Aviation abbreviation

PIWI

PIWI stands for “no pilot balloon observation due to high, or gusty, surface wind” (Weather usage). Got a NOTAM full of contractions? Paste it into the decoder.

Related abbreviations

PIBPIBALPICPIRPIREPPIRFCPISEPISOPIT

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