Archives de catégorie : climate-debate

Scientists: No Correlation Between Climate Change And Wildfires In California – Or Anywhere Else On Earth

by K. Richard, Sep 17,2020 in NoTricksZone


A “potential connection” between anthropogenic global warming and the frequency or intensity of wildfires in California has yet to emerge in the trend observations.

Scientists have found a “lack of correlation between late summer/autumn wildfires” and “summer precipitation or temperature” in coastal California. In fact, “there is no long-term trend in the number of fires over coastal California” in the last 50 years (Mass and Ovens, 2019).

mage Source: Marlon et al., 2012

As CO2 concentrations have risen from 300 ppm to 400 ppm (1900 to 2007), the decline in global burned area has been significant (Yang et al., 2014)

Two New Temperature Records Show No Warming In Central Asia Since 1766 A.D. Or In Spain Since 1350 A.D.

by K. Richard, Sep 10, 2020 in NoTricksZone


Scientists continue to publish papers revealing no unusual climate trends for the last several centuries in many regions of the world.

Despite the 135 ppm increase in CO2 concentration (275 ppm to 410 ppm) since the 1700s, a new 250-year temperature (precipitation) reconstruction (Peng et al., 2020) shows there has been no net warming in Central Asia since 1766. Two other reconstructions from this region also show no warming trend in recent centuries.

Earlier this year we highlighted a new study that indicated France was up to 7°C warmer than today about 7800 years ago after cooling by 3°C in the last 200 years.

Another new study (Esper et al., 2020) suggests there has been no net warming in Spain since 1350 A.D.

The years that spanned 1474-1606 A.D. scored 7 of the 10 warmest years in the record. In contrast, there has been only 1 warmest year (1961) and 4 of the 10 coldest years since 1880.

The 2 warmest 30-year (climate) periods occurred in the decades surrounding the ~1530s and ~1820s.

Solar Cycle 25 is here, says NASA

by Oldbrew, Sep 17 , 2020 in  Tallbloke’s Talkshop


Solar Cycle 25 has begun, according to this NASA press release.

During a media event on Tuesday, experts from NASA and the National Oceanic and Atmospheric Administration (NOAA) discussed their analysis and predictions about the new solar cycle – and how the coming upswing in space weather will impact our lives and technology on Earth, as well as astronauts in space.

The Solar Cycle 25 Prediction Panel, an international group of experts co-sponsored by NASA and NOAA, announced that solar minimum occurred in December 2019, marking the start of a new solar cycle.

Because our Sun is so variable, it can take months after the fact to declare this event.

FIRE

by J. Curry, Sep 15, 2020 in WUWT


Subtitle: our failure to live in harmony with nature.

I’m taking a breather today from nonstop hurricane stuff. Well, ‘breather’ may not be quite the right word.

As I’m writing this, I’m looking out into the smoke from the California fires that are blowing into Reno (not to mention much of the rest of the U.S.).  Schools in Reno are supposed to be open (they have a good COVID protocol), but have been closed more than half the time for the past month owing to bad air quality from the fires.

The mantra from global warming activists that manmade global warming is causing the fires, and therefore fossil fuels must be eliminated,  is rather tiresome, not to mention misses the most important factors.  More importantly, even if global warming is having some fractional impact on the wildfires, reducing fossil fuels would fractionally impact the fires but only a time scale of many decades hence.

Climate Scientists Admit Clouds are Still a Big Unknown

by E. Worrall, Sep 12, 2020 in WUWT


The authors assert that if we had a better understanding clouds, the spread of model predictions could be reduced. But there is some controversy about how badly cloud errors affect model predictions, and that controversy is not just limited to climate alarmists.

Pat Frank, who produced the diagram at the top of the page in his paper “Propagation of Error and the Reliability of Global Air Temperature Projections“, argues that climate models are unphysical and utterly unreliable, because they contain known model cloud physics errors so large the impact of the errors dwarfs the effect of rising CO2. My understanding is Pat believes large climate model physics errors have been hidden away via a dubious tuning process, which adds even more errors to coerce climate models into matching past temperature observations, without fixing the original errors.

Climate skeptic Dr. Roy Spencer disagrees with Pat Frank; Dr. Spencer suggests the cloud error biases hilighted by Pat Frank are cancelled out by other biases, resulting in a stable top of atmosphere radiative balance. Dr. Spencer makes it clear that he also does not trust climate model projections, though for different reasons to Pat Frank.

Other climate scientists like the authors of the study above, Paulo Ceppi and Ric Williams, pop up from time to time and suggest that clouds are a significant problem, though Paulo and Ric’s estimate of the scale of the problem appears to be well short of Pat Frank’s estimate.

Whoever is right, I think what is abundantly clear is the science is far from settled.

The Dirty Dozen Tests Of Global Warming Science

by G.H. Sherrington, Sep 11, 2020 in WUWT


Assume for discussion that there has been a change of 1⁰C in the customary global near-surface air temperature, GAST, over the last century. There have been many assertions that this has produced changes. The strength of assertions is greater when a mathematical relation between temperature and the alleged change is established. Here are some relationships to ponder, for the last century or for a significant or available shorter time.

For a 1C change in global temperature –

  1. By how many millimeters does the sea level surface height change?

  2. By how many ppm does atmospheric CO change?

  3. By how many tonnes does the weight of terrestrial vegetation, like forests, change?

  4. By how much does the pH of the oceans change?

  5. By how many sq km does the average area of cloud cover change?

  6. What change is there to the accumulated cyclone index, ACE?

  7. What is the net change to the globalnumber of –

    1. Birds
    1. Land animals
    1. Marine algae
  8. By how many Watt per square metre does the Top of Atmosphere TOA radiation balance change?

  9. By how many tonnes does the weight of ice change –

    1. Over land
    1. Floating on sea
    1. Grounded over sea
  10. By how much does total precipitable rainfall TPW change?

  11. By what number does the number of large bush fires change?

 

By how many tonnes do yields of major food crops change, expressed as tonnes available per person, for example

….

California Has Always Had Fires, Environmental Alarmism Makes Them Worse Than Necessary

by M. Schellenberger,  Sep 10, 2020 in Forbes


….

“California was a very smoky place historically,” says Malcolm North of the US Forest Survey.“Even though we’re seeing area burned that is off-the-charts, it’s still probably less than what used to be burned before Europeans arrived.”

Many reporters note that more area has burned this year in California than at any other point in “the modern period,” but that period began in 1950. For the last half of the 20th Century, the annual area burned in California was just 250,000 acres a year, whereas the best-available science suggests 4.4 and 12 million acres burned in California annually before the arrival of Europeans.

 …
See alsoCalifornia Has Always Had Fires, Environmentalism Makes Them Worse

Claim: Historical climate fluctuations in Central Europe overestimated due to tree ring analysis

by Postdam Institute, Sep 10, 2020 in WUWT


“Was there a warm period in the Middle Ages that at least comes close to today’s? Answers to such fundamental questions are largely sought from tree ring data,” explains lead author Josef Ludescher of the Potsdam Institute for Climate Impact Research (PIK). “Our study now shows that previous climate analyses from tree ring data significantly overestimate the climate’s persistence. A warm year is indeed followed by another warm rather than a cool year, but not as long and strongly as tree rings would initially suggest. If the persistence tendency is correctly taken into account, the current warming of Europe appears even more exceptional than previously assumed.”

To examine the quality of temperature series obtained from tree rings, Josef Ludescher and Hans Joachim Schellnhuber (PIK) as well as Armin Bunde (Justus-Liebig-University Giessen) and Ulf Büntgen (Cambridge University) focused on Central Europe. Main reason for this approach was the existing long observation series dating back to the middle of the 18th century to compare with the tree ring data. In addition, there are archives that accurately recorded the beginning of grape and grain harvests and even go back to the 14th century. These records, as well as the width of tree rings, allow temperature reconstructions. A warm summer is indicated by a wide tree ring and an early start of the harvest, a cold summer by a narrow tree ring and a late start of the harvest. The trees studied are those from altitudes where temperature has a strong influence on growth and where there is enough water for growth even in warm years.

Al Gore Uses Heatwaves, Wildfires To Fuel Global Warming Angst

by V. Richardson, Sep 9, 2020 ClimateChangeDispatch


A burst of wild September weather brought a “climate crisis” warning Tuesday from Al Gore as Californians struggled with heat and wildfires, Atlantic storm trackers raced through the alphabet and Coloradans traded their flip-flops for snow boots.

California firefighters fought to contain 23 active fires that charred a record 2.3 million acres as the state headed into the peak of its fire season fueled by a heatwave. On Sunday, the Los Angeles County town of Woodland Hills set a record at 121 degrees.

“It reached a record high of 121 degrees F in LA county over the weekend,” Mr. Gore tweeted Tuesday. “Extreme heat is fueling a longer, more intense, and more destructive wildfire season in CA. This is what an unabated climate crisis looks like.”

In a warming climate, temperatures become more stable, not less, because the differences between the poles and the equator become smaller, Mr. Taylor said.

“Assuming for the sake of argument that a large temperature swing is a crisis like climate alarmists assert, global warming will make such temperature swings less likely and severe,” he said. “So this is happening despite our recent modest warming, not because of it.”

California’s Creek Fire Creates Its Own Pyrocumulonimbus Cloud

by NASA, September 9, 2020 in WUWT


On Friday September 4, 2020 at about 6:44 PM PDT the Creek Fire began in the Big Creek drainage area between Shaver Lake, Big Creek and Huntington Lake, Calif. NASA’s Suomi NPP satellite captured these images of the fire on Sep. 05 through Sep. 07, 2020. From the series of images the spread of the fire can be seen in the outward movement of the red hot spots, although the huge cloud on the 6th obscures all readings due to its size.

The huge, dense cloud created on Sep. 05 and seen in the Suomi NPP image was a pyrocumulonimbus cloud (pyroCb) and the resulting smoke plume that grew upward was spotted and confirmed on Sep. 06, 2020. A pyrocumulonimbus cloud is also called a cumulonimbus flammagenitus. The origins of the latter word are from the Latin meaning “flame” and “created from.” This perfectly describes a cloud that is caused by a natural source of heat such as a wildfire or volcano. Rising warm air from the fire can carry water vapor up into the atmosphere causing clouds. Any type of convective cloud can be created. In this case, the cumulonimbus, or thunderhead cloud, was created. Precipitation and lightning can also occur with these types of clouds creating a risk that the fire will expand due to increased wind from precipitation downdraft or by creating new fires due to lightning strikes. These are all things that fire managers must keep in mind while continuing to try to fight the fire.

Centennial-Scale Temperature Change During the Common Era Revealed by Quantitative Temperature Reconstructions on the Tibetan Plateau

by Li X. et al., September 3, 2020 in Front.Earth.Sci.


Quantitative palaeotemperature reconstruction is crucial for understanding the evolution of Earth’s climate and reducing uncertainty in future climate predictions. Clarifying the temperature change over the Tibetan Plateau (TP) during the Common Era is critical because it plays a vital role in the prediction of cryosphere changes in such regions under a future warming climate. In this paper, we report a comprehensive synthesis of currently available quantitative temperature records to refine the temperature history of the TP during the Common Era. To date, Common Era quantitative temperature reconstructions are sparse and mainly concentrated in the northeastern TP. Considering seasonal bias of the available quantitative temperature reconstructions, three different composite temperature records for TP were derived, namely the “Standardization” composite, the “Mean annual air temperature anomaly” composite, and the “Mean summer temperature anomaly” composite individually. All the integrated temperature series reveal the Medieval Climate Anomaly and the Little Ice Age, but the start and end timings of these multi-centennial-scale periods and their temperature amplitudes differ. There is strong seasonality in temperature variations on this high plateau, and the 20th century warming was characterized by rapid winter temperature increases, while summer temperatures displayed weak variations. Spatial analysis suggests a relatively consistent signal marking a warm TP during 600–1400 CE and a cold plateau during 1400–1900 CE. Large-scale trends in temperature history for the TP resemble those for China and the Northern Hemisphere. Many factors, such as seasonality of temperature proxies, might lead to uncertainty in the reconstructed series. The results highlight that it is of crucial importance to develop more seasonal temperature reconstructions to improve the reliability of quantitative paleoclimatic reconstructions based on geological records across the TP.

CNN Falsely Blames Climate Change For Siberian Craters

by A. Watts, September 6, 2020 in ClimateChangeDispatch


The phrase “never let a potential climate crisis story go to waste” must be in CNN’s news handbook because this headline has absolutely nothing to do with global warming aka climate change.

The story at CNN titled Massive mystery holes appear in Siberian tundra — and could be linked to climate change is a red herring of the smelliest kind because if the writer Katie Hunt had bothered to do even the simplest of web searches, she would have learned that this crater, peculiar to that part of Siberia, is called a Pingo.

It has been known to western academics since 1825, ruling out the paranoia of “climate change” in recent decades as the cause.

In fact, all Katie had to do was look at Wikipedia for the answer:

Pingos are intrapermafrost ice-cored hills, ranging in height from 3 to 70 m (10 to 230 ft) and 30 to 1,000 m (98 to 3,281 ft) in diameter. They are typically conical in shape and grow and persist only in permafrost environments, such as the Arctic and subarctic.

A pingo is a periglacial landform, which is defined as a non-glacial landform or process linked to colder climates. It is estimated that there are more than 11,000 pingos on Earth. The Tuktoyaktuk peninsula area has the greatest concentration of pingos in the world with a total of 1,350 pingos.

Ocean carbon uptake widely underestimated

by University of Exeter, September5, 2020 in WUWT/Nature


The world’s oceans soak up more carbon than most scientific models suggest, according to new research.

Previous estimates of the movement of carbon (known as “flux”) between the atmosphere and oceans have not accounted for temperature differences at the water’s surface and a few metres below.

The new study, led by the University of Exeter, includes this – and finds significantly higher net flux of carbon into the oceans.

It calculates CO2 fluxes from 1992 to 2018, finding up to twice as much net flux in certain times and locations, compared to uncorrected models.

“Half of the carbon dioxide we emit doesn’t stay in the atmosphere but is taken up by the oceans and land vegetation ‘sinks’,” said Professor Andrew Watson, of Exeter’s Global Systems Institute.

“Researchers have assembled a large database of near-surface carbon dioxide measurements – the “Surface Ocean Carbon Atlas” (http://www.socat.info) – that can be used to calculate the flux of CO2 from the atmosphere into the ocean.

“Previous studies that have done this have, however, ignored small temperature differences between the surface of the ocean and the depth of a few metres where the measurements are made.

Continuer la lecture de Ocean carbon uptake widely underestimated

PROF. NILS-AXEL MÖRNER: “THE APPROACHING GRAND SOLAR MINIMUM AND LITTLE ICE AGE CONDITIONS”

by Cap Allon, September 6, 2020 in Electroverse


Nils-Axel Mörner is the former head of the paleogeophysics and geodynamics department at Stockholm University. He retired in 2005 and since has dedicated his days to disproving the IPPC’s thermageddon nonsense while also warning of a coming Grand Solar Minimum.

Between 1997-2003, Mörner chaired an INTAS project on Geomagnetism & Climate; the project concluded that we, in the middle of the 21st century, had to be back in a new solar minimum with Little Ice Age climatic conditions.

These conclusions were quite straightforward, writes Mörner, and were included in a Special Issue of PRP: Obviously we are on our way into a new grand solar minimum. This sheds serious doubts on the issue of a continued, even accelerated, warming as proposed by the IPCC project. This quite innocent—and very true—conclusion made the publisher take the quite remarkable step to close down the entire scientific journal. This closing down gave rise to turbulence and objections within the scientific community. But it didn’t stop Mörner. He kept publishing scientific works regarding the impending GSM.

In 2015, Mörner’s “The Approaching New Grand Solar Minimum and Little Ice Age Climate Conditions” was published. It suggests that by 2030-2040 the Sun will experience a new grand solar minimum. This is evident from multiple studies of quite different characteristics, writes Mörner: the phasing of sunspot cycles, the cyclic observations of North Atlantic behavior over the past millennium, the cyclic pattern of cosmogenic radionuclides in natural terrestrial archives, the motions of the Sun with respect to the center of mass, the planetary spin-orbit coupling, the planetary conjunction history, and the general planetary-solar-terrestrial interaction.

During the previous grand solar minima—i.e. the Spörer Mini-mum (ca 1440-1460), the Maunder Minimum (ca 1687-1703) and the Dalton Minimum (ca 1809- 1821)—the climatic conditions deteriorated into Little Ice Age periods.

 …
see also  SEPTEMBER SNOW IS “A BIG DEAL FOR EVERYONE WHO FARMS” — WELCOME TO THE GRAND SOLAR MINIMUM

Sceptical covid-19 research and sceptical polar bear science: is there a difference?

by Polar Bear Science, September 6, 2020


This essay about medical researchers having trouble getting their papers published because the results don’t support the official pandemic narrative has disturbing parallels with my experience trying to inject some balance into the official polar bear conservation narrative.1 Especially poignant is the mention of models built on assumptions sold as ‘facts’ that fail once data (i.e. evidence) become available – which of course is the entire point of my latest book, The Polar Bear Catastrophe That Never Happened.

Read the commentary below, copied from Lockdownsceptics.org (6 September 2020). Bold in original, link added to the story to which this is a response, and brief notes and links added as footnotes for parallels with polar bear conservation science.

Challenging IChemE climate scaremongering

by D.  Wojick, September 2, 2020 in WUWT


The Institution for Chemical Engineers (IChemE) is a prestigious international group of scientists and professionals with over 35,000 members in about 100 countries. IChemE has been conducting what it calls a consultation on its draft Position Statement on Climate Change. This basically means that the members are invited to submit comments. Given that many engineers are skeptical of the climate scare, it will be interesting to see if all of these comments are made public.

The draft statement itself is pure alarmism. They say the science is settled, per the IPCC, and catastrophe looms. Here is the opening paragraph:

“Climate science is established – global climate change is upon us, exacerbated by human activities. IChemE accepts the veracity of the science and its conclusions published by the Intergovernmental Panel on Climate Change (IPCC). To avoid irreparable social, economic and environmental damage, it is essential that we accelerate our efforts to decarbonize our economic systems and stabilize the levels of greenhouse gases in the earth’s atmosphere, if we are to have any chance of limiting the global average temperature rise to 1.5 degrees C, beyond which catastrophic consequences are more likely. Action needs to be global and fair, recognizing the relative differences between regions, both in terms of historic contributions to emissions and vulnerability to the consequences of a warming planet.

Chemical engineers are uniquely placed to take action in the industries that contribute to greenhouse gas emissions to arrest and reverse the damage we humans are doing to the life support systems of our single, shared planet .” (Emphasis added).

Not only do they simply sing the IPCC song, they even get it wrong. Nowhere does the IPCC suggest that 1.5 degrees of warming (with one degree already on their books) is a threshold to catastrophe. In fact the Paris Accord target is still 2.0 degrees. The last sentence may explain IChemE’s fervent catastrophism. Its members are positioned to make huge sums of money doing the engineering to decarbonize the world. After all, CO2 emissions are typically the product of chemical reactions (including combustion).

An Unremarkable Summer

by P. Homewood, September 3, 2020 in NotaLotofPeopleKnowThat


Despite a few warm days in early August, the month as a whole was not unusually hot, a full 1.6C cooler than August 1995, according to the Central England Temperature series. Other hotter Augusts include 1911, 1947 and 1975.

It was even colder than 1736 and 1899.

Summer as whole was even less remarkable, ranking 51st, tied with years such as 1701, 1731 and 1780.

The summers of 1976 and 1826 remain the two hottest on record, well above anything seen since.

https://www.metoffice.gov.uk/hadobs/hadcet/data/download.html

Que nous apprend l’Optimum Climatique Romain?

by A. Préat, 4 septembre 2020 in ScienceClimatEnergie


SCE a plusieurs fois rapporté que la période actuelle de réchauffement n’est pas exceptionnelle, qu’elle fait partie de cycles décennaux à pluriséculaires de refroidissement et réchauffement qui ont lieu dans des fourchettes de température fort modestes, de l’ordre de 0,15°C par 10 ans. SCE a aussi montré que le CO2 tant incriminé dans ces changements, et surtout l’actuel, n’avait pas de raison d’être, ce gaz venant après l’augmentation de température. Le ‘bouton CO2 ‘ à même d’expliquer ou de ‘justifier’ le battage médiatique quasi-quotidien est donc à ‘la remorque’ de la température et, l’hypothèse de l’effet de serre reste avant tout une hypothèse (exemple ici).

Enfin SCE a souvent rappelé (ici et ici) que la concentration atmosphérique de CO2 n’a jamais été aussi basse dans l’histoire géologique de notre planète, qui a connu la plupart du temps des  concentrations jusqu’à 25 fois supérieures au cours du Phanérozoïque (à partir du Cambrien, il y a 541 millions d’années), et même encore bien plus élevées au cours du Précambrien. Nous partirons de ce dernier point, puisque les médias et scientifiques sont toujours  à nous rappeler, de manière assez dramatique, que la teneur actuelle est plus élevée que celle des ‘derniers’ millions d’années (articles médiatiques presque quotidiens, exemple ici parmi une pléthore d’articles). Est-ce bien le cas? et si oui –et toujours pour ces ‘derniers’ millions d’années– quid de la température ?

About That Sharp Rise in Climate Concern

by Donna Laframboise, September 2, 2020 in BigPicturesNews


Poll sponsors say climate attitudes have been ‘remarkably consistent’ over two decades.

A few days ago, Scientific American reprinted an article straight from Climatewire. Titled Republican Convention Ignored Climate Threat, But Americans’ Attitudes Are Shifting, it says “Polling shows that voter concern about climate change has been growing for years and that it has not diminished as a result of the coronavirus pandemic.” We’re then told about a recent public opinion survey affiliated with Stanford University.

Debunking Popular Climate Myths About CO2

by N. Thorner, October 25, 2019 in ClimateChangeDispatch


If you believe the debate over global warming has ever been about science—or for that matter climate—you have been conditioned, through formal education or through reports warning of doom and gloom, to believe what others rightly describe as a world-wide hoax concocted to unite the world under a single socialistic government where there is no capitalism, no democracy, and no freedom.

Why is exposing the truth so important? Because it has everything to do with the redistribution of wealth and the establishment of political agendas aimed at destroying the foundation of eastern democracies and free markets.

Accordingly, it is therefore critical for everyone to become informed so free and open debate can exist, rather than the suppression and falsification of actual scientific climate data.

This article will expose some of the popular climate myths about CO2, so the reader will be equipped with ammunition to spread the truth to those who are willing to listen and have not yet become environmental extremists.

Links are included after each myth to substantiate information and to provide reference material for further interest and clarification.

The article was written using individual articles, with permission from my friend Jay Lehr, Ph.D., in which he exposed popular climate myths related to CO2. Jay Lehr is a Senior Policy Analyst for The International Climate Science Coalition.

Myth #1:  Carbon dioxide emissions cause catastrophic global warming.

Claim: Sea level rise from ice sheets track worst-case climate change scenario

by University of Leeds, September 1, 2020 in WUWT/Nature


Ice sheets in Greenland and Antarctica whose melting rates are rapidly increasing have raised the global sea level by 1.8cm since the 1990s, and are matching the Intergovernmental Panel on Climate Change’s worst-case climate warming scenarios.

So far, global sea levels have increased in the most part through a mechanism called thermal expansion, which means that volume of seawater expands as it gets warmer. But in the last five years, ice melt from the ice sheets and mountain glaciers has overtaken global warming as the main cause of rising sea levels.

Dr Ruth Mottram, study co-author and climate researcher at the Danish Meteorological Institute, said: “It is not only Antarctica and Greenland that are causing the water to rise. In recent years, thousands of smaller glaciers have begun to melt or disappear altogether, as we saw with the glacier Ok in Iceland, which was declared “dead” in 2014. This means that melting of ice has now taken over as the main contributor of sea level rise. “

###

Further information

The study, “Ice-sheet losses track high-end sea-level rise projections,” is published today (31 August) in Nature Climate Change.

View towards Icefjord in Ilulissat. Easy hiking route to the famous Kangia glacier in Greenland. The Ilulissat Icefjord seen from the viewpoint. Declared a UNESCO World Heritage Site in 2004. Photo taken in Greenland.

FRANCE BREAKS MONTHLY COLD RECORD

by Cap Allon, September 1, 2020 in Electoverse


Europe’s punishing late-summer cold front has been busy taking names across the western half of the continent.

The UK has just suffered-through one of it coldest August Bank Holiday weekends ever recorded, the Alps and Pyrenees have recently received heavy summer snow, and now the French are reporting all-time record August lows:

As reported by meteo.bzh, a monthly cold record has just been broken at the Brest-Guipavas airport –located in NW France– where a minimum temperature of 5.8C (42.4F)was registered.

A plunging Arctic air mass was responsible — a phenomenon on the increase due to the historically low solar activity we’re receiving (see meridional jet stream flow). A lack of wind and the absence of cloud cover at night also contributed to the plummeting temps, according to meteo.bzh.

GFS 2m Temp Anomalies from Aug 31 [tropicaltidbits.com].