As a former senior investigator (SI) at HFR during the snow seasons from 2008 to 2014, the SI proposes to reinstall sensor networks to validate new algorithms developed for the UEBMOD snow model forest algorithms (Hellström, 2000). In particular, the SI will set up 10X10 meter ground plots with 9 regularly spaced 3/4 inch PVC snow stakes and battery powered automatic weather instruments at three sites including: the mixed hardwood stand near the HF snow pillow, near the Eastern Hemlock (Tsuga canadensis) walk-up tower, and one within the fenced area of the open Fisher meteorological station. Snow water equivalent measurements from the Harvard Forest Snow Pillow. The SI will make weekly visits to the sites to measure and record snowpack density and structure observations. In addition, the SI will incorporate small outdoor nature-cameras to take daily snap-shots of the stake network to reduce the need for more frequent site visits. Measurements will help to validate and improve forest cover algorithms that simulate impacts on liquid and frozen water and energy balance variables in the UEBMOD model, ultimately estimating canopy interception and accumulation and losses on the ground. This experiment is timely with Eastern Hemlock succession from the Hemlock Woolly Adelgid and results are significant for studies related to the woolly adelgid impact on eastern hemlock forests.