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VIL Density

VIL Density

Short Description

Vertically Integrated Liquid (VIL) divided by the depth of the column



Primary Users


Input Sources

Vertically Integrated Liquid (VIL)

18 dBZ Echo Top


Spatial Resolution: 0.01o Latitude (~1.11 km) x 0.01o Longitude (~1.01 km at 25oN and 0.73 km at 49oN)

Temporal Resolution: 2 minutes

Product Creation

At each 2D horizontal grid point, the VILD is computed by dividing the VIL value by the height of the 18 dBZ Echo Top (ET) using (Amburn and Wolf 1997):

Technical Details

Latest Update: MRMS Version 11.5


Amburn, S. A., and P. L. Wolf, 1997: VIL density as a hail indicator. Wea. Forecasting, 12, 473-478.

Greene, D.R., and R.A. Clark, 1972: Vertically integrated liquid water-A new analysis tool. Mon. Wea. Rev., 100, 548-552.

Troutman, T. W. and M. Rose, 1997: An examination of VIL and echo top associated with large hail in Middle Tennessee. NWS Southern Region Technical Attachment SR/SSD 97-15. Fort Worth, TX.