Star-shaped snowflakes

This morning I read an article on the weather channel about star-shaped snowflakes that had fallen during a snow storm in New York State:

http://www.weather.com/travel/commuter-conditions/news/snow-stars-winter-storm-juno

I had never heard of such kind of snowflakes.

I took a short hike into the woods at Celery Bog Park later in the morning and noticed that some of the new snow flakes that had fallen overnight also had a star-shaped character to them.  Here are some photos, all taken January 27, 2015.  There are only a couple small star-shaped flakes in each photo, you have to look close. 

More links to star-shaped snowflakes:

http://io9.com/with-the-blizzard-comes-these-star-shaped-snowflakes-1681967156

http://gothamist.com/2015/01/26/its_snowing_stars_u_guys.php