November 2014 Bering Sea cyclone

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Map key
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

Right after the JMA downgraded Nuri to a severe tropical storm at 00:00 UTC on November 6, the JTWC downgraded it to a tropical storm and issued its final warning for the system, due to Nuri's extratropical transition and diminishing deep convection. [7] [8] In the afternoon, Nuri accelerated northeastward and became completely extratropical east of Japan. [9] Due to an unusually powerful North Pacific jet stream, the extratropical cyclone underwent extremely explosive cyclogenesis on November 7, owing to the energy from differences in air masses. [10] The system split into two centers early on the same day, but the former center on the southwest was absorbed into the new center on the northeast, within half of a day. [5] [6]

Satellite loop of the extratropical cyclone nearing its peak intensity over the Bering Sea, on November 8 Bering Sea cyclone 2014-11-08 animation.gif
Satellite loop of the extratropical cyclone nearing its peak intensity over the Bering Sea, on November 8
Full view of the extratropical cyclone at its peak intensity, on November 8 November 2014 Bering Sea bomb cyclone peak, on November 8.png
Full view of the extratropical cyclone at its peak intensity, on November 8

After attaining typhoon-force winds at 70 knots (130 km/h; 80 mph), the new storm's central pressure decreased to 920  hPa (mbar; 27.17  inHg) early on November 8, becoming the most intense extratropical cyclone of the North Pacific Ocean since reliable records began. [1] The U.S. National Oceanic and Atmospheric Administration provided a slightly higher estimate of 924 mbar (hPa; 27.29 inHg), a pressure which still holds the record for most intense cyclone in the Bering Sea. [4] The extratropical cyclone crossed the International Date Line on November 9, at which time it started to weaken. However, the system's intensity shifted the jet stream far to the north of Alaska, resulting in a large mass of Arctic air invading the United States along and east of the Rocky Mountains, which caused the worst cold wave the United States had experienced since the Early 2014 North American cold wave. [2] [11] Early on the next day, the storm weakened further into a gale-force system and turned northward. [12] [13] On November 11, it turned northwestward, crossed the International Date Line for the second time, and weakened even further. [14] Afterwards, the system made a counter-clockwise loop and crossed the International Date Line for the third time, late on November 12. [15] The system eventually dissipated near the Aleutian Islands on November 13. [16] [17]

Impact

North America

A map of the extremely frigid temperatures in North America on November 17, 2014, caused by the cold wave brought about by Nuri's remnant Nov. 17 - 2014 North America Temperature Map.gif
A map of the extremely frigid temperatures in North America on November 17, 2014, caused by the cold wave brought about by Nuri's remnant

Sustained winds of 110 km/h (70 mph) with gusts to 156 km/h (97 mph) were recorded on the island of Shemya. [18] Only minor damage was reported on the island which houses a United States Air Force installation. [19]

The northward movement of the cyclone altered the jet stream, which allowed a fragment of the polar vortex to descend from the Arctic region into lower Canada and the Eastern United States, affecting up to 200 million people with colder-than-normal temperatures and early snowstorms. [20] [21] Some U.S. locations had temperatures 45 °F (25 °C) below normal. On November 10, St. Cloud, Minnesota had the biggest snowfall ever in November with 13.2 inches (34 cm). By the next day, Ishpeming, Michigan had 24.5 inches (62 cm), the most of any location. [22] On November 13, Casper, Wyoming had its lowest temperature ever recorded in November, with a record low of −27 °F (−33 °C), and Denver, Colorado had a low of −14 °F (−26 °C), the second coldest temperature ever recorded for that month. [23]

See also

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November 2014 Bering Sea cyclone
Post-Tropical Cyclone Nuri
Nov. 2014 bomb cyclone 2014-09-09 0210Z.jpg
The bomb cyclone at its peak intensity over the Bering Sea, on November 9, 2014