What FAA sources of weather information can pilots use to mitigate the risk of flying in icing conditions?
Here's a list of official FAA weather information sources that pilots can analyze to avoid or mitigate icing risks:

AIRMET Zulu

An AIRMET Zulu will be issued for areas where icing conditions are forecast to be light or moderate.

SIGMET

A SIGMET will be issued for icing conditions forecast to be severe.

PIREPs

PIREPs are the best source of icing information. Unlike weather information sources which are forecasts, PIREPs are reports from pilots flying in the actual conditions and should be considered the most accurate source of icing information.

Here's an example of a PIREP where a pilot of a TBM-700 was descending into Atlanta. He reported a cloud layer topping at 7900 feet down to 500 feet AGL and picking up light rime ice between 7900 and 5000 feet.

UA /OV ATL /TM 1200 /FLUNKN /TP TBM7 /SK OVC015-TOP079 /IC LGT RIME 050-079 /RM DURD


Significant Weather Prognostic Charts

The top two panes of a prog chart help pilots visualize the freezing level. A zig zag line shows when freezing level is at the surface and height contours for the highest freezing level are drawn at 4000 foot intervals with dashed lines. This information gives pilots a forecast of temperatures which when combined with known precipitation can predict ice and help to avoid it.



Area Forecast (FA)

An FA is an additional source of information about where cloud tops and bottoms are. If you know that along with the freezing level you can get a better idea of where icing conditions are most likely.