FM131800 From the 13th day of the month at 1800 UTC.

VRB03KT Wind variable at 3 kt.

P6SM Visibility greater than 6 SM.

SCT025 BKN250 2,500 ft scattered, ceiling 25,000 ft broken.

TEMPO 1320/1324 Temporary conditions between the 13th day of the month at 2000 UTC and the 14th day of the month at 0000 UTC.

1SM Visibility 1 SM.

TSRA Thunderstorms with moderate rain showers.

OVC010CB Ceiling 1,000 ft overcast with cumulonimbus.

FM140000 From the 14th day of the month at 0000 UTC.

VRB03KT Variable wind at 3 kt.

P6SM Visibility greater than 6 SM.

VCTS Thunderstorms in the vicinity.

SCT020CB BKN120 2,000 ft scattered with cumulonimbus, ceiling 12,000 ft broken.

TEMPO 1408/1412 Temporary conditions between the 14th day of the month at 0800 UTC and the 14th day of the month at 1200 UTC.

BKN020CB Ceiling 2,000 ft broken with cumulonimbus.

Scheduled TAFs prepared by NWS offices are issued at least four times a day, every six hours. Some locations have amendments routinely issued three hours after the initial issuance. The issuance schedule is shown in Table 27-7.The issuance of a new TAF cancels any previous TAF for the same location.

The NWS forecaster must have certain information for the preparation and scheduled issuance of each individual TAF. Although integral to the TAF writing process, a complete surface (METAR/SPECI) observation is not needed. Forecasters use the “total observation concept” to write TAFs with data including nearby surface observations, radar, satellite, radiosonde, model data, aircraft, and other sources.