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4. Turbulence alerts
Page 39 / date / name / ©Vaisala
AviMet Wind Profiler displays
Alert when wind difference between two height levels
exceed pre-set limit
 Important feature for vertical wind shear detection.
 Both the high-low altitude levels and the wind difference amount
are user configurable through password protected UI.
 The wind difference amount is calculated as vector difference.
 Five vertical shear warning layers. These layers can overlap totally
or partially.
 There is a timer for each eventual warning so that a user can set
the warning duration.
Page 40 / date / name / ©Vaisala
AviMet Wind Profiler displays
 Alert for cross-wind and headwind vertical wind shear
separately
Capability to alert user if wind difference between two height
levels exceed pre-set limit
Option to separately alert for cross-wind and headwind
vertical wind shear
 The alert height levels can be set in configuration
 The alert thresholds can be set in configuration
 The alert strings shown in alert displays follow closely the
LLWAS alert displays "runway; windshear type; windshear
strength; windshear height"
Page 41 / date / name / ©Vaisala
AviMet Wind Profiler displays
 Runway: Runway ID and direction
 A: Approach
 D:Departure
 Windshear type:
 VERTICAL WIND SHEAR
 VERTICAL CROSS WIND SHEAR
 VERTICAL HEAD WIND SHEAR
 altitude: The altitude between the lower and higher limits
calculation, used when difference is small
 altitude levels: The lower and higher limits of the shear calculation, used when
the difference is bigger
 windshear strength: Total, head or cross wind shear amount.
 For cross wind shear, L stands for left wind at first level if access (higher in
approach, lower in departure).
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AviMet Wind Profiler displays
 Example: R22A VERTICAL WIND SHEAR 800FT 20KT
Here the wind shear is the total difference vector at 800FT
 Example for cross oriented shear:
R22A VERTICAL CROSS WIND SHEAR 800FT L20KT+
 It should be noted that the shear is reversed for planes
landing or taking off. So for landing aircraft the previous
example becomes:
 Example: R04D VERTICAL CROSS WIND SHEAR 800FT
L20KTPage
43 / date / name / ©Vaisala
AviMet Wind Profiler displays
Alerts on temporal changes on vertical windshear
 An alert can be issued when vertical windshear has a strong temporal
tendency.
 Temporal windshear alerts act as predictive alerts for windshear alerts.
 As the wind profiler normally averages the data for about 10 minutes, that time
interval is also used for temporal change interval.
 The windshear alerts overrides temporal windshear alerts if they are
happening simultaneously.
Page 44 / date / name / ©Vaisala
AviMet Wind Profiler displays
 Turbulence alerts
 As wind profiler is also capable to detect turbulence, alerts for turbulence
layers are created.
 The ICAO turbulence definition is used for classification.
 The ICAO turbulence definition:
 Very low – below 0.05g – Light oscillations
 Low – 0.05 to 0.2g – Choppy; slight, rapid, rhythmic bumps or cobblestoning
 Moderate – 0.2 to 0.5g – Strong intermittent jolts
 Severe – 0.5 to 1.5g – Aircraft handling made difficult
 Very severe – above 1.5g – Increasing handling difficulty, structural damage
possible.
 It should be noted that this classification is approximated, as windprofiler can
not measure turbulence effects for aircraft.
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LLWAS and Wind Profiler
 Main displays
 Standard meteorological windbarb height-time display with
wind speed color coding
 Alert display following the LLWAS alert display format
 Visual alert display with color coding
 Wind shear versus height graph
Page 46 / date / name / ©Vaisala
WP Visual alert display with color
coding
Page 47 / date / name / ©Vaisala
Head/crosswind display
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Combined Alert display, LLWAS integration
Page 49 / date / name / ©Vaisala
Wind barb display, LLWAS integration
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