Dr Joanne Williams
@jowilliams.bsky.social
4K followers 880 following 7.6K posts
Sea-level and tidal scientist. Liverpool, UK. Opinions own!
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jowilliams.bsky.social
Hooray, an @xkcd.com about tides! Although only little ones, round here we can get a tidal range of 10 *metres* .

xkcd.com/3135/
    [Single frame, with Megan and Cueball standing at a coastline with grass, with water and waves visible. They are looking at the ocean and are standing together.]

    Cueball: Hey, where's that big island we were looking at this morning?
    Megan: Oh, it's underwater. The ocean's depth here goes up and down by like ten feet every day.
    Cueball: What?
    Megan: It's because the planet has a big moon orbiting near the surface. It causes weird gravity effects.
    Cueball: What???

    [Caption below the frame:]
    People here are used to them, but tides are one of the weirdest and most sci-fi elements of life on Earth.

Transcript thanks to explainxkcd
jowilliams.bsky.social
I want to hear it from all sorts of media now. I want lessons from the countries that had near misses with fascists, and the people who made peace treaties work. We know what happens when it gets out of control. How do we *stop* it?
jowilliams.bsky.social
Do, it's fantastic. I couldn't manage it all in one go, too emotional. Rammed full of memories.
jowilliams.bsky.social
The word, the fog-laden bustling streets of words, ringing with the cries of market sellers and ... well I'm no Dickens 😆
jowilliams.bsky.social
Wasn't Dickens mostly published this way too? All those cliffhanger chapter endings.
jowilliams.bsky.social
I wish they'd shift immigration into a different department. Imagine what a different attitude would be brought by a ministry primarily concerned with Business, Education or Culture. Suddenly the story would be all about the benefits of immigration and how to make visa smoother.
Reposted by Dr Joanne Williams
noc.ac.uk
🔔 Deadline extension! 🔔

UK primary school teachers, we'd love to hear from you.

Your response will help us understand the current 'sea'scape, so that we can transform who becomes a marine scientist within a generation! 🌊 🌈 📚

⏳Plus, it's a quick survey! Spread the word - survey closes 21 Oct.
noc.ac.uk
We want to hear from primary school teachers in the UK!

Help us make marine science more diverse & inclusive by sharing your insights in our survey about how the ocean features in your teaching. 🌊🔍🌈

plymouthlab.qualtrics.com/jfe/form/SV_...

Please RT & share! 📩 🔃

#education #DiversityInSTEM
Crowd of seven primary-aged children huddle around a microscope, led by an early-career female marine researcher, on board laboratory on research ship RRS Discovery.
jowilliams.bsky.social
Were they ever painted? The oak would have been whiter before 4 centuries of dust and lamp smoke.
jowilliams.bsky.social
Tolkien trying to remember how he was planning on getting frodo and sam back from mount Doom.
jowilliams.bsky.social
's funny how you remember people you met once at these classes though. Somewhere out there is a kid with a Christmas birthday, whose horticultural mum was primarily concerned about her timing being too close to sprout season!
jowilliams.bsky.social
It's probably bad form for accompanying partners to stay behind for wine after antenatal classes whilst birthing partners glare at the logo of the crossed out bulging woman on the bottle.
jowilliams.bsky.social
As usual, I focus on "still" water level, which averages out the effect of waves. It's the level you might get inside a really sheltered harbour.
On an exposed coast, you'll also get waves on top of that, reaching higher and further inshore due to the raised baseline.
www.bbc.co.uk/news/article...
Pictures show effect of Storm Amy at Norfolk and Suffolk coast
The Environment Agency says flooding to businesses and homes is likely in some areas.
www.bbc.co.uk
jowilliams.bsky.social
You can see these plots and other tide gauge locations at NTSLF.org , or if you want quality controlled data for analysis it can be downloaded from BODC.ac.uk .
National Tidal and Sea Level Facility | National Tidal and Sea Level Facility
NTSLF.org
jowilliams.bsky.social
We need to do some validation of the data (comparing adjacent instruments, looking for recording errors etc) before we can confirm this, but the total at Lowestoft was within a few cm of the highest level recorded in 2024.
jowilliams.bsky.social
At Lowestoft, #Amy brought the surge a little later, on the 4th and 5th of October. Still a skew surge of just over 1 metre. But there's less difference between neap and spring tides, so the levels were much higher than the usual range expected before weather effects.

bsky.app/profile/jowi...
Tide gauge data at Lowestoft, showing a predicted (without weather) tide ranging from 1-2m to 0.5 - 2.5m. But observations rose to about 3.5m twice, on the 4th and 5th of October.
jowilliams.bsky.social
At Liverpool, #Amy raised the high tide, with a skew surge of around 1 metre on 3rd October 2025. But Liverpool in October has a huge range between neap and spring, so despite the calm weather today the tides were even higher! So the total won't be unusual there.
bsky.app/profile/jowi...
A week of predicted (without weather) and observed tide gauge data at Liverpool, with a tidal range of 4-7m on the 1st October and about 2-10m on the 6th October 2025.
jowilliams.bsky.social
Now Storm #Amy has passed, let's take a look at how big the storm surge was, and how much the low pressure and wind raised the high tides.
This is based on unchecked observations at the moment, the QC step happens monthly, but we can get a sneak preview.
jowilliams.bsky.social
Storm #Amy is expected to bring storm surges to the south east on the night of Oct 4th-5th, raising the high tide by around 1 metre. Fortunately it is not spring tides yet, but in areas with a smaller tidal range we can expect high total levels.
ntslf.org/files/ntslf_...
Ensemble of surge forecasts for Oct 2nd - 8th 2025. Storm surge starting north west England and Scotland on the 4th, then going down the east coast. This is surge residual so the peak (nearly 2m) will not coincide with the highest tide. Small triangles indicate the time of high tide at each site. Spring tides are a couple of days after full moon, which is not till the 7th.
Reposted by Dr Joanne Williams
egu-os.bsky.social
We're thrilled to announce that the #EGU Ocean Sciences Division is now on Bluesky and LinkedIn!🎉 Follow us for the latest updates and many blog posts about the world of ocean science. 🌊🧪

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jowilliams.bsky.social
Bottom middle is very 1970s Doctor Who.
jowilliams.bsky.social
Probably better than whatever they've buried behind 49 words of clickbait
jowilliams.bsky.social
How apt! (Fwiw I have sympathy with overzealous auto modding, getting this right is Difficult.)
jowilliams.bsky.social
Coates i don't know what racey doc you've posted but the automod service has decided it's too adult content for my delicate unverified sensibilities!
Reposted by Dr Joanne Williams
ncdominie.bsky.social
My dad has turned up this photo from a visit "many years ago" to the Forth Bridge. I think it's taken from what he calls the howff, just below track level, used by the maintenance workers.

I guess when you're engaged in a proverbially endless task, you need a wee cup of tea once in a while.
Black and white photo showing a kettle on the sill of a very dirty window. Immediately outside the window is the very recognisable steelwork of the Forth Bridge.