Restart button on the Main Page to do this. Remember to update your Total Rainfall value (if used) in the Settings page, otherwise you could get a deluge of rain on that first day.
Should automated uploads from a weather station data file stop for some reason (eg. wx stn software crash) enabling this feature allows FWI Calculator to automatically insert correctly dated data fields that carry on the last known FFMC, DMC, DC & BKDI values.
In the past FWI Calculator just stopped and that was that, which I have discovered to be a real agony. With Fudge enabled FWI Calculator will continue inserting these dummy fields until a legitimate weather station input file becomes available again (eg. your wx stn software is rebooted).
The obvious caution is if you don't notice it, it could continue for some time (forever). To enable you to find and correct these "fudged" records quickly Choose Display/Fudged Records on the menu bar, only "fudged" records will be shown. You may edit these as normal to insert the correct data for that day/days. If these records go on for too long, your FWI Indices could become meaningless. After a long period of Fudged records it could take 10-30 days before values stabilise again!
If you don't use this feature once FWI Calculator stops you'll need to insert in ALL the missed days up until the present, use the Restart button on the Main Page to do this. Remember to update your Total Rainfall value (if used) in the Settings page, otherwise you could get a deluge of rain on that first day.