2013–2014 Atlantic winter storms in Europe
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File:NAtlanticwindspeedanomjan-feblrg.png
NOAA North Atlantic wind speed anomaly January–February 2014
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Type | Extratropical cyclones European windstorms |
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2013–2014 Atlantic winter storms in Europe were a series of winter storms affecting areas of Atlantic Europe and beyond. The French Atlantic coastal regions (chiefly Brittany), South West and Southern England, West Wales, Ireland, Spanish Atlantic coastal regions (particularly Galicia) were especially affected by a "conveyor belt" series of high-precipitation storms (mostly not exceptional for their winds) and by high tides. Many storms were explosively deepened by a strong jet stream, many deepening below 950 hPa. The repeated formation of large deep lows over the Atlantic brought storm surges and large waves which coincided with some of the highest astronomical tides of the year and caused coastal damage. The low pressure areas brought heavy rainfalls which led to flooding, which became most severe over parts of England such as at the Somerset Levels. The repeated storms fit into a pattern of disturbed weather in the Northern Hemisphere, which saw from November 2013 a disturbance to the jet stream in the western Pacific, which propagated eastwards bringing a warm winter to Alaska, drought to California, and repeated cold air outbreaks to the eastern USA where the 2013–14 North American cold wave resulted.
Contents
Autumn 2013
The end of October brought the St Jude storm, ranked within the top 10 most severe storms in the autumn across southern England in the last 40 years.[1] following the St. Jude storm a series of low pressure systems swept across western Europe bringing winds and rain, though not developing anywhere near as deeply as the St. Jude storm. A low named Godehard[Note 1] was the strongest of these low pressure areas and brought some disruption to Wales, with a gust of 89 miles per hour (143 km/h) recorded at Mumbles.[2] Storm-force winds left 10,000 homes without electricity in Wales on the first weekend of November 2013.[2] On 2 November the M4 Motorway was closed between Margam and Pyle due to the weather, and a roof canopy at the Princess of Wales Hospital Bridgend was damaged.[2] The old Severn Bridge on the M48 motorway was closed, with speed restrictions in place on the Second Severn Crossing. The M4 at Briton Ferry -where the motorway crosses the Neath- also saw speed restrictions and the Britannia Bridge to Anglesey and the Cleddau Bridge in Pembrokeshire also saw speed restrictions enacted. Natural Resources Wales warned of localised flooding with sea spray and overtopping of sea defences along the Pembrokeshire, Ceredigion and Newport coasts.[2] The low pressure also brought large waves to Aberystwyth which caused some disruption to seafront properties.[3]
November/December 2013
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Late November and early December saw an area of high pressure positioned to the west of Britain and Ireland, this directed the westerly path of weather systems moving over the Atlantic to the north of the UK, along which the storms developed before impacting across the Nordic countries. Lows moving to the north of the United Kingdom meant that November was fairly dry for the country.[1] December saw long periods of calm conditions in France also with dry and sunny weather predominating. A change in the weather regime began as active depressions brought strong rain and snowfall to the mountains towards the month end. Until December 13, France (and UK and Ireland) were protected by a powerful anticyclone stretched from the Maghreb to the British Isles, which deflected the Atlantic storm track north into Scandinavia.[4] The Nordic nations were affected by a series of storms, including Hilde (17 November),[5] Oskari (1 dec),[6] Xaver (5-7 Dec), Ivar (12 Dec)[5] and Zaki and Adam (14-15 Dec). Cyclone Xaver is predominantly known for the North sea storm surge of 5 December in the UK. The high pressure over Britain, Ireland and the Atlantic moved east during mid December, opening the way for areas of low pressure to reach western Europe. During mid-December a strong temperature gradient established over eastern North America (temperatures in New York 21 °C, Montreal -7 °C), which enhanced the jetstream in the North Atlantic.[7][8] The lows moved under this powerful jet stream where they explosively deepened before reaching Western Europe.[9]
Christmas and New Year storms
Bernd (18-19 December)
File:BerndDec2013.jpg | |
Formed | 17 December 2013 |
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Dissipated | 21 December 2013 |
Lowest pressure | 947 hectopascals (28.0 inHg)[10] |
The first storm of this period was named Bernd,[Note 1] it was also given the name Emily after Emily Brontë the author, who died on December 19 165 years ago, and who wrote Wuthering Heights which featured constant stormy weather by some press.[11][12][13] Met Eireann issued red warnings for wind at 9:00am 18 December to Donegal, Galway, Leitrim, Mayo and Sligo.[13] The UK Met Office issued orange warnings for the Highlands, Western Isles, Strathclyde and Northern Ireland.[14]
UK Met Office maximum hourly gust speed 18 Dec 1800 – 19 Dec 0700 .[15] | |||
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Site | Area | Elevation (m) | Max gust speed |
Needles Old Battery | Isle of Wight | 80 | 94 miles per hour (151 km/h) |
South Uist Range | Western Isles | 4 | 90 miles per hour (140 km/h) |
Tiree | Argyll | 9 | 87 miles per hour (140 km/h) |
Plymouth, Mountbatten | Devon | 50 | 85 miles per hour (137 km/h) |
Castlederg | Tyrone | 49 | 84 miles per hour (135 km/h) |
Pembrey Sands | Dyfed | 3 | 82 miles per hour (132 km/h) |
Capel Curig | Gwynedd | 216 | 81 miles per hour (130 km/h) |
Stornoway Airport | Western Isles | 15 | 77 miles per hour (124 km/h) |
Altnaharra | Sutherland | 81 | 77 miles per hour (124 km/h) |
Fair Isle | Shetland | 57 | 76 miles per hour (122 km/h) |
UK Met Office 24 Hour Rainfall Totals 18 Dec 0700 – 19 Dec 0700, 2013.[15] | ||
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Site | Area | Precipitation (mm) |
Tredegar | Gwent | 38.4 |
Cardinham, Bodmin | Cornwall | 35 |
Whitechurch | Dyfed | 34.4 |
Tyndrum | Perthshire | 32.2 |
Libanus | Powys | 30.8 |
Shap | Cumbria | 30.6 |
Okehampton | Devon | 30.6 |
Keswick | Cumbria | 28.8 |
Tulloch Bridge | Inverness-shire | 27 |
Bala | Gwynedd | 26.4 |
Dirk (23-24 December)
Formed | December 21 |
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Dissipated | December 28 |
Lowest pressure | 929 hectopascals (27.4 inHg) |
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Notes
- ^ Naming conventions (where possible) follow those adopted by the Free University of Berlin's adopt a vortex scheme. Names from other sources referenced in article.
References
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External links
- House of Commons Environment, Food and Rural Affairs Committee Winter floods 2013–14
- Met Office and Centre for Ecology and Hydrology: The Recent Storms and Floods in the UK, February 9 2014.
- Met Office: Marine weather analysis - December 2013 & January 2014
- Environment Agency report
- Met Eireann: What’s up with the Weather this winter? Aidan Murphy 14 February 2014.
- Met Eireann: Winter 2013/2014, 3 March 2014
- Environment Agency Flickr Galleries:
Wikimedia Commons has media related to Northern Atlantic cyclones. |