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TeachMeFinance.com - explain TROWAL TROWAL The term 'TROWAL' as it applies to the area of the weather can be defined as ' TROugh 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'. Previous 5 Terms: Tropopause Jet troposphere Tropospheric Emission Spectrometer tropospheric ozone (O3) Trough Next 5 Terms: TRPCL TRQ TRRN True Negatives True Wind About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.