Aviation abbreviation

PROB40

PROB40 stands for “probability 40 percent” (METAR usage). Got a NOTAM full of contractions? Paste it into the decoder.

Related abbreviations

PRPRBLPRBLTYPRBOPRCFPRCHTPRCTNPRECDPREFPRESPRESFRPRESRR

Source: FAA Order JO 7340.2 Contractions. Not for operational use.