Page 100 - AFMAN 15-111, 12 MAR 2019

90 AFMAN15-111 12 MARCH 2019

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

3 Augmented or (AO2 or AO2A). Encode AO2 in all METAR/SPECI from X X X

Automated FBWOSs without augmentation. Encode AO2A in all
Systems METAR/SPECI from FBWOSs with manual augmentation.
Note: ASOS/AWOS stations without a precipitation
discriminator will report AO1; ASOS/AWOS stations with a

precipitation discriminator will report AO2.
4 Peak Wind Encode peak wind (> 25 knots) in format, X X X
PK_WND_dddff(f)/(hh)mm of the next METAR, where

PK_WND is the remark identifier, ddd is the direction of the
peak wind, ff(f) is the peak wind speed since the last
METAR, and (hh)mm is the time of occurrence (only the

minutes are required if the hour can be inferred from the
report time). There will be a space between the two elements
of the remark identifier and the wind direction/speed group; a
slash "/" (without spaces) will separate the wind
direction/speed group and the time. This remark is still

required even if the peak wind speed was transmitted in an
intervening SPECI, but is not required if the peak wind
occurred and/or reoccurred during the 2-minute observation
period prior to the METAR. For example, a peak wind of 45

knots from 280 degrees that occurred at 15 minutes past the
hour would be encoded "PK WND 28045/15." Multiple
occurrence example: PK WND 24042/43 25042/19
(augmented mode). Note: FBWOS report the most recent
occurrence of the peak wind.

5 Wind Shift Encode wind shift ( 45 in less than 15 minutes with sustained X X X
winds 10 kts) in format, WSHFT_(hh)mm, where WSHFT