GRAMET

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Chart Legend

Clouds
Low clouds (below FL65)
Mid clouds (FL65–FL200)
High clouds (above FL200)
CB (convective)
Temperature
Isotherms (10°C intervals)
0°C isotherm
-8°C Temperature labels
Wind
Wind barbs (kt)
Isotachs (25 kt intervals)
Sky coverage (WMO oktas)
0 Clear
1
2
3
4 Half
5
6
7
8 Overcast
Icing
Moderate (IENG ≥ 30)
Severe (IENG ≥ 80)
Turbulence
Moderate (E 80–160)
Severe (E ≥ 160)
Thunderstorms
⚡ Unlikely (LI −0.5 to −3.5)
⚡ Possible (LI −3.5 to −5.5)
⚡ Probable (LI −5.5 to −6.5)
⚡ Severe (LI −6.5 to −8)
⚡ Violent (LI < −8)
Precipitation
Rain (below 0°C level)
❄ Snow (above 0°C level)
Terrain
Centerline elevation
Max elev. within ±5 NM
Atmosphere
Tropopause
Daytime sky
Night
Flight
Cruise flight level
Documentation
Data Status
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GRAMET cross-section