Forecast Space Cross Section Chart

A new set of forecast space cross section charts for routes to and from Beijing, Shanghai and Fukuoka is now available on AMIDS. The forecast charts are prepared based on Hong Kong Observatory mesoscale numerical weather prediction model data and include the following information along selected flight routes:

1. upper level wind and temperature along major significant way points;
2. contours of isotherm (lines of equal temperature);
3. contours of isotach (lines of equal wind speed);
4. locations of maximum wind; and
5. area of clear air turbulence (for trial).