The main goal of this study is to present a recently developed classification method for weather types based on the vorticity and location synoptic centers relative Adriatic region. basis objective classification, applied region, subjective by Poje. Our algorithm considered daily mean sea-level pressure 500 hPa geopotential height define one out 17 possible types. We identify which type was rel...

introduction climate change is an important environmental hazard that has been discussed in recent years. increasing the number or frequency of extreme climatic events such as severe droughts, floods, storms, heat and cold waves and heavy rains are the evidences of climate change. any of these events, due to the severity and persistence and their spread are a natural hazard that adverse effects...

Three different potential predictors of forecast error – ensemble spread, mean errors of recent forecasts and the local gradient of the predicted field – were compared. The comparison was performed using the forecasts of 500 hPa geopotential and 2-m temperature of the ECMWF ensemble prediction system at lead times of 96, 168 and 240 h, over North America for each day in 2004. Ensemble spread wa...

High-amplitude ridges can enforce heat-trapping systems that persist through an entire season, contributing to drought events. However, the impacts of day-to-day weather system changes at meso- and synoptic-scale are also important, albeit less well studied. We identify five types (WTs) from 500-hPa geopotential height anomalies. These categories include WT4, which represents associated dry war...

Interdecadal variability in the North Pacific region is investigated in a 500-y control integration of the Hamburg ECHAMcLSG coupled ocean-atmosphere general circulation model. The spectrum is predominantly red, but a significant peak with a period of about 18 y is detected in the spectrum of sea surface temperature (SST). This peak is shown to be associated with an irregular oscillation that i...

Data-driven medium-range weather forecasting has attracted much attention in recent years. However, the accuracy at high resolution is unsatisfactory currently. Pursuing high-resolution and high-quality forecasting, we develop a data-driven model SwinRDM which integrates an improved version of SwinRNN with diffusion model. performs predictions 0.25-degree achieves superior to IFS (Integrated Fo...

Using ERA5 reanalysis data from March 2021 to February 2022 and the China Meteorological Administration Global Forecasting System (CMA-GFS) operational forecast dataset of 500 hPa geopotential height in Northern Hemisphere same period, multiscale features errors are analyzed. The results indicate that anomaly correlation coefficient (ACC) its components keep decreasing with extension lead time,...

The relationship between winter (DJF) rainfall over Portugal and the variable large scale circulation is addressed. It is shown that the poles of the sea level pressure (SLP) field variability associated with rainfall variability are shifted about 15° northward with respect to those used in standard definitions of the North Atlantic Oscillation (NAO). It is suggested that the influence of NAO o...