Storm Poly

Not to be confused with Cyclone Pola, Cyclone Polly, or Hurricane Polo.

Storm Poly
Poly at peak intensity on 5 July 2023.
Meteorological history
Formed4 July 2023
Dissipated7 July 2023
Extratropical cyclone
Highest winds110 km/h (70 mph)
Highest gusts150 km/h (95 mph)
Lowest pressure985 hPa (mbar); 29.09 inHg
Overall effects
Fatalities2
Damage>€50 million (2023)
Areas affected
United Kingdom, Belgium, Netherlands, Germany
Part of the 2022-23 European windstorm season

Storm Poly, also known as Cyclone Poly,[1] was a powerful European windstorm and a rare summertime cyclone.[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 since the start of the measurements, 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]

According to a research conducted by the Utrecht University and the Royal Dutch Meteorological Institute, Poly could be classified as a hybrid cyclone.[10]

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.[11] In the Schiphol Airport in Amsterdam, around 400 flights were canceled.[12] Hundreds were stranded in Amsterdam's central station since several domestic and overseas rail services were cancelled.[7] In the morning of 5 July, an emergency alert was issued in the province of Noord-Holland and residents were urged to stay at home.[13]

Hurricane-force wind gusts were measured in the province of Noord-Holland, causing large amounts of damage. Poly was the first very severe storm in the Netherlands since 18 January 2018 and the strongest storm in the Netherlands since 1990. It was also the first very severe storm in the summer since the start of the measurements. The storm was responsible for local floodings in the Netherlands.[14] Over 25,000 households lost electricity due to Storm Poly.[15] Around 1,100 trees in the municipality of Beverwijk fell.[16] Park Westerhout, which is located in the municipality of Beverwijk, was closed for over a month due to the impact caused by Poly.[17] Multiple beach cottages were leveled to the ground in IJmuiden.[18] The roof of a house in Egmond aan Zee collapsed.[19] All beach cottages in Egmond aan Zee were blown over.[20] Multiple cars were damaged in Egmond aan Zee.[21] Fences, roofs, and cars were damaged in the municipality of Uitgeest.[22] A row of trees were blown over and blocked the A9 motorway.[23] A pavillion in Castricum was damaged by Poly.[24] The residents of 24 apartments in Heemskerk were evacuated. The facade of a sports hall in Beverwijk collapsed. A car and a bus in Heemskerk were severely damaged. 130 incidents were reported in the municipality of Heemskerk.[25] Poly caused water supply issues at some locations in the province of Noord-Holland, lasting for up to a week.[26]

Germany

The Deutscher Wetterdienst issued a level-three red warning for most of northern Germany, including Hamburg.[27] 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.[28]

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.[29] In Belgium, the Royal Meteorological Institute issued a code-yellow alert for all of the Flemish provinces, excluding Flemish Brabant, on 5 July.[30] When Poly affected Belgium, it primarily brought severe thunderstorms and locally intense gusts to the nation.[31]

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

References

  1. ^ "Ravage, verdriet en indrukwekkende plaatjes: de storm in foto's".
  2. ^ "Poly: A Perfect Storm - Phenomenology, North Sea Influence, and Insights into Hybrid Cyclogenesis". studenttheses.uu.nl.
  3. ^ https://www.eumetsat.int/storm-poly
  4. ^ "Storm Poly – Strongest summer storm on record hits the Netherlands". Watchers. 5 July 2023. Retrieved 14 January 2024.
  5. ^ a b "Poly is zwaarste zomerstorm ooit gemeten". Weer.nl (in Dutch). 5 July 2023. Retrieved 15 January 2024.
  6. ^ "Rare, potent summer windstorm turns deadly in Netherlands and Germany". AccuWeather. 5 July 2023. Retrieved 15 January 2024.
  7. ^ a b c "Two dead as strongest summer storm blasts Netherlands, Germany". phys.org. Retrieved 15 January 2024.
  8. ^ NDR. "Sturmtief "Poly": Bahnverkehr stabilisiert sich nach Unwetter". www.ndr.de (in German). Retrieved 15 January 2024.
  9. ^ Sanou, Hanneke (6 July 2023). "Damage done by Poly estimated at €50-100m but could be higher". DutchNews.nl. Retrieved 15 January 2024.
  10. ^ "Poly: A Perfect Storm - Phenomenology, North Sea Influence, and Insights into Hybrid Cyclogenesis". studenttheses.uu.nl.
  11. ^ "Waarom zo laat naar code rood? 'Pas om 07.00 uur duidelijk hoe erg het werd'". nos.nl (in Dutch). 5 July 2023. Retrieved 15 January 2024.
  12. ^ "Chaos op Schiphol: 400 vluchten geschrapt, tientallen vliegtuigen kunnen niet landen". www.nhnieuws.nl (in Dutch). Retrieved 15 January 2024.
  13. ^ "Heel Noord-Holland krijgt NL-Alert en moet binnenblijven vanwege storm Poly". NU. Retrieved 7 May 2026.
  14. ^ "Van open sluis naar zeiknat huis! Storm Poly zorgt voor ondergelopen schuren in Hoorn".
  15. ^ "Duizenden huishoudens zonder stroom door storm Poly".
  16. ^ "Bomen planten: een groene ruggengraat voor Beverwijk". Gemeente Beverwijk. Retrieved 6 May 2026.
  17. ^ "Levensgevaarlijk in Beverwijks park sinds storm Poly; burgemeester kondigt noodverordening af". Telegraaf. Retrieved 6 May 2026.
  18. ^ "Schade aan strandhuisjes door storm Poly". Jutter. Retrieved 6 May 2026.
  19. ^ "Storm Poly verwoestte zijn huis; zit zeeman Theo (85) er deze kerst eindelijk warm bij?". NH Nieuws. Retrieved 6 May 2026.
  20. ^ "Richie kijkt machteloos toe hoe storm Poly Egmondse strandhuisjes verwoest". NH Nieuws. Retrieved 6 May 2026.
  21. ^ "Storm Poly hield huis in Egmond; veel grote en kleinere schades". Flessenpost uit Egmond. Retrieved 6 May 2026.
  22. ^ "Storm Poly houdt huis in Uitgeest". De Uitgeester. Retrieved 6 May 2026.
  23. ^ "Weerman Wouter meet zware windstoten van 130 kilometer per uur: 'Ik verwacht veel schade'". Algemeen Dagblad. Retrieved 6 May 2026.
  24. ^ "Storm Poly zorgde voor chaos". Rodi. Retrieved 6 May 2026.
  25. ^ "Complete flat ontruimd, honderden bomen omgewaaid en een ruige zee: storm Poly teistert ook Beverwijk en Heemskerk". Noordhollands Dagblad. Retrieved 6 May 2026.
  26. ^ "Op paar plekken in Noord-Holland nog steeds waterproblemen door storm Poly". NU. Retrieved 7 May 2026.
  27. ^ "Weather tracker: Storm Poly lashes Germany and the Netherlands | Netherlands | The Guardian". amp.theguardian.com. Retrieved 15 January 2024.
  28. ^ "Storm Poly lashes the Netherlands and parts of Germany, causing 2 deaths and canceled flights". AP News. 5 July 2023. Retrieved 15 January 2024.
  29. ^ "Wimbledon rain turns into Storm Poly with midweek red wind warnings for the Netherlands". www.netweather.tv. Retrieved 15 January 2024.
  30. ^ Times, The Brussels. "Code yellow extended in Flanders and Liège until Wednesday evening". www.brusselstimes.com. Retrieved 15 January 2024.
  31. ^ Colin, Clapson (5 July 2023). "Code yellow weather warning in Flanders". vrtnws.be. Retrieved 15 January 2024.

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