065°(T)/45 kt

095°(T)/45 kt

245°(T)/45 kt

275°(T)/45 kt

Severe turbulence at all altitudes up to the tropopause.

Relatively smooth conditions close to the ground, unless a mountain wave exists, or the mountains are steep-sided and irregular.

Mountain waves, resulting in downdrafts in excess of the climb performance of most turbojet-engined aeroplanes.

Updrafts and downdrafts, turbulence, and wind shear with changes of wind speed and wind direction.

5,6 and 2,3

2,3 and 5,6

4 and 5,6

2,3 and 1

cyclone

funnel-cloud.

dust devil.

tornado.

Cloud-to-Air.

Cloud-to-ground.

cloud-to-cloud.

Intra cloud.

Clear ice accretes mainly on the trailing edges of aircraft parts.

During flight, mixed ice is invisible on white surfaces.

Rime ice covers the fuselage on all sides, preventing detection.

with hoar frost the aerodynamic contour of the aerofoil appears to be unchanged.

Clear for the first 1500 NM or so and then likely for the rest of the cruise.

It is NOT expected to encounter a high concentration at cruising altitude on this route.

At cruising altitude for the last 600 NM before descent.

At cruising altitude for the first 600 NM after initial climb.

A Rough terrain and a clear warm night.

strong winds and rough terrain.

When the ambient pressure is very low.

With katabatic winds.

Ice crystal icing forms at low altitudes and is usually associated with a Cb. It can affect all aircraft.

Ice crystal icing events are still under investigation and cloud avoidance is required.

 Ice crystal icing forms at high altitudes and is usually associated with the anvil of a cb. A high accumulation

ice crystals are not very likely to form ice. Ice crystals need a nucleus to form, which is hardly found at high

2,3 and 1

2,3 and 5,6

4 and 5,6

5,6 and 2,3