Montana Public Radio

clouds

'Field Notes:' How 'Moon Dogs' Are Made

Dec 29, 2020
A lunar halo, or moon dog. Ruka, Finland
Timo Newton-Syms (CC-BY-SA-2)

Moon dogs have many names: lunar halos, moon rings, or winter rings. Their scientific name is “paraselenae” and they are made visible by a combination of specific circumstances.

Snow-Making 101

Mar 1, 2020
Flickr user, Dawn Perry (CC-BY-NC-2.0)

Few things brighten a typical Montana winter day like a little snowfall. Right when you feel that you can't take another grey day, a couple of inches of heaven fall to raise your spirits. But just how do these floating flakes come to be? Snow obviously comes from clouds, but not just any cloud.

Field Notes: Winter Clouds

Feb 25, 2018
Winter clouds
(PD)

At no other time is the parting of clouds felt more powerfully than outdoors, at the height of winter.

On this particular day, the clouds break intermittently and when they do, motion ensues. The peeps and chatters of birds start, and you can see them dart and cling through a white and shifting world. The snow itself starts to awaken and come alive - melty, unstable layers slide down the steeples of trees.