It is an inverted trough aka easterly wave. The axis is onshore; however all the action with easterly waves are generally behind the axis. It is reflected aloft up to 500 mbs but no higher; a ridge dominates the entire area at 300 mbs which is centered at that level about 150 miles SE of Brownsville with a small shortwave moving west to east currently over central Texas moving east. As you see on satellite there is excellent divergence aloft and one might think there's something down there with outflow aloft.
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Re: Western Gulf of Mexico?