Day 21 of the Perdigao IOP. Today was warm with mostly clear skies through mid-afternoon, then mostly clear skies with haze (perhaps dust from N Africa, as was forecast). Surface winds were mostly weak and southerly.

Four sondes were launched today, at 00 UTC, 06 UTC, 12 UTC & 18 UTC, with no issues. The potential supersonde schedule was scrubbed for today, but is being discussed for tomorrow.