7560 20260127130859.0 CTALK-2025-0072 Pottiaux, Eric GNSS Severe Weather Monitoring, Tropospheric Gradients and Slants Delays: Activities at the Royal Observatory of Belgium 2025 2025-03-21 NO GNSS Water Vapour ZTD Gradients Slant delays Nowcasting Severe Weather GNSS Severe Weather Monitoring, Gradients and Slants Meeting, Sofia, Bulgaria eric.pottiaux@ksb-orb.be Contributed CTALKCONT