If the wind is from true north at 8 knots and the magnetic declination is plus 10 degrees, how would this be coded?

To determine the correct coding for the wind direction given true north conditions, it's important to understand how true north and magnetic declination interact. In this case, the wind is blowing from true north at 8 knots.

True north is indicated as 360 degrees. The magnetic declination adds 10 degrees which is used mainly in navigation to convert true headings to magnetic headings; however, in meteorological context, wind is reported based on true direction. Therefore, the wind direction remains at 360 degrees to indicate it is coming from true north.

We express wind speed in knots, so the 8 knots is simply appended to the wind direction value in the format typically used, which is degrees and then speed (KT for knots).

Thus, when coding this, the full representation would be 36008KT, meaning the wind is coming from 360 degrees at a speed of 8 knots. This aligns perfectly with the hourly format used in aviation and meteorological reports.