Hurricane Genevieve (2014)

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Map key
Saffir–Simpson scale
  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

The National Hurricane Center (NHC) began to monitor a tropical wave associated with a few showers and thunderstorms, moving westward off the coast of northern Central America on July 17. [1] Four days later, thunderstorm activity became more concentrated; [2] by July 22, the area of low-pressure became better organized. [3] On July 23, the NHC noted that the system could become a tropical depression within the next two days; [4] however, they also noted that wind shear could increase within a couple of days. [5] Following an increase of deep convection developing near the center as well as the collection of ASCAT data showing an area of tropical storm-force winds, the NHC upgraded the system to Tropical Storm Genevieve on July 25. [6] Shortly thereafter, the system attained its initial peak intensity of 45 mph (72 km/h). [7]

Tropical Storm Genevieve at its initial peak intensity on July 25 Genevieve 2014-07-25 2205Z.jpg
Tropical Storm Genevieve at its initial peak intensity on July 25

Shortly afterward, increased wind shear took its toll on the system, causing Genevieve to lose its organization as it continued westward, under the influence of a subtropical ridge and the Intertropical Convergence Zone. [8] After the low-level center of circulation was exposed and became separated from the deep convection, the NHC subsequently downgraded it to a tropical depression on July 26. [9] Although deep convection increased near the center early on the next day, Genevieve continued to battle westerly shear when crossing 140°W, moving into the waters monitored by the Central Pacific Hurricane Center (CPHC). [10] Due to the lack of deep convection, the CPHC indicated that Genevieve had become a remnant low early on July 28, as only a low-level cloud swirl remained. However, the CPHC noted the possibility of re-development since shear was forecast to decrease. [11]

Roughly 36 hours later, the remnants of Genevieve regenerated into a tropical depression to the southeast of the main Hawaiian Islands. [12] The system briefly became better organized on July 30, prompting the CPHC to forecast the storm would re-intensify into a tropical storm. [13] However, by the end of the day, the low-level circulation center had become displaced to the east of the deep convection due to increased southeasterly shear [14] and infiltration of dry air. [15] By 21:00 UTC July 31, the CPHC reported that Genevieve had once again degenerated to a remnant low, as only an isolated area of deep convection remained west of the center. [16]

Intensification and peak intensity

The remnants of Genevieve continued to travel in a generally westward direction, moving into an environment more conducive for tropical cyclogenesis, and on the afternoon of August 2, Genevieve regenerated into a tropical depression, as the storm reacquired deep convection and its upper-level outflow pattern improved. [17] By 21:00 UTC the same day, Genevieve reacquired tropical storm intensity, continuing to travel westward around the subtropical ridge to its north, [18] but only six hours later, the CPHC downgraded Genevieve into a tropical depression. [19] Deep convection near the center waxed and waned several times, but Genevieve failed to re-intensify. [20] After moving west-southwest, Genevieve turned west-northwest on August 4 as it continued to track around the ridge to its north. [21]

Despite moderate wind shear, convection soon wrapped around the southeastern side of the low-level circulation. [22] By 21:00 UTC on August 5, the CPHC upgraded the system to a tropical storm, despite continued wind shear. [23] Wind shear quickly decreased, triggering a period of rapid intensification. [24] By the afternoon of August 6, Genevieve intensified to a low-end Category 1 hurricane; the system also developed a central dense overcast and well-organized banding around the newly-developed eye. Traversing over very warm sea surface temperatures, [25] the intensification rate accelerated that evening. Based on advanced Dvorak technique estimates of 130 mph (210 km/h) as well as the presence of a very well-defined eye surrounded by very cold cloud tops, the CPHC upgraded the hurricane into Category 3 intensity on the Saffir-Simpson Hurricane Wind Scale early on the next day. [26]

Infrared loop of Genevieve after it crossed the International Date Line Genevieve 2014-08-07 1101-1732Z (infrared).gif
Infrared loop of Genevieve after it crossed the International Date Line

Genevieve crossed the International Date Line at 06:00 UTC on August 7, entering the area of responsibility of the RSMC Tokyo operated by the Japan Meteorological Agency (JMA). Thus, the JMA immediately recognized Genevieve as a typhoon with ten-minute maximum sustained winds at 115 mph (185 km/h). [27] The Joint Typhoon Warning Center (JTWC) also upgraded Genevieve to a super typhoon, based on the compact and symmetric ring of uniform convection embedded with a 14 mi (23 km) eye, as well as excellent poleward outflow into the strong tropical upper tropospheric trough (TUTT) positioned to the north and northeast. [28] Only six hours later, the JTWC reported that Genevieve had reached Category 5 status with one-minute sustained winds at 160 mph (260 km/h), when a microwave imagery revealed a 69 mi (111 km) diameter eyewall with a convective band over the south quadrant. [29] As Genevieve continued to remain in a favorable environment with radial outflow and low vertical wind shear, the JMA indicated that the typhoon about 760 mi (1,220 km) east-southeast of Wake Island had reached its peak intensity late on August 7, with ten-minute maximum sustained winds at 125 mph (201 km/h). [30]

Demise

During the morning of August 8, Genevieve started to track northward along the western periphery of a deep-layered subtropical ridge positioned to the east and northeast. Although the typhoon remained compact at noon, more fragmented deep convective banding revealed that Genevieve had begun a weakening trend. [31] As the result, the JTWC downgraded Genevieve to a typhoon late on the same day, due to warmer convection surrounding the system. [32] Early on August 9, Genevieve accelerated north-northeastward, and it began to encounter increasing vertical wind shear of 35 mph (56 km/h) with subsidence along the western periphery and weakening outflow into the TUTT. Therefore, the eye of the typhoon became cloud-filled, while the deepest convection around the core was also becoming warmer. [33] The system began to track north-northwestward in the afternoon, when the cold dense overcast has decreased in size and become less symmetric. [34]

Severe Tropical Storm Genevieve on August 11 Genevieve 2014-08-11 0130Z.jpg
Severe Tropical Storm Genevieve on August 11

Genevieve reformed a 17 mi (27 km) eye with more symmetric and organized convection for short time early on August 10, but the eye disappeared very soon as the system elongated more. [35] Upper-level analysis indicated a complex environment— an anticyclone located to the southeast, a TUTT cell to the west, and a second anticyclone to the north. The TUTT cell and the first anticyclone caused strong upper-level southwestern flow and moderate vertical wind shear over the system, but the issues were offset by the quick speed of the typhoon. [36] Tracking northwestward, Genevieve crossed 30°N at noon and began to encounter unfavorable sea surface temperatures less than 79 °F (26 °C). At the same time, a digging trough was expanding the region of subsidence which isolated the core from the tropical moisture along the equatorward periphery. [37] Later, deep convection along the tightly-wrapped low-level circulation center of the typhoon rapidly diminished as dry air surrounded the system. [38]

Late on August 10, the JMA downgraded Genevieve to a severe tropical storm about 670 mi (1,080 km) west-northwest of Midway Atoll, and the JTWC downgraded it to a tropical storm early on the next day. [39] [40] Dry air, cool ocean temperatures and a rapid weakening of the linkage to tropical moisture made deep convection over the storm almost completely dissipate. This process was hastened by the disintegration of the TUTT cell which had helped to enhance equatorward outflow. [41] Under the combination of many unfavorable environmental factors, the JMA downgraded the rapidly weakening system to a tropical storm, when it started to move west-northwestward and slowed down at noon. [42] Owing to diminished convection associated with a weak low-level circulation center, the JTWC issued its final warning and downgraded Genevieve to a tropical depression late on the same day. [43]

After the JMA downgraded Genevieve to a tropical depression at 06:00 UTC on August 12, the system drifted westward and then northwestward very slowly until it accelerated northeastward late on August 13. [44] [45] The JMA reported that Genevieve had dissipated as a tropical depression before noon on August 14; [46] [47] however, the Ocean Prediction Center indicated that this post-tropical cyclone crossed the International Date Line and entered the Central North Pacific Ocean again late on the same day. [48] The remnants of Genevieve were eventually absorbed by another extratropical cyclone before noon on August 15. [49] [50]

See also

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References

  1. ↑ Tropical Weather Discussion 1605 UTC Thu Jul 17 2014. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. July 17, 2014. Archived from the original on August 12, 2014. Retrieved August 6, 2014.
  2. ↑ Daniel Brown (July 21, 2014). Tropical Weather Outlook. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 6, 2014.
  3. ↑ Tropical Weather Outlook 11:00 pm PDT Tue Jul 22 2014. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. July 23, 2014. Archived from the original on August 12, 2014. Retrieved August 6, 2014.
  4. ↑ Eric S. Blake (July 23, 2014). Tropical Weather Outlook. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 6, 2014.
  5. ↑ Eric S. Blake (July 24, 2014). Tropical Weather Outlook. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 6, 2014.
  6. ↑ Robbie J. Berg (July 25, 2014). Tropical Storm Genevieve Discussion Number 1. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. Archived from the original on July 31, 2014. Retrieved August 6, 2014.
  7. ↑ Lixion A. Avila (July 25, 2014). Tropical Storm Genevieve Discussion Number 2. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 15, 2014.
  8. ↑ Robbie J. Berg (July 26, 2014). Tropical Storm Genevieve Discussion Number 5. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 7, 2014.
  9. ↑ Lixion A. Avila (July 26, 2014). Tropical Depression Genevieve Discussion Number 6. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 7, 2014.
  10. ↑ John P. Cangialosi (July 26, 2014). Tropical Depression Genevieve Discussion Number 9. National Hurricane Center (Report). Miami, Florida: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 7, 2014.
  11. ↑ Thomas Birchard (July 26, 2014). Post-Tropical Cyclone Genevieve Discussion Number 12. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 7, 2014.
  12. ↑ Robert Burke (July 29, 2014). Tropical Depression Genevieve Discussion Number 13. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 7, 2014.
  13. ↑ Jeffrey Powell; Chris Jacobson (July 30, 2014). Tropical Depression Genevieve Discussion Number 15. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Retrieved August 7, 2014.
  14. ↑ Robert Burke (July 30, 2014). Tropical Depression Genevieve Discussion Number 18. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 7, 2014.
  15. ↑ Sam Houston (July 31, 2014). Tropical Depression Genevieve Discussion Number 19. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 8, 2014.
  16. ↑ Robert Burke (July 31, 2014). Post-Tropical Cyclone Genevieve Discussion Number 21. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 8, 2014.
  17. ↑ Sam Houston (August 2, 2014). Tropical Depression Genevieve Discussion Number 22. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 8, 2014.
  18. ↑ Robert Burke (August 2, 2014). Tropical Storm Genevieve Discussion Number 23. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 8, 2014.
  19. ↑ Robert Burke (August 2, 2014). Tropical Depression Genevieve Discussion Number 24. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 8, 2014.
  20. ↑ Jeffrey Powell (August 3, 2014). Tropical Depression Genevieve Discussion Number 25. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 8, 2014.
  21. ↑ Chris Jacobson; Jeffrey Powell (August 4, 2014). Tropical Depression Genevieve Discussion Number 30. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 8, 2014.
  22. ↑ Kevin Kodama (August 4, 2014). Tropical Depression Genevieve Discussion Number 32. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 8, 2014.
  23. ↑ Robert Ballard (August 5, 2014). Tropical Storm Genevieve Discussion Number 35. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 12, 2014.
  24. ↑ Chris Jacobson; Sam Houston (August 6, 2014). Tropical Storm Genevieve Discussion Number 37. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on December 20, 2014. Retrieved August 12, 2014.
  25. ↑ Chris Jacobson; Sam Houston (August 6, 2014). Hurricane Genevieve Discussion Number 38. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 9, 2014. Retrieved August 12, 2014.
  26. ↑ Kevin Kodama (August 6, 2014). Hurricane Genevieve Discussion Number 40. Central Pacific Hurricane Center (Report). Honolulu, Hawaii: National Oceanic and Atmospheric Administration. Archived from the original on August 12, 2014. Retrieved August 12, 2014.
  27. ↑ "RSMC Tropical Cyclone Advisory 070600". Japan Meteorological Agency. Archived from the original on August 7, 2014. Retrieved August 15, 2014.
  28. ↑ "Prognostic Reasoning for Super Typhoon 11W [sic] (Genevieve) Warning Nr 41". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 8, 2014. Retrieved August 15, 2014.
  29. ↑ "Prognostic Reasoning for Super Typhoon 11W [sic] (Genevieve) Warning Nr 42". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 8, 2014. Retrieved August 15, 2014.
  30. ↑ "RSMC Tropical Cyclone Advisory 071800". Japan Meteorological Agency. Archived from the original on August 8, 2014. Retrieved August 15, 2014.
  31. ↑ "Prognostic Reasoning for Super Typhoon 07E (Genevieve) Warning Nr 46". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 10, 2014. Retrieved August 15, 2014.
  32. ↑ "Prognostic Reasoning for Typhoon 07E (Genevieve) Warning Nr 46". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 10, 2014. Retrieved August 15, 2014.
  33. ↑ "Prognostic Reasoning for Typhoon 07E (Genevieve) Warning Nr 49". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 10, 2014. Retrieved August 15, 2014.
  34. ↑ "Prognostic Reasoning for Typhoon 07E (Genevieve) Warning Nr 51". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 10, 2014. Retrieved August 15, 2014.
  35. ↑ "Prognostic Reasoning for Typhoon 07E (Genevieve) Warning Nr 52". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 10, 2014. Retrieved August 15, 2014.
  36. ↑ "Prognostic Reasoning for Typhoon 07E (Genevieve) Warning Nr 53". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 11, 2014. Retrieved August 15, 2014.
  37. ↑ "Prognostic Reasoning for Typhoon 07E (Genevieve) Warning Nr 54". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 11, 2014. Retrieved August 15, 2014.
  38. ↑ "Prognostic Reasoning for Typhoon 07E (Genevieve) Warning Nr 55". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 11, 2014. Retrieved August 15, 2014.
  39. ↑ "RSMC Tropical Cyclone Best Track Name 1413 Genevieve (1413)". Japan Meteorological Agency. Archived from the original on October 6, 2014. Retrieved September 30, 2014.
  40. ↑ "Tropical Storm 07E (Genevieve) Warning Nr 56". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 11, 2014. Retrieved August 15, 2014.
  41. ↑ "Prognostic Reasoning for Tropical Storm 07E (Genevieve) Warning Nr 58". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 12, 2014. Retrieved August 15, 2014.
  42. ↑ "RSMC Tropical Cyclone Advisory 111200". Japan Meteorological Agency. Archived from the original on August 12, 2014. Retrieved August 15, 2014.
  43. ↑ "Tropical Depression 07E (Genevieve) Warning Nr 59". Joint Typhoon Warning Center. United States Navy. Archived from the original on August 12, 2014. Retrieved August 15, 2014.
  44. ↑ "RSMC Tropical Cyclone Advisory 120600". Japan Meteorological Agency. Archived from the original on August 13, 2014. Retrieved August 15, 2014.
  45. ↑ "Marine Weather Warning for GMDSS Metarea XI 2014-08-13T18:00:00Z". WIS Portal – GISC Tokyo. Japan Meteorological Agency. Archived from the original on 2016-03-04. Retrieved 15 August 2014.
  46. ↑ "Marine Weather Warning for GMDSS Metarea XI 2014-08-14T06:00:00Z". WIS Portal – GISC Tokyo. Japan Meteorological Agency. Archived from the original on 2014-08-19. Retrieved 15 August 2014.
  47. ↑ "Marine Weather Warning for GMDSS Metarea XI 2014-08-14T12:00:00Z". WIS Portal – GISC Tokyo. Japan Meteorological Agency. Archived from the original on 2014-08-19. Retrieved 15 August 2014.
  48. ↑ "High Seas Forecast for METAREA XII 0545 UTC Fri Aug 15 2014". Ocean Prediction Center. Archived from the original on August 19, 2014. Retrieved August 15, 2014.
  49. ↑ "High Seas Forecast for METAREA XII 1145 UTC Fri Aug 15 2014". Ocean Prediction Center. Archived from the original on August 19, 2014. Retrieved August 15, 2014.
  50. ↑ "High Seas Forecast for METAREA XII 1745 UTC Fri Aug 15 2014". Ocean Prediction Center. Archived from the original on August 19, 2014. Retrieved August 15, 2014.
Hurricane Genevieve
Genevieve 2014-08-08 VIIRS.jpg
Genevieve at peak intensity on August 8
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