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The snow melts into rain then refreezes just as it hits the cold ground. Since the rain is not freezing until it reaches the surface, it still falls like regular rain and therefore looks and feels ...
The Weather Channel's definition may include precipitation amounts below 0.01 inch (0.254 mm) and includes the chance of precipitation 3 hours before or after the forecast period. This latter change was described as less objective and more consumer-centric. [ 5 ]
[1] [2] [3] The Weather Channel has been empirically shown, and has also admitted, to having a wet bias in the case of low probability of precipitation (for instance, a 5% probability may be reported as a 20% probability) but not at high probabilities of precipitation (so a 60% probability will be reported as a 60% probability). Some local ...
Cornish said the concept is plain and simple: "It is the probability that at least 0.01 of an inch of precipitation will fall on your rooftop if you live in the forecast area.
The Quantitative Precipitation Forecast (abbreviated QPF) is the expected amount of liquid precipitation accumulated over a specified time over a specified area. [115] A QPF will be specified when a measurable precipitation type reaching a minimum threshold is forecast for any hour during a QPF valid period.
Within the United States, the Hydrometeorological Prediction Center, [20] River Forecast Centers, [1] and local forecast offices within the National Weather Service create precipitation forecasts for up to five days in the future, [21] forecasting amounts equal to or greater than 0.01 inches (0.25 mm). Starting in the mid-to-late 1990s, QPFs ...
A low pressure system developing across the upper Midwest and Great Lakes was forecast to bring freezing rain to some areas Sunday and Monday, and winter weather advisories were in effect ...
The term "trace" is used in two different but related contexts. 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.