2.1.2 — You must look at the METAR (Meteorological Aerodrome Report) to determine the Headwind or Tailwind Component (H/TWC) for a particular runway. You should also look at the TAF (Terminal Aerodrome Forecast), which will provide a trend of the expected wind over the coming hours. Controllers should avoid switching runways as much as possible as this creates delays. Most aircraft can land with a TWC of up to 10kts. Therefore, runway changes should be avoided until this point if at all possible.
If the airport is showing no METAR information, what do you do then?
One way to check which way the wind is blowing is by publishing ATIS. It will output the “estimated” winds within the ATIS message.
estimated winds 270 at 12
It’s better then nothing. The estimated winds should be an accurate representation of what the current conditions are at the airport, allowing you to more confidently choose the appropriate runways to use.
The weather information not showing can happen from infrequently. It will resolve on its own with no action from you. It can be caused by any number of things. The system could be updating or even the third-party METAR reporting service being used could have a glitch.