Storm Poly
Subtropical storm over the North Sea in 2023
From Wikipedia, the free encyclopedia
Storm Poly, also known as Cyclone Poly,[1] was a powerful European windstorm.[2] The storm affected the Benelux, Germany, and the United Kingdom during July 2023. The thirty-seventh windstorm of the 2022–23 European windstorm season, Poly was named by the Free University of Berlin on 4 July. It later became the most intense summer storm to impact the Netherlands, bringing destructive gusts to the nation, peaking at 148 km/h (92 mph) in IJmuiden.[3][4][5] In Germany, lesser winds of 80–97 kilometres per hour (50–60 mph) were recorded.[6] In total, two fatalities occurred: one in the Netherlands,[7] and another in Germany.[8] Poly caused at least €50,000,000 (2023) in damages.[9] There was a mild storm surge in the Netherlands due to Poly, which caused limited floodings in combination with a large amount of precipitation.
Poly at its peak intensity. | |
| Meteorological history | |
|---|---|
| Formed | 4 July 2023 |
| Dissipated | 7 July 2023 |
| Extratropical cyclone | |
| Highest winds | 130 km/h (80 mph) |
| Lowest pressure | 987 hPa (mbar); 29.15 inHg |
| Overall effects | |
| Fatalities | 2 |
| Damage | Severe |
| Areas affected | United Kingdom, Belgium, Netherlands, Germany |
Part of the 2022-23 European windstorm season | |
Preparations and impacts
The Netherlands
The Netherlands was affected the most by the storm.[5] A red wind warning was issued for the provinces of North Holland, Flevoland and Friesland as strong gusts were expected.[10] In the Schiphol Airport in Amsterdam, around 400 flights were canceled.[11] Hundreds were stranded in Amsterdam's central station since several domestic and overseas rail services were cancelled.[7] Hurricane-force winds were measured in the province of Noord-Holland, causing large amounts of destruction. Poly was the first very severe storm in the Netherlands since 18 January 2018 and the strongest storm since 1990 in general. It was also the first very severe storm in the summer, obliterating all previous records. The storm was responsible for local floodings in the Netherlands.[12] Over 25,000 people lost electricity due to Storm Poly.[13]
Germany
The Deutscher Wetterdienst issued a level-three red warning for most of northern Germany, including Hamburg.[14] High-speed rail services to Cologne and Hamburg were cut off.[7] Additionally, some ferries from Germany to islands off the north coast were canceled, while powerful gusts toppled trees, disrupting a line between Hamburg and Sylt.[15]
United Kingdom And Belgium
The precursor low-pressure area to Poly would produce heavy rain for East Anglia, causing a game in Wimbledon to be postponed.[16] In Belgium, the Royal Meteorological Institute issued a code-yellow alert for all of the Flemish provinces, excluding Flemish Brabant, on 5 July.[17] When Poly affected Belgium, it primarily brought severe thunderstorms and locally intense gusts to the nation.[18]
Highest wind gust per country
| Country | Gust | Location |
|---|---|---|
 Belgium |
114 km/h (71 mph) | De Panne |
 Germany |
119 km/h (74 mph) | Leuchtturm Alte Weser |
 Netherlands |
148 km/h (92 mph) | IJmuiden |
 United Kingdom |
150 km/h (93 mph) | Lowestoft |