Day 24 of the Perdigao IOP. Today was another hot day, with mostly clear skies and calm to light winds. A few thin, high clouds were visible through much of the day, with isolated towering Cu forming after 1500. Thunderstorms formed late in the day well to the S of Perdigao, and slowly moved north towards the area. A weakly organized MCS finally reached the area around 0000, with frequent lightning. The storm persisted in the area until at least 0100. Due to the lightning, the 00 UTC 25 May 2017 sonde was scrubbed.

As a result, only three sondes were launched today, at 06 UTC, 12 UTC & 18 UTC, with no issues.