Skip to main content

View Diary: ALERT: Major Severe Weather (Potential Derecho) Wednesday From Chicago to Washington DC (145 comments)

Comment Preferences

  •  I get what happens when it races out, but... (2+ / 0-)
    Recommended by:
    weatherdude, indubitably

    what sends it racing out -- and in that direction -- in the first place?  What am I missing?  Very low pressure in advance of the front 'sucking' the pool forward?  

    mx tx

    (-7.62,-7.33) Carbon footprint 11.3 metric tons. l'Enfer, c'est les autres.

    by argomd on Tue Jun 11, 2013 at 03:24:14 PM PDT

    [ Parent ]

    •  The cold pool (2+ / 0-)
      Recommended by:
      argomd, indubitably

      essentially powers itself through the bookend vortices and rear inflow jet. The thunderstorms are forming along and just a little bit behind the leading edge of the cold pool, which is why they're all moving in the same direction.

      If the rear inflow jet gets too strong, it pushes the cold pool out ahead of the storms. I'm sure there are other ways that the cold pool could rush out ahead of the convection (or hold the convection back), but I can't think of any others off the top of my head.

      Facebook
      If you say "gullible" real slow, it sounds like "green beans."

      by weatherdude on Tue Jun 11, 2013 at 03:37:33 PM PDT

      [ Parent ]

      •  Gotcha! Thanks! (2+ / 0-)
        Recommended by:
        weatherdude, indubitably

        I was missing the strength of that rear inflow.  Sorry to take your time, but greatly appreciate the understanding!

        (-7.62,-7.33) Carbon footprint 11.3 metric tons. l'Enfer, c'est les autres.

        by argomd on Tue Jun 11, 2013 at 03:46:38 PM PDT

        [ Parent ]

        •  Ohhhhh oh oh. I think I answered the wrong (2+ / 0-)
          Recommended by:
          indubitably, argomd

          question. Are you asking why the cold pool starts moving in the first place?

          If so, it's because the vertical wind shear makes the storms start moving around and form into lines, which gets the storms (and their cold pools) moving in one direction.

          Facebook
          If you say "gullible" real slow, it sounds like "green beans."

          by weatherdude on Tue Jun 11, 2013 at 03:48:53 PM PDT

          [ Parent ]

          •  You replied well to what I'd asked, thanks! (0+ / 0-)

            I was worried about the dynamics of an individual cold pool.  The behavior of the storm system -- its linearity, e.g. -- seems knowable from the scale size of persistent perturbations in the physics.  

            Can't ask for too much specificity in a grossly chaotic system, after all.

            Thanks again for your time!

            (-7.62,-7.33) Carbon footprint 11.3 metric tons. l'Enfer, c'est les autres.

            by argomd on Wed Jun 12, 2013 at 07:51:53 AM PDT

            [ Parent ]

Subscribe or Donate to support Daily Kos.

  • Recommended (133)
  • Community (55)
  • Baltimore (45)
  • Bernie Sanders (36)
  • Civil Rights (35)
  • Culture (26)
  • Freddie Gray (21)
  • Elections (20)
  • Racism (20)
  • Law (20)
  • Education (20)
  • Hillary Clinton (19)
  • Economy (18)
  • Labor (17)
  • Politics (16)
  • Rescued (16)
  • Media (15)
  • Texas (15)
  • 2016 (15)
  • Barack Obama (13)
  • Click here for the mobile view of the site