Figure 37 HAIL Warning/Centroid
1 Threshold the input product (45 dBZ TOPS in the example) so that only points greater
than the threshold are considered (for example, >>5.5 km (3.4 mi)).
The result is a 2-D binary array.
2 Smooth and connect the regions that are almost touching, and eliminate any isolated
bins.
3 Contiguous regions are identified by a region finder procedure.
The centroid location and area of each region is computed.
Regions below the threshold size are discarded.
4 Determine whether any part of any region is in a protected area.
If so, a warning message and audio beep are broadcast to all IRIS terminals.
5 Produce the WARN, a situation display, also called an overlay display because it can be
overlaid on any X-Y product display as selected in the Product Output menu.
For example, a HAIL warning display can be overlaid on a display of PPI reflectivity to
show the relationship between the warning and the current weather.
Warning Message
You can define the content of the message. For example:
2 HAIL Warnings at 11:30:00 in: AREA_A AREA_B
In this case, HAIL is the user-selected warning text and AREA_A is the user-selected name
of the protected area.
The names and locations of protected areas are defined in the IRIS Setup utility.
The messages are added to the IRIS Message Summary menu.
Chapter 3 – Configuring IRIS Products
RESTRICTED 101
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