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Effective Windspeed (EWS)

EWS integrates the effect of winds and slope on a surface fire behavior estimate based on the fuel model fire is expected to be burning in. These tables produce the resulting EWS when winds are blowing upslope

For downslope and cross-slope winds, use the “0” mph row in the Midflame Windspeed (MFWS) column to estimate the “slope equivalent windspeed.” It can be used as the MFWS in the lookup tables to produce slope vector fire behavior estimates for use in the vectoring process (5.2)