Friday, December 25, 2009

a three-day snowing



12/24/2009, St. Paul, MN

a cloudy morning - see, gravity waves above Minneapolis




12/17/2009, Minneapolis, MN

a cold day



-20C, 12/15/2009 at Minneapolis, MN

Saturday, December 05, 2009

wind turbine in a stably stratified atmospheric boundary layer



Vortex structures (identified using |omega|-definition) during the beginning ~2min.