The heat wave assessment in that report shows the 1930s as having the most heat waves in the US was done by these scientists in the 4th US NCA https://science2017.globalchange.gov/chapter/6/ pic.twitter.com/y6WWHrtcKN
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This is a pretty eye-opening thread
Consensus science of the US NCA & IPCC are authoritative and legitimate*
*Except when @BjornLomborg cites them
When that happens please use Twitter mob science instead 
https://twitter.com/BjornLomborg/status/1429479685134725124 …
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In turn, the assessment of the US NCA relied on an expert workshop that produced a peer reviewed paper which concluded: "the highest number of heat waves occurred in the 1930s, with the fewest in the 1960s" https://doi.org/10.1175/BAMS-D-12-00066.1 …pic.twitter.com/usyWvQEBrL
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Hilarious: The Twitter mob turning on the heat wave data have discovered that the original sin can be traced to one of my papers (based on work of my co-author Ken Kunkel, heat wave expert at NOAA & US NCA author) https://twitter.com/ClimateOfGavin/status/1429196857809514496?s=20 … Our paper: https://doi.org/10.1175/1520-0477(1999)080%3C1077:TFIWAC%3E2.0.CO;2 …
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So let's put a pin in this When NCA5 comes out let's check back see if Ken Kunkel remains an NCA contributor and if the hot 1930s disappear in the next NCA
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And let me say, Twitter science or not The longstanding evidence that the 1930 were exceptionally hot in the US will be difficult to erase eg, https://link.springer.com/article/10.1007%2Fs10584-012-0659-2 …pic.twitter.com/Lx1xSiT0Kz
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That said, there are a lot of ways to define a "heat wave" so surely one of these will give the right answer
pic.twitter.com/V4KrezIvF1
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My advice? The easiest way to address the off-message 1930 heat waves would be to start the analysis in 1950 like the IPCC AR6pic.twitter.com/i7tmXHE7a2
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Down the rabbit hole I go... Prof Andrew Dessler takes aim at our paper that first used the heat wave index adopted by the US NCA & the EPA He asks: Why this definition of a heat wave? It's a fair question And it is clearly answered in our paper that he links to...pic.twitter.com/UnmkMhxQ0q
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We explain clearly that a "heat wave" as used in our paper is based on research showing that this definition is associated with increased mortality It is thus a metric of a heat wave that indicates indicates societal impact & not at all arbitrary https://doi.org/10.1175/1520-0477(1999)080%3C1077:TFIWAC%3E2.0.CO;2 …pic.twitter.com/rbmvBai5Vz
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A very funny side note I've long known that my old collaborator Ken Kunkel helped write the US NCA But until today I was unaware that our paper's methods (L) are the basis for the USNCA heat wave index (R) which I've shared many times That's gotta make the Twitter mob insane
pic.twitter.com/Ra7wpvuiFU
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Our 1999 paper (which remains one of my most cited) quantified trends in weather and climate extremes that cause economic and human impacts https://doi.org/10.1175/1520-0477(1999)080%3C1077:TFIWAC%3E2.0.CO;2 … It was a fun paper, not least because I got to collaborate w/ the legendary Stan Changnonpic.twitter.com/WSgtSw8ubR
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