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in frontal systems and icing from convection are both captured. • The categories relate to an icing intensity 0 = NIL 1 = TRACE 2 = LIGHT 3 = MODERATE 4 = SEVERE NIL TRACE LIGHT MOD SEV • Icing Severity data is provided for the following levels: FL060 (812.0 hPa) FL100 (696.8 hPa) FL140 (595.2 hPa