Surface-850 mb lapse rate and terrain

Notes:

Looking at the evolution of the low-level (surface to 850 mb) lapse rate, one can see near neutral lapse rates persisting over the area between the Catskills and Allegheny mountains from late afternoon through the evening. More unstable low-level lapse surge toward the area from the southeast, later in the evening.

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[2100 UTC 29-Oct-2012]  [0000 UTC 30-Oct-2012]  [0300 UTC 30-Oct-2012]  [0600 UTC 30-Oct-2012] 
slide 31


Slide 31