking is that 1983 was our "hottest feeling" summer because it had the most 90 degree days (37 for NYC and the record for JFK prior to 2010- I think 21 there?) combined with the most 75+ degree dew point days.  Maybe that can be topped by next summer too.

 

With the rising dew point trend combined with rising rainfall totals, do you think 100 degree temp days will become more rare or will they all increase simultaneously, but the number of 100 degree temp days will increase more slowly than they otherwise would because of higher dew points and rainfall totals?

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1 hour ago, LibertyBell said:

Based on temp/humidity combo and looking at these graphs, my thinking is that 1983 was our "hottest feeling" summer because it had the most 90 degree days (37 for NYC and the record for JFK prior to 2010- I think 21 there?) combined with the most 75+ degree dew point days.  Maybe that can be topped by next summer too.

 

With the rising dew point trend combined with rising rainfall totals, do you think 100 degree temp days will become more rare or will they all increase simultaneously, but the number of 100 degree temp days will increase more slowly than they otherwise would because of higher dew points and rainfall totals?

The extreme humidity this year at JFK made it feel much hotter.While this year at JFK had a much lower 90 degree day count than 2010, the 90 degree heat index hours were similar.

JFK

2010

32 days of 90 

197 hours of a 90 heat index

2018

8 days so far of 90 

192 hours so far with 90 degree heat index

1983

26 days of 90

239 hours with 90 heat index

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36 minutes ago, donsutherland1 said:

Record High Temperatures for 9/6 (through 12:00 PM)

Portland: 91° (old record: 88°, 1880, 1884, and 1983)
Westhampton: 85° (tied record set in 2015)

 

Don, has Portland set a new record for number of 90 degree days this year and if so why have they had more "hot" days than we have had?

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39 minutes ago, bluewave said:

The extreme humidity this year at JFK really made the difference in how hot it felt. While this year at JFK had a much lower 90 degree day count than 2010, the 90 degree heat index hours were similar.

JFK

2010

32 days of 90 

197 hours of a 90 heat index

2018

8 days so far of 90 

192 hours so far with 90 degree heat index

1983

26 days of 90

239 hours with 90 heat index

Oh wow thanks Chris, so they do keep heat index records!  Was 1983 the only year with more than 200 hours of a 90 heat index? Just one hour short of 10 whole days wow!

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4 hours ago, bluewave said:

Don, great stats. It ill be interesting to see if ISP and BDR can hold those lows through midnight. Those would be the highest minimums for the entire month of September. Several stations already set their 2nd warmest September minimum on record during this heat wave.

Highest September minimums:

ISP....75....2015...1985..1980

BDR..76.....2015

2nd highest September minimums

LGA

#1....81....2010

#2....80....2018

EWR

#1...79...1973

#2...78...2018....2016....1993....1961

JFK

#1....77....2016...1985...1983

#2....76....2018....1993

I agree. Also, LGA’s 80 degree minimum temperature on 9/4 was the latest on record.

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