From Newsgroup: uk.sci.weather

Data downloaded 15 Sep 2026 from https://www.metoffice.gov.uk/hadobs/hadsst4/data/download.html
selecting
HadSST.4.0.1.0_monthly_GLOBE.csv

SST anomaly wrt the 1961 to 1990 average.
Using 284 datapoints from 2003.0 to Aug 2026 to avoid the 10 year
recovery period of geodata, post Mt Pinatubo eruption.
Using offline javascript curvefitter at statpages.info
and curve types linear (no acceleration), exponential (increasing acceleration), quadratic (constant acceleration), indicial (falling acceleration)
For data to Aug 2026.
Best fit quadratic and 6 figures retained for anyone else
repeating/checking this processing
y= 0.420144 -0.005086*x + 0.000946*x*x
where y is Hadley SST anomaly in deg C and x is year minus 2000

data output in sep 2026
2050, 2.531
2100, 9.372

aug 2026
2050, 2.483
2100, 9.105

july 2026
2050, 2.457
2100, 8.960

Processing discontinued during La nina phase of ENSO and falling global SST

July 2025 data, output Sep 2025
Projected to 2050, +2.718 deg C
Projected to 2100, +10.463 deg C

For the month on month difference for 2100 projection, from Jun/Jul
2023, +0.67 degC, +0.86, +0.88, +1.60, +0.34, +0.20, +0.33 , +0.19,
+0.11, +0.26, +0.31, -0.20, +0.24, +0.20 , +0.12, +0.02 degC, (missing), -0.20, -0.16, -0.52 (most recent after 4 month gap).

Feb 2025 data, output Mar 2025
Projected to 2050, +2.814
Projected to 2100, +10.983

Jan 2025 data, output Feb 2025
Projected to 2050, +2.852 deg C
Projected to 2100, +11.140 deg C

Dec 2024 data, output Jan 2025
Projected to 2050, +2.888 deg C
Projected to 2100, +11.335 deg C

Dec 2024 month of output not processed

Oct 2024 data, output Nov 2024
Projected to 2050, +2.884 deg C
Projected to 2100, +11.312 deg C
For the month on month difference for 2100 projection, from Jun/Jul
2023, +0.67 degC, +0.86, +0.88, +1.60, +0.34, +0.20, +0.33 , +0.19,
+0.11, +0.26, +0.31, -0.20, +0.24, +0.20 , +0.12, +0.02 degC (most recent).

Sep 2024 data, output Oct 2024
Projected to 2050, +2.880 deg C
Projected to 2100, +11.289 deg C

Aug 2024 data, output Sep 2024
Projected to 2050, +2.857 deg C
Projected to 2100, +11.165 deg C

Jul 2024 data, output Aug 2024
Projected to 2050, +2.819 deg C
Projected to 2100, +10.963 deg C

Jun 2024 data, output Jul 2024
Projected to 2050, +2.775 deg C
Projected to 2100, +10.721 deg C

May 2024 data, output Jun 2024
Projected to 2050, +2.809 deg C
Projected to 2100, +10.919 deg C


April 2024 data, output May 2024
Projected to 2050, +2.755 deg C
Projected to 2100, +10.612 deg C

Mar 2024 data, output April 2024 (delayed to early May)
Projected to 2050, +2.706 deg C
Projected to 2100, +10.354 deg C

For Feb 2024 data, output Mar 2024
Projected to 2050, +2.881 deg C
Projected to 2100, +10.245 deg C

Projected to 2050, +2.650 deg C
Jan 2024 data projected to 2100, +10.051 deg C

Projected to 2050, +2.588 deg C
Dec data projected to 2100, +9.722 deg C

For data to Nov 2023
Projected to 2050, +2.550 deg C
Nov o/p projected to 2100, +9.518 deg C
--
Global sea level rise to 2100 from curve-fitted existing altimetry data <http://diverse.4mg.com/slr.htm>
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From Newsgroup: uk.sci.weather

On 9/15/26 6:50 AM, N_Cook wrote:

Best fit quadratic-a and 6 figures

As human-induced greenhouse gases rise, global-averaged upper-level atmospheric water vapour and thin cirrus should be expected to decrease
not increase.

Water vapour and cirrus cloudiness should be thought of as a negative
rather than a positive feedback to human-induced - or anthropogenic
greenhouse gas increases.

No significant human-induced greenhouse gas warming can occur with such
a negative feedback loop.
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From Newsgroup: uk.sci.weather

|On 9/15/26 6:50 AM, N_Cook wrote:

Best fit quadratic?? and 6 figures

|As human-induced greenhouse gases rise, global-averaged upper-level |atmospheric water vapour and thin cirrus should be expected to decrease
|not increase.
|Water vapour and cirrus cloudiness should be thought of as a negative
|rather than a positive feedback to human-induced - or anthropogenic |greenhouse gas increases.
|No significant human-induced greenhouse gas warming can occur with such
|a negative feedback loop.

It cain bee happnin!!!

Put a mike next to a speaker and the +ve feedback easily overcomes
the negative feedback built into the amp circuits.

If negative feedback keeps a system near its operating point
it doesnt have to do much work.

But +ve feedback grows stronger the further you are from the
operating point and at SOME point it will overpower the usual
ways the system stays in equilibrium.

Even the dopes that insisted "it cain happin" 1/2 the time
admitted the distant past was warmer than the present and
sometimes got flummixed at conferences when that was point out.
How could that happen if feedback was perfect?
I think the last of them must have died from embarrassment 30 years ago.

As to what is happening:

<https://www.woodfortrees.org/plot/esrl-co2/from:1998/mean:20/normalise/plot/gistemp/from:1998/mean:20/normalise/>

You raise CO2 from 280 to 430 in 150y and the global temperature goes
up just like going back in time to the last time atm CO2 was
that high -- 110 million years ago(*).
--
(*) Atm CO2:
Atmospheric carbon dioxide levels for the last 500 million years
Daniel H. Rothman
PNAS April 2, 2002 99 (7) 4167-4171; https://doi.org/10.1073/pnas.022055499
Fig 4.

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From Newsgroup: uk.sci.weather

On 15/09/2026 18:30, R Kym Horsell wrote:

You raise CO2 from 280 to 430 in 150y and the global temperature goes
up just like going back in time to the last time atm CO2 was
that high -- 110 million years ago(*).

I have to admire Svante Erhenius. He got it near enough spot on from laboratory experiment , the graph of atmospheric CO2 content versus "greenhouse" effect heating. Over a gundred years ago and not a computer
in sight.
--
Global sea level rise to 2100 from curve-fitted existing altimetry data <http://diverse.4mg.com/slr.htm>
--- Synchronet 3.22a-Linux NewsLink 1.2