GNSS wet-delay fluctuation parameters (Matérn λ and σ) for the Spanish Mediterranean corridor, 2018–2024, with sealed prediction registers and analysis code

Per-station, per-day estimates of the Matérn parameters of the zenith wet delay fluctuations (inverse correlation time λ, fluctuation amplitude σ) for nine GNSS stations of the Spanish Mediterranean corridor (IGN and ERVA networks, 2018–2024), computed from 30 s PRIDE PPP-AR zenith wet delays in 62.5-minute windows. The dataset supports the paper "GNSS Water-Vapor Fluctuations Announce Mediterranean Convection a Day Ahead" (Kermarrec and Areso Salinas, submitted to Geophysical Research Letters). It includes the rain-gauge day classification used as truth, the sealed prediction registers written before each measurement, and the Python scripts that reproduce every statistic and figure of the paper from the CSV files. The fluctuation-fitting routine itself is described in a separate methodological manuscript and is available from the authors on request; all its outputs are provided here. Data: CC BY 4.0; code: MIT.