donsutherland1

Because they were multiple fires that merged into a single massive blaze.

Here’s the attribution study. https://www.worldweatherattribution.org/wp-content/uploads/WWA-Prolonged-heat-Siberia-2020.pdf At this point, at least within the scientific realm, the argument about climate change is a settled one. Anthropogenic greenhouse gas emissions are the dominant driver of the ongoing observed warming.

Select snowfall amounts for September 8: Casper: 5.2” (old record: 0.2”, 1962) ...2-day total: 7.5” (with yesterday’s 2.3” the earliest measurable snowfall on record) Cheyenne: 0.5” Lander, WY: 2.7” (old record: 2.4”, 1962) ...2-day total: 4.7”

I hope we get some blocking this winter. Otherwise, it could be a really depressing season.

Tomorrow will be partly to mostly cloudy. Temperatures will likely still rise into the lower 80s in many parts of the region. Overall, the first half of September will likely wind up somewhat warmer than normal. The probability of the arrival of an autumn-like air mass near or just after mid-month has increased. Following the historic heat in the Southwest, very cold air has plunged into the Rockies. Already, yesterday Casper recorded its earliest measurable snowfall on record. Numerous cities set record low maximum temperatures today. Select examples include: Casper: 33° (old record: 46°, 1941) ***earliest high temperature below 40°; prior record September 13, 1970: 39°*** Cheyenne: 32° (old record: 36°, 1929) Lander, WY: 34° (old record: 49°, 1962) ***earliest high temperature below 40°; prior record: September 11, 1903: 37°*** In addition, at 8 pm EDT, Denver was receiving light snow. Snow accumulations are likely tonight. Numerous record low temperatures will be established. The ENSO Region 1+2 anomaly was -1.6°C and the Region 3.4 anomaly was -0.9°C for the week centered around September 2. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.08°C and the ENSO Region 3.4 anomaly has averaged -0.72°C. La Niña conditions are now developing. The SOI was -2.61. Today, the preliminary Arctic Oscillation (AO) figure was +1.270. On September 7, the MJO was in Phase 3 at an amplitude of 0.751 (RMM). The September 6-adjusted amplitude was 0.723. Since 1990, there have been 11 La Niña events, 6 of which followed an El Niño winter. 10/11 (91%) case saw warmer than normal September. All 6 following an El Niño winter were warmer than normal. September mean temperatures for New York City for those cases were: 11 cases: 69.9°; Subset of 6 cases: 70.8°; Entire 1990-2019 period: 69.0°. The September mean temperature for all La Niña and neutral-cool cases following an El Niño winter (1950-2019: n=13) was 69.9°. Overall, the evolution of ENSO, along with the observed ongoing monthly warming (1.6°/decade in NYC and 1.5°/decade in the Northeast Region during September 1990-2019), favors a warmer than normal September. Since 1950, there have been five cases where a La Niña developed during June-July-August or afterward following an El Niño winter. 4/5 (80%) of those cases saw a predominant EPO+/AO+ winter pattern. The most recent such case was 2016-17. 9/10 (90%) of the La Niña winters that followed an El Niño winter featured a predominantly positive EPO. Based on sensitivity analysis applied to the latest guidance, there is an implied 63% probability that New York City will have a warmer than normal September. September will likely finish with a mean temperature near 69.5°.

Denver reached 32 degrees earlier today. It’s now had its first freeze.

The findings in Mann’s paper were largely reaffirmed. https://ral.ucar.edu/projects/rc4a/millennium/refs/Wahl_ClimChange2007.pdf The body of evidence behind AGW is robust. There is no compelling alternative, much less one that has even a fraction of support in the literature that exists for AGW. Actually, I believe the issue isn’t that climate science hasn’t proved its case so to speak, but that those who reject the overwhelming evidence for AGW are demanding a level of certainty not expected from other fields or disciplines.

Thanks Bdgwx.

Some webcams in the Casper area: https://www.wyoroad.info/highway/webcameras/I25Casper/I25Casper.html

Morning thoughts... Today will be partly sunny and quite warm. Temperatures will likely reach the lower and middle 80s across much of the region. Likely high temperatures around the region include: New York City (Central Park): 82° Newark: 84° Philadelphia: 86° Somewhat warmer than normal conditions will likely prevail through much of the week. Cooler air could arrive late in the week. Elsewhere, yesterday saw Casper pick up 2.3" snow. That was that location's earliest measurable snowfall on record. The previous earliest snowfall occurred on September 8, 1962 when 0.3" fell. At Lander, WY, 2.0" snow fell. That surpassed the daily record of 0.3", which was recorded in 1941.

And a timely new paper on this topic: https://essd.copernicus.org/articles/12/2013/2020/essd-12-2013-2020.pdf

Tomorrow will be mostly sunny and somewhat warmer than today. Overall, the first half of September will likely wind up somewhat warmer than normal. The probability of the arrival of an autumn-like air mass near or just after mid-month has increased. On its final day, the historic September heat wave of 2020 brought high temperatures to the Southwest. Select high temperatures included: Blythe, CA: 113° (old record: 112°, 1994) Death Valley, CA: 116° El Centro, CA: 113° (old record: 112°, 1934, 2008, 2011, 2018 and 2019) Flagstaff: 88° Kingman, AZ: 107° (old record: 105°, 1932) Lake Havasu City, AZ: 117° (old record: 114°, 1977, 1986 and 1994) Las Vegas: 106° Needles, CA: 117° (old record: 116°, 1923) Palm Springs, CA: 109° Phoenix: 109° Sacramento: 105° (old record: 103°, 1957) Tucson: 103° Yuma, AZ: 108° An update for the September 1-7 period for Phoenix can be found here: https://www.americanwx.com/bb/topic/53697-phoenix-records-its-hottest-summer-on-record/?do=findComment&comment=5650331 Following the historic heat, record cold will plunge into the Rockies late Monday and Monday night. As the temperature plunges, Denver could pick up only its fourth measurable snowfall on record prior to September 15. Recordkeeping began in 1872. The prior events were: September 3, 1961: 4.2" September 8, 1962: 0.7" September 13, 1993: 5.4" In addition, Denver could see its earliest temperature below 30° during the coming cold shot. The current record is September 14, 2003 when the temperature fell to 29°. The ENSO Region 1+2 anomaly was -1.6°C and the Region 3.4 anomaly was -0.9°C for the week centered around September 2. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.08°C and the ENSO Region 3.4 anomaly has averaged -0.72°C. La Niña conditions are now developing. The SOI was +13.31. Today, the preliminary Arctic Oscillation (AO) figure was +1.079. On September 6, the MJO was in Phase 3 at an amplitude of 0.721 (RMM). The September 5-adjusted amplitude was 0.821. Since 1990, there have been 11 La Niña events, 6 of which followed an El Niño winter. 10/11 (91%) case saw warmer than normal September. All 6 following an El Niño winter were warmer than normal. September mean temperatures for New York City for those cases were: 11 cases: 69.9°; Subset of 6 cases: 70.8°; Entire 1990-2019 period: 69.0°. The September mean temperature for all La Niña and neutral-cool cases following an El Niño winter (1950-2019: n=13) was 69.9°. Overall, the evolution of ENSO, along with the observed ongoing monthly warming (1.6°/decade in NYC and 1.5°/decade in the Northeast Region during September 1990-2019), favors a warmer than normal September. Since 1950, there have been five cases where a La Niña developed during June-July-August or afterward following an El Niño winter. 4/5 (80%) of those cases saw a predominant EPO+/AO+ winter pattern. The most recent such case was 2016-17. 9/10 (90%) of the La Niña winters that followed an El Niño winter featured a predominantly positive EPO. Based on sensitivity analysis applied to the latest guidance, there is an implied 65% probability that New York City will have a warmer than normal September. September will likely finish with a mean temperature near 69.5°.

September 1-7 Update: Phoenix experienced its hottest summer on record. Following that, it experienced one of its warmest first weeks of September on record. With climate change, the intense heat of increasingly hot summers is lingering longer. Summer is now stretching into the opening week of September. September 1-7, 2020 Summary: Average high temperature: 108.9° (tied 2nd highest) Average low temperature: 85.9° (6th highest) Average temperature: 97.4° (tied 2nd highest) Since 1980, the 30-year moving average mean temperature for the first week of September has increased 4.3°. The summer mean temperature has increased a similar 4.0°. Table 1: Average Summer and September 1-7 Temperatures (30-Year Moving Average) September 1-7, 1928 was the first case during which the mean temperature reached 90° (90.0°). By 1995, the mean temperature (30-year moving average) reached 90° for the first time (90.1°). September 1-7, 2006, with a mean temperature of 88.7°, was the last case during which the mean temperature was less than 90° during the first week of September. The first week of September is now as warm as the typical summer was during the 1971-2000 period. Average low temperatures now come to 80° or above. The last time the first week of September saw a weekly mean temperature below 80° was 2009 when the average temperature was 79.6°. The average number of days on which the high temperature reached 100° or above and 105° or above has also increased in recent years. Table 2: September 1-7 Select Data (30-Year Moving Average) Since recordkeeping began in 1895, Phoenix has had 11 cases during which the mean temperature was 95.0° or above during the first week of September. Eight (73%) of those cases occurred during 2000 or later. Six (55%) of those cases occurred during 2010 or later. September 4-6, 2020 was the hottest three-day period on record in September: Mean Temperature: 100.5° (highest on record) Mean High Temperature: 114.0° (highest on record) Mean Low Temperature: 88.7° (2nd highest on record; record: 89.3°, September 5-7, 2019) Table 3: Record High Maximum Temperatures Table 4: Record High Minimum Temperature Just as summer 2020 provided a foretaste of the kind of summers that are expected to become routine by 2050 on account of climate change, the first week of September 2020 offered a glimpse into the future of the staying power of summer's most intense heat under the evolving climate regime.

I agree. Dante’s Divine Comedy would be a great fit. Hopefully, humanity will summon the strength, the courage and the foresight to finally take on the climate change challenge. The siren call of climate change denial must be ignored for that to happen. In many ways, just as society would not tolerate open dumping in reservoirs and rivers, it should adopt a similar stance toward open dumping of greenhouse gases into the atmosphere. Obviously, a transition will be needed, but society has made great technological leaps before when faced with enormous challenges. There’s no reason to believe that isn’t possible today.

From the Yale Climate Connections blog: Like a modern-day Ebenezer Scrooge escorted by the Ghost of Summers Yet to Come, California is catching a glimpse of its future summer weather. The view is a hellish one. Within a two-week span in August, California saw: – the “fire tornado” just north of Lake Tahoe – 130 degrees Fahrenheit heat in Death Valley, which may be the hottest temperature ever reliably recorded on Earth – a largely dry thunderstorm with 11,000 lightning strikes across California over 72 hours, igniting more than 300 wildfires, including two of the three largest ever recorded in the state (and still growing), creating the worst air quality in the world – one million acres burned in California in 2020 with 4 months to go in fire season – tens of thousands of people evacuated from their homes as the fires drew near – rolling power blackouts during a record heat wave – gray, unhealthy air. A blood red sun. Flakes falling from the sky, coating everything below in a layer of white… not snow, but ash. These ghastly scenes all bear links to climate change, and as a result, climate scientists expect them to occur more frequently in the future as global warming continues to raise temperatures and dry the landscape. https://yaleclimateconnections.org/2020/08/climate-change-is-worsening-californias-hellish-wildfires/

Morning thoughts... Today will be mostly sunny and pleasant. Temperatures will likely reach the lower 80s across much of the region. Likely high temperatures around the region include: New York City (Central Park): 81° Newark: 83° Philadelphia: 84° Somewhat warmer than normal conditions will likely prevail through much of next week. Today will be the last day of the historic heat in parts of the Southwest. Record cold is likely tomorrow in the Rockies, along with accumulating snow.

In its coverage of the extreme heat, the Los Angeles Times had a fairly lengthy discussion of climate change. https://www.latimes.com/california/story/2020-09-05/heat-health-risks This linkage to climate change provides important context for the newspaper’s readers and the general public. The Washington Post also provide climate change-related context when discussing California’s fires and extreme heat. The New York Times did not, depriving its readers of important insight into the events.

California’s biggest wildfires:

2020 was the 11th summer on record with a mean temperature above 94.5 degrees in Phoenix. It also became the 6th out of those 11 summers to see the 9/1-6 period wind up warmer than the entire summer average. All of those six summers with a warmer start to September occurred 2000 or later and four occurred 2010 or later. What this means is that the intense heat of exceptionally warm summers now has a tendency to last a little longer than had been the case in the past.

Temperatures rose into the lower 80s across much of the region today. A similar day is in store for tomorrow. Overall, the first half of September will likely wind up somewhat warmer than normal. The probability of the arrival of an autumn-like air mass after mid-month has increased. The historic September heat wave of 2020 brought more searing temperatures to the Southwest. The extreme heat will break will break after tomorrow. Select high temperatures included: Blythe, CA: 118° (old record: 114°, 1955) Burbank, CA: 114° (old record: 111°, 1955) ***Tied September and all-time record*** Death Valley, CA: 123° (old record: 118°, 1955 and 2006) Denver: 97° (tied record set in 2013) El Centro, CA: 118° (old record: 114°, 1934) Flagstaff: 91° (old record: 87°, 1977) Kingman, AZ: 110° (old record: 104°, 1930, 1932 and 1955) ***New September record*** Lake Havasu City, AZ: 118° (old record: 113°, 1977, 1986 and 2012) ***Tied September record*** Las Vegas: 114° (old record: 110°, 1955) ***New September record*** Needles, CA: 120° (old record: 114°, 1924) ***Tied September record*** Palm Springs, CA: 120° (old record: 114°, 1923, 1957 and 1986) Phoenix: 113° (old record: 111°, 1986 and 2013) Pueblo, CO: 103° (old record: 100°, 1933) ***New September record*** Reno: 95° Tucson: 107° (old record: 106°, 1952) Yuma, AZ: 115° (old record: 113°, 1986) Death Valley recorded its 3rd consecutive day with high temperatures of 120° or above. That ties the September record, which was set during September 1-3, 1950 and tied during September 2-4, 2007. In addition, it ties the record for the most such days in September, which was set in 1950 and 2007. Palm Springs recorded its second consecutive day with a high temperature of 120° or above for the first time on record in September. Phoenix recorded its 3rd consecutive day with a high temperature of 113° or above. That is the longest such stretch in September. Following the historic heat, record cold will plunge into the Rockies late Monday and Monday night. As the temperature plunges, Denver could pick up only its fourth measurable snowfall on record prior to September 15. Recordkeeping began in 1872. The prior events were: September 3, 1961: 4.2" September 8, 1962: 0.7" September 13, 1993: 5.4" In addition, Denver could see its earliest temperature below 30° during the coming cold shot. The current record is September 14, 2003 when the temperature fell to 29°. The ENSO Region 1+2 anomaly was -0.6°C and the Region 3.4 anomaly was -0.7°C for the week centered around August 26. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.02°C and the ENSO Region 3.4 anomaly has averaged -0.63°C. Neutral-cool conditions will likely evolve into La Niña conditions during the fall. The SOI was +12.18. Today, the preliminary Arctic Oscillation (AO) figure was +0.514. On September 5, the MJO was in Phase 4 at an amplitude of 0.819 (RMM). The September 4-adjusted amplitude was 1.015. Since 1990, there have been 11 La Niña events, 6 of which followed an El Niño winter. 10/11 (91%) case saw warmer than normal September. All 6 following an El Niño winter were warmer than normal. September mean temperatures for New York City for those cases were: 11 cases: 69.9°; Subset of 6 cases: 70.8°; Entire 1990-2019 period: 69.0°. The September mean temperature for all La Niña and neutral-cool cases following an El Niño winter (1950-2019: n=13) was 69.9°. Overall, the evolution of ENSO, along with the observed ongoing monthly warming (1.6°/decade in NYC and 1.5°/decade in the Northeast Region during September 1990-2019), favors a warmer than normal September. Since 1950, there have been five cases where a La Niña developed during June-July-August or afterward following an El Niño winter. 4/5 (80%) of those cases saw a predominant EPO+/AO+ winter pattern. The most recent such case was 2016-17. 9/10 (90%) of the La Niña winters that followed an El Niño winter featured a predominantly positive EPO. Finally,on September 5, Arctic sea ice extent data was not available. On September 2, Arctic sea ice extent was 3.861 million square kilometers (JAXA). Based on the August 31 figure, minimum Arctic sea ice extent will most likely finish somewhere from 3.645 million to 3.695 million square kilometers in September. The highest 25% bound is 3.742 million square kilometers. The lowest 25% bound is 3.581 million square kilometers. 2020 is the second consecutive year with a minimum extent figure below 4.000 million square kilometers and the third such year on record.

It’s not hubris. It’s a conclusion based on the evidence. Here’s one study that shows historical temperature trends, the trends that would have occurred only with natural forcings, and those that would have occurred only with anthropogenic forcings. The relevant charts are on page 8 of the paper. https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1002/jgrd.50239

When greenhouse gases are omitted, the observed ongoing warming cannot be replicated. Only when such gases are included can the observed warming be replicated. Gavin Schmidt, director of National Aeronautics and Space Administration’s Goddard Institute for Space Studies, said that scientists look at a lot of different things at once. “We have a very, very clear understanding that the amount of heat in the ocean is increasing—the ocean heat content is going up by a lot,” said Schmidt. “That implies that there must be an external change in the radiation budget of the earth—more energy has to be going in than leaving... To understand this rapid change in climate, scientists look at data sets and climate models to try to reproduce the changes that have already been observed. When scientists input only natural phenomena such as the sun’s intensity, changes in the Earth’s orbit and ocean circulation, the models cannot reproduce the changes that have occurred so far. “We have independent evidence that says when you put in greenhouse gases, you get the changes that we see,” said Schmidt. “If you don’t put in greenhouse gases, you don’t. And if you put in all the other things people think about—the changes in the earth’s orbit, the ocean circulation changes, El Niño, land use changes, air pollution, smog, ozone depletion—all of those things, none of them actually produce the changes that we see in multiple data sets across multiple areas of the system, all of which have been independently replicated.” In other words, only when the emissions from human activity are included, are the models and data sets able to accurately reproduce the warming in the ocean and the atmosphere that is occurring. https://blogs.ei.columbia.edu/2017/04/04/how-we-know-climate-change-is-not-natural/

In its coverage of the ongoing severe wildfires in California, The Washington Post provided a linkage to climate change: The article noted: Studies show human-caused climate change is tilting the odds in favor of more frequent, severe and longer lasting heat waves, as well as larger wildfires throughout large parts of the West. Research published last month, for example, shows climate change is tied to more frequent occurrences of extreme-fire-risk days in parts of California during the fall (meteorologists define the fall as beginning on Sept. 1). https://www.washingtonpost.com/weather/2020/09/06/california-wildfires-heat-wave/

There is literature about the lags namely where increasing solar insolation kicked off warming in the Northern Hemisphere and subsequent warming led to increases in CO2, which, in turn, amplified further warming. That humanity has engineered a “short cut” of sorts by dramatically and rapidly increasing atmospheric CO2 does not mean that (1) this increased CO2 won’t drive warming (CO2's properties found in physics and other empirical literature suggests that it should; the ongoing observed warming demonstrates that the expected warming is taking place) and (2) that one assumes the climate system is linear. No serious climate scientist has made such claims that I can find. The real question is why atmospheric CO2 levels consistent with the Pliocene should not produce warming perhaps of a similar magnitude? Global temperature are rising. The 2010s was the warmest decade of the instrument record (all major data sets). The 2020s will likely exceed that level of warmth.

A basic primer in slides by Paleoclimatologist Jessica Tierney: https://www.agci.org/sites/default/files/pdfs/lib/main/19s1_05_08_1800_Tierney_WOR_Aspen2019.pdf Dr. Tierney has done extensive research on earlier climate regimes e.g., the Eocene warming. She is the co-author of newly published paper on temperatures during the last ice age.