Eta 24-hour forecast 950 mb ageostrophic wind (purple barbs), wind (brown barbs) and theta-e, valid at 1/6/05 12 UTC.

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Speaker Notes:

The data on this slide valid at 06/12 UTC, shows near neutral temperature advection at 950 mb over northeast Pennsylvania by the real wind, and strong cold advection by the ageostrophic wind. The combination of strong warm advection aloft, and near neutral advection at low-levels would help to produce a sounding favorable for freezing rain.