The 'qva_probabilistic' collection forecasts the likelihood of ash concentration exceeding four set thresholds in mg/m3: ≥0.2, ≥2.0, ≥5.0 and ≥10.0. It includes four separate datasets (one per threshold).
Datasets are provided for twelve vertical slices of the atmosphere between the ground and 60,000ft (Flight level 600), each 5000ft thick.
Payloads are in netCDF format.