Optimistic Outlook: Understanding Wind Directions and Speeds Aloft Forecast

What does the entry "9900 00" represent in a Winds and Temperatures Aloft forecast (FB)?

How is wind direction and speed interpreted at 9,000 feet based on the entry "9900 00"?

Answer:

The entry "9900 00" on a Winds and Temperatures Aloft forecast (FB) represents a wind direction of 90 degrees and a wind speed of 0 knots at 9,000 feet.

In aviation, understanding wind directions and speeds at different altitudes is crucial for safe flight operations. The entry "9900 00" in a Winds and Temperatures Aloft forecast (FB) provides specific information about the atmospheric conditions at 9,000 feet above ground level.

The entry "9900 00" breaks down as follows:

• dd: The first two digits "99" indicate the wind direction in tens of degrees. In this case, it is 90 degrees, signifying an eastward wind.
• ff: The next two digits "00" represent the wind speed, which is 0 knots at this altitude.

Therefore, pilots and meteorologists can infer from the entry "9900 00" that at 9,000 feet, the wind is calm with no speed (0 knots) coming from the east (90 degrees). This information is valuable for flight planning and navigation.