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 Mesonet | Spread Component

Spread Component

Idabel Broken Bow Wister Talihina Clayton Cloudy Hugo Antlers Lane Durant Wilburton Stigler Sallisaw Webbers Falls Cookson Westville Tahlequah Eufaula McAlester Stuart Centrahoma Tishomingo Holdenville Madill Burneyville Ardmore Newport Fittstown Sulphur Haskell Porter Okmulgee Inola Bixby Tulsa Okemah Seminole Ada Byars Pauls Valley Ringling Hectorville Bristow Shawnee Ketchum Ranch Washington Norman Chandler Spencer OKC East Waurika Chickasha Acme Oilton Minco Guthrie Walters Apache Grandfield Medicine Park Fort Cobb Tipton Altus Hobart El Reno Hinton Perkins Marena Stillwater Lake Carl Blackwell Pawnee Red Rock Marshall Kingfisher Watonga Weatherford Bessie Jay Pryor Skiatook Wynona Burbank Miami Vinita Nowata Talala Copan Foraker Newkirk Blackwell Mangum Hollis Erick Putnam Butler Cheyenne Breckinridge Lahoma Fairview Seiling Camargo Medford Cherokee Alva May Ranch Freedom Woodward Arnett Buffalo Slapout Beaver Hooker Goodwell Boise City Kenton Elk City Valliant Eva Yukon
The spread component (SC) is numerically equal to the theoretical forward speed of the headfire in feet/minute. It is the most variable of the fire danger indices, with variations being caused by changes in wind speed and in moisture content of the live and dead fuels. SC is another index produced by the Oklahoma Fire Danger Model. Wind speed, slope and fine fuel moisture are key inputs in the calculation of the spread component, thus accounting for a high variability from day-to-day. Spread component is a function of the fuel model being used, the live and dead fuel moistures, and the weather conditions. Accordingly, inaccuracies in the NAM weather forecast will lead to inaccuracies in the SC forecast. Of course, if the fuel types and loads are substantially different than those in the fuel model being used, there will be inaccuracies as well.