bluewave

ISP is the closet that our area has come to an 80° dew point this year. MacArthur/ISP PTSUNNY 78 78 100 S3

70° minimums have been more impressive than 90° maximums at JFK since the record dew point surge began with the 2015-2016 super El Niño. Time Series Summary for JFK INTERNATIONAL AIRPORT, NY - Jan through Dec Click column heading to sort ascending, click again to sort descending. Rank Year Number of Days Min Temperature >= 70 Missing Count 1 2016 55 0 2 2015 53 0 3 2010 51 0 4 2018 49 0 5 2012 48 0 - 1983 48 0 6 1980 47 0 - 1971 47 0 7 1984 46 0 8 2013 44 0 - 1999 44 0 9 2005 40 0 - 1995 40 0 - 1981 40 0 - 1970 40 0 10 2011 39 0 - 1969 39 0 11 2019 38 0 - 1961 38 0 Time Series Summary for JFK INTERNATIONAL AIRPORT, NY - Jan through Dec Click column heading to sort ascending, click again to sort descending. Rank Year Number of Days Max Temperature >= 90 Missing Count 1 2010 32 0 2 1983 26 0 3 2002 21 0 4 1971 18 0 5 2005 17 0 - 1991 17 0 6 2012 16 0 7 2016 15 0 - 1995 15 0 - 1961 15 0 8 1999 14 0 - 1988 14 0 - 1966 14 0 9 2011 13 0 - 1993 13 0 - 1984 13 0 - 1977 13 0 - 1970 13 0 - 1969 13 0 - 1963 13 0 10 2015 12 0 - 2006 12 0 - 2003 12 0 - 1978 12 0 - 1968 12 0

Another day when the highest temperature misses to our north.

Highs through 2pm... LGA....97 EWR...96 TEB....95 NYC...94 FRG....92 JFK....88 ISP.....88 HWV...87

95° at LGA LaGuardia Arpt PTSUNNY 95 65 37 SW13G22

Pretty impressive marine layer for such a warm air mass.

90° at 10 am. LaGuardia Arpt PTSUNNY 90 65 43 SW8

Yeah, your area is closest to the marine layer again today. ISP starting the day with a 76° dew point and dense fog in the Hamptons. MacArthur/ISP PTSUNNY 76 76 100 SW8 29.98R FOG East Hampton FOG 72 72 99 SW6 29.99R VSB<1/4

These ocean temperatures near 80°have become the norm in recent years. NY Harb Entrance 2150 78

84/72 here along the South Shore.

Higher dew points holding on along the South Shore. 84/72 in Wantagh. Some fog coming ashore now in the Hamptons.

Yeah, the really impressive record high temperatures in recent years have come during the cold season. The new all-time monthly highs of 96°in October 2019 and 80° for February 2018. We have been lucky that the most extreme high temperatures haven’t been in July or August. But we saw that 108° new all time high at Newark in July 2011.

JFK came close on 7-21-19 with a 114/89 high and low on the heat index. https://mesonet.agron.iastate.edu/plotting/auto/?_wait=no&q=153&network=NY_ASOS&zstation=JFK&month=jul&var=max_feel&dpi=100&_fmt=png

Euro maxes out temperatures Sunday and Monday with the highest dew points Monday. Also has convection along a weak front on Monday. Should the convection and clouds hold off, then temperatures and heat indices would be higher Monday.

The minimum temperature departures to our north this month are pretty impressive, BTV...+6.1 ALB...+7.0 POU...+5.8 LGA....+4.8

The margin of the new record Is more impressive to our north if it can hold. Time Series Summary for ALBANY INTERNATIONAL AIRPORT, NY - Month of Jul Click column heading to sort ascending, click again to sort descending. Rank Year Lowest Min Temperature Missing Count 1 2020 62 15 2 2019 57 0 3 2008 56 0 - 2004 56 0 4 2011 54 0 - 2006 54 0 - 2005 54 0 5 2016 53 0 - 2014 53 0 - 2013 53 0 - 2012 53 0 - 1998 53 0 Time Series Summary for NY CITY CENTRAL PARK, NY - Month of Jul Click column heading to sort ascending, click again to sort descending. Rank Year Lowest Min Temperature Missing Count 1 2020 67 15 2 2008 66 0 3 2019 65 0 - 1993 65 0 - 1970 65 0 - 1955 65 0

The warm minimums have been leading the departures In the Hudson Valley. POU is +4.4 so far. Max departure +3.1 and min +5.8. Climatological Data for POUGHKEEPSIE AIRPORT, NY - July 2020 Click column heading to sort ascending, click again to sort descending. Date Max Temperature Min Temperature Avg Temperature Avg Temperature Departure HDD CDD Precipitation Sum 1397 1058 - - 0 191 2.40 Average 87.3 66.1 76.7 4.4 - - - Normal 84.2 60.3 72.3 - 0 120 2.26 Above Normals represent the month through 2020-07-16. 2020-07-01 85 63 74.0 2.7 0 9 0.02 2020-07-02 94 60 77.0 5.5 0 12 0.07 2020-07-03 86 67 76.5 4.9 0 12 0.30 2020-07-04 91 67 79.0 7.2 0 14 0.00 2020-07-05 93 64 78.5 6.6 0 14 0.00 2020-07-06 95 65 80.0 8.0 0 15 0.00 2020-07-07 82 65 73.5 1.3 0 9 0.00 2020-07-08 83 69 76.0 3.7 0 11 1.34 2020-07-09 92 67 79.5 7.1 0 15 0.00 2020-07-10 82 69 75.5 3.0 0 11 0.39 2020-07-11 89 73 81.0 8.4 0 16 0.28 2020-07-12 88 70 79.0 6.3 0 14 T 2020-07-13 87 67 77.0 4.3 0 12 0.00 2020-07-14 88 63 75.5 2.7 0 11 0.00 2020-07-15 84 62 73.0 0.1 0 8 0.00 2020-07-16 78 67 72.5 -0.4 0 8 0.00 2020-07-17 M M M M M M M 2020-07-18 M M M M M M M 2020-07-19 M M M M M M M 2020-07-20 M M M M M M M 2020-07-21 M M M M M M M 2020-07-22 M M M M M M M 2020-07-23 M M M M M M M 2020-07-24 M M M M M M M 2020-07-25 M M M M M M M 2020-07-26 M M M M M M M 2020-07-27 M M M M M M M 2020-07-28 M M M M M M M 2020-07-29 M M M M M M M 2020-07-30 M M M M M M M 2020-07-31 M M M M M M M

Don, that matches up really well with our climate division rankings. New York Climate Division 4 Average Temperature June-August https://www.ncdc.noaa.gov/cag/divisional/time-series/3004/tavg/3/8/1895-2020 201006 - 201008 75.2°F 125 201606 - 201608 74.2°F 124 200506 - 200508 73.9°F 123 201106 - 201108 73.9°F 123 199906 - 199908 73.7°F 121 201206 - 201208 73.4°F 120 201806 - 201808 73.4°F 120 201906 - 201908 73.2°F 118 201506 - 201508 73.1°F 117 194906 - 194908 73.0°F 116

Long Island is on track for another top 5 highest average dew point July. This onshore flow pattern has kept the minimum temperature departures higher than the maximums. ISP has a max temperature departure of +1.7 and a min departure of +3.3. https://mesonet.agron.iastate.edu/plotting/auto/?_wait=no&q=76&network=NY_ASOS&station=ISP&season=jul&varname=dwpf&year=1893&hours=0-23&dpi=100&_fmt=png

I was wondering about that before I read this... https://www.weather.gov/media/owlie/2018-ASOS.pdf There are also some things that you would think affect the readings but generally don’t, such as jet exhaust. There are algorithms (computer code) in ASOS that take these quick fluctuations into account. These algorithms have been developed and tested to provide the most accurate and sensible data for a given sensor by using sampling over a period of time and other methods proven to weed out spikes in the sensor data that are caused by non-meteorological influences.

The actual sensors are located on a grassy strip. All of NYC is within feet of roadways and buildings. So I don’t see anything at that location that varies much from Queens of the other parts of NYC. These are the guidelines for airport ASOS sittings. https://www.faa.gov/documentLibrary/media/Order/6560_20c_ord.pdf

LGA follows the sitting rules at airports. The actual sensors are on a strip of grass with no obstructions. It’s representative of that part of Queens when there is an offshore flow. But it’s right on the water with cooling breeze when the flow in onshore. https://weather.gladstonefamily.net/site/search?site=KLGA

The site was fine before the trees and bushes became overgrown around the sensors. Like you said, the equipment should be located in a clearing away from any trees. The overgrowth really affected the number of 90°days following the ASOS installation in 1996. It artificially reduced the number of 90° days relative to the period before the ASOS. Average annual # 90° days 1970-1989.......2000-2019 NYC...18.0...........15.8 LGA....13.9...........22.3 EWR...23.3...........27.6 JFK....10.5...........11.1 ISP.......5.8.............8.0 Most recent photo in 2013

Yeah, it was part of all the early season close in tropical activity. It will be interesting to see what things look like once we approach the peak of the season. Some of the seasonal models have an active pattern for the Gulf and East Coast.

Yeah, the last 100 at JFK was back in 2013. The 2010-2013 period featured more westerly flow heat events. The subtropical high shifted further north and east since the super El Niño in 2015-2016. So our heatwaves since then have come with much higher humidity and S to SSE flow. But the higher heat indices made it feel like we have had numerous 100 degree days. https://mesonet.agron.iastate.edu/plotting/auto/?_wait=no&q=159&network=NY_ASOS&zstation=JFK&var=feel&dir=aoa&thres=100&month=all&year=2019&dpi=100&_fmt=png