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The image below shows the NAM's forecasted 500 mb heights and absolute vorticity for Sunday November 18, 2012 at 0300 UTC. Over Indiana there is no vorticity maximums or strong vorticity advection so upper level divergence is not expected due to vorticity advection. There is no other forcings that will cause upper level divergence as well so precipitation is not likely. There is strong postive vorticity advection along the the northern west coast and along the southern east coast. Where there is strong postive vorticity advection, we can expect vertical motion and precipitation.

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