Hurricane Daniel (2006)

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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

Hurricane Daniel began as a tropical wave that moved off the west coast of Africa on July 2. The wave moved across the Atlantic Ocean and Caribbean Sea with little associated convection, and on July 12, it crossed Central America into the eastern Pacific Ocean. Convection increased on July 13, and two days later the system began to exhibit signs of tropical development to the south of Mexico. [1] It tracked westward at about 15 mph (25 km/h), and on July 16, the disturbance became better organized. [2] With convective rainbands near an associated low-level circulation, [3] it is estimated the tropical wave spawned a tropical depression late on July 16. At the time, it was located about 525 miles (845 km) south-southwest of Manzanillo, Colima. [1]

Classified as Tropical Depression Five-E, the system tracked westward under the steering currents of a mid-level ridge. [3] In the hours after formation, the depression lacked a concentration of deep convection near the center. Conditions favored development, including warm sea surface temperatures, very low amounts of wind shear, and an established anticyclone over the cyclone. [4] Convection became more centralized, coinciding with the improvement of upper-level outflow. Based on Dvorak classifications, it is estimated that the cyclone intensified into Tropical Storm Daniel at 12:00  UTC on July 17. [5] Daniel quickly became better organized, exhibiting increased thunderstorm activity and banding features. [6] A central dense overcast developed, and a well-defined rainband wrapped around the center of circulation. [7] Based on the formation of an eye feature, [8] the National Hurricane Center upgraded Daniel to hurricane status late on July 18 while it was located about 885 miles (1420 km) south-southwest of Cabo San Lucas. [1]

Satellite loop of Hurricane Daniel near peak intensity. Danielpeakrgb.gif
Satellite loop of Hurricane Daniel near peak intensity.

On July 19, the eye of Daniel became apparent on satellite imagery, [9] which organized into a pinhole eye. [10] It underwent an eyewall replacement cycle as it turned to the west-northwest, temporarily halting its intensification trend, before quickly strengthening and attaining major hurricane status on July 20. [1] Later that day, Hurricane Daniel organized into a very symmetric cyclone with a distinct eye about 30 miles (45 km) in diameter. Upon attaining Category 4 status on the Saffir-Simpson Hurricane Scale, the cyclone resembled the appearance of an annular hurricane; [11] an annular hurricane is one with a large and symmetric eye, surrounded by a thick ring of intense convection, and usually is able to maintain its intensity and structure for several days. [12] On July 21 the hurricane underwent another eyewall replacement cycle. After completing the cycle, Daniel attained its peak winds of 150 mph (240 km/h) early on July 22. It maintained peak winds for about 18 hours, and Daniel began a weakening trend as it crossed into an area of progressively cooler water temperatures. [1] The eye became more distinct on July 23, [13] before the cloud tops again warmed as the winds decreased. [14]

The hurricane crossed into the area of forecast responsibility of the Central Pacific Hurricane Center on July 24, [1] and upon doing so, its eye disappeared from satellite imagery. Daniel was forecast to track through the Hawaiian Islands as a tropical storm as water temperatures near the islands were warmer, [15] and wind shear was expected to be minimal. [16] However, it decelerated as the ridge to its north weakened, and due to the combination of cool waters and increasing easterly shear, Daniel weakened to a tropical storm on July 25. [1] Later that day, no active convection remained near the exposed circulation center, and early on July 26, it weakened to tropical depression status. Thunderstorm activity failed to redevelop, and Daniel degenerated into a remnant low-pressure area by 00:00  UTC on July 27. The remnant low continued west-northwestward, dissipating just southeast of the Big Island of Hawaii on July 28. [16]

Preparations and impact

Satellite image of the remnants of Daniel near Hawaii on July 28. TD Daniel (2006).JPG
Satellite image of the remnants of Daniel near Hawaii on July 28.

When Hurricane Daniel was forecast to pass through the Hawaiian islands as a tropical storm, state and Hawaii County officials recommended residents prepare hurricane kits. They also suggested purchasing non-perishable foods and batteries. Initially, the storm was several days away from potentially affecting the state, and as a result, few residents rushed to prepare. [17] The Honolulu National Weather Service issued a high surf advisory for east facing beaches in Hawaii, and warned beachgoers to remain out of the water. [18] The National Weather Service issued a flash flood watch and wind advisory in association with the remnants of Daniel. [19]

The remnants produced 2–5 inches (50–125 mm) of rainfall throughout windward areas of the Big Island of Hawaii and Maui on July 28 and 29. [16] West Wailuaiki on Maui recorded 3.87 inches (98.3 mm) in one day, which was the highest daily rainfall total from the hurricane. [20] The storm also dropped precipitation on the East Maui watershed. [21] The rainfall particularly in Kailua-Kona on the Big Island caused ponding on roadways, as well as flooding of small streams. However, no injuries or serious damage were reported. [22] A station in Ka Lae briefly reported sustained winds of about 35 mph (56 km/h) with gusts to 45 mph (72 km/h). [16]

During the 61st Interdepartmental Hurricane Conference, the Hawaii State Civil Defense requested the retirement of the name Daniel, citing that it became one of the several storms memorable for threat or damage. [23] However, the World Meteorological Organization did not approve the request. [24]

See also

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References

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Hurricane Daniel
Hurricane daniel 2006.jpg
Hurricane Daniel near peak intensity on July 21