Figure 4. Four-panel display of the KHGX WSR-88D at 2000 UTC 13 July 1999. (a) The Stage I unbiased HDP estimate. (b) The Stage II adjusted radar rainfall estimate with the bias applied. (c) Gauge-Only field showing 1-h rainfall reports. Gauge CBST2 shown had the heaviest rainfall report. (d) Multisensor field. The applied stage II bias is circled toward the bottom.