bluewave

As of 2003, the NWS seemed resigned to the issue. Central Park Weather: Vegetative Overgrowth Affecting Weather Readings - WABC-TV (New York-WABC, August 22, 2003) - Forecasting the weather is not easy. Government equipment can often be blamed for giving faulty weather information. As Bill Evans explains, a big culprit may be some of the equipment buried in Central Park. Rainfall, snowfall, and the temperature are all vital information recorded 24 hours a day at the weather station located in the heart of Central Park. But meteorologists like Michael Schlacter have serious concerns about the accuracy of the stations data. It sits amid overgrown vegetation and he says thats the problem. The leaves can trigger snow gauges and trees can warp rain and wind measurements. On this hot day, a temperature gauge is in the shade instead of direct sunlight. Michael Schlacter, Weather 2000: "Its kind of like driving a car without a speedometer, odometer, and gas gauge. You are running with false information." The weather instruments at Belvedere Castle have long adorned the top. There used to be a government meteorologist here in the city to keep an eye on them. But now the nearest meteorologist is 60 miles that way. But National Weather Service meteorologists say they knew the weather readings in the park would never be as keenly accurate as the ones at the airports where guidelines prevent foliage from being within 100 feet of the station. Schlacter: "We knew that at times we would have flaky readings, that leaves would fall in gauges, that we would have problems with visibility sensors." [NWS Meteorologist-in-Charge Michael] Wyllie says the weather station is there because it was historically significant to maintain its presence in the park. He says theres been a lot of growth because of the wet spring at so much in fact that temperatures have routinely been recorded lower in the park than at the airports. Wyllie: "We are actually having a micro climate system there because of the vegetation." Imperfect perhaps but nonetheless the system provides the official record of weather for the country's largest city. And Michael Schlacter says its a city that deserves better. Schlacter: "I think New Yorkers deserve a lot better, and I think they deserve the best weather station money can buy." Copyright 2003 ABC Inc., WABC-TV Inc.

Yeah, impressive gradient for late July.

The risk of crop failures would be too high. https://www.theguardian.com/environment/2018/aug/08/reflecting-suns-rays-would-cause-crops-to-fail-scientists-warn Proposals to combat climate change by reflecting the sun’s rays back into space would cause widespread crop failure, cancelling out any benefits to farming from the reduction in warming, according to new research.

2011-2020 had the most 90° days. You can see how the tree growth over the equipment in Central Park has held the 90°days down relative to EWR and LGA. This was the first decade that any of our stations averaged 30° days reaching 90° a year. #90° days 1951-1960…..EWR…25….NYC…18….LGA….19 1961-1970…..EWR…22….NYC…20…LGA….14 1971-1980….EWR….21…..NYC…18….LGA….12 1981-1990….EWR…26…..NYC…18….LGA….15 1991-2000…EWR…28…..NYC….19….LGA….19 2001-2010…EWR…27……NYC….15….LGA….23 2011-2020….EWR…30…..NYC….18….LGA….24 1951-1980….EWR…23……NYC…18...LGA…15 2011-2020...EWR…30…….NYC…18…LGA…24 …………………EWR….+7…….NYC…0….LGA…+9

Everything has felt a bit early this year. We got the big snowstorm in February before the -5 AO drop instead of after. The AO reversal in February was faster than we typically see with such a strong -AO winter. June featured record heat which we typically experience in July. Then July had an early tropical storm with record monthly rainfall. In the past, the deluge or a tropical system after 100°heat happened much later.

The only relationship that I can see between those summers was the timing of the ENSO. The hottest of those Julys were La Niña. Either El Niño winter to La Niña summer or a continuation of La Niña. But the last several winters haven’t matched the expected patterns for the ENSO with coupling issues. It’s interesting that last July was the hottest on record at LGA and a top 10 warmest at Central Park. Also notice that the Julys since the 1990s would be warmer if it wasn’t for the canopy of trees cooling the sensor below. The summers that you highlighted bolded plus the hot 2020 July 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 Mean Avg Temperature ENSO 1 1999 81.4 La Niña to La Niña 2 2010 81.3 El Nino to La Nina 3 1955 80.8 La Niña to La Niña 4 1952 80.3 5 2011 80.2 6 1993 80.1 7 2020 80.0 - 1908 80.0 8 2013 79.8 9 1966 79.7 El Niño to La Niña 10 2019 79.6 - 1949 79.6 11 1983 79.5 12 1994 79.4 - 1944 79.4 13 1988 79.3 El Niño to La Niña - 1980 79.3 0 14 1876 79.2 0 15 1995 79.1 0 - 1887 79.1 0 16 1977 79.0 Weak El Niño

It will be interesting to see if we eventually get a ridge rebound in August. The latest EPS weeklies continue with the New England trough theme into early August. I don’t think that the New England crew was expecting this after the warmest June on record. Jul 26-Aug 2 Aug 2-Aug 9

Big 500 mb pattern change this July compared to 2018-2020.The record WAR, which dominated in recent years, was finally dwarfed by the ridge over Western North America. So the Northeast is experiencing a cooler July than the last three years.

Newark is on track for its first summer since 2010 with more 95° days in June than July. Monthly Number of Days Max Temperature >= 95 for NEWARK LIBERTY INTL AP, NJ Click column heading to sort ascending, click again to sort descending. Year Jun Jul Aug Mean 2 6 2 2021 8 3 M 2020 0 6 0 2019 0 5 0 2018 2 3 3 2017 2 2 0 2016 0 7 5 2015 0 3 2 2014 0 3 0 2013 1 8 0 2012 5 11 1 2011 3 13 1 2010 3 11 4

This was the wettest first 3 weeks of July on record for many stations in the Northeast. So it’s no surprise that all the clouds and rain have kept the high temperatures down. It also resulted in warmer minimums across the board. So the the record heat at the end of June remains the strongest heat of the summer to date.

Currently getting the heaviest downpour of the day here in SW Suffolk.

Heavy thunderstorm in SW Suffolk continuing the wet July theme.

https://www.reuters.com/article/us-china-weather-henan/central-chinas-henan-province-swamped-after-heaviest-rain-in-1000-years-idUSKBN2EQ2CF From Saturday to Tuesday, 617.1 mm (24.3 inches) of rain fell in Zhengzhou, almost the equivalent of its annual average of 640.8 mm (25.2 inches). The three days of rain matched a level seen only “once in a thousand years”, meteorologists said. Like recent heatwaves in the United States and Canada and extreme flooding seen in western Europe, the rainfall in China was almost certainly linked to global warming, scientists told Reuters. “Such extreme weather events will likely become more frequent in the future,” said Johnny Chan, a professor of atmospheric science at City University of Hong Kong. “What is needed is for governments to develop strategies to adapt to such changes,” he added, referring to authorities at city, province and national levels.

Yeah, one of the stronger July MJO phase 5 patterns that we have seen.

That has been the story of this month so far. Clouds and rain have kept the maxes down and the mins up. HPN is similar to other stations in that regard. July HPN…max…-1.9…..min….+1.6 LGA…max…..-1.1…..min….-0.4 EWR…max...+1.0….min…..+1.9 ISP…..max…-0.9…..min…..+1.3

The magnitude of the warm up next week will probably come down to the strength of the Greenland block. The runs with stronger blocking have more of a 50/50 low near New England. The 0z runs kept the strongest heat to our south. But a weaker block in future runs would allow more warming into our area. New run strongest heat stays south Old run had less blocking and more heat into our area

Yeah, I can’t remember visibility down to only 2 miles at any of our airports in smoke before. LGA 20 Jul 2:51 pm 87 65 48 NW 8 2.00 Haze SCT050,SCT060,BKN250

Zones of record drought and flash flooding across the entire Northern Hemisphere. These stuck weather patterns are enhancing the dry and wet extremes across the globe.

Really extreme situation when 8 inches of rain falls in one hour. https://www.reuters.com/business/environment/dozen-central-chinese-cities-under-water-river-banks-burst-2021-07-20/ In Zhengzhou, the capital of Henan on the banks of the Yellow River, more than 200 mm of rain fell in one hour on Tuesday, forcing the city to stop all subway train services.

Yeah, devastating urban flash flood disaster there.

If you thought that the recent NYC subway flooding was bad…

Visibility steadily dropping with all the smoke. Some local stations are actually under 5 miles now. You can smell the smoke outside. 20 Jul 10:53 am 81 66 62 WNW 7 4.00 Haze CLR 29.46 29.95 20 Jul 9:53 am 79 66 65 N CALM 5.00 Haze CLR 29.46 29.95 20 Jul 8:53 am 75 66 74 6.00 Haze CLR 29.46 29.95 20 Jul 7:53 am 72 66 83 SW 5 7.00 CLR