
© ICWRRare octuplet waterspouts spotted over the Baltic Sea on August 21, 2025.
A rare waterspout outbreak occurred over the Baltic Sea on August 21, 2025, producing at least 12 waterspouts off the coast of Poland and 8 off Denmark, including one sighting of eight simultaneous funnels.
A rare outbreak of waterspouts was reported over the Baltic Sea on August 21, with multiple independent observers documenting at least 20 funnels. Reports confirmed 12 waterspouts off Poland and 8 off Denmark, including a Danish observer who recorded eight aligned simultaneously.
The event was documented by the International Centre for Waterspout Research (ICWR), which tracks and archives global waterspout activity. Such outbreaks are defined as days with multiple waterspouts in close temporal and spatial proximity.
Climatological classifications distinguish between small outbreaks (5 - 9 waterspouts per day), moderate outbreaks (10 - 19), and large outbreaks (20 or more). Based on available data, the August 21 event qualifies as a large outbreak.
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