OKpowdah Posted May 17, 2013 Share Posted May 17, 2013 This is from the 12z NAM forecast for 18z Saturday. Really neat toroidal feature going on, evident the vertical velocity field (850mb and 700mb) ... circular area of subsidence, surrounded by an edge of rising air. This coincides with convective precipitation in the model. At 500mb, the vertical velocity pattern reverses ... core of rising motion coinciding with the model convection, surrounded by an edge of sinking air. So we can visualize the 3D circulations induced as a result of convection triggered in the model. In addition, there are effects on all levels of the atmosphere, relating to the divergence field acting on vorticity and affecting height tendency. All stuff we know ... the importance of convective parameterization in the model on upscale error growth etc. But kind of cool to visualize here. Link to comment Share on other sites More sharing options...
Amped Posted May 17, 2013 Share Posted May 17, 2013 I've seen thunderstorm clusters spread out in all directions when there is little steering flow kind of like a 360 bow echo. It looks like this is what the Nam is showing. Link to comment Share on other sites More sharing options...
Stebo Posted May 18, 2013 Share Posted May 18, 2013 The 12z NAM from today also has it Link to comment Share on other sites More sharing options...
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