Pyroclastic Flow – Amazing Video and Pics.

February 4th, 2014 at 1:29 pm by under Bill's Blog, News, Weather

sinabung nbcnews   Check out the amazing video of the pyroclastic flow coming down Mt. Sinabung in Indonesia (Sumatra), and check out the “tornadoes” that develop as the hot mass slides down the mountain.  (pic. from nbcnews)  Also, check out the spectacular pics. of the ice storm in Slovenia.   Significant and welcome rain for N. California, S. California stays mostly dry.

6 Responses to “Pyroclastic Flow – Amazing Video and Pics.”

  1. snowsearch says:

    Very interesting video and that’s some serious ice in Slovenia!

  2. Bill Gelineau says:

    Bill, the rotation of the tornadoes in the pyroclastic flow video struck me as odd. I did confirm that the Sinabung volcano is North of the Equator. So, I expected these tornadoes to spin in a counter-clockwise direction. But, these spin the opposite. Is that the nature of the “heat-created” tornado – an instant high-pressure center that acts the opposite of our normal storm lows? Just curious.


    1. Cort S. says:

      Great observation, Bill. For small-scale vortexes such as these (including waterspouts, dust devils, and fire tornadoes), the Coriolis Force is negligible. They can spin in whichever direction the ambient wind field starts them off on.

  3. dave says:

    Do correlation exist between the eruption of Mt. Sinabung and the persistent Winter weather pattern the US is now experiencing?

    1. Bill Steffen says:

      Correlation, but not causation. I don’t think they are related. There is a delay factor for one and this winter got cold before Sinabung had the biggest eruption. That eruption was still nothing compared to Pinatubo (Philippines) in 1991. There certainly was a noticeable drop in global temperature after that volcano, which pushed as up into the stratosphere, about 3 times higher than Sinabung.

      1. dave says:

        Are Mt. Sinabung dust particles arriving here, embedded in the snowflakes?

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