Page 103 - AFMAN 15-111, 12 MAR 2019

AFMAN15-111 12 MARCH 2019 91

Observed Enter in Remarks Section Manual Automated Supplement Back-up
Condition
Remark
Number

is the remark identifier and (hh)mm is the time the wind shift
began. When augmenting, the contraction FROPA may be

manually entered by the weather personnel following the
time if it is reasonably certain that the wind shift was the
result of a frontal passage. There is a space between the

remark identifier and the time and, if applicable, between the
time and the frontal passage contraction. For example, a
remark reporting a wind shift accompanied by a frontal
passage that began at 30 minutes after the hour would be
encoded as "WSHFT 30 FROPA."

6 Tower Encode tower visibility as, TWR_VIS_vvvvv where vvvvv X M X X
Visibility is the observed tower visibility value when surface and/or
tower visibility are less than 4SM (6000 m) and the control

tower reported visibility differs from the surface prevailing
visibility by a reportable value. There is a space between
each of the remark elements. For example, if the surface
visibility is 2 statute mile (3200 m) and tower visibility is
1½SM (2400 m), you would encode TWR VIS 1½ (TWR

VIS 2400). Continue to carry the last reported tower
visibility in subsequent METAR or SPECI observations
unless otherwise notified by the control tower.

7 Variable Encode variable prevailing visibility (visibility < 3SM (4800 X X X
Prevailing m) increases/decreases by ½SM (800 m) during observation)
Visibility in format VIS_vnvnvnvnvnVvxvxvxvxvx, where VIS is the
remark identifier, vnvnvnvnvn is the lowest visibility
evaluated, V denotes variability between two values, and

vxvxvxvxvx is the highest visibility evaluated. There is one
space following the remark identifier; no spaces between the