Status:Ongoing analysis Material Status: Finalised Material from: Linus, Fernando
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Discussed in the following Daily reports: |
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Report from Zoltan Sipos:
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On 17 September, 2017 in northern Serbia and western Romania occurred a derecho event, which corresponds to the definition of this phenomenon: wind damage extends for more than 400 kilometers, includes wind gusts of 93 km/h along most of its length, and also includes several, well-separated 121 km/h or greater gusts. There were 8 dead and dozens injured. |
In western Romania, at meteorological or airport weather stations, the wind gusts reached: 25 m/s Sinnicolau Mare, Batos, Sighetu Marmatiei, Bistrita; 26 m/s Zalau, Baia Mare, Ocna Sugatag, Sebes, Alba Iulia; 27 m/s Cluj Napoca, Deva, Toplita, Tg. Lapus, Arad airport; 28 m/s Tebea, Poiana Stampei, Sarmasu, 29 m/s Borod, Holod; 30 m/s Timisoara, Resita; 31 m/s Siria; 32 m/s Varadia de Mures, Rosia Montana; 34 m/s Jimbolia, Gurahont; 35 m/s Stei; 36 m/s Ceahlau Toaca; 39 m/s Banloc, 40 m/s Huedin; 42 m/s Vladeasa 1800. There were 8 dead and dozens injured.
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Severe weather reports from the European Severe Weather Database for 17th September 2017:
2. Description of the event
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T+072-096h:
T+096-120h:
T+120-144h:
Straight-line winds of 35 m/s have been reported at Stei weather station (see ESWD reports plot at the top of this page) and they caused significant damage. At the same time a bow echo was observed in the radar imagery. CAPESHEAR parameter looks more extreme than CAPE in the forecast. This again suggests that deep-layer wind shear played a major role in the severe convective outbreak. CDFs for CAPE (left) and CAPESHEAR (right) over Stei are shown below.
3.4 Monthly forecasts
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4. Experience from general performance/other cases
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5. Good and bad aspects of the forecasts for the event
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