Meteorologists and other atmospheric scientists distinguish between a trace and zero accumulation in forecasts and climatological records for several reasons. A trace of snow is sometimes referred to as a "dusting". įor frozen precipitation, a trace can indicate a very light accumulation, or it can indicate a larger amount of snowfall, ice pellets (called "sleet" in the United States), or other frozen precipitation that is continuously melting as it hits the ground. A trace measurement is not usually considered equivalent to any numerical value, and so adding together several trace amounts (for example, when computing monthly totals) will still be considered equal to a trace in most cases.
Ī trace is usually indicated by a capital letter "T" or the word "trace" in place of a numerical amount of accumulation. If less than a measurable amount is present on the ground, or if less than half of the ground is covered with snow (regardless of that snow's depth), this can be denoted by a trace. The second is in the context of snowpack depth, or the amount of snow on the ground at a given time. This can be as little as just a few raindrops or snowflakes, or be enough to wet or coat the ground, but will not be enough to register via standard measurements with a rain gauge or other measuring device.
The first is in weather forecasting and record-keeping of rain, snow, and other precipitation, where a trace denotes an amount of precipitation that is greater than zero, but is too small to be measured by standard units or methods of measurement. The term "trace" is used in two different but related contexts.
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