This animation of GOES-12 6.5 micrometer "water vapor channel" images shows extratropical cyclone Noel during the 03-04 November 2007 period. Model fields are from the GFS40: the red contours are the pressure of the 1.5 Potential Vorticity Unit (PVU) surface (the "dynamic tropopause"), and the cyan contours are the GFS40 500 hPa heights.
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