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Couldn't Get to Work this Morning (TEXAS...)
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<blockquote data-quote="UnconTROLLed" data-source="post: 687386" data-attributes="member: 18708"><p>The pictures do not look like 10-15" of snow because many of the surfaces the snow falls onto are above 32 degrees, thus melting and compacting. Also sublimation is an issue. </p><p></p><p>When the co-op spotters or official obs from DFW report 12" of snow, that 12" of snow is measured every 6 hours on a white 4x4 piece of fiberglass or fiberboard. This ensures rthe most accurate and unbiased measurements. If you measure every hour, compaction and sublimation are not involved so much and you end up with an inflated total. </p><p></p><p>If you measure on black asphalt, similarly you end up with biased measurements ( as in the 4" you see in some of the pictures), as the snow compacts and melts quickly with the surface /ground temperature of that dark surface above 32 degrees -the mid-feb laser sun angle in the south, which incidently melts the fallen snow THROUGH the clouds, helps this process.</p><p></p><p>However, as you can see by the pictures, there are areas the snow stacked up very well , mostly likely on the grass, trees, overpasses, and vehicles.</p></blockquote><p></p>
[QUOTE="UnconTROLLed, post: 687386, member: 18708"] The pictures do not look like 10-15" of snow because many of the surfaces the snow falls onto are above 32 degrees, thus melting and compacting. Also sublimation is an issue. When the co-op spotters or official obs from DFW report 12" of snow, that 12" of snow is measured every 6 hours on a white 4x4 piece of fiberglass or fiberboard. This ensures rthe most accurate and unbiased measurements. If you measure every hour, compaction and sublimation are not involved so much and you end up with an inflated total. If you measure on black asphalt, similarly you end up with biased measurements ( as in the 4" you see in some of the pictures), as the snow compacts and melts quickly with the surface /ground temperature of that dark surface above 32 degrees -the mid-feb laser sun angle in the south, which incidently melts the fallen snow THROUGH the clouds, helps this process. However, as you can see by the pictures, there are areas the snow stacked up very well , mostly likely on the grass, trees, overpasses, and vehicles. [/QUOTE]
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