SMHI Investigates Weather Warning Adequacy Following Severe Weather in Västernorrland
SMHI is reviewing its weather warning protocols after severe weather led to significant destruction in Västernorrland.
Key Points
- • SMHI is evaluating the adequacy of its yellow weather warnings before the storm.
- • Severe weather caused train derailments and road damage in Västernorrland.
- • The highest recorded rainfall was 72 mm, with some areas exceeding 100 mm.
- • A public warning message (VMA) was issued as a response to the storm.
On September 8, 2025, the Swedish Meteorological and Hydrological Institute (SMHI) announced it is conducting an investigation into whether its yellow weather warnings were adequate prior to the severe weather that struck Västernorrland. This storm caused a cascade of serious consequences, including the derailment of two freight trains, significant road damage, and widespread flooding in basements.
Meteorologist Magnus Nilsson Sangrud stated that the primary aim of the investigation is to assess if the warnings were sufficient, as the storm's impact was notably substantial. Yellow warnings, the least severe designation on a three-tier scale, suggest potential societal impacts, whereas orange and red warnings would indicate more serious threats. The storm was fueled by a low-pressure system, resulting in heavy rains, with reports indicating that the highest recorded rainfall around Aspeå reached 72 mm—nearly the monthly average for September. Localized reports, however, noted rainfall exceeding 100 mm in certain areas.
In response to the challenges posed by the storm, a public warning message (VMA) was issued to inform and prepare the public. As the investigation unfolds, results will shed light on the effectiveness of the response to this weather crisis and will be pivotal in re-evaluating the protocols used for issuing weather warnings in the future.