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The Honest Broker Profile picture
@RogerPielkeJr
Sep 2, 2021 • 12 tweets • 5 min read • Read on X
Scrolly
Remarkable detail about NYC infrastructure:
Sewer system designed to accommodate a 5-year storm, one with a 20% chance of occurring in any year

Like the Texas freeze, events are exposing poor infrastructure & limited capacity to deal with rare events

www1.nyc.gov/assets/em/down… Image
Flooding in NYC is highly correlated with sewer infrastructure (look at Queens)
mdpi.com/2073-4441/9/10… Image
Honestly, if I am a NY politician, given these facts, all I'd be talking about is climate change
No one in NYC gov't should be surprised by flooding

Hamidi et al 2018. Uncertainty analysis of urban sewer system using spatial simulation of radar rainfall fields: New York City case study. SERRA 32:2293-2308.
link.springer.com/article/10.100… Image
NY and NJ are hotspots for inland flooding from tropical cyclones

Villarini et al 2014. North Atlantic tropical cyclones and US flooding. BAMS 95:1381-1388.
journals.ametsoc.org/view/journals/… Image
NYC days with rainfall >4in 1900 to 2010
A >4in rainfall in one day was a 1 in ~3 year event in NYC
New York City Panel on Climate Change 2010 Report
nyaspubs.onlinelibrary.wiley.com/doi/full/10.11… Image
"Extreme rainfall measured at Central Park has
significant year-to-year variation such that no statistically significant trends in extreme rainfall can be
identified (Horton et al., 2015)"
New York City Panel on Climate Change 2019 Report
researchgate.net/profile/Jorge-…
The effects of climate change on extreme precip were said to be not detectable in the 2020s, in NYC Panel on Climate Change 2019 Report

So if this week's floods show clear fingerprints of climate change, then the mayor of New York is right to say that this event was unexpected Image
Interestingly the current NYC Storm Water Resiliency Plan discusses plans for an extreme rainfall event of 3.5 inches falling in 1 hour 9this week say 3.15 in one hour), which it defines with a return period of 100 yrs
www1.nyc.gov/assets/orr/pdf… Image
So there are mixed messages here

A. This week's storm was the result of climate change - in which case policy makers were not warned

B. This week's storm was a ~100-yr flood indistinguishable from natural variability, in which case policy makers were unprepared

Pick one
For politicians, there's obvious incentives to pick A

For activist scientists trying to sell the NYC flood as a reason for broader emissions policy, a collateral effect is to provide cover for politicians who dropped the ball in local NYC flood/stormwater policy & infrastructure
Why NYC Is Still So Unprepared For Flash Floods wnyc.org/story/why-nyc-… via @WNYC

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More from @RogerPielkeJr

The Honest Broker Profile picture
Jan 11
🧵
The percentage of a percentage trick is increasingly common & leads to massive confusion

Here a undetectable difference of 0.01 events per year per decade is presented as the difference between a 31% and 66.4% increase (in the *likelihood* of the event, not the event itself) Image
The resulting confusion is perfectly predictable

Here is a reporter (NPR) explaining completely incorrectly:
"The phenomenon has grown up to 66% since the mid-20th century"

False Image
Also, the numbers in the text and figure do not appear to match up
I asked Swain about this over at BlooSkeye Image
Read 4 tweets
The Honest Broker Profile picture
Dec 22, 2024
The new hurricane damage time series trick

Step 1: create Frankenstein dataset w/ an increasing trend where there was not an increasing trend before

Step 2: Attribute the increasing trend to climate change

Step 3: Use Frankenstein dataset to impeach other research w/ no trend Image
The reason that the blue and red numbers are different is that they are different measures of hurricane losses

E.g., the red numbers include inland NFIP damage
The blue numbers do not, on purpose, because NFIP only started in 1968

They are apples and oranges
Now 3 peer-reviewed papers (PNAS, JAMC, BAMS) make this most basic of errors by replacing and splicing NOAA BDD to the MWR/NHC time series

Predictably all three papers find an increasing trend in normalized hurricane damage even though landfalling hurricanes are not increasing Image
Read 6 tweets
The Honest Broker Profile picture
Dec 21, 2024
A Frankenstein dataset results from splicing together two time series found online

Below is an example for US hurricane damage 1900-2017
Data for 1980-2017 was replaced with a different time series in the green box
Upwards trend results (red ---)

Claim: Due to climate change! Image
The errors here are so obvious and consequential that it is baffling that the community does not quickly correct course

Read about it here
Is my analysis flawed?
osf.io/preprints/osf/…
The IPCC AR6 cited a paper misusing the Frankenstein hurricane loss dataset to suggest that NOAA's gold standard hurricane "best track" dataset may be flawed

JFC - Using flawed economic loss data to suggest that direct measurements of hurricanes are in error! Image
Read 6 tweets
The Honest Broker Profile picture
Nov 2, 2024
We’ve reached the point where an IPCC author is openly rejecting the conclusions of the IPCC out of concern over how their political opposition is correctly interpreting the AR6

The integrity of the IPCC on extreme events is now under attack
The IPCC explains that a trend in a particular variable is DETECTED if it is outside internal variability and judged with >90% likelihood

For most (not all) metrics of extreme weather detection has not been achieved

That’s not me saying that, but IPCC AR6 Image
The IPCC also assesses that for most (but not all) metrics of extreme weather the signal of a change in climate will not emerge from internal variability with high confidence (ie, >90%) by 2050 or 2100, even assuming the most extreme changes under RCP8.5 Image
Read 6 tweets
The Honest Broker Profile picture
Oct 31, 2024
🧵
You won't believe this

The US National Academy of Sciences has a new study committee on Extreme Event Attribution

Among its sponsors are the Bezos Earth Fund and Robert Litterman

Who are they? . . . Image
Image
The Bezos Earth Fund sponsors World Weather Attribution, an advocacy group promoting the connection of weather events w/ fossil fuels in support of press coverage & lawsuits

Robert Litterman is on the board of Climate Central which founded WWA & collaborates on climate advocacy Image
The fact that a NAS committee is funded by political advocates is crazy enough

But that is not all

On the committee itself are individuals from two climate advocacy groups

One . . . the Union of Concerned Scientists which is working to use attribution to support lawsuits . . . Image
Read 7 tweets
The Honest Broker Profile picture
Jul 18, 2024
1/3
Climate science is broken

I provided PNAS with irrefutable evidence that a paper it published used a fatally flawed “dataset” compiled by interns for corporate marketing

I asked for a retraction

PNAS investigated & found no problems at all with the dataset

The PNAS reply belowImage
Image
I documented how the “dataset” was created (including contributions of two of my former students)

It was never intended for scientific research, just for selling insurance products

In the next Tweet I’ll link to my post with all of the details

If climate science cannot pass this simple test, it has a serious problemImage
Full analysis

rogerpielkejr.substack.com/p/apples-orang…
Read 4 tweets

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