Minor Bug Fix for Longwave … Fog

• Corrected index in radiation driver used to represent cloud base. Only in error when cloud base is at the lowest atmospheric layer -i.e., when fog is indicated

• Correction resulted in an increased surface downward longwave fluxes of <40 W m-2 in “typical” atmospheric conditions not associated with an inversion; impact depends on low-level profiles of temperature and moisture (vapor & condensate)