The snow pillow measures the water equivalent of the snow pack based on hydrostatic pressure created by overlying snow.. Any discrepancy due to bridging is minimized by the large dimension of the pillow, typically 9 square metres (11 sq yd).
Another application for snow pillows is to estimate the snow weight on a roof to warn of potential for roof collapse.
Snow pillows were developed in the early 1960s.
Large dimensions (e.g. size 3 × 3m) of the pillow prevent any bridging that might occur from having an effect on the measurement readings. For snow pressure measurement on roofs using a smaller snow pillow (e.g. 1 × 1m) is the better choice, because of the weight of the filling of the snow pillow.
- "Snow Pillow". Glossary of Meteorology. American Meteorological Society. Retrieved 2018-02-21.
- R.T. Beaumont, Soil Conservation Service, Portland, Oregon (October 1965). "Mt. Hood Pressure Pillow Snow Gage". American Meteorology Society. Retrieved 2007-09-10.CS1 maint: Multiple names: authors list (link)
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