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Green Line Separater

WSR-88D VAD Wind Profile Image One of the software algorithms within the WSR-88D calculates wind direction and speed at various atmospheric levels. The resulting product is called the Velocity Azimuth Display (VAD) Wind Profile (VWP), shown at left. The x-axis is time in UTC (e.g., 1401 UTC is 1001 am EDT); the y-axis is thousands of ft altitude (e.g., 5 is 5000 ft). Vertical wind shear is crucial to potential thunderstorm organization and severity. The greater the shear, the greater the potential for organized severe weather, assuming storm development. In this figure, radar calculated winds increase substantially in speed (speed shear) and "veer" from east and southeast in low-levels to southwest (directional shear) at mid and upper levels.  This deep-layered strong shear is conducive to severe storms, including supercells and squall lines/bow echoes. Knowledge of environmental wind shear assists forecasters in the warning decision process.

Green Line Separater

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