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fox-hughes 2015_charactersitics of days with abrupt increases in fd_JAMC.pdf (1.66 MB)
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Characteristics of some days involving abrupt increases in fire danger

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journal contribution
posted on 2023-05-18, 17:13 authored by Paul Fox-HughesPaul Fox-Hughes
A class of fire-weather events has been identified recently in which the normal, often diurnal, rise and fall of fire danger is interrupted by abruptly worsening conditions, or "spikes," for which fire managers may be unprepared.Frequent observations from a site in Tasmania, Australia, show that spike events are associated with the passage of negatively tilted upper-tropospheric troughs, leading to descent into the atmospheric boundary layer of dry, high-momentum air-a result that is supported by satellite water vapor imagery. Case studies from other major fire events, both in Australia and in the Northern Hemisphere, show similar characteristics. Statistically significant differences exist between the location and placement of trough and jetstreak features during spike events and normal fire-weather events, with differences in satellite water vapor imagery features also evident. The seasonality of spike events differs significantly from other fire-weather events, with their occurrence peaking from late spring to early summer in Tasmania, in contrast to broad summer primary and midspring secondary peaks for nonspike events.

History

Publication title

Journal of Applied Meteorology and Climatology

Volume

54

Issue

12

Pagination

2353-2363

ISSN

1558-8424

Department/School

Institute for Marine and Antarctic Studies

Publisher

American Meteorological Society

Place of publication

United States

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© Copyright 2015 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org.

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  • Open

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