Vaisala IRIS, User Manual

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Figure 50 DWELL of PPI for the Previous 2 Hours Showing dBZ
The final figure in the example shows the age of the DWELL data points, that is, the number
of minutes since the most recent PPI product in the sequence. The color scale is configured
so that blue shows the most recent echoes while red shows the oldest echoes.
The example shows blue on the left (West) where the current echo is located. The red
echoes on the right (East) are the older echoes from earlier in the sequence. This is to be
expected for general East to West motion. Residual clutter shows a speckled pattern (for
example, at 50 km (31.1 mi) to the Northeast).
IRIS Product and Display User Guide M211319EN-H
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