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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]
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 ...
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.
Precipitable water is the depth of water in a column of the atmosphere, if all the water in that column were precipitated as rain. As a depth, the precipitable water is measured in millimeters or inches. Often abbreviated as "TPW", for Total Precipitable Water.
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.
There will be pockets where 12 inches and locally higher amounts of snow can pile up in northern and western Michigan. Not all of the snow will be confined to the Great Lakes region on Friday.
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.
This will allow for mainly rain to spread across much of the mid-Atlantic region. But farther north, the cooler air seeping southward from Canada will result in areas of snow as this midweek storm ...