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Simon Lee @simonleewx.com · 18h

Very much so, thanks Simon!

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Simon Lee @simonleewx.com · 21h

Even sunny St Andrews isn't immune from the anticyclonic gloom today ☁️

Grey clouds over a still sea with some small waves breaking onto the beach

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Reposted by Simon Lee

Kelsey Malloy @kmalloy.bsky.social · 1d

An atmospheric general circulation model you can run on a Python Jupyter notebook?! Heck yeah! Check out this project- both an educational tool for undergraduates/graduate students, and a research tool for scientists interested in idealized climate modeling.
journals.ametsoc.org/view/journal...

journals.ametsoc.org

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Simon Lee @simonleewx.com · 1d

Article is based on www.metoffice.gov.uk/binaries/con...

www.metoffice.gov.uk

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Reposted by Simon Lee

St Andrews Earth & Environmental Sciences @earthscista.bsky.social · 1d

Our first years headed out on their first field trip to Ruddons Point on the Fife coast this weekend – diving into Quaternary landscape evolution & sea level changes! Plenty of sunshine on the Saturday trips, but Sunday morning brought the haar (and not just the 'haar haar' response to staff jokes)

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Simon Lee @simonleewx.com · 1d

This particular reporter usually does a good job, I’ve found!

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Simon Lee @simonleewx.com · 2d

I'm teaching teleconnections & atmospheric/oceanic variability (+ a soupçon of sub/seasonal forecasting) to our Junior Honours students at the moment, so it's perfect timing to also be quoted here on forecasts for the coming season (article better than headline!) www.dailymail.co.uk/news/article...

Met Office gives first winter outlook as experts explain Polar Vortex

The Polar Vortex is a large circulation of winds 30 miles above ground level in the stratosphere, and can impact winter weather by strengthening or weakening.

www.dailymail.co.uk

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Simon Lee @simonleewx.com · 3d

Past instalments in the Global and Regional Climate series, going back to 1995, can be found here: rmets.onlinelibrary.wiley.com/doi/toc/10.1...

An ongoing log of our changing climate.

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Simon Lee @simonleewx.com · 3d

Global and regional climate in 2024 🌡️📈

The latest annual assessment from the Hadley Centre @metoffice.gov.uk published in @rmets.org Weather

Free to read: doi.org/10.1002/wea....

Screenshot of the Weather article page "Global and regional climate in 2024" led by Caroline Sandford

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Simon Lee @simonleewx.com · 5d

Interesting – looks like a large disturbance from the bottom up (see U-wind time series here: ozonewatch.gsfc.nasa.gov/meteorology/...). Haven't been following too closely but perhaps barotropic anomalies from some large blocking anticyclones over Eurasia. A bit early to be too significant, though.

NASA Ozone Watch: 2025 Arctic MERRA-2 Wind

2025 Arctic MERRA-2 Wind

ozonewatch.gsfc.nasa.gov

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Simon Lee @simonleewx.com · 7d

Aye I only spotted it last night when I revisited the chart for Floris!

Simon Lee @simonleewx.com · 7d

Storm Floris at 12 UTC 4 August 2025 vs. Storm Amy at 18 UTC 3 October 2025.

Strikingly similar synoptic patterns and locations of the two storms separated by only two months!

Storm Floris surface pressure and fronts from the Met Office

Storm Amy surface pressure and fronts from the Met Office

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Simon Lee @simonleewx.com · 7d

Excellent! Glad to hear it's still going.

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Simon Lee @simonleewx.com · 7d

Ah, I loved that view during my time at UoR! Hope you are enjoying your time there.

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Simon Lee @simonleewx.com · 8d

Reminded me of this rmets.onlinelibrary.wiley.com/doi/10.1002/...

The gust that never was: a meteorological instrumentation mystery

Time series of 10-m wind speeds (maximum gust and minimum lull, units ms−1) at the University of Reading Atmospheric Observatory (51.441°N, 0.938°W, altitude 66m above MSL) for each minute 0000–2359 ...

rmets.onlinelibrary.wiley.com

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Reposted by Simon Lee

Zeke Hausfather @hausfath.bsky.social · 8d

And here is the percentage of the world's land area setting a new all-time monthly maximum temperature record in each decade:

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Simon Lee @simonleewx.com · 9d

The west–east temperature contrast across North America is a hallmark of the Pacific Ridge regime, which is currently at 1.5–2 standard deviations simonleewx.com/ecmwf_north_...

Weather Regime Index plots from the ECMWF IFS subseasonal ensemble

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Simon Lee @simonleewx.com · 9d

Amy is a separate low pressure system, hence the new name. It did spawn from Humberto but the closed low is considered different.

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Simon Lee @simonleewx.com · 10d

Wonder what NH mean alone will look like?

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Simon Lee @simonleewx.com · 10d

This is absolutely staggering.

Zack Labe @zacklabe.com · 10d

Record warm ocean temperatures continued in September across the North Pacific Ocean, with a number of consequential impacts (including on downstream weather patterns).

This graph shows the average for a band across the midlatitudes for every September from 1854-2025 using @noaa.gov ERSSTv5 data.

Green line graph time series of average sea surface temperature anomalies for each September from 1850 through 2025 for only the midlatitude region of the North Pacific Ocean. There is large interannual variability, but an overall long-term increasing trend. Anomalies are computed relative to a 1981-2010 baseline. 2025 is a record high.

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Simon Lee @simonleewx.com · 10d

Beaufort Force 12 (73mph or greater) is “hurricane force”, and that is referred to in storms in the UK where appropriate. But there is a VERY big difference between hurricane force winds and an actual hurricane.

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Simon Lee @simonleewx.com · 10d

Please provide evidence to support your claims.

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Simon Lee @simonleewx.com · 10d

“Hurricanes” are tropical cyclones, which feed off the energy of high oceanic heat. They are an entirely different type of storm which do not reach our shores. The storms we experience, like Amy, feed off the temperature contrast between cold and warm air masses.

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Reposted by Simon Lee

Eddy Graham ("eddy weather") @eddywx.bsky.social · 10d

#StormAmy boomerang loop of #Meteosat12 #MTG water vapour 6.2micron channel imagery over 36h (3-4 Oct 2025) shows extent & expansion of deep dry air intrusion, before being spun majestically around the record-breaking deep cyclone centre #VorticityInAction

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Simon Lee @simonleewx.com · 10d

Yes, Amy spawned off Humberto at the end of its life — in fact, for a while, it looked like the storm hitting the UK would be ex-Humberto until it became clearer that it was a separate circulation.

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