Temporary changes expected between 2000Z and 2200Z . There is a 40 percent probability of this condition occurring between 0400Z and 0700Z . FM1000 FROM 1000Z . Conditions Becoming as described between 1300Z and 1500Z . Once the specific time periods can be discerned, the sequence of wind, visibility, significant weather, cloud cover and cloud height follows and is repeated for each time block.
Some key differences follow.
In the United States, we use prevailing visibility, in statute miles, not the lowest visibility, so the same conditions would be reported differently. Also, there must be no other significant weather. NSC means no significant clouds. International TAFs may include temperature, turbulence, and icing forecasts. NSW No Significant Weather.