18 / 20

What is the meaning of the following weather message?

CNL WS WRNG 1 211130/211330=

  • A
    This message cancels all weather warnings issued on the 21st of January between 11:30 and 13:30 UTC.
  • B
    The first wind shear warning on the 21st of that month with an occasional intensity has a forecast validity from 11:30 until 13:30 UTC.
  • C
    The weather warning with the number 121 concerning a cyclone at low levels has a validity time from 11:30 until 13:30 UTC.
  • D
    The first wind shear warning on the 21st of that month, issued at 11:30 UTC has been cancelled on the same day at 13:30 UTC.

Refer to figure.

ICAO Annex 3
Chapter 7
7.4 Wind shear warnings and alerts

7.4.2 Recommendation.- Wind shear warnings for arriving aircraft and/or departing aircraft should be cancelled when aircraft reports indicate that wind shear no longer exists or, alternatively, after an agreed elapsed time. The criteria for the cancellation of a wind shear warning should be defined locally for each aerodrome, as agreed between the meteorological authority, the appropriate ATS authority and the operators concerned.

Appendix 3

Table A6-3. Template for Wind Shear Warnings

Element Detailed Content Template(s) Examples
Cancellation of wind shear warning Cancellation of wind shear warning referring to its identification CNL WS WRNG (n) n nnnnnn/nnnnnn CNL WS WRNG 1 211230/211330

CNL WS WRNG 1 211130/211330=
=> Wind Shear Warning - sequence number (1), issued at 1130 UTC on the 21st (211130) has been cancelled at 1330 UTC on the same day (211330).

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.