Biological and Environmental Research - Earth and Environmental System Sciences
Earth and Environmental System Modeling

Three Western Pacific Typhoons Strengthened Fire Weather in the Recent Northwest U.S. Conflagration

TitleThree Western Pacific Typhoons Strengthened Fire Weather in the Recent Northwest U.S. Conflagration
Publication TypeJournal Article
Year of Publication2021
AuthorsAllen, Jacob Stuivenvol, Wang S.-Y. Simon, LaPlante Matthew D., and Yoon Jin-Ho
JournalGeophysical Research Letters
Volume48
Number3
Abstract / Summary

Strong winds that accentuated a fire outbreak in the western United States in early September of 2020 resulted from an atmospheric wave train that spanned the Pacific Ocean. Days before the atmospheric waves developed in the United States, three western Pacific tropical cyclones (typhoons) underwent an extratropical transition over Korea within an unprecedentedly short span of 12 days. Using a climate diagnostic approach and historical forecast data, it was found that the amplitude of the atmospheric waves accompanying the western U.S. fire weather would not have been so profound if not for the influence of these typhoons. Together, the recurving typhoons provided a significant source of wave activity flux directed toward North America – amplifying the ridge over the U.S. west coast while deepening the trough in central Canada. This anomalous circulation produced the severe frontal system that caused extreme winds in western Oregon, Washington, and California – rapidly spreading fire.

URLhttp://dx.doi.org/10.1029/2020gl091430
DOI10.1029/2020gl091430
Journal: Geophysical Research Letters
Year of Publication: 2021
Volume: 48
Number: 3
Publication Date: 02/2021

Strong winds that accentuated a fire outbreak in the western United States in early September of 2020 resulted from an atmospheric wave train that spanned the Pacific Ocean. Days before the atmospheric waves developed in the United States, three western Pacific tropical cyclones (typhoons) underwent an extratropical transition over Korea within an unprecedentedly short span of 12 days. Using a climate diagnostic approach and historical forecast data, it was found that the amplitude of the atmospheric waves accompanying the western U.S. fire weather would not have been so profound if not for the influence of these typhoons. Together, the recurving typhoons provided a significant source of wave activity flux directed toward North America – amplifying the ridge over the U.S. west coast while deepening the trough in central Canada. This anomalous circulation produced the severe frontal system that caused extreme winds in western Oregon, Washington, and California – rapidly spreading fire.

DOI: 10.1029/2020gl091430
Citation:
Stuivenvolt Allen, J, S Wang, MD LaPlante, and J Yoon.  2021.  "Three Western Pacific Typhoons Strengthened Fire Weather in the Recent Northwest U.S. Conflagration."  Geophysical Research Letters 48(3).  https://doi.org/10.1029/2020gl091430.