Situation Display
The contents of the situation displays are as follows:
• Outlines of active protected areas.
• Warning text at each centroid location which exceeds threshold size (such as, HAIL or
MBW).
• A warning message.
The following figure shows an example of a microburst warning (MBW) based on the optional
radial shear product. A warning display can also be transmitted with a selectable
geopolitical overlay.
Figure 38 Example of Warning Situation Display
The outlines of the protected areas are shown for the areas included in the WARN product.
In the example, the runway outlines are from a separate overlay map which is merged with
the product when it is displayed.
The warning text (MBW in the example) is displayed at the centroid location of the weather
phenomenon that has been detected. If a weather phenomenon has been detected in a
protected area, the warning message is displayed in large characters across the bottom of
the screen. The time associated with each warning is also displayed. If more than one hit is
detected in a protected area, then the number of hits is displayed. A legend on the right of
the display summarizes the characteristics of the product. This includes the product ID, date,
data time and a summary of the product configuration parameters.
Warning Criteria
The automatic warning feature can provide alerts for a wide variety of weather phenomena,
such as the approach of a severe storm, turbulence, lightning hazard, or flood potential.
Up to 3 criteria can be used. The thresholding and smoothing is performed separately for
each, then the results are ANDed together so that centroid definition is performed on the
combined field. For example, the additional criterion of the 1 ... 10 km (0.6 ... 6.2 mi) VIL
>>5 mm (0.2 in) could be added to reduce a HAIL warning false alarm rate.
IRIS Product and Display User Guide M211319EN-H
102 RESTRICTED
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