Frontogenesis / omega / EPV cross-sections
Notes:
Southeast – northwest cross-sections of frontogenesis (brown contours), vertical motion (yellow contours) and negative geostrophic EPV (indicating instability to slantwise motions, shaded blue), indicated that enhanced upward vertical motion was forecast to develop over northeast Pennsylvania during the afternoon on the 18th, continuing into the 19th. The lift was forecast above a distinct, sloping frontal zone, and was co-located with reduced stability, enhancing the potential for banded, heavier snowfall.|
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Valid Sun 1800 UTC 18-Nov-2007 Valid Mon 0000 UTC 19-Nov-2007 Valid Mon 0600 UTC 19-Nov-2007 |
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Slide 12