Instrument Flight Rules (IFR) Practice Exam 2025 – The All-in-One Guide to Master Your IFR Certification!

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What does the entry 9900+00 indicate in a Winds and Temperatures Aloft Forecast?

Light and variable; less than 5 knots

The entry "9900+00" in a Winds and Temperatures Aloft Forecast signifies light and variable winds that are less than 5 knots. In the format of these forecasts, the first two digits represent the wind direction, the next two digits indicate the wind speed, and the "+" symbol denotes that the temperature is above zero degrees Celsius.

The "99" indicates a variable direction, which is also specifically interpreted as light winds. The "00" means that the wind speed is less than 5 knots, which falls into the category of being qualified as light and variable. Understanding this format is crucial for pilots to interpret wind conditions accurately for safe flight planning and operation.

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Vortex winds exceeding 200 knots

Light and variable; less than 10 knots

Winds from the east at 10 knots

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