Geoscience Reference
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Figure 4.10. Idealized model of the WER, BWER, and echo overhang in a supercell. (Top)
Horizontal cross section of color-coded radar reflectivity factor, with warm colors the most
reflective and cool colors the least at low levels; mid-level echo is outlined by dotted line.
(bottom) Vertical cross section across the line A-B at the top (from the National Weather
Service Storm Spotter Glossary).
where Z
H
and Z
V
are the radar reflectivity factors of horizontally and vertically
polarized radar beams (it is assumed here that the horizontally polarized outgoing
beam is received by the horizontally polarized antenna and that the vertically
polarized outgoing beam is received by the vertically polarized antenna). There is
a column of relatively high values of Z
DR
(called a ''Z
DR
column'') at locations
displaced from the center of the updraft, which is thought to be associated with
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