| Code
| Phenomenon and Content
|
| SFC WSPD
| Surface wind speed
Mean wind speed
widespread > 30 KT (60 KPH).
|
| SFC VIS
| Surface visibility
Visibility widespread < 5000m
Additionally: weather phenomena which are reducing visibility in METAR code.
|
| TS GR or TS
| Thunderstorm with or without hail
Isolated/occasional thunderstorm with/without hail (ISOL,OCNL):
ISOL TS, ISOL TSGR, OCNL TS,
OCNL TSGR.
|
| MT OBSC
| Mountain obscuration
Altitude (ft MSL) from which mountains are completely or partially in clouds.
|
| CLD
BKN/OVC CLD
| Cloud
Broken/overcast cloud
Broken and overcast clouds widespread lower than 1000ft (300 m) with base and top above ground level.
The cloud base and cloud top are given with units of measurement.
|
| Cb and TCU
ISOL/OCNL/FRQ
| Cb without thunderstorm and TCU (Towering Cumulus)
Isolated/occasional/frequent
ISOL means sky coverage < 50%
OCNL means sky coverage from 50% to
75 %
FRQ means sky coverage > 75%.
|
Table 6. End
| Code
| Phenomenon and Content
|
| MOD ICE
| Moderate icing
Moderate icing not in convective clouds with details of altitude layer; it is not given with valid SIGMET on severe icing.
|
| MOD TURB
| Moderate turbulence
Moderate turbulence (not in convective clouds) with details of altitude layer; not given in valid SIGMET on severe mountain waves.
|
| MOD MTW
| Moderate mountain waves
Moderate mountaine waves with details of altitude layer;
not given in valid SIGMET on severe mountain waves.
|
General airmet format is given in Table 7.
Table 7
