「連続猛暑日」過去タイ記録も、まだ甘い! 最低気温が30度超の「超熱帯夜」がくるかも!?

2013年の夏は、7月上旬から全国的に猛烈な暑さとなり、先週には東京で過去タイ記録となる4日連続の猛暑日、山梨県甲州市では4日連続で39度以上、群馬県館林市では39.5度を記録。文字通りの記録的な猛暑となっている。

昼がいくら暑くても、夜の気温さえ下がれば、少しは過ごしやすいものだが、なかなかそうはうまくいかないのが近年の猛暑の特徴。今年の夏も、東京ではすでに7月6日から9日連続で熱帯夜を継続したが、過去には国内で「最低気温が真夏日(=30度以上)超え」という"超熱帯夜"が記録されたことがある。
画像:Yahoo!天気・災害より
気象庁は公式サイトで、天気予報や現在の降水、風速、気温の状況のほか、気象に関するこれまでの様々な記録を掲載している。そちらを見てみると、「最高気温 40.9度(埼玉県熊谷市、岐阜県多治見市 2007年8月16日)」という記憶にも新しい記録や、「最低気温 -41.0度(北海道旭川市 1902年1月25日)」というこれまた凄まじい数字のほか、「最低気温の最高記録」という欄も存在。それによると「最低気温が30度以上」という"超熱帯夜"は、

新潟県糸魚川 30.8度 1990年8月22日
石川県小松 30.3度 2000年7月31日
富山県上市 30.2度 1997年8月9日
富山県富山 30.1度 2000年7月31日
福井県越廼 30.0度 2000年7月31日

の都合5回記録されている。

これらの記録が日本海側の北陸地方に集中しているのは、同地域では、フェーン現象の影響により、夜間でも気温が下がらないケースがあるからだが、04年には東京でも最低気温が29.6度を記録している。

07年から気象庁は、最高気温35度以上の日を「猛暑日」と呼び始めたが、07年並の猛暑が続く2013年、都心部で「最低気温30度超え」が記録されれば、新たに"超熱帯夜"という単語が認定されるかもしれない。

【参照リンク】
・歴代全国ランキング-気象庁
http://www.data.jma.go.jp/obd/stats/etrn/view/rankall.php

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Puffin

SEAHOUSES, ENGLAND - JUNE 24:  A Puffin returns to it's nest on a cliff top on June 24, 2011 on Inner Farne, England. The Farne Islands, which are run by the National Trust, are situated two to three miles off the Northumberland coastline. The archipeligo of 16-28 separate islands (depending on the tide) make the summer home to approximately 100,000 pairs of breeding seabirds including around 36,000 Puffins, 32,000 Guillemots and 2,000 pairs of Arctic Terns. The species of birds which nest in internationally important numbers include Shag, Sandwich Tern and Arctic Tern. The coastline around The Farnes are also the breeding ground to one of Europe's largest Grey Seal colonies with around 4,000 adults giving birth to 1500 pups every year.

SKOMER ISLAND, UNITED KINGDOM - JULY 20:  An adult Puffin flaps its wings on Skomer Island on July 20, 2010 in Pembrokeshire, Wales. The island which has the biggest Puffin colony in Southern Britain plays host to over 10,000 Puffins, who come from April to the end of July to breed. The small island, off the coast of southwest Wales and managed by the Wildlife Trust of South and West Wales, is one of the most important and accessible seabird breeding sites in Europe and has become a Mecca for wildlife and bird lovers. As well as the Puffins the island is also home to a large breeding seabird population, including Manx Shearwaters, Guillemots, and Razorbills as well as birds of prey including Owls, Kestrels and Falcons. As a result Skomer is a National Nature Reserve, a Site of Special Scientific Interest and a Special Protection Area. Much of Skomer has also been designated an Ancient Monument and it is also surrounded by a Marine Nature Reserve.

SKOMER ISLAND, UNITED KINGDOM - JULY 20:  An adult Puffin watches from the cliff tops on Skomer Island on July 20, 2010 in Pembrokeshire, Wales. The island which has the biggest Puffin colony in Southern Britain plays host to over 10,000 Puffins, who come from April to the end of July to breed. The small island, off the coast of southwest Wales and managed by the Wildlife Trust of South and West Wales, is one of the most important and accessible seabird breeding sites in Europe and has become a Mecca for wildlife and bird lovers. As well as the Puffins the island is also home to a large breeding seabird population, including Manx Shearwaters, Guillemots, and Razorbills as well as birds of prey including Owls, Kestrels and Falcons. As a result Skomer is a National Nature Reserve, a Site of Special Scientific Interest and a Special Protection Area. Much of Skomer has also been designated an Ancient Monument and it is also surrounded by a Marine Nature Reserve.

SKOMER ISLAND, UNITED KINGDOM - JULY 20:  An adult Puffin watches from the cliff tops on Skomer Island on July 20, 2010 in Pembrokeshire, Wales. The island which has the biggest Puffin colony in Southern Britain plays host to over 10,000 Puffins, who come from April to the end of July to breed. The small island, off the coast of southwest Wales and managed by the Wildlife Trust of South and West Wales, is one of the most important and accessible seabird breeding sites in Europe and has become a Mecca for wildlife and bird lovers. As well as the Puffins the island is also home to a large breeding seabird population, including Manx Shearwaters, Guillemots, and Razorbills as well as birds of prey including Owls, Kestrels and Falcons. As a result Skomer is a National Nature Reserve, a Site of Special Scientific Interest and a Special Protection Area. Much of Skomer has also been designated an Ancient Monument and it is also surrounded by a Marine Nature Reserve.

SKOMER ISLAND, UNITED KINGDOM - JULY 20:  An adult Puffin watches from the cliff tops on Skomer Island on July 20, 2010 in Pembrokeshire, Wales. The island which has the biggest Puffin colony in Southern Britain plays host to over 10,000 Puffins, who come from April to the end of July to breed. The small island, off the coast of southwest Wales and managed by the Wildlife Trust of South and West Wales, is one of the most important and accessible seabird breeding sites in Europe and has become a Mecca for wildlife and bird lovers. As well as the Puffins the island is also home to a large breeding seabird population, including Manx Shearwaters, Guillemots, and Razorbills as well as birds of prey including Owls, Kestrels and Falcons. As a result Skomer is a National Nature Reserve, a Site of Special Scientific Interest and a Special Protection Area. Much of Skomer has also been designated an Ancient Monument and it is also surrounded by a Marine Nature Reserve.

SKOMER ISLAND, UNITED KINGDOM - JULY 20:  An adult Puffin watches from the cliff tops on Skomer Island on July 20, 2010 in Pembrokeshire, Wales. The island which has the biggest Puffin colony in Southern Britain plays host to over 10,000 Puffins, who come from April to the end of July to breed. The small island, off the coast of southwest Wales and managed by the Wildlife Trust of South and West Wales, is one of the most important and accessible seabird breeding sites in Europe and has become a Mecca for wildlife and bird lovers. As well as the Puffins the island is also home to a large breeding seabird population, including Manx Shearwaters, Guillemots, and Razorbills as well as birds of prey including Owls, Kestrels and Falcons. As a result Skomer is a National Nature Reserve, a Site of Special Scientific Interest and a Special Protection Area. Much of Skomer has also been designated an Ancient Monument and it is also surrounded by a Marine Nature Reserve.

SKOMER ISLAND, UNITED KINGDOM - JULY 20:  An adult Puffin enters a burrow holding sandeels in its beak to feed its cheeks on Skomer Island on July 20, 2010 in Pembrokeshire, Wales. The island which has the biggest Puffin colony in Southern Britain plays host to over 10,000 Puffins, who come from April to the end of July to breed. The small island, off the coast of southwest Wales and managed by the Wildlife Trust of South and West Wales, is one of the most important and accessible seabird breeding sites in Europe and has become a Mecca for wildlife and bird lovers. As well as the Puffins the island is also home to a large breeding seabird population, including Manx Shearwaters, Guillemots, and Razorbills as well as birds of prey including Owls, Kestrels and Falcons. As a result Skomer is a National Nature Reserve, a Site of Special Scientific Interest and a Special Protection Area. Much of Skomer has also been designated an Ancient Monument and it is also surrounded by a Marine Nature Reserve.

SKOMER ISLAND, UNITED KINGDOM - JULY 20:  An adult Puffin watches from the cliff tops on Skomer Island on July 20, 2010 in Pembrokeshire, Wales. The island which has the biggest Puffin colony in Southern Britain plays host to over 10,000 Puffins, who come from April to the end of July to breed. The small island, off the coast of southwest Wales and managed by the Wildlife Trust of South and West Wales, is one of the most important and accessible seabird breeding sites in Europe and has become a Mecca for wildlife and bird lovers. As well as the Puffins the island is also home to a large breeding seabird population, including Manx Shearwaters, Guillemots, and Razorbills as well as birds of prey including Owls, Kestrels and Falcons. As a result Skomer is a National Nature Reserve, a Site of Special Scientific Interest and a Special Protection Area. Much of Skomer has also been designated an Ancient Monument and it is also surrounded by a Marine Nature Reserve.

SKOMER ISLAND, UNITED KINGDOM - JULY 20:  An adult Puffin prepares to enter a burrow holding sandeels in its beak to feed its chicks on Skomer Island on July 20, 2010 in Pembrokeshire, Wales. The island which has the biggest Puffin colony in Southern Britain plays host to over 10,000 Puffins, who come from April to the end of July to breed. The small island, off the coast of southwest Wales and managed by the Wildlife Trust of South and West Wales, is one of the most important and accessible seabird breeding sites in Europe and has become a Mecca for wildlife and bird lovers. As well as the Puffins the island is also home to a large breeding seabird population, including Manx Shearwaters, Guillemots, and Razorbills as well as birds of prey including Owls, Kestrels and Falcons. As a result Skomer is a National Nature Reserve, a Site of Special Scientific Interest and a Special Protection Area. Much of Skomer has also been designated an Ancient Monument and it is also surrounded by a Marine Nature Reserve.

SKOMER ISLAND, UNITED KINGDOM - JULY 20:  An adult Puffin prepares to enter a burrow holding sandeels in its beak to feed its chicks on Skomer Island on July 20, 2010 in Pembrokeshire, Wales. The island which has the biggest Puffin colony in Southern Britain plays host to over 10,000 Puffins, who come from April to the end of July to breed. The small island, off the coast of southwest Wales and managed by the Wildlife Trust of South and West Wales, is one of the most important and accessible seabird breeding sites in Europe and has become a Mecca for wildlife and bird lovers. As well as the Puffins the island is also home to a large breeding seabird population, including Manx Shearwaters, Guillemots, and Razorbills as well as birds of prey including Owls, Kestrels and Falcons. As a result Skomer is a National Nature Reserve, a Site of Special Scientific Interest and a Special Protection Area. Much of Skomer has also been designated an Ancient Monument and it is also surrounded by a Marine Nature Reserve.

SEAHOUSES, ENGLAND - JUNE 25:  A Puffin returns to it's nest with a beak full of sand eels on June 25, 2011 on Inner Farne, England. The Farne Islands, which are run by the National Trust, are situated two to three miles off the Northumberland coastline. The archipeligo of 16-28 separate islands (depending on the tide) make the summer home to approximately 100,000 pairs of breeding seabirds including around 36,000 Puffins, 32,000 Guillemots and 2,000 pairs of Arctic Terns. The species of birds which nest in internationally important numbers include Shag, Sandwich Tern and Arctic Tern. The coastline around The Farnes are also the breeding ground to one of Europe's largest Grey Seal colonies with around 4,000 adults giving birth to 1500 pups every year.

SEAHOUSES, ENGLAND - JUNE 24:  A Puffin stands near it's burrow on a cliff top on June 24, 2011 on Inner Farne, England. The Farne Islands, which are run by the National Trust, are situated two to three miles off the Northumberland coastline. The archipeligo of 16-28 separate islands (depending on the tide) make the summer home to approximately 100,000 pairs of breeding seabirds including around 36,000 Puffins, 32,000 Guillemots and 2,000 pairs of Arctic Terns. The species of birds which nest in internationally important numbers include Shag, Sandwich Tern and Arctic Tern. The coastline around The Farnes are also the breeding ground to one of Europe's largest Grey Seal colonies with around 4,000 adults giving birth to 1500 pups every year.

SEAHOUSES, ENGLAND - JUNE 24:  A Puffin stands on a cliff top on June 24, 2011 on Inner Farne, England. The Farne Islands, which are run by the National Trust, are situated two to three miles off the Northumberland coastline. The archipeligo of 16-28 separate islands (depending on the tide) make the summer home to approximately 100,000 pairs of breeding seabirds including around 36,000 Puffins, 32,000 Guillemots and 2,000 pairs of Arctic Terns. The species of birds which nest in internationally important numbers include Shag, Sandwich Tern and Arctic Tern. The coastline around The Farnes are also the breeding ground to one of Europe's largest Grey Seal colonies with around 4,000 adults giving birth to 1500 pups every year.

SEAHOUSES, ENGLAND - JUNE 24:  Puffins stands on a cliff top on June 24, 2011 on Inner Farne, England. The Farne Islands, which are run by the National Trust, are situated two to three miles off the Northumberland coastline. The archipeligo of 16-28 separate islands (depending on the tide) make the summer home to approximately 100,000 pairs of breeding seabirds including around 36,000 Puffins, 32,000 Guillemots and 2,000 pairs of Arctic Terns. The species of birds which nest in internationally important numbers include Shag, Sandwich Tern and Arctic Tern. The coastline around The Farnes are also the breeding ground to one of Europe's largest Grey Seal colonies with around 4,000 adults giving birth to 1500 pups every year.

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