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AIM 

6/17/21 

FIG 7

1

17 

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

18 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, Air Traffic Control, Low Level Wind 
Shear/Microburst Advisories, Paragraph 3

1

8b2(a). 

Meteorology 

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