Problem with Step 6 of the Climatic Water Deficit Toolbox identified and a workaround found

A while back I created the Climatic Water Deficit Toolbox for  generating climatic water deficit and actual evapotranspiration rasters. Recently I was running into a few issues with step 6 - the calculation of the soil water balance.  I was getting errors like "ERROR 010240: Could not save raster dataset ...\g_g882 with output format GRID".  It was a bit puzzling because I hadn't seen the tool creating the g_g grids before.  It turns out when the extent of the available water supply raster and the heat load raster differ then Arc creates temporary GRID files.  The remedy for this is to ensure that the available water supply and heat load rasters match exactly in extent, cell alignment, and projection.  After the two rasters were lined up the problem went away completely.