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Cyclone Oratia

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Oratia (Tora)
Oratia on 30 October
TypeEuropean windstorm
Extratropical cyclone
Formed28 October 2000
Dissipated3 November 2000
Highest gust176 km/h (109 mph) in Camaret-sur-Mer, France
Lowest pressure941 mb (27.8 inHg)[1]
Fatalities16[2][3]
Areas affectedWestern Europe

Cyclone Oratia, (Tora in Norway)[4] was an unusually deep European windstorm which affected Western Europe early in the year for a storm of this type. The storm was the fiercest to hit Britain in October since the Great Storm of 1987, with wind gusts reaching 109 mph,[5] and gusting at up to 90 mph over much of the south of England. Its barometric pressure fell to 941 hPa, over the North Sea making it one of the deepest lows recorded in the country in October.[6] The lowest land-based pressure observation reached 951.2 hPa at RAF Fylingdales,[7] which is not lower than the UK record October value of 946.8 hPa observed at Cawdor Castle on 14 October 1981.[8] Three tornadoes were reported from this storm.[5] The storm contributed to the ongoing Autumn 2000 western Europe floods.

Meteorological history

On 26 October, a deep low pressure centre anchored between Greenland and Iceland, trailing a cold front across the North Atlantic Ocean which spawned three strong storms.[9] Cyclone Oratia developed in the Atlantic to the southwest of Ireland on 28 October during a strong 150 mph (240 km/h) upper level jet.[1] The low explosively deepened, with a 53 mb (1.6 inHg) drop in pressure in 18 hours preceding 1800 UTC on 30 October.[10] The centre of the low pressure passed south of Ireland, undergoing frontal fracture according to the Shapiro-Keyser model of cyclone development,[1] and continued across North Wales and Northern England on a line approximately from Aberystwyth–Manchester–Teesside.[11] The cyclone developed complex mesoscale features such as a sting jet, convective rainbands and inertial gravity waves.[1] Strong winds affected areas on both sides of the English Channel with the worst winds since 1987. The storm produced sustained hurricane-force winds across the North Sea.[1][11] Oratia began to fill as it approached Norway and was eventually absorbed by another cyclone.

Impact

France

The French regions principally affected were Brittany, Vendee, Cotentin, Île-de-France, Alsace and Cambrésis. The passage of the storm left three fatalities. A 30-year-old man was killed as his truck was crushed by a falling tree, a shop owner had a fatal fall while repairing a roof, and a motorist in Normandy succumbed. 7000 were left without power.[3] Flights from Paris-Orly and Paris-Charles de Gaulle Airport were affected.[12] In Lille trees were uprooted and scaffolding collapsed.[13]

Prior to the storm, a Cypriot freighter with engine damage off the port of Antifer in Seine-Maritime, was towed to Le Havre. A small oil tanker with eight crew was also ailing on Sunday morning near Boulogne, its tanks were empty and there was no risk of oil spill.[14] The Italian Tanker Ievoli Sun ran into trouble in the English Channel during the storm, the crew were evacuated after water intake at the bow, which filled the forward storage area and the bow thruster bay. The ship later sank approximatively 9 nautical miles off Casquets in the English Channel, with a 6,000-tonne load, including 4,000 tonnes of styrene, 1,000 tonnes of trichlorosilane and 1,000 tonnes of isopropyl alcohol, while under tow. This sparked fears that a leak could cause an environmental problem, a year after the tanker MV Erika caused a severe oil slick off the coast of France.[15]

Netherlands and Germany

MS Flottbek, a Columbian ship flying under Antiguan flag en route from Antwerp to Rotterdam, beached near Zoutelande on Zeeland during force 9 gales on October 29. The ship was carrying the chemicals phenol and lutensol. Four tugs failed initially to re-float it.[16][17] Oratia was described by the Royal Netherlands Meteorological Institute as the 35th worst storm since 1910.[11] Five people were injured after lightning caused a fire on an intercity train from Den Helder to Nijmegen half a kilometre from Utrecht Centraal railway station. The Police advised against using roads on the afternoon of 30 October.[18] At several places were trees on the road, with a jetty and many fences tumbling. Roofs, or parts thereof blew away, and also bus shelters.[17] During the passage of Oratia's cold front on 30 October, a harbour Seiche was observed in Rotterdam harbour with a period of 1.5 hours.[19]

In Germany winds up to 150 kilometres per hour (93 mph) were recorded at the Brocken in Lower Saxony, where a man was seriously injured. In Oldenburg, near gale-force winds resulted in two traffic accidents in which a man was seriously injured. In Brunswick, cars were damaged by falling trees. According to the head of the Weser-Ems-crisis center in Oldenburg, police arrived on highway 31 between Riepe and Leer in East Frisia to find heavy gusts had blown a truck off the road. Relatively little damage was caused, estimated at 5,000 marks.[20] On the coast at Hörnum on Sylt, a rescue cruiser was on alert. At Bremen Airport, the roof of a new building with an area of 100 square meters threatened to collapse. The forests of the mountains remained largely unscathed by the storm. In all forest districts of the Harz, only a few trees were knocked over in the high altitudes. In other mountain forest regions of southern Lower Saxony, such as the Brunswick wald and the Weser Uplands no significant damage was reported. Only isolated trees were knocked down. The German Weather Service announced the autumnal bad weather in Germany would subside by Tuesday October 31.[20]

References

  1. ^ a b c d e Browning, K. A. (2005). "Observational synthesis of mesoscale structures within an explosively developing cyclone". Quarterly Journal of the Royal Meteorological Society. 131 (606): 603–623. Bibcode:2005QJRMS.131..603B. doi:10.1256/qj.03.201. Retrieved 27 February 2012.
  2. ^ "2000 Global Register of Extreme Flood Events". dartmouth.edu. Retrieved 24 March 2012.
  3. ^ a b "Les News: Tempête du lundi 30 octobre 2000" (in French). lameteo.org. Retrieved 3 March 2012.
  4. ^ "Stormflo i Norge 2000-2005" (in Norwegian). Statens Kartverk. Retrieved 9 March 2012.
  5. ^ a b "Superstorm Sweeps Over England: Image of the Day". NASA. Retrieved 17 March 2012.
  6. ^ McCarthy, Michael (31 October 2000). "Is the changing climate pushing Britain's weather to new and violent extremes?". London: The Independent. Retrieved 27 February 2012.
  7. ^ Hewson, Tim (2001). "The North Sea storm of 30 October 2000". Weather. 56 (3): 115. Bibcode:2001Wthr...56..115H. doi:10.1002/j.1477-8696.2001.tb06547.x.
  8. ^ "National Meteorological Library and ArchiveFact sheet 9 — Weather extremes" (PDF). Met Office. Retrieved 31 May 2015.
  9. ^ "The storms of October 2000". UK Met Office. Retrieved 24 February 2012.
  10. ^ George P. Bancroft (April 2001). "North Atlantic Area—September through December 2000" (PDF). Mariners Weather Log. 45 (1): 23. Retrieved 9 March 2012.
  11. ^ a b c "Storm 29/30 oktober was 35e zware storm sinds 1910" (in Dutch). KNMI. Retrieved 24 February 2012.
  12. ^ "Tempête du 30 octobre 2000 en France" (in French). alertes-meteo.com. Retrieved 24 February 2012.
  13. ^ "Avis de tempête dans le nord de la France les rafales ont dépassé les 170 km par heure !" (in French). notre-planet.info. Retrieved 24 March 2012.
  14. ^ "Avis de tempête passée ou à venir sur la Belgique et ses voisins". lesoir.be. Retrieved 3 March 2012.
  15. ^ "Total Loss of the Italian Chemical Tanker Ievoli Sun in the English Channel" (PDF). Permanent Commission of Investigation into Accidents at Sea. Retrieved 24 March 2012.
  16. ^ "A few local pictures". leijnse-zouteland. Retrieved 23 March 2012.
  17. ^ a b "Zware storm trekt over Noordwest-Europa" (in Dutch). trouw.nl. Retrieved 23 March 2012.
  18. ^ "Zware storm teistert Nederland". NRC Handelsblad. Retrieved 26 February 2012.
  19. ^ de Jong, M. P. C.; L. H. Holthuijsen; Battjes, J. A. (2003). "Generation of seiches by cold fronts over the southern North Sea". Journal of Geophysical Research. 108(C4): 3117. Bibcode:2003JGRC..108.3117D. doi:10.1029/2002JC001422.
  20. ^ a b "Orkan-Alarm: Windstärke 12 über dem Norden" (in German). Welt.de. Retrieved 26 February 2012.
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