Blizzards Costa Rica Frontal Tracking Scheme (FTS) GPS Lagrangian numerical method Latin America MODIS MedFTS Mediterranean Research & information: general Spercheios river basin anthropogenic land cover changes atmospheric sounding blowing snow climatology cold fronts drought forecasting hydrological model MIKE-SHE identification scheme ocean mixing ocean modeling precipitable water vapor self-organizing maps synoptic typing time-series statistical analysis trend analysis