Cyclone Herwart

Cyclone Herwart was a European windstorm that affected Southern Denmark, Germany, Poland, Austria, Hungary and the Czech Republic on 28–29 October 2017. Named by the Free University of Berlin Meteorology Department,[5] the storm was an extratropical cyclone formed as a secondary low to a more northerly centre of low pressure named Grischa coming southward from the Svalbard Islands region, the latter splitting in two low-pressure areas late on 28 October.[6] The center of Herwart started rotating counterclockwise around the main low pressure area, passing over Norway, Sweden, Latvia and then losing power while moving over western Russia.[7]

Herwart Ingolf
IR satellite loop storm Herwart/Ingolf on 29 October 2017
Path of Cyclone Herwart-Ingolf across Europe
(Part of the 2017–18 European windstorm season)
Area affectedDenmark, Germany, Poland, Czech Republic, Austria, Slovakia, Hungary.[1]
Date of impact29 October 2017
Maximum wind gust182 km/h (113 mph) (Luční bouda)[2]
Lowest pressure970 hPa (29 inHg)[3]
Fatalities11[4]

In Denmark, which was hit on 28 October, the storm was named Ingolf.[8] In Hungary, the storm was named Nárcisz (Narcissus), a Hungarian female name whose name day is on 29 October.[9]

Meteorological history

[10]

Impact

The storm and rainfall caused death and destruction. Train connections were closed in Northern Germany,[11][12][13] and major bridges in Denmark were closed for traffic. Herwart caused disruption to the German energy market as the strong winds caused an over-supply of energy onto the German power grid. Prices for energy slipped into negative values as low as minus €83.06 per megawatt hour, with an average low of minus €52.11 (normal energy prices are €37 per megawatt hour). These values were the lowest since Christmas 2012. This can lead to a situation where Austria and Switzerland find it attractive to use the energy in their pumped storage reservoirs, where it can later be sold back to Germany.[14]

Herwart was not as strong as Xavier which struck Germany earlier in October 2017.[15] Herwart is considered one of the strongest storms of the past 10 years in Germany, ranked in 8th place in the strongest storms there in the last decade, but not considered memorable when compared to the strongest storms such as Kyrill (2007) and Lothar (1999).[16] Herwart was responsible for the worst insurance losses in the Czech Republic since the storms Kyrill and Emma (2008).[17]

References
  1. "Windstorm Herwart (Oct 2017)". www.rms.com. RMS. Archived from the original on 7 November 2017. Retrieved 30 October 2017.
  2. "Extrémně silná bouře má třetí oběť. Tisíce lidí jsou stále bez elektřiny" (in Czech). Mladá fronta Dnes. Retrieved 1 November 2017.
  3. "Tlaková níž Herwart priniesla nielen víchricu, ale aj zimné búrky - MeteoInfo.sk". meteoinfo.sk (in Slovak). 30 October 2017. Retrieved 12 December 2017.
  4. "Extratropical cyclone Herwart loss put at EUR 252m by PERILS | Artemis.bm". Artemis.bm - The Catastrophe Bond, Insurance Linked Securities & Investment, Reinsurance Capital, Alternative Risk Transfer and Weather Risk Management Blog. 11 December 2017. Retrieved 11 December 2017.
  5. "Analysis" (in German). Free University of Berlin. 28 October 2017. Archived from the original on 24 March 2019. Retrieved 5 November 2017.
  6. "Wetterdienst warnt vor Sturm "Grischa" - Bahn befüchtet Probleme". www.wz.de (in German). 28 October 2017. Retrieved 30 October 2017.
  7. "Analysis" (in German). Free University of Berlin. 31 October 2017. Archived from the original on 24 March 2019. Retrieved 5 November 2017.
  8. "Stormen Ingolf rammer Danmark i nat". vejr.tv2.dk (in Danish). 28 October 2017. Retrieved 30 October 2017.
  9. "Miért kapott kedves virágnevet a hazánkban pusztító ciklon?". 24.hu (in Hungarian). 30 October 2017. Retrieved 6 November 2017.
  10. Haeseler, Susanne; Lefebvre, Christiana (30 October 2017). "Sturmtief HERWART sorgt am 28./29. Oktober 2017 für Orkanböen über Deutschland" (PDF) (in German). DWD. Retrieved 11 December 2017.
  11. "Wetter: Sturm "Herwart": Tod, Trümmer und Bahnchaos". Die Zeit (in German). 29 October 2017. ISSN 0044-2070. Retrieved 30 October 2017.
  12. "Wetter: Sturm "Herwart" trifft auf Deutschland". Die Zeit (in German). 29 October 2017. ISSN 0044-2070. Retrieved 30 October 2017.
  13. "Sturmtief Herwart: Drei Menschen sterben in Tschechien und Polen". Die Zeit (in German). 29 October 2017. ISSN 0044-2070. Retrieved 30 October 2017.
  14. Zschäpitz, Holger (31 October 2017). "Strompreise: "Herwart" offenbart Wahnsinn der Energiewende". DIE WELT (in German). Retrieved 9 November 2017.
  15. Schappert, Sebastian (28 October 2017). ""HERWART" - ein weiterer Herbststurm steht vor der Tür" (in German). Deutscher Wetterdienst. Retrieved 11 December 2017.
  16. Herold, Christian (30 October 2017). "Thema des Tages - Archiv - Die großen Herbst- und Winterstürme der vergangenen 10 Jahre". www.dwd.de (in German). Deutscher Wetterdienst. Retrieved 11 December 2017.
  17. "Storm Herwart insured loss estimate rising, now EUR 300m: Aon". Artemis.bm - The Catastrophe Bond, Insurance Linked Securities & Investment, Reinsurance Capital, Alternative Risk Transfer and Weather Risk Management Blog. 3 November 2017. Retrieved 7 November 2017.


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