Cyclone Herwart

{{Short description|2017 European windstorm}}

{{use dmy dates|date=December 2017}}

{{Infobox windstorm small

| name=Herwart Ingolf

| image=Ingolfkarte.gif

| caption=IR satellite loop storm Herwart/Ingolf on 29 October 2017

| duration=29 October 2017

| fatalities= 11{{cite news|title=Extratropical cyclone Herwart loss put at EUR 252m by PERILS {{!}} Artemis.bm|url=http://www.artemis.bm/blog/2017/12/11/extratropical-cyclone-herwart-loss-put-at-eur-252m-by-perils/|access-date=11 December 2017|work=Artemis.bm - The Catastrophe Bond, Insurance Linked Securities & Investment, Reinsurance Capital, Alternative Risk Transfer and Weather Risk Management Blog|date=11 December 2017}}

| damage=

| power outages=

| minpressure= {{cvt|970|hPa|inHg}}{{cite news|title=Tlaková níž Herwart priniesla nielen víchricu, ale aj zimné búrky - MeteoInfo.sk|url=http://meteoinfo.sk/clanok/52229-tlakova-niz-herwart-priniesla-nielen-vichricu-ale-aj-zimne-burky|access-date=12 December 2017|work=meteoinfo.sk|date=30 October 2017|language=sk}}

| gust={{cvt|182|km/h|mph}} (Luční bouda){{cite news |url=https://zpravy.idnes.cz/pocasi-vitr-vlaky-omezeni-09b-/domaci.aspx?c=A171030_060919_domaci_jn |title=Extrémně silná bouře má třetí oběť. Tisíce lidí jsou stále bez elektřiny |publisher=Mladá fronta Dnes |access-date=2017-11-01 |language=cs}}

| RSI=

| final=

| area affected=Denmark, Germany, Poland, Czech Republic, Austria, Slovakia, Hungary.{{cite web|title=Windstorm Herwart (Oct 2017)|url=http://www.rms.com/current-catastrophes/CatSummary?event_id=3946117|website=www.rms.com|publisher=RMS|access-date=30 October 2017|archive-url=https://web.archive.org/web/20171107030558/http://www.rms.com/current-catastrophes/CatSummary?event_id=3946117|archive-date=7 November 2017|url-status=dead}}

| track = Path of storm Herwart-Ingolf across Europe.png

| trackcaption = Path of Cyclone Herwart-Ingolf across Europe
(Part of the 2017–18 European windstorm season)

}}

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,{{cite web|language=de|url=http://www.met.fu-berlin.de/de/wetter/maps/Analyse_20171028.gif|title=Analysis|publisher=Free University of Berlin|date=28 October 2017|access-date=5 November 2017|archive-date=24 March 2019|archive-url=https://web.archive.org/web/20190324213932/http://www.met.fu-berlin.de/de/wetter/maps/Analyse_20171028.gif|url-status=dead}} 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.{{Cite news|url=http://www.wz.de/lokales/nrw/wetterdienst-warnt-vor-sturm-grischa-bahn-befuechtet-probleme-1.2544949|title=Wetterdienst warnt vor Sturm "Grischa" - Bahn befüchtet Probleme|date=2017-10-28|work=www.wz.de|access-date=2017-10-30|language=de}} 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.{{cite web|language=de|url=http://www.met.fu-berlin.de/de/wetter/maps/Analyse_20171031.gif|title=Analysis|publisher=Free University of Berlin|date=31 October 2017|access-date=5 November 2017|archive-date=24 March 2019|archive-url=https://web.archive.org/web/20190324213929/http://www.met.fu-berlin.de/de/wetter/maps/Analyse_20171031.gif|url-status=dead}}

In Denmark, which was hit on 28 October, the storm was named Ingolf.{{Cite news|url=http://vejr.tv2.dk/2017-10-28-stormen-ingolf-rammer-danmark-i-nat|title=Stormen Ingolf rammer Danmark i nat|date=2017-10-28|work=vejr.tv2.dk|access-date=2017-10-30|language=da}} In Hungary, the storm was named Nárcisz (Narcissus), a Hungarian female name whose name day is on 29 October.{{Cite news|url=http://24.hu/tudomany/2017/10/30/miert-kapott-kedves-viragnevet-a-hazankban-pusztito-ciklon/|title=Miért kapott kedves virágnevet a hazánkban pusztító ciklon?|date=2017-10-30|work=24.hu|access-date=2017-11-06|language=hu-HU}}