Material from: Linus
1. Overview
On 27 December the windstorm Johannes affected northern Europe causing a lot of fallen trees and power cuts in e.g Sweden.
2. Analyses and Observations
2.1 Event Definition
The evaluation will focus on the 24-hour maximum mean wind on 27 December 00UTC to 28 December 00UTC in the box 0.5x0.5 degree box centred on Orskar, Sweden (60.5N, 18.4E)
2.2 Analyses
The plots below show analyses of MSLP and 6 hour rainfall from 25 December 00UTC to 28 December 00UTC, every 12th hour.
The plots below show analyses of z500 and T850 from 21 December to 29 December (all 00UTC).
2.3 Observations
2.4 Climatological perspective
3. Forecasts
3.1 Data assimilation and observation usage
3.2 Single Forecasts for the event based on 00UTC forecasts (defined in Section 2.1)
Observations and analysis for the event
Control forecast (IFS 9-km resolution)
DestinE (IFS 4.4km resolution)
AIFS-single (AIFSv1.0 ~0.25 resolution)
AIFS-CRPS ensemble (~0.25 degree resolution)
3.3 Ensemble distribution
EFI (based on IFS 9-km ensemble)
The plots below show EFI and SOT for 24-hour maximum wind gusts on 28 December.
Forecast Evolution plot
The plot below shows the forecast evolution for the 24-hour maximum mean wind around Orskar in Sweden on 28 December.
3.4 Sub-seasonal forecasts