The IWXXM QVA information shall include feature information for four ash concentration thresholds (≥0.2mg/m3, ≥2.0mg/m3, ≥5.0mg/m3, ≥10mg/m3) in accordance with the QVA IWXXM schema. The probabilistic QVA information shall include the probability of exceeding four ash concentration thresholds (≥0.2mg/m3, ≥2.0mg/m3, ≥5.0mg/m3, ≥10mg/m3) at a 0.25 degree horizontal resolution and for 12 vertical levels in accordance with the NetCDF4 specification for gridded data. The deterministic QVA information shall include an expected ash concentration for each grid point at a 0.25 degree horizontal resolution and for 12 vertical levels in accordance with the NetCDF4 specification for gridded data. All information types shall be provided for the period 0-hours to 24-hours at 3-hourly intervals. Note: the QVA IWXXM schema is expected to be included in the 2025-2 IWXXM release.
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