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Keywords:

  • extratropical cyclone;
  • blocking;
  • Lorenz energetics

Abstract

This study presents the Lorenz energetics of an exceptional baroclinic storm propagating to Nome (Alaska) in October 1992, where it caused severe flooding. The storm track was greatly influenced by the interaction with a blocking high a week before the cyclone was formed. The energetics gives new insights into this dramatic storm, suggesting that the large-scale environment was responsible for its long trajectory and intensification. The blocking high also provided the dynamic steering that facilitated the wave propagation and baroclinic growth. Our results show that the environmental energy transfers can be used as an informative metric for severe storms. Copyright © 2010 Royal Meteorological Society