4/20/23 

AIM 

FIG 7

−

1

−

18 

Microburst Alert 

(b)  WIND SHEAR ALERTS 

EXAMPLE

−

 

This is what the controller sees on his/her ribbon display in the tower cab. 

27A WSA 20K

−

 3MF  200 15 

NOTE

−

 

(See FIG 7

−

1

−

19 to see how the TDWR/WSP determines the wind shear location). 

This is what the controller will say when issuing the alert. 

PHRASEOLOGY

−

 

RUNWAY 27 ARRIVAL, WIND SHEAR ALERT, 20 KT LOSS 3 MILE FINAL, THRESHOLD WIND 200 AT 15. 

In plain language, the controller is advising the aircraft arriving on runway 27 that at about 3 miles out they can 

expect to encounter a wind shear condition that will decrease their airspeed by 20 knots and possibly encounter 

turbulence. Additionally, the airport surface winds for landing runway 27 are reported as 200 degrees at 15 knots. 

NOTE

−

 

Threshold wind is at pilot’s request or as deemed appropriate by the controller. 

REFERENCE

−

 

FAA Order JO 7110.65, Para 3

−

1

−

8, Low Level Wind Shear/Microburst Advisories, Subpara b2(a). 

Meteorology 

7

−

1

−

57