D.7.7 Ribbon Display Alert Messages
33–A MBA 3MF 40K– 180 14
Approach/Departure Corridor
Type of Alert (Microburst or Wind Shear)
Location (e,g, 3 miles final approach)
Expected airspeed gain/loss
Wind direction at threshold or other specified location
Figure 124 TDWR Ribbon Display Alert Messages
D.8 TDWR/LLWAS Integrator and
Runways Utility
The TDWR/LLWAS Integrator is a separate software process (that is not part of the main
IRIS software) which combines wind shear alerts from IRIS and an optional LLWAS system to
generate TDWR products. The Integrator functions as a filter on the alerts, that is, the
integrator:
• Only passes alerts for runways that are active as specified by the runways utility.
• If an arena has 2 or more alerts, then the more important alert is passed, for example, a
microburst alert is more important than a wind shear alert.
• Only passes the alert for the arena of first encounter in a corridor. For example, if
33L_3MF and 33L_2MF both have microbursts alerts, then the 33L_3MF is alerted on
the ribbon display since an aircraft would encounter this first.
• In the event of failure of a system, the failed system uses the alerts from the other
system, for example, if TDWR fails, then only LLWAS data is used.
• For each arena, the alerts from TDWR and LLWAS are combined as follows: a strong
alert (MBA) from either system is passed through, while a weak alert (WSA) requires
confirmation from the other system. The thresholds for what is considered strong and
weak are tuned for each site.
The TDWR products from the Integrator are sent back to IRIS for distribution to SD's to drive
the ribbon displays. See Data Flow for Ribbon Display Generation (page 337).
The Integrator takes as input the following data:
• SLINE products from IRIS (gust front warning)
• WARN (on radial shear) products from IRIS (microburst warning)
• LLWAS input data (if available, for LLWAS warnings).
• Active runway configuration from the runways utility.
A new TDWR product is made and output to IRIS when:
• New input data are received.
• The active runway configuration is changed.
• A maximum time-out has expired (specified time of order 60 seconds).
• The product sitename is the same as the radar sitename.
Appendix D – IRIS TDWR Features
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