Snow Science: an annotated list to topics

December 17th, 2016
For those interested in the science of snow, I give an annotated list of relevant blog links.   [image:45]   I) Seminar about snow science (sequence of four videos): II) All the different types… more »

Two-level nature of branched crystals

December 11th, 2016
The common branched crystal looks like a paper cut-out, but actually has a complex 3-D nature. One aspect of this nature, which I have alluded to in prior posts, is the two-level structure: What appears to be happening on one plane, is actually… more »

How some snow crystals hide their droplet origin

December 5th, 2016
Look closely at the center of a snow crystal. In many, or most, you will often not find a droplet center as we described in the previous post. Indeed, for the columnar crystals, you may never see a droplet center. As an example, look at the center of… more »

How some snow-crystal centers retain their droplet origin

November 22nd, 2016
If you zoom in on the center of some snow crystals, you may see a small circle, or near circle. In some cases, the crystal will have other circles of similar size as well, but the one to focus on is the one at the exact center of the crystal. Here marks… more »

How the water molecules make corner pockets

November 11th, 2016
As I mentioned in my previous post, the formation of corner pockets on ice crystals is inexplicable by the standard theory of snow-crystal growth. Akira Yamashita had recently proposed a mechanism for corner pockets, though he had applied it to a… more »

Akira's Corner Pockets

May 10th, 2016
The evanescent snow crystal appears out of nowhere The lines and boundaries on its faces tell a story a story of its birth and life But before it all vanishes does anyone hear the story?   A few years back, a correspondent of mine, Professor Akira… more »

Standard P1a Hexagonal Crystal, Front and Side

December 19th, 2014
It didn't start so symmetrical, but became so as it grew: This, the left crystal of the pair described two posts below, grew much more slowly on its basal faces (front & back in the left image). The way it grew, and its big difference with the crystal… more »

Lots of Hair Ice

December 19th, 2014
My older sister sent me this photo on a recent morning. This is hair ice growing from an alder tree. All of it grew overnight, formed when liquid water near the outer trunk surface (beneath the bark) froze. This creates an ice front in each pore-like… more »

A Crystal Pair, Several Views, and a "Man on the Crystal"

December 19th, 2014
One advantage of the new apparatus is the capability to grow up to three crystals at a time, each on its own capillary. It is also very useful being able to move each capillary around. Having success with a single crystal, we tried it with two, and much… more »

New Capillary Crystal-Growth Device

December 11th, 2014
After several years of planning and several more years of construction, our new crystal-growth device is operational. We are now tuning the electronics, vacuum system, data collection method, and other aspects, but we can indeed produce ice crystals on… more »