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99.2 Selecting Moisture Scenarios As with fuel models, custom moisture scenarios are available during the session in which they were created. In future sessions, you must attach the folder in which they reside. It is not possible to select and attach individual moisture scenario files; the entire folder must be attached. Moisture scenarios are useful when developing custom fuel models. That option is se- lected for the FuelModeling.bpw and FuelModelingMetric.bpw worksheets. 12 Table Shading for Acceptable Fire Conditions A primary use of the BehavePlus option of Table shading for acceptable fire conditions is for prescribed fire planning. Acceptable conditions (such as 2- to 8 -ft flame length) can be specified; unacceptable conditions are then "shaded" on output tables. (They are actu- ally crossed off or left blank.) In this way, conditions such as wind speed and dead fuel moisture that result in acceptable conditions can be identified. The approach used in BehavePlus is different from that in the RXWINDOW program of the old BEHAVE system (Andrews and Bradshaw 1990). RXWINDOW reversed the calculations to determine environmental conditions that corresponded to specified fire conditions. That approach is not feasible given the additional fire models (such as crown fire) that are available in BehavePlus. To add acceptable fire conditions to your worksheet, check the box next to Table shading for acceptable fire conditions in the Module Selection window (Figure 1). Output vari- ables available for table shading are given in a table in the BehavePlus Variables paper (Andrews 2009). The added section of the worksheet lists output variables that allow input fields for mini- mum and maximum acceptable values (Figure 64). Entered values only affect results if the associated box is checked. If acceptable conditions are specified for flame length, val- ues outside of that range on the flame length output table are crossed off. Associated table entries are also crossed off on any other table that is produced (in this example, surface rate of spread and reaction intensity). It is a good practice to first show the values that are crossed out (unacceptable values) so that you see what is happening. Once you create the table that you want, you can produce a nicely formatted table with blank cells using Configure > Appearance preferences > Tables, checking the box next to Show only acceptable conditions when table shading, and recalculating the run. 76 USDA Forest Service Gen. Tech. Rep. RMRS-GTR-249.2010