Charles Powell

PDRA in Atmospheric & Oceanic Fluid Dynamics @ DAMTP, University of Cambridge

[Charles Powell @Charles_p29]

A convective cell in the distance. Very noticeable difference in flow at low and high levels

[Charles Powell @Charles_p29]

@GNRailUK What’s the likelihood the final train to Cambridge from KGX at 23:12 still runs?

[Charles Powell @Charles_p29]

@WeatherProf Which seasonal models signalled recurve (presumably forecasting steering flows)? Could you like to any papers/blogs/tweets discussing this please?

[PooleDorsetWeather @pooleweatheruk]

Rare wave clouds observed south of the convergence zone.
@GunnerMatt91 @Winchester21107

[Met4Cast - UK Weather @Met4CastUK]

With the on going chaos in America with the Trump administration it seems we are now seeing a measurable impact on weather model forecast skill.

The GFS suffering the most but the cut in balloon data essentially leaves a "hole" in the data which will impact ALL models.

Bad.

[Journal of Fluid Mechanics @JFluidMech]

Read a new #openaccess article in #JFMRapids:
"Internal waves generated by a plume impinging on a stratified fluid" by Charles W. Powell, Bruce R. Sutherland, Peter H. Haynes, John R. Taylor, et al.
📚 https://t.co/Y7yXWmYNRY

#JFM #OA #JFMRapids

[Charles Powell @Charles_p29]

@lyon_matteo You should’ve done Waves in part III ;)

[BBC Weather @bbcweather]

Check out these amazing Kelvin Helmholtz (fluctus) clouds seen in the Highlands this weekend.

A layer of faster moving air at the top of the cloud causes the cloud tops to topple over like waves in the sea.
Great example of the fluidity of the atmosphere.

📷 Adriano

[Scott Duncan @ScottDuncanWX]

Storm Bert undergoing explosive cyclogenesis and then merging into broad gyre of low pressure - creating an enormous wind field.

[Ali Mashayek @ali_mashayek]

Great opportunity to work on polar climate in Cambridge https://t.co/uMxBWEsPwB

[Charles Powell @Charles_p29]

Our results highlight the difficulty in resolving and parameterising convection in climate models. The mixing statistics are time sensitive and localised, so high temporal and spatial resolution is needed to capture the mixing.

[Charles Powell @Charles_p29]

My first PhD publication has just been released!

https://t.co/b7uGfkzfcJ

We consider a buoyant plume with a passive tracer penetrating into a stably stratified layer. This idealised flow is representative of many geophysical flows, for example tropical deep convection.

🧵⬇️

[Charles Powell @Charles_p29]

We also looked at metrics that quantify mixing. We identified a three-stage mixing process, each with distinct characteristics. It turns out the most efficient mixing occurs in a thin layer at the top of the plume.

[Charles Powell @Charles_p29]

The future is here!

[Charles Powell @Charles_p29]

Aurora visible from Cambridge!

[Nahel Belgherze @WxNB_]

Wow. Helene’s transition into a post-tropical cyclone is pure meteorological eye candy.

[CIRA @CIRA_CSU]

In the wake of Hurricane Helene, the upwelling of water and sediment can be easily seen in the eastern Gulf of Mexico.

[James Peacock @peacockreports]

The mesoscale low that ravaged southern UK yesterday is now doing interesting things over the southern North Sea.

Sustained deep convection & an eye-like feature suggests some warm-core characteristics, akin to the 'Medicane' cyclones sometimes seen in the Mediterranean.

[Andrew Miskelly @andrewmiskelly]

Sea breeze stabilising the atmosphere (putting cool air underneath warmer air) over the Gulf of Carpentaria coastline.