What does this research mean for the field?

ECMWF seasonal snow hindcasts consistently provide marginally useful to perfect reliability for predicting low- and high-snow conditions, although this reliability is sensitive to the choice of verification dataset. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the probabilistic reliability of ECMWF seasonal snow water equivalent hindcasts for low- and high-snow accumulation winter conditions.

August 23, 2026The cryosphereOpen Access

On the reliability of seasonal snow forecasts

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To evaluate the probabilistic reliability of ECMWF seasonal snow water equivalent hindcasts for low- and high-snow accumulation winter conditions.
Assessed ECMWF winter-mean snow water equivalent (SWE) hindcasts from 1993 to 2022 across eight Northern Hemisphere non-mountainous land regions.
Benchmarked probabilistic forecasts of tercile-based low- and high-snow events against two independent reference datasets: ERA5-Land and ESA Snow-CCI v4.
Quantified reliability into five categories ranging from perfect to dangerous using weighted linear regression applied to reliability diagrams.
ECMWF seasonal snow hindcasts consistently scored in the marginally useful to perfect reliability categories for both low- and high-snow accumulation events regardless of the benchmark used.
Verification using ERA5-Land consistently produced higher reliability ratings than ESA Snow-CCI, typically ranking 1 to 2 categories higher.

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Implication

Model evaluation study reveals marginally useful to perfect reliability for seasonal snow hindcasts across Northern Hemisphere regions, indicating strong utility for winter climate forecasting.

Cite This Study

Vorobeva et al. (2026) studied this question.

synapsesocial.com/papers/6a8aad167677a34114445510 https://doi.org/10.5194/tc-20-4605-2026

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Implication

Model evaluation study reveals marginally useful to perfect reliability for seasonal snow hindcasts across Northern Hemisphere regions, indicating strong utility for winter climate forecasting.

On the reliability of seasonal snow forecasts

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Implication

Cite This Study

On the reliability of seasonal snow forecasts

Key Points

Discussion

Implication

Cite This Study

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