Thursday, January 19, 2012
Colorado continued to have high winds so as I drove around yesterday doing my birding I watched as rotor/wave clouds formed and dissipated. Though many formed into rotor/wave clouds, caused by Kelvin-Helmholz instability, they tended to be pretty wispy and dissipated quickly. This was about the best one, at least in coming out more definitively as a photo. I took this photo from Brush Hollow Reservoir near Penrose,CO looking west past Canon City. More to come from the day before. SeEtta
Wednesday, January 18, 2012
This afternoon, while doing a little birding to see what is around now that I am back from a long trip to So Texas, I drove out to Brush Hollow Reservoir about 15 northwest of Canon City to see if the recent high winds had blown anything unusual in. Indeed far in the distance I spotted this female Long-tailed Duck. She was more than 400 feet away when I took the top pic which is greatly enlarged from what I saw since I used my 400 mm lens with a 1.4 extender. Since my new Canon 60d dslr camera is not full frame the photo has an additional 1.6 magnification so the combination is approximately equivalent to a photo taken by a 900 mm lens or about 18 times the size seen with naked eyes. It is hard to see the little duck in that top pic but it, and a slightly larger Common Goldeneye near it, are directly under the text.
Monday, January 16, 2012
Two years ago I photographed a long set of rotor (that look like ocean waves) clouds southeast of Canon City, Co that I posted on this blog. I shared them with the Pueblo Weather Service meteorologists who confirmed the photos as what are called rotor clouds that are a rare phenomena caused by "Kelvin-Helmholtz instability" that is related to wind shear likely from strong winds near mountains. Well yesterday near dusk I caught this shorter segment of rotor clouds very near to the same location as those I took two years ago--both southeast of Canon City in Fremont County, both just east of the Wet Mountains and both during a period of high winds. I think I may have spotted these at the end of their run as they lasted about a minute (per time stamp on photos I took) before losing their shape. SeEtta