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On 16 April Storm Hans brought extreme precipitation to the southern Alps, locally more than 400 mm/24h in a few locations according to high-density observations. In high altitude it fell as snow. The cyclonic system was named Hans. Connected to the same system, an IF1 tornado was registered near Verona in northern Italy on 17 April.
2. Analyses and Observations
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3.4 Sub-seasonal forecasts
The plots below show forecasts of weekly precipitation anomalies for 9-15 September.
The plots below show forecasts of weekly z500 anomalies for 9-15 September.
3.5 Comparison with other centres
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