]]> http://www.thunderstruck.com/beautiful-storm/feed 0 http://www.thunderstruck.com/contrail-science http://www.thunderstruck.com/contrail-science#comments Mon, 22 Nov 2010 17:15:04 +0000 GoNorthWest http://www.thunderstruck.com/?p=290 I stumbled (by using StumbleUpon!) an interesting website today called Contrail Science. The tagline for the site is “The Science and Pseudoscience of Contrails and Chemtrails,” and the current article on the home page is a very detailed explanation, using pictures, flight info and good science, about the alleged “missile launch” in Los Angeles a few weeks ago. The author of the site has numerous posts detailing the basics about contrails, some good stuff about contrail chemistry, and pictures galore! Contrails come in many shapes and sizes, and there are additional phenomena seen in the weather that act similarly to contrails. If you are at all interested in those trails you see in the sky, or want a lively debate on the “LA missile launch,” you should absolutely check out this site!

"LA Missile Launch"

Tucson Lenticular Clouds

Unfortunately, because I took the picture with my iPhone, the clouds are a bit hard to see. But, if you look closely at the clouds in the center of the image, you’ll notice that they’re rounded and somewhat “flying saucer” shaped. Here’s a better picture of the same type of clouds, that I took in Mt Shasta, CA:

Mt Shasta Lenticular Clouds

These types of clouds are called Lenticular clouds, and they are stationary, lens shaped clouds that form at high altitudes. Typically, these clouds form on the downwind side of a mountain where warm, moist air is flowing, creating a series of large-scale standing waves. If the temperature at the crest of the wave drops to the dew point, moisture in the air may condense to form lenticular clouds. As the moist air moves to the trough of the wave, if it’s warm enough, it may evaporate back to vapor. Under certain conditions, long strings of lenticular clouds can form near the crest of each successive wave, creating a formation known as a wave cloud. And, because these clouds have a characteristic lens appearance and smooth saucer-like shape, they are often mistaken for UFOs (or “visual cover” for UFOs).

The air in the area of lenticular clouds is great for gliders, who seek out and ride the updrafts associated with the standing waves, but not so great for pilots of powered aircraft who are concerned with the turbulence. “Wave lift” often found in areas with lenticular clouds is often so smooth and strong that gliders can sail to incredible heights and distances. In fact, the current gliding world records for both distance (over 3,000 km; 1,864 mi) and altitude (15,460 m; 50,721 ft) were set using such lift.

I’ve always loved how lenticular clouds look. In almost every trip past Mt Shasta in California, where I have been able to see the mountain, lenticular clouds are present. I’ve also noted them quite frequently on the top of Mt Rainier in Washington. They are very beautiful clouds, but you can rest assured there are no aliens hiding in them!

I hope you like the new direction of this blog, and I look forward to and welcome your comments. Thanks for visiting “Ive Been Thunderstruck!”

An awesome looking supercell!