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Hurricane Shary

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Hurricane Shary
Category 1 hurricane (SSHWS/NWS)
Shary near peak intensity
FormedOctober 28, 2010
DissipatedOctober 30, 2010
Highest winds1-minute sustained: 75 mph (120 km/h)
Lowest pressure989 mbar (hPa); 29.21 inHg
FatalitiesNone
DamageMinimal
Areas affectedBermuda
Part of the 2010 Atlantic hurricane season

Hurricane Shary was a short-lived tropical cyclone that eventually strengthened into the eleventh hurricane of the unusually active 2010 Atlantic hurricane season. Shary originated from a weak area of convection associated with an upper-level trough located about 350 miles (565 km) southeast of Bermuda in late October. Initially not expected to exceed winds of 50 mph (85 km/h), Shary defied predictions and was upgraded to a minimal hurricane on October 30, moving well to the east of Bermuda. Unfavorable surroundings subsequently kicked in, and Shary began to lose its tropical characteristics. Later that day, Shary degenerated into a post-tropical cyclone, and the final advisory by the National Hurricane Center was issued.

Meteorological history

Storm path

In late October, the National Hurricane Center (NHC) began to monitor an area of disorganized weather in association with a deep-layered surface trough located northeast of the northern Leeward Islands. Supported by an upper-level low retrograding to its southwest, the system generated moderate clusters of scattered showers and isolated thunderstorms. Convection enhanced as environmental conditions within its encounter became more favorable over time. Around 1600 UTC October 28, satellite imagery showed what appeared to be the formation of a surface low. Shower and thunderstorm activity increased accordingly, and the NHC gave the system a high chance of developing into a tropical or subtropical cyclone. At the time, the center of circulation remained poor; however, it became better defined later that day, with a stable amount of corresponding convection persisting. In addition, a surface buoy reported peak winds of 38 mph (61 km/h) at both 0000 UTC and 0200 UTC the next day. Although the upper low had remained adjacent, it was located well to the southwest of the considerably small associated wind radius — not quite a subtropical structure. The system was therefore designated as Tropical Storm Shary south of Bermuda, steered toward the northwest between the upper low and a mid-level ridge to its northeast. The NHC also noted that Shary would be a relatively short-lived tropical cyclone due to a forecast merge with a cold front to the north.

Tropical Storm Shary approaching Bermuda

During the morning, storm cloud patterns became less distorted while Shary continued to separate from the upper-level low. Although the center remained partially exposed, convection deepened significantly within the western semicircle over the next hours. However, moderate northerly shear was subsequently created on the system due to the relocation of the upper low; forward speed decreased considerably, and inner-core convection shifted to the south. Additionally, dry air began to wrap into the eastern and northeastern quadrants, resulting in some convective erosion and intensification halting. Although the storm was expected to only strengthen slightly in response to marginally improved upper-level conditions, several forecast models showed Shary becoming a hurricane, which at the time the NHC regarded as "highly unlikely given the very strong shear forecast at that time." Nevertheless, data from a Hurricane Hunters flight revealed an increase in maximum wind speeds; later that day, deep convection reignited, quickly expanding over eastern portions of the cyclone. During the overnight hours, convective activity further grew and deepened symmetrically near the center, supported by the development of a small eye feature as seen on microwave imagery. Although Dvorak classifications were far from supporting such intensity, the system was upgraded to a Category 1 hurricane on October 30 with winds set at 75 mph (120 km/h) — a case which the NHC described as a case of a small hurricane that would not have been observed before the invention of microwave satellite imagery. Upon reaching this intensity, Shary was accelerating considerably, resulting in a rapid northeastward motion across the Atlantic.

Located just to the east of a strong cold front, the minimal hurricane continued to speed over progressively cooler waters. As such, Shary gradually lost its convective symmetry, though the small eye remained distinguishable in further microwave observation. Within moments, rapid interaction with the front began to take place, suggesting the system was finally entering an extratropical transition. Subsequent data from cyclone phase space diagrams indicated Shary had become post-tropical about 530 miles (885 km) south-southeast of Cape Race, and the NHC discontinued advisories. Early on October 31, the extratropical remnants of Hurricane Shary were completely absorbed by the same neighboring system.

Preparations and impact

Immediately following the first advisory on Tropical Storm Shary on October 28, the Government of Bermuda issued a tropical storm warning for the entire island. In response to the presence of Shary, Jet Blue canceled flights from the United States to Bermuda. The Causeway, a low-lying bridge that connects St. David's Island to the mainland, was to be shut down at 7:00 p.m. local time on October 29. Ferry service between Hamilton Parish and St. George's Island was temporarily suspended. Residents were also urged to secure their boats as a safety precaution. The tropical storm warning was later canceled during the evening of October 29 as Shary no longer posed a threat to Bermuda. Since Shary turned away from Bermuda before directly striking the island, its effects were limited. Only 0.54 in (14 mm) of rain fell during the storms' passage and wind gusts reached 35 mph (55 km/h).

See also

References

  1. "Graphical Tropical Weather Outlook". National Hurricane Center. October 27, 2010. Retrieved October 30, 2010.
  2. "Graphical Tropical Weather Outlook". National Hurricane Center. October 27, 2010. Retrieved October 30, 2010.
  3. "Graphical Tropical Weather Outlook". National Hurricane Center. October 28, 2010. Retrieved October 30, 2010.
  4. "Graphical Tropical Weather Outlook". National Hurricane Center. October 28, 2010. Retrieved October 30, 2010.
  5. ^ Brown & Berg (October 29, 2010). "Tropical Storm Shary Discussion One". National Hurricane Center. Retrieved October 30, 2010.
  6. ^ Brown & Berg (2010). "Tropical Storm Shary Public Advisory One". National Hurricane Center. Retrieved October 30, 2010.
  7. Blake & Brennan (October 29, 2010). "Tropical Storm Shary Discussion Two". National Hurricane Center. Retrieved October 30, 2010.
  8. Stewart (October 29, 2010). "Tropical Storm Shary Discussion Three". National Hurricane Center. Retrieved October 30, 2010.
  9. Roberts & Brown (October 29, 2010). "Tropical Storm Shary Discussion Five". National Hurricane Center. Retrieved October 30, 2010.
  10. Blake (October 30, 2010). "Tropical Storm Shary Discussion Six". National Hurricane Center. Retrieved October 30, 2010.
  11. Cangialosi (October 30, 2010). "Tropical Storm Shary Discussion Six". National Hurricane Center. Retrieved October 30, 2010.
  12. Cangialosi (October 30, 2010). "Tropical Storm Shary Discussion Eight". National Hurricane Center. Retrieved October 30, 2010.
  13. Staff Writer (October 29, 2010). "Flights and ferry service canceled as Tropical Storm Shary heads for Bermuda". Go Jamaica. Retrieved October 30, 2010.
  14. Elizabeth Roberts (October 29, 2010). "Tropical Storm Shary approaches Bermuda". The Houston Chronicle. Retrieved October 30, 2010.
  15. Roberts & Brown (October 29, 2010). "Tropical Storm Shary Public Advisory Five". National Hurricane Center. Retrieved October 30, 2010.
  16. "Daily Climatology Written Summary: October 1, 2010 to October 29, 2010". Bermuda Weather Service. October 30, 2010. Retrieved October 30, 2010.

External links

Tropical cyclones of the 2010 Atlantic hurricane season
2Alex TDTwo TSBonnie TSColin TDFive 4Danielle 4Earl TSFiona TSGaston TSHermine 4Igor 4Julia 3Karl 1Lisa TSMatthew TSNicole 1Otto 2Paula 2Richard 1Shary 2Tomas
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