AIM

8/15/19

7

−

1

−

55

Meteorology

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).