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The scale of dBZ values can be seen along the bottom of the image. dBZ is a logarithmic dimensionless technical unit used in radar.It is mostly used in weather radar, to compare the equivalent reflectivity factor (Z) of a remote object (in mm 6 per m 3) to the return of a droplet of rain with a diameter of 1 mm (1 mm 6 per m 3). [1]
Snowfall rates play an important role in winter storm forecasts. Here's a look at some extreme examples from the past that illustrate how much can fall in an hour.
In areas where imperial units are used (primarily the United States), liquid precipitation (rain and drizzle) is measured in intervals of 0.01 inches (0.25 mm), while snow, ice pellets, and most other precipitation types are measured in intervals of 0.1 inches (2.5 mm). [1] Freezing rain is sometimes measured in intervals of 0.1 inches (2.5 mm ...
Heavy rain describes rainfall with a precipitation rate above 7.6 millimetres (0.30 in) per hour, and violent rain has a rate more than 50 millimetres (2.0 in) per hour. [11] Snowfall intensity is classified in terms of visibility instead. When the visibility is over 1 kilometre (0.62 mi), snow is determined to be light.
As the storm moves along, a widespread 1 to 3 inches of snow will fall. Snow is likely to be persistent enough in the West Virginia mountains for upwards of 6 inches of snow in the highest terrain ...
A winter storm has dumped snow along the central and southeastern United States the past few days. Find out how much snow has fallen near you.
Environment Canada reports a chance of precipitation (COP) that is defined as "The chance that measurable precipitation (0.2 mm of rain or 0.2 cm of snow) will fall on any random point of the forecast region during the forecast period." [7] The values are rounded to 10% increments, but are never rounded to 50%. [8]
A “rain-snow mix” is expected, so the exact amounts of snow the area will receive is unknown right now, but the NWS is expecting anywhere from 2 to 5 inches of snow Wednesday night into Friday ...