AIM

8/15/19

7

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1

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53

Meteorology

FIG 7

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1

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17

Microburst Alert

(b) WIND SHEAR ALERTS

EXAMPLE

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

  27A WSA 20K

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 3MF  200 15

NOTE

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(See FIG 7

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1

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18 to see how the TDWR/WSP determines

the wind shear location).

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

PHRASEOLOGY

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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

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Threshold wind is at pilot’s request or as deemed
appropriate by the controller.

REFERENCE

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

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1

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8b2(a).