Intensity is coded first using contractions TRACE, light (LGT), moderate (MOD), or severe (SEV). Reports of a range or variation of intensity is separated with a hyphen. If icing was forecast but not encountered, negative (NEG) is coded. Icing type is reported second. Reportable types are RIME, clear (CLR), or mixed (MX).

The AIM, Chapter 7, Section 1, Meteorology provides classification of icing intensity, according to its operational effects on aircraft, as well as tables of icing types and icing conditions.

The reported icing/altitude is coded last, and only if different from the value reported in the altitude/flight level (/FL) group. A hyphen is used to separate reported layers of icing. Above (ABV) or below (BLO) is coded when a layer is not defined.

Pilot reports of icing should also include air temperature (/TA).

Examples:

/IC LGT-MOD MX 085 Light to moderate mixed icing, 8,500 ft MSL.

/IC LGT RIME Light rime icing.

/IC MOD RIME BLO 095 Moderate rime icing below 9,500 ft MSL.

/IC SEV CLR 035-062 Severe clear icing 3,500 to 6,200 ft MSL.

The remarks (/RM) group is used to report a phenomenon that is considered important but does not fit in any of the other groups. This includes, but is not limited to, LLWS reports, thunderstorm lines, coverage and movement, lightning, SO gas smell, clouds observed but not encountered, and geographical or local descriptions of where the phenomenon occurred. Hazardous weather is reported first. LLWS is described to the extent possible.

Fluctuations in wind speed 10 kt or more (±10 kt), within 2,000 ft of the surface, are issued as an Urgent (UUA) PIREP. When LLWS is entered in a PIREP, LLWS is entered as the first remark in the remarks (/RM) group.

Example:

/RM LLWS +/-15 KT SFC-008 DURC RY22 JFK Remarks, LLWS, air speed fluctuations

FUNNEL CLOUD, TORNADO, WATERSPOUT, and DUST/SAND WHIRLS are entered with the direction of movement, when reported.

Example:

/RM TORNADO W MOV E Remarks, tornado west moving east.