this makes me glad to be a modeling guy!

A su set photo. The lower quarter is silhouetted with tree and grass. The sky is blue and orange with clouds lit in pink.

sunset.

A flowering dogwood tree zoomed into two flowers. Light pink with tinged edges on the petals.

dogwood.

Surface Runoff Discrepancy in Urban‐PLUMBER Land Surface Models Large discrepancies in simulated urban surface runoff appear between urban land surface models (ULSMs) Not all ULSMs capture the effect of the impervious fraction on surface runoff Simplified UL...

New study out in #GRL on modelling of #urban #runoff: Current urban land surface models in Urban-Plumber collection have difficulties in representing urban runoff and as such water budget in #cities, and as such #cooling potential against urban #heat agupubs.onlinelibrary.wiley.com/doi/10.1029/...

The proposal count this cycle is ~59% of that in the previous cycle, and the compute request is only 34% of the previous cycle. So we had fewer proposals, which skewed toward smaller requests.

I serve on the NSF NCAR CISL HPC Allocations Panel (CHAP). For comparison, here are the past two years of requested core-hours and storage space (CPU/GPU/Store):

SP24: 631M/379K/3.2PB
FA24: 1.3B/1.2M/7.3PB
SP25: 505M/2.5M/1.7PB
FA25: 657M/685K/2.5PB
SP26: 226M/1M/2.5PB

I am going to do the same and see if it causes my internal stock value in the lab to skyrocket for no reason.

A black, single-layer cake. The top is decorated with a pastel-rainbow telescope and galaxy map behind it.

A different view of the cake, showing the galaxy map spilling over the side.

DESI finished its originally planned survey last night!! ..and will keep going :)

I made a cake to celebrate. 🌌🔭
@desisurvey.bsky.social

Yeah, Wisconsin and Iowa really got hammered yesterday.

Sketch from Leonardo da Vinci of obstructions in water with the turbulent effects detailed.

In another, he placed obstacles in water:

“So moving water strives to maintain the course pursuant to the power which occasions it, and if it finds an obstacle in its path it completes the span of the course it has commenced by a circular and revolving movement."

Vorticity!

4/4

Sketch from Leonardo da Vinci of water pouring into a pool, with detailed turbulence eddies.

He further noted:

"... the smallest eddies are almost numberless, and large things are rotated only by large eddies and not by small ones, and small things are turned by small eddies and large"

Seems to hint at Richardson’s turbulence energy cascade!

3/4

Sketch from Leonardo da Vinci of water pouring into a pool, with detailed turbulence eddies.

He let water flow through a square hole into a pool and observed:

"the water has eddying motions, one part of which is due to the principal current, the other to random and reverse motion"

That sounds similar to the idea of Reynolds decomposition!

2/4

He was also one of the first to attempt the scientific study of turbulence (turbolenza), and was a pioneer of flow
visualization to study it ...

1/4

20Z special sounding launched by Norman, OK NWS (OUN).

20Z special sounding launched by the NWS Norman forecast office. Very large CAPE values but still rather modest low-level wind shear (16 kt) in a virtually uncapped environment. This profile would tend to favor very large hail given rather linear hodographs in the mid-to-upper levels.

Yes, Bashford, not Basford. Give me an edit button, cowards! I’m too imperfect!

Separating out the time and space numerics will make it easier for users to test the effects of numerical methods and to more easily add in their own schemes. I think I've about tapped out the improvements to speed—this thing is pretty fast.

GitHub - jeremygibbs/pyburgers: One-dimensional DNS and LES of Burgers turbulence written in Python One-dimensional DNS and LES of Burgers turbulence written in Python - jeremygibbs/pyburgers

PyBurgers v2.1.0 is out. I made model numerics pluggable, adding 2nd/4th-order centered spatial discretization on top of spectral scheme, and added Adams-Basford and Adams-Moulton 2nd-order time schemes to join RK3. Bug fixes and more optimizations. 🧪🌊

github.com/jeremygibbs/...

Artemis 2 commander Reid Wiseman broke NASA protocol to save the mission's moon mascot: 'It's hard not to love this little guy. I can't let Rise out of my sight' "I stuffed that little guy in a dry bag we had in our survival kit, and hooked the bag onto my pressure suit."

I genuinely love this. Astronauts, like kids, know that you do not leave your stuffies behind.

My family and I watched the Artemis return this evening and it was magical — a reminder that investing in ourselves and dreaming big can connect us all.

Air travel is so predictable these days …

You travel 10 miles or nearly 700,000 miles only to arrive at your destination on time and still have to wait an hour for a gate to open so you can exit the aircraft …

A tornado in black-and-white. The ground is in silhouette and the majority of the sky is washed out. A tornado extends to the ground in grey, while the parent storm is very dark.

For Flickr Friday®, here is a photo of a tornado from 1949 in Manhattan, Kansas. You can check out more cool photos from NSSL here: www.flickr.com/photos/noaan...

🧪🌊

Happy to share a new publication, in early release for @ametsoc.org Weather and Forecasting (led by Collin DeYoung), detailing unique observations of the Lake Michigan marine atmospheric boundary layer and their use for evaluating HRRR forecasts!

journals.ametsoc.org/view/journal...

I saw a video of a softball game that stopped mid-inning during the Artemis launch, with players pointing to the sky in excitement. All the joy surrounding the mission, and the awe in viewing these images, reminds me of how science and our curiosity bring humans together. I wish we held that tight.

we should be nicer to our atmosphere!

The Orion capsule on the left, the crescent moon next to it, and the much smaller crescent earth next to it.

Holy wow.

Artemis is about to go behind the moon from our POV so that's Earth as it starts to slide behind the moon from the space capsule's POV!

My oldest son is not phased much by wildlife, but cassowaries freak him out — probably some prehistoric warning encoded in his dna, “That’s a freaking dinosaur. Run.”

Artemis II astronauts race to set a new distance record from Earth and behold the moon's far side The Artemis II astronauts are racing toward a new distance record on their moon flyby. Apollo 13's crew currently holds the record for the humans traveling the farthest from Earth.

BREAKING: Artemis II breaks Apollo 13’s distance record as humans travel farther from Earth than ever before.

A ladybug on a plant

lady.

Current status.