A calm or light and variable wind is indicated by 99. FAs are issued 3 times a day by the Aviation Weather Center in Kansas City for each of 6 areas in the contiguous 48 states. The WSFO in Honolulu issues FAs for Hawaii. Each FA consists of a 12 hour forecast plus a 6 hour outlook. All distances except visibility are in nautical miles.
Visibility is in statute miles.
This section is usually several paragraphs. The breakdown may be by states, by well known geographical areas, or in reference to location and movement of a pressure system or front. A categorical outlook, identified by OTLK, is included for each area breakdown. Amendments to the FA are issued as needed. An amended FA is identified by AMD , a corrected FA by COR , and a delayed FA is identified by RTD .