Mika Rantanen

@mikarantane.bsky.social

7536 Followers 519 Following

Researcher at the Finnish Meteorological Institute. Climate change, extreme weather and attribution of extreme events. PhD in meteorology from the University of Helsinki.

2 m temperature weekly mean anomaly from ECMWF sub-seasonal forecast. The colors are red in Europe, with > 10 °C above normal over France.
Screenshot from BBC weather (https://www.bbc.com/weather/2988507), showing extremely high temperatures for Paris for the coming week.
Photo of Victoria Sinclair, standing at the corridor of University of Helsinki. Photo by University of Helsinki from https://researchportal.helsinki.fi/en/persons/victoria-sinclair/
Time series graph of Finland's mean temperature in MAM, with the record year 2026 highlighted.
Time series of May maximum temperatures in Heathrow, London in 1960–2026. 10, 100 and 1000-year return levels are added as dashed lines, and the value observed in 2026 (35.0 °C) matches with the 1000-year return level.
Time series of highest May temperature in 1960–2026 in London Heathrow, UK. Data retrieved from KNMI Climate Explorer.
Sounding profile from Essen, Germany. 500-hPa height was 5936 gpm and the value is highlighted with red.
Satellite image of Europe, overlaid with 500-hPa heights as yellow contours.
Geopotential heights at 500 hPa showing the peak value of 5921 gpm. EMCWF forecast map from meteologix.com.
Ice chart on 10 May 2026 showing no ice in the Bothnian Bay.
Cumulative precipitation in Finland since January 1st 2026.
Time series graph showing the Mar-Apr average temperature in Finland in 1900-2026.
Screenshot of satellite image showing cloudless conditions under the blocking high.
Figure 3.1 of the report. Heatwaves in sub-Arctic Fennoscandia since 1950. The circle size is proportional to the area affected by the corresponding event. The 10 most severe heatwaves are indicated by darker colours and grey indicates those with a severity ranking below 10.
50-vuotinen liukuva lineaarinen lämpenemistrendi Suomessa.
Figure 1.2 of the ESOTC2025 report. Trend in annual surface air temperature (°C/decade) for 1996–2025. Data: ERA5. Credit: C3S/ECMWF.
Ensemble forecast for 850-hPa temperatures for Helsinki, Finland.
ECMWF forecast for Sunday 06 UTC showing strong windstorm over eastern Finland with snowfall and strong winds.
Accumulated precipitation in Helsinki Kaisaniemi since January 1st, 2026. The value in 2026 is outside the 1845–2025 max/min values.
Sea surface temperature anomaly in the Nino3.4 region.
Päivittäinen lumensyvyys ja sen klimatologia Suomen itäosassa.
Aikasarjagraafi maan itäosan sademääristä aikavälillä 1.1.–14.4. vuosina 1961–2026.