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class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Measuring device for snowpack</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:SNOTEL_site_454.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d8/SNOTEL_site_454.jpg/220px-SNOTEL_site_454.jpg" decoding="async" width="220" height="335" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d8/SNOTEL_site_454.jpg/330px-SNOTEL_site_454.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/d/d8/SNOTEL_site_454.jpg 2x" data-file-width="403" data-file-height="614" /></a><figcaption>The large panel in the foreground is the snow pillow</figcaption></figure> <p>A <b>snow pillow</b> is a device for measuring <a href="/wiki/Snow" title="Snow">snowpack</a>, especially for automated reporting stations such as <a href="/wiki/SNOTEL" title="SNOTEL">SNOTEL</a>. </p><p>The snow pillow measures the <a href="/wiki/Snow_water_equivalent" class="mw-redirect" title="Snow water equivalent">water equivalent</a> of the snow pack based on hydrostatic pressure created by overlying snow.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Any discrepancy due to bridging is minimized by the large dimension of the pillow, typically 9 square metres (11 sq yd). </p><p>Another application for snow pillows is to estimate the snow weight on a roof to warn of potential for roof collapse. </p><p>Snow pillows were developed in the early 1960s.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Set-up">Set-up</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Snow_pillow&action=edit&section=1" title="Edit section: Set-up"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Large dimensions (e.g. 3 m × 3 m) 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 m × 1 m) is the better choice, because of the weight of the filling of the snow pillow.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (February 2013)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Snow_pillow&action=edit&section=2" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Snowboard_(meteorology)" title="Snowboard (meteorology)">Snowboard</a></li> <li><a href="/wiki/Snow_gauge" title="Snow gauge">Snow gauge</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Snow_pillow&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://glossary.ametsoc.org/wiki/Snow_pillow">"Snow Pillow"</a>. <i>Glossary of Meteorology</i>. <a href="/wiki/American_Meteorological_Society" title="American Meteorological Society">American Meteorological Society</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2018-02-21</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Glossary+of+Meteorology&rft.atitle=Snow+Pillow&rft_id=http%3A%2F%2Fglossary.ametsoc.org%2Fwiki%2FSnow_pillow&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASnow+pillow" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFR.T._Beaumont,_Soil_Conservation_Service,_Portland,_Oregon1965" class="citation journal cs1">R.T. Beaumont, Soil Conservation Service, Portland, Oregon (October 1965). <a rel="nofollow" class="external text" href="https://doi.org/10.1175%2F1520-0450%281965%29004%3C0626%3AMHPPSG%3E2.0.CO%3B2">"Mt. Hood Pressure Pillow Snow Gage"</a>. <i>Journal of Applied Meteorology</i>. <b>4</b> (5). <a href="/w/index.php?title=American_Meteorology_Society&action=edit&redlink=1" class="new" title="American Meteorology Society (page does not exist)">American Meteorology Society</a>: 626. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1965JApMe...4..626B">1965JApMe...4..626B</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1175%2F1520-0450%281965%29004%3C0626%3AMHPPSG%3E2.0.CO%3B2">10.1175/1520-0450(1965)004<0626:MHPPSG>2.0.CO;2</a></span>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1520-0450">1520-0450</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Journal+of+Applied+Meteorology&rft.atitle=Mt.+Hood+Pressure+Pillow+Snow+Gage&rft.volume=4&rft.issue=5&rft.pages=626&rft.date=1965-10&rft.issn=1520-0450&rft_id=info%3Adoi%2F10.1175%2F1520-0450%281965%29004%3C0626%3AMHPPSG%3E2.0.CO%3B2&rft_id=info%3Abibcode%2F1965JApMe...4..626B&rft.au=R.T.+Beaumont%2C+Soil+Conservation+Service%2C+Portland%2C+Oregon&rft_id=https%3A%2F%2Fdoi.org%2F10.1175%252F1520-0450%25281965%2529004%253C0626%253AMHPPSG%253E2.0.CO%253B2&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASnow+pillow" class="Z3988"></span><span class="cs1-maint citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_journal" title="Template:Cite journal">cite journal</a>}}</code>: CS1 maint: multiple names: authors list (<a href="/wiki/Category:CS1_maint:_multiple_names:_authors_list" title="Category:CS1 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srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/89/Cyclone_Catarina_from_the_ISS_on_March_26_2004.JPG/60px-Cyclone_Catarina_from_the_ISS_on_March_26_2004.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/89/Cyclone_Catarina_from_the_ISS_on_March_26_2004.JPG/80px-Cyclone_Catarina_from_the_ISS_on_March_26_2004.JPG 2x" data-file-width="3032" data-file-height="2004" /></a></span></td><td><p class="asbox-body">This article about <a href="/wiki/Atmospheric_science" title="Atmospheric science">atmospheric science</a> is a <a href="/wiki/Wikipedia:Stub" title="Wikipedia:Stub">stub</a>. 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