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I know that BLU is military code and means "Ceiling at or above 2,500 feet; Visibility at or above 8,000 meters".

ETSH 241320Z 19007KT 9999 SCT048 SCT160 BKN200 08/03 Q1008 BLU+

ETSH 241220Z 20005KT 9999 FEW050 SCT160 BKN240 08/03 Q1009 BLU+

But what does + at the end signify?

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Per the German Meteorological Service, the + means a ceiling 20,000 feet or higher.

BLU: visibility>=8000m, ceiling 2500 - <20000 ft

BLU+: visibility>=8000m, ceiling >=20000 ft

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