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AIM

10/12/17

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).