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AIM

10/12/17

7−1−53

Meteorology

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).