{"id":4836,"date":"2020-10-07T11:09:39","date_gmt":"2020-10-07T09:09:39","guid":{"rendered":"https:\/\/www.essl.org\/cms\/?p=4836"},"modified":"2020-10-07T11:20:29","modified_gmt":"2020-10-07T09:20:29","slug":"severe-weather-outbreak-on-4-5-october-2020","status":"publish","type":"post","link":"https:\/\/www.essl.org\/cms\/severe-weather-outbreak-on-4-5-october-2020\/","title":{"rendered":"Severe weather outbreak in Slovakia and Poland on 4 – 5 October 2020"},"content":{"rendered":"\n

Severe weather outbreaks in autumn are quite typical over the Mediterranean but rarer over continental parts of Europe. On 4 and 5 October, an unusual synoptic-scale situation led to an outbreak of severe thunderstorms over eastern Slovakia and Poland. <\/p>\n\n\n\n

During these two days, a total of 36 large hail reports (with 5 reports of hail exceeding 5 cm in diameter), 71 reports of severe wind gusts (with several instances of F1 damage), 4 reports of damaging lightning and an F1 tornado report were entered into the European Severe Weather Database (eswd.eu<\/a>). The map below gives an overview of the impacts. While severe convective wind gusts are not uncommon with deep low pressure systems over this part of Europe, hail reaching 7 cm or more in diameter is exceptional for this time of year.<\/p>\n\n\n\n

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Severe weather reports on 4 and 5 October 2020. Data source: eswd.eu<\/a><\/em><\/figcaption><\/figure><\/div>\n\n\n\n

The outbreak was caused by severe thunderstorms developing in a very warm and moist airmass that had been advected northward from the southern Mediterranean Sea (Fig 2). Mixing ratios of 10 – 12 g\/kg allowed 500 – 1500 J\/kg of MLCAPE to build over the area. Combined with strong vertical wind shear (exceeding 20 m\/s in the 0-3 km layer), thunderstorms quickly turned severe as they organized into supercells and bow-echoes. <\/p>\n\n\n\n

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IR satellite imagery combined with an ECMWF forecast of specific humidity at 500 m AGL (g\/kg, filled contours) and lapse rates between 850 and 500 hPa (K\/km, red to purple contours). Forecast sounding and hodograph are representative of the location indicated by red cross. <\/em><\/figcaption><\/figure>\n\n\n\n

More information concerning the F1 tornado over southern Slovakia can be found here<\/a>. ESSL would like to thank Skywarn Polska and the Slovak Hydro-Meteorological Institute for providing severe weather reports!<\/p>\n","protected":false},"excerpt":{"rendered":"

Severe weather outbreaks in autumn are quite typical over the Mediterranean but rarer over continental parts of Europe. On 4 and 5 October, an unusual synoptic-scale situation led to an outbreak of severe thunderstorms over eastern Slovakia and Poland. During … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,1],"tags":[],"class_list":["post-4836","post","type-post","status-publish","format-standard","hentry","category-news","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/posts\/4836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/comments?post=4836"}],"version-history":[{"count":9,"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/posts\/4836\/revisions"}],"predecessor-version":[{"id":4852,"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/posts\/4836\/revisions\/4852"}],"wp:attachment":[{"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/media?parent=4836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/categories?post=4836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.essl.org\/cms\/wp-json\/wp\/v2\/tags?post=4836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}