Section 3. Wind and Temperature Aloft Forecast (FB)

1. GENERAL

Wind and temperature aloft forecasts (FB) are computer-prepared and issued by the National Centers for Environmental Prediction (NCEP) at Suitland, Maryland. The forecasts are valid 6, 12, and 24 hours after the observation date/times of 0000Z, 0600Z, 1200Z, and 1800Z based on National Weather Service Instruction 10-812, Aviation Wind and Temperature Aloft Forecasts. See TBL 8-3-1 for wind/temperature aloft forecast schedules.

1. LEVELS FORECAST

Dependent upon station elevation, wind forecasts are issued for the following levels: 3, 6, 9, 12, 18, 24, 30, 34, and 39 thousand foot levels. The first level for which a wind forecast is issued is 1,500 feet or more above the station elevation. Temperature is forecast for all wind levels that are 2,500 feet or more above the station. No temperature is forecast for the 3,000 foot level. The minus signs are deleted preceding the temperatures at the 30, 34, 39, 45, and 53 thousand foot levels.

1. DISTRIBUTION

All FBs are transmitted to the WMSCR by NCEP. Distribution by the WMSCR is accomplished in accordance with established program requirements.