TROWALTROugh of Warm Air ALoft. Typically used during winter weather, it is a "tongue" of relatively warm/moist air aloft that wraps around to the
north and west of a mature cyclone. It is best analyzed between 750-550 milibars using equivalent potential temperature (theta-e).
Areas of intense lift and frontogenesis are commonly associated with TROWALs, hence they are favored regions for heavy and/or prolonged
precipitation. During a winter storm, the heaviest snowfall amounts frequently occur along and north of the TROWAL axis.
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