This lecture covers the energy balance equation for snowpack, including terms like net shortwave radiation, net longwave radiation, sensible heat flux, latent heat flux, advected heat flux from rain, ground heat flux, and loss of energy due to melt water. It also discusses albedo, albedo parametrizations, spectral albedo, grain size, and angle, as well as conductive heat flux, absorption coefficient of ice, and turbulent fluxes. The instructor explains the relationships between radiant and kinetic temperatures, IR imaging, snow emissivity, and the effects of topography and canopy on snow energy balance.