Status:Ongoing analysis Material from: Esti, Linus, Ivan
Picture
1. Impact
On 11th August a severe wind storm hit north Poland causing the death of 5 people and significant damages to trees and cutting power to 340,000 households. Rescuers in northern Poland said they had to force their way through "kilometers" of fallen trees in the Tuchola Forest to reach the site of Friday night's tragedy. This severe storm was caused by a mesoscale convective system (MSC) and the observations between 00 and 23 UTC show wind gusts over 30 m/s, and in some points even greater than 35
2. Description of the event
IR satellite image VT:11/08/2017 21UTC
European Severe reports valid from 11/08/2017 at 00 UTC to 24 UTC
The plot below shows observations of 24-hour maximum wind gusts on 11 August. Note the observations of above 30 m/s in northern Poland 
3. Predictability
The plot below shows the 24-hour maximum wind gusts from the last HRES forecast before the event. The maximum wind gusts in the forecast are nowhere near the observed values in northern Poland.
3.1 Data assimilation
3.2 HRES
3.3 ENS
3.4 Monthly forecasts
3.5 Comparison with other centres
4. Experience from general performance/other cases