An approach for defining physically based fire weather index system classes for Ontario / C.C. Hanes, B.M. Wotton, C. McFayden and N. Jurko.: Fo123-2/29-2021E-PDF

"The Fire Weather Index (FWI) System codes and indices are commonly communicated and interpreted using a classification system (i.e., Low, Moderate, High, Extreme) by fire management agencies. Adjective classes were developed provincially shortly after the FWI System was introduced nationally in 1969. Class ranges were determined using a climatological frequency analysis, the basis of which was that on 2% of fire season days the FWI values should fall within the Extreme class, and Very Low represented days with FWI values of 0. Since then, these classes have become highly integrated into fire management and are, for example, commonly used for public awareness and education, high level operational preparedness, daily briefings, training curriculum and numerous mapping products. There has been little to no change in class ranges since their inception"--Abstract, page [1].

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Publication information
Department/Agency Canada. Natural Resources Canada, issuing body.
Great Lakes Forestry Centre, issuing body.
Title An approach for defining physically based fire weather index system classes for Ontario / C.C. Hanes, B.M. Wotton, C. McFayden and N. Jurko.
Series title Information report, 2562-0738 ; GLC-X-29
Publication type Series - View Master Record
Language [English]
Other language editions [French]
Format Electronic
Electronic document
Note(s) Issued also in French under title: Approche de définition des classes de la méthode canadienne de l'indice forêt-météo (IFM) fondées sur des données physiques pour l'Ontario.
Includes bibliographical references (pages 33-34).
Publishing information Sault Ste. Marie, ON : Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, [2021]
©2021
Author / Contributor Krezek-Hanes, C. C., author.
Description 1 online resource (vi, 34 pages) : maps, graphs.
ISBN 9780660402345
Catalogue number
  • Fo123-2/29-2021E-PDF
Subject terms Fire weather -- Ontario -- Forecasting.
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