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Aviation Weather Handbook

FAA-H-8083-28B Version 2026

Chapter 27

Forecasts

When more than one type of precipitation is forecast in a time period, any precipitation type associated with a descriptor (e.g., FZRA) is encoded first in the precipitation group, regardless of the predominance or intensity of the other precipitation types. Descriptors are not encoded with the second or third precipitation type in the group. The intensity is associated with the first precipitation type of a multiple precipitation type group. For example, a forecast of moderate snow and light freezing rain is coded as -FZRASN, although the intensity of the snow is greater than the freezing rain.

Examples:

Combinations of one precipitation and one non-precipitation weather phenomenon:

• -DZ FG

Light drizzle and fog (obstruction that reduces visibility to less than 5/8 SM).

• RA BR

Moderate rain and mist.

• -SHRA FG

Light rain showers and fog.

• +SN FG

Heavy snow and fog.

Combinations of more than one type of precipitation:

• -RASN FG HZ

Light rain and snow (light rain predominant), fog, and haze.

• TSSNRA

Thunderstorm with moderate snow and rain (moderate snow predominant).

• FZRASNPL

Moderate freezing rain, snow, and ice pellets (freezing rain mentioned first due to the descriptor, followed by other precipitation types in order of predominance).

• SHSNPL

Moderate snow showers and ice pellets.