Cumulonimbus (CB) and Cumulus congestus (Towering Cumulus: TCU) | |
---|---|
ISOL: | Separate CB or TCU with maximum spatial coverage less than 50% of the area concerned. |
OCNL: | Occasional CB or TCU with maximum spatial coverage of between 50 and 75% of the area concerned. |
FRQ: | Frequent CB or TCU with maximum spatial coverage greater than 75% of the area concerned. |
EMBD: | CB (and not TCU) drowned in the cloud mass. |
LYR is used when two or more stratiform cloud types occur at different levels between the base and top of the layer being described.
Rain | Continuous precipitation |
Drizzle | Light precipitation |
Rain freezing | Freezing on contact |
Snow | Frozen precipitation |
Showers | Intermittent precipitation |
Hail | Ice pellets |
Freezing fog | Fog below 0°C |
Moderate/Heavy icing | Ice accumulation |
Haze | Reduced visibility |
Widespread fog | Extended fog area |
Thunderstorms | Convective activity |
Turbulence | Moderate/Strong |
Mountain obscuration | Darkening of mountains |
COT | On the coast |
LAN | Inland |
LOC | Locally |
MAR | At sea |
MON | Above the Mountains |
SFC | On the surface |
VAL | In the valleys |