The levels 18,000 feet and above are pressure altitude.
Wind direction is from true north.
No winds are forecast within 1,500 feet of station elevation. Also, no temperatures are forecast for the 3,000 foot level or for any level within 2,500 feet of station elevation. Temperature is in whole degrees Celsius and assumed to be negative above 24,000 feet. Temperatures are negative above 24,000 feet. 39000 FT indicates the forecast location, the numbers indicate the forecast levels.