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AIM 

6/17/21 

FIG 7

1

19 

Gust Front Alert 

(c)  MULTIPLE WIND SHEAR ALERTS 

EXAMPLE

 

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

27A WSA 20K+ RWY  250 20 

27D WSA 20K+ RWY  250 20 

NOTE

 

(See FIG 7

1

19 to see how the TDWR/WSP determines 

the gust front/wind shear location.) 

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

PHRASEOLOGY

 

MULTIPLE WIND SHEAR ALERTS. RUNWAY 27 
ARRIVAL, WIND SHEAR ALERT, 20 KT GAIN ON 
RUNWAY; RUNWAY 27 DEPARTURE, WIND SHEAR 
ALERT, 20 KT GAIN ON RUNWAY, WIND 250 AT 20. 

EXAMPLE

 

In this example, the controller is advising arriving and 
departing aircraft that they could encounter a wind shear 
condition right on the runway due to a gust front 
(significant change of wind direction) with the possibility 
of a 20 knot gain in airspeed associated with the gust front. 
Additionally, the airport surface winds (for the runway in 
use) are reported as 250 degrees at 20 knots. 

REFERENCE

 

FAA Order 7110.65, Air Traffic Control, Low Level Wind 
Shear/Microburst Advisories, Paragraph 3

1

8b2(d). 

Meteorology 

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