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Aeronautical Information Manual (AIM), page 497

Index   496 -- Page 497 -- 498

5/26/16


FIG 7-1-17
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 7-1-17 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 7-1-53

Page 497 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   496 -- Page 497 -- 498