Extensive mountain obscuration. However, if the total area to be affected during the forecast period is very large, it could be that only a small portion of this total area would be affected at any one time. About Winds Aloft Winds aloft are computer prepared and contain forecast wind direction and speed as well at forecast temperatures. 6,000 feet 9,000 feet 12,000 feet 18,000 feet 24,000 feet 30,000 feet 34,000 feet 39,000 feet All heights are above Mean Sea Level. Forecast winds are also prepared for 3,000 feet.
Wind directions are true directions.
Temperatures are negative above 24,000 feet. This is the heading for the actual wind and temperature forecast data. FT indicates the forecast location with following numbers indicating the forecast levels in feet. The 3,000 foot wind is forecast to be 240 degrees at 26 knots. Temperatures are assumed to be negative above 24,000 feet.