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Height of xx dBZ Echo Above x°C

Height of xx dBZ Echo Above x°C

Short Description

The altitude difference (thickness) between a specified echo top (ET) and a specified temperature.

Subproducts

Height of 50 dBZ Echo Above -20°C

Height of 60 dBZ Echo Above -20°C

Height of 50 dBZ Echo Above 0°C

Height of 60 dBZ Echo Above 0°C

Primary Users

NWS WFO

Input Sources

3D Reflectivity Cube

Vertical temperature profile from the current operational NCEP/EMC mesoscale model (i.e., the RAP as of 2014).

Resolution

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 horizontal 2D grid point, the altitude of the specified temperature value (e.g., 0°C) is checked from the top-down. Once the temperature value becomes greater than the temperature being searched for, the altitude is computed by interpolating between the current level and the previous higher level. This calculation method accounts for low-level inversions in the temperature profile by specifically targeting altitudes that are associated with deep convection (e.g., elevated convection over shallow cold layers).

The reflectivity thickness is computed by subtracting the temperature level altitude from the xx dBZ Echo Top altitude.

Technical Details

References

Cavanaugh, D. E., and J. A. Schultz, 2012: WSR-88D signatures associated with one inch hail in the Southern Plains. Electronic J. Operational Meteor, 13 (1), 1-14.

Donavon, R. A., and K. A. Jungbluth, 2007: Evaluation of a technique for radar identification of large hail across the Upper Midwest and Central Plains of the United States. Wea. Forecasting, 22, 244-254.