This case study is about forecasting wintery conditions in Scandinavia during January 2021.

The case includes:

• Seasonal forecasts (anomalies, teleconnections, verification)
• Extended-range forecasts (anomalies, probabilities, regime forecasts, MJO and SSW)
• Medium-range forecasts (Ensemble mean and spread, cyclonic features, clusters, EFI and SOT)
• Weather parameters (precipitation type, point rainfall, wind gusts, waves, visibility)

Sections:

1. Seasonal

2. Extended-range

3. Early medium-range

4. Late medium-range

5. Outcome and Discussions