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On 11-12 January central-northern parts of Sweden and southern Finland was hit by extreme snowfall together with strong winds. Some stations in central Sweden reported more than 50 cm of snow accumulation. A rare red warning was issued for the event by SMHI.
Material from SMHI (in Swedish):
https://www.smhi.se/bloggar/vaderleken-2-3336/over-en-halvmeter-nysno-i-angermanland-1.167725
2. Description of the event
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The plot below shows the forecast evolution for 24-hour precipitation ending on 12 January 12UTC averaged inside the box outlined in the plots above. The plot includes HRES (red dot), ENS control (purple dot), ENS distribution (blue boxes, median square and mean diamond) and model climate distribution (red boxes).
The below below shows the forecast evolution for 24-hour maximum wind gusts for the same region.
To evaluate the forecasts for the cold spell that followed after the cyclone, the plot below evaluates the forecasts for 2-metre temperature over southern Sweden 14-16 January, for the region outline in the 1-3 day EFI plot for the same period below. The cold signal started to appear on 28 December.
The plot below shows the joint probability of >10mm snowfall water eq. and >20 m/s wind gusts on the first 6 hours of 12 January in the forecast from 10 January.
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