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http://www.youtube.com/watch?feature=player_embedded&v=S407AwijOcc#!

This was posted yesterday at the “before it’s news” site.
Thought this was interesting.

Youtube vid on volcanic gas emissions from Salton Field.

Opinions?

Thanks! Interesting, but IMO, what he's referring to are the outflow boundaries of large thunderstorms moving through the area. Notice how they also (the red radar returns) dissipate as the outflow boundary grows.

This is typically what happens when cumulonimbus collapse. I got the opportunity to fly a small Cessna backwards once when I took off near one after it began its collapse and I turned to meet the outflow head-on! Since I was just clearing the trees after leaving the runway, there was no chance to out run it. I instinctively knew, or God put it in my head, that I would have stalled as soon as the wind shear passed, if I tried to turn away.

As it was, I fought to keep control until I had about 500' of altitude before turning away from the thunderstorm. As I cross the wind-shear, my airspeed (100+) dropped below stall and I had to dive to keep from stalling. I estimate those winds to have been about 60 mph. It was an exciting ride in a Cessna 150... lol I was competent enough at the time to land in 35 knot winds.

Another thing on the video, shock waves from explosions travel at the speed of sound. Much faster than what he's showing on his radar.

Helps explain the spread of the accumulated H2S though.