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JH Skywatch: 4.14.14: Teewinot Under True Blue Skies (with a little chemminess as well)

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Published on Apr 14, 2014

Timeline History of Weather Modification Technologies and Programs
http://www.oilfreefun.com/2012/12/tim...

Weather Warfare 101
http://www.oilfreefun.com/p/weather-w...

Save Our Snow from Protect Our Winters
http://tukadika.com/2013/12/19/protec...


I think the following quote from Bruce Tremper's excellent book "Staying Alive in Avalanche Terrain" is appropriate to accompany this video...

"Radiation usually controls snow surface temperature much more than air temperature -- something that takes most people by surprise. If you want to understand snow and avalanches, you need to get this concept firmly down, so let's take a moment to dive in under the hood and get our hands dirty...The energy that reaches the Earth from the sun is composed of different wavelengths. First, there's visible light and ultraviolet radiation, which scientists call short-wave radiation, and second, there is heat, which we call long-wave radiation. Even though the snow is white -- meaning that it reflects most visible light -- when it comes to the heat part of the spectrum (long-wave radiation) snow is a nearly perfect "black body radiator" as physicists describe it. This means that it absorbs almost all of the radiant heat that reaches it and likewise, it very efficiently reradiates any heat it contains. In other words, if you shine a flashlight on snow, it reflects most of the energy, yet if you shine a heat lamp on the snow, it absorbs the energy and warms up quickly...

It's obvious enough that clouds can prevent much of the radiation from the sun from reaching the snow surface, but much less obvious how clouds block and trap radiation from going in the other direction -- from the snow surface to the sky. When the snow radiates its heat toward the sky, clouds can capture that same radiation and reradiate it back to the ground again, which we call the greenhouse effect. In other words, we can think of clouds like giant heat lamps in the sky. The snow surface can become much colder without clouds overhead than with clouds....

During the day, the greenhouse effect warms the snow surface most dramatically when the clouds are thin enough to allow some solar radiation to get though but thick enough to capture some of the outgoing radiation as well. This commonly happens with thin, wispy clouds, such as cirrus, or with a thin layer of fog or low clouds. For instance, you may be enjoying great, cold powder on a clear day and then when for or thin high clouds appear, suddenly the powder turns into something resembling mashed potatoes. Usually the air temperature didn't change very much, just the radiation balance." -- Bruce Tremper, Staying Alive in Avalanche Terrain (BUY THE BOOK!) http://www.amazon.com/gp/product/B001...

One Love. Peace.

The Sheepeater (my new site... please help it grow!)
http://www.tukadika.com/

Jackson Hole Skywatch (playlist)
http://tukadika.com/grand-teton-pass-...

OFF: Oil Free Fun (my old blog)
http://www.oilfreefun.com/

Friend me on Fakebook
http://www.facebook.com/max.mogren

When I'm stuck working to stack government cheese I can't make videos like these... thanks.
https://www.paypal.com/us/cgi-bin/web...

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