What does this research mean for the field?

Derecho-favoring atmospheric environments in Finland have become increasingly frequent between 1980 and 2022, associated with accelerated regional warming and a negative trend in the summer mean Eastern Atlantic/Western Russia teleconnection index. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To characterize the synoptic and mesoscale atmospheric conditions associated with Finnish derechos and evaluate long-term trends in the frequency of these favorable environments from 1940 to 2022.

August 30, 2026Weather and Climate DynamicsOpen Access

Derecho-favoring atmospheric environments in Finland: characteristics, identification criteria, and frequency trends

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Authors

ORO. K. Rantala JRJouni Räisänen JRJenni Rauhala

Discussion

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Overview

Climatological study reveals an increasing frequency of derecho-favoring atmospheric conditions in Finland, suggesting severe convective windstorm risks may rise under regional warming.

Key Points

To characterize the synoptic and mesoscale atmospheric conditions associated with Finnish derechos and evaluate long-term trends in the frequency of these favorable environments from 1940 to 2022.
Analyzed atmospheric conditions across 10 severe convective wind events (eight summer derechos and two derecho-type events) using ERA5 reanalysis data spanning 1940–2022.
Formulated three identification criteria sets combining kinematic parameters (0–6 km and 0–10 km vertical wind shear, 6–10 km mean wind speed) and thermodynamic variables (convective available potential energy and 850 hPa equivalent potential temperature).
Applied spatial and co-location thresholds to historical reanalysis grids to track long-term changes in favorable environmental days.
Derechos consistently formed near the right entrance of an upper-level jet streak with moderate deep-layer shear, southerly warm-air advection, and equivalent potential temperatures exceeding 325 K at 850 hPa across all 10 cases.
Environments favoring derecho formation showed a marked increase in occurrence across Finland, particularly during the 1980–2022 period.
The rising frequency aligned with accelerated warming trends and a negative shift in the summer mean Eastern Atlantic/Western Russia teleconnection index.

Cite This Study

Rantala et al. (2026) studied this question.

synapsesocial.com/papers/6a93f0c06c1a8fb52e79d275 https://doi.org/10.5194/wcd-7-1571-2026

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August 30, 2026Weather and Climate DynamicsOpen Access

Derecho-favoring atmospheric environments in Finland: characteristics, identification criteria, and frequency trends

View Full Paper

Ask AI

Bookmark

Authors

ORO. K. Rantala JRJouni Räisänen JRJenni Rauhala

Discussion

Member takes

Overview

Climatological study reveals an increasing frequency of derecho-favoring atmospheric conditions in Finland, suggesting severe convective windstorm risks may rise under regional warming.

Key Points

To characterize the synoptic and mesoscale atmospheric conditions associated with Finnish derechos and evaluate long-term trends in the frequency of these favorable environments from 1940 to 2022.
Analyzed atmospheric conditions across 10 severe convective wind events (eight summer derechos and two derecho-type events) using ERA5 reanalysis data spanning 1940–2022.
Formulated three identification criteria sets combining kinematic parameters (0–6 km and 0–10 km vertical wind shear, 6–10 km mean wind speed) and thermodynamic variables (convective available potential energy and 850 hPa equivalent potential temperature).
Applied spatial and co-location thresholds to historical reanalysis grids to track long-term changes in favorable environmental days.
Derechos consistently formed near the right entrance of an upper-level jet streak with moderate deep-layer shear, southerly warm-air advection, and equivalent potential temperatures exceeding 325 K at 850 hPa across all 10 cases.
Environments favoring derecho formation showed a marked increase in occurrence across Finland, particularly during the 1980–2022 period.
The rising frequency aligned with accelerated warming trends and a negative shift in the summer mean Eastern Atlantic/Western Russia teleconnection index.

Cite This Study

Rantala et al. (2026) studied this question.

synapsesocial.com/papers/6a93f0c06c1a8fb52e79d275 https://doi.org/10.5194/wcd-7-1571-2026

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