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Summary

• Forcing for upward motion during the early stages of the event was associated with upper level divergence in the left exit of a jet off the southeast coast, and isentropic lift with a southeasterly flow associated with the upward branch of the jet exit region circulation.
• During the later stages of the event, an east-west oriented trowal developed, which was associated with increasing mid-level frontogenesis and frontogenetical forcing.
• Instability above the frontogenesis appeared to be modest.