bluewave

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.

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.

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

Essentially, one of the snowiest humid subtropical zones in North America during the 2010's.

Mid-Atlantic temperatures and New England snowfall during the 2010's.

One more shot at 100 degree heat index readings tomorrow before a cooler easterly flow pattern arrives.

I believe the 78 degree SST's South of Long Island is a new record for September. NY Harb Entrance 1750 78 78 20 S Fire Island 1750 76 78

Miami dew points return today for the 38th time this year. Amazing run of days at JFK with a maximum dew point of 75 degrees or higher.

https://www.nytimes.com/2018/09/04/climate/outsourcing-carbon-emissions.html https://buyclean.org/media/2016/12/The-Carbon-Loophole-in-Climate-Policy-Final.pdf https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3215011/ https://www.nature.com/articles/s41467-018-04337-y Over the past decade, both the United States and Europe have made major strides in reducing their greenhouse gas emissions at home. That trend is often held up as a sign of progress in the fight against climate change. But those efforts look a lot less impressive once you take trade into account. Many wealthy countries have effectively “outsourced” a big chunk of their carbon pollution overseas, by importing more steel, cement and other goods from factories in China and other places, rather than producing it domestically. Dr. Hasanbeigi is an author of a new report on the global carbon trade, which estimates that 25 percent of the world’s total emissions are now being outsourced in this manner. The report, written with the consulting firm KGM & Associates and ClimateWorks, calls this a “carbon loophole,” since countries rarely scrutinize the carbon footprint of the goods they import. The new report, which analyzes global trade from 15,000 different sectors — from toys and office equipment to glass and aluminum — builds on previous academic research to provide one of the most detailed pictures yet of the global carbon trade. Not surprisingly, China, which has become the world’s largest emitter of carbon dioxide, remains the world’s factory. About 13 percent of China’s emissions in 2015 came from making stuff for other countries. In India, another fast-growing emitter, the figure is 20 percent. Since the financial crisis in 2008, however, the outsourcing of emissions from wealthy countries to developing countries has started to slow. More recently, much of the growth in carbon outsourcing is occurring between developing countries, according to a recent study in Nature Communications. “Just as China’s starting to deal with its emissions, it’s been pushing some of its more carbon-intensive activities into countries like Cambodia, Vietnam and India,” said Steven J. Davis, a scientist at the University of California, Irvine and co-author of that study. “From a climate policy context,” he added, “it’s like a game of whack-a-mole.”

Our last big snowstorm/blizzard with record cold was way back in April 1982. It was also the last time that NYC had 3 consecutive record lows. 4/6 21 in 1982 23 in 1881 24 in 1887 4/7 21 in 1982 23 in 1881 24 in 1943 4/8 25 in 1982 26 in 1972 28 in 1920+

Even though the current ENSO warming is much weaker than 2015, we are getting a similar 500 mb atmospheric response. Notice the big ridge near the Aleutians, Western Trough, and amplified WAR. This is producing the record warm and humid August in September pattern. September 2015 pattern Current 500 mb pattern and forecast

The 596 dam height on the OKX sounding last night was one of the highest on record for the month of September. This follows the extreme February 588 dam cold season record and the early July tie for all-time.

Today makes it the second highest number 90 degree or higher days in a year for LGA. #1....48 days....2010 #2....35 days....2018...2002 #3....34 days....1991 #4....32 days....2016 #5....31 days....1983

First September HX above 100 at Newark during the 2010's. The current 95 degree temperature also beat guidance for today. Newark Liberty PTSUNNY 95 71 45 W9 30.18F HX 102

This may be the first time that we had 100 degree heat index readings on Labor Day around the area. Newburgh MOSUNNY 88 77 70 W9 30.25F HX 100 Montgomery FAIR 89 77 67 S8 30.21F HX 101 Sussex FAIR 88 77 69 SW9 30.24F HX 100

Pretty rare for Boston and San Diego to have a warmest summer month at the same time. I guess this was the weather equivalent of a Boston and San Diego world series. #Boston and #SanDiego are just two of the U.S. cities that had their warmest August on record: 78.1°F in San Diego (records go back to 1874) and 77.4°F in Boston (records go back to 1872). Mild in most of the Great Plains: 6th coolest in Rapid City. cpc.ncep.noaa.gov/products/tanal…pic.twitter.com/PGOnVzbPgK 9:38 AM - 1 Sep 2018

During the 2010's, summer extended into September while fall lingered into December. 2015 was the most extreme example of this so far. That September was warmer than the average June with December like a mild November.

Amazing day 36 with a 75 degree or higher maximum dew point at JFK. Kennedy Intl CLOUDY 76 75 97 W8 30.26S

The dew points were too low for a 100 degree or higher heat index. NEW YORK CITY METROPOLITAN WEATHER ROUNDUP NATIONAL WEATHER SERVICE NEW YORK NY 200 PM EDT TUE SEP 08 2015 CITY SKY/WX TMP DP RH WIND PRES REMARKS CENTRAL PARK SUNNY 96 61 31 VRB3 30.00F HX 96 LAGUARDIA APRT MOSUNNY 93 61 34 SW5 29.97F HX 93 KENNEDY INTL MOSUNNY 89 70 53 S14 30.01S HX 94 NEWARK/LIBERTY MOSUNNY 97 61 30 SW8 29.97F HX 97 TETERBORO APRT MOSUNNY 95 60 31 SW15 29.95F HX 95 BNX BOT. GARD. N/A 93 64 38 CALM 30.00S HX 95

We have a shot at the first September 100 degree heat index readings of the 2010's this week.

It cleared out nicely on LI with sunny skies now. Great afternoon for the beach without the big crowds that we normally get on the Labor Day weekend. http://mp1.met.psu.edu/~fxg1/GOES_PA/loop60.html https://nysea.com/live-cam/

Each melt season seems to confirm that an important shift occurred around 2007. NSIDC is currently at 4.992million sq km for extent and slowly falling. Most of the seasons since 2007 had a daily low minimum extent between 4 and 5 million sq km. Only 2009, 2013, and 2014 managed to stay a little above 5 million sq km. But even those 3 highest years couldn't get back to pre 2007 ice levels near or above 6 million sq km when the Arctic was colder.

Yeah, it's really impressive. The nearest place with average August dew points of 70 or higher is North Carolina. We have seen several instances of temperature and humidity typical for subtropical climates here in recent years.

August was also the first time that any of our local stations had a month with an average dew point of 70 degrees or higher.

Highest average dew point summer on record for both JFK and ISP.