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Hurricane Daniel (04E) Weakens to Tropical Depression

15.2N 144.3W

July 11th, 2012 Category: Tropical Storms

Tropical Depression Daniel – July 11th, 2012

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Track of 04E - July 7th, 2012 © Univ. of Wisconsin

Track of TS 04E

Overnight July 7 to July 8, Hurricane Daniel (04E) rapidly intensified further into a Category 2 hurricane with sustained winds of 105 mph (165 km/h).

Later that day, Daniel reached a peak intensity of 115 mph and a central pressure of 961 millibars, a Category 3 hurricane, although the eye was already over cooler waters. However, Daniel maintained Category 3 status briefly, and six hours later, the eye became less well-defined and the storm weakened back to a Category 2 hurricane. By July 9, Daniel had weakened further to a Category 1. Early on July 10, Daniel continued to weakened into a tropical storm, as the system became smaller in size, over cooler waters.

On July 11, Daniel’s low level circulation center started to became exposed under moderate vertical wind shear. It further weakened into a tropical depression later that day and then degenerated into a remnant low east-southeast of Hawaii. The storm in this last phase can be observed here in these images.

Hurricane Daniel (04E) Southwest of Southern Tip of Baja California

18.2N 114.1W

July 7th, 2012 Category: Tropical Storms

Hurricane Daniel – July 7th, 2012

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Track of 04E - July 7th, 2012 © Univ. of Wisconsin

Track of TS 04E

Early on July 2, the National Hurricane Center began monitoring an area of disturbed weather, and its associated broad area of low pressure, about 475 mi (764 km) south-southeast of Acapulco, Mexico.

Over the next 24 hours, the disturbance continued to become increasingly better organized, and a Tropical Cyclone Formation Alert was issued on the system early on July 3. By early on July 4, the system had gained enough organization to be declared as Tropical Depression Four-E. On July 5th, Four-E became Tropical Storm Daniel.

The cyclone is currently slowly intensifying, and after having been situated over a favorable environment for two days, intensified into a hurricane. Late on July 7, Daniel rapidly intensified into a Category 2 hurricane with sustained winds of 105 mph and a central pressure of 969 mbar.

As of 8 p.m. PDT (0300 UTC July 8) July 7, Hurricane Daniel is located within 20 nautical miles of 14.9°N 121.2°W, about 920 mi (1485 km) southwest of the southern tip of Baja California. Maximum sustained winds are 90 knots (105 mph, 165 km/h), with stronger gusts. Minimum central pressure is 969 mbar (hPa; 28.61 InHg), and the system is moving west at 12 kt (14 mph, 22 km/h). Hurricane force winds extend up to 30 miles (45 km) from the center of Daniel, and tropical storm force winds up to 115 miles (185 km) from the center.

Emilia (05E) Weakens From Category 4 Hurricane to Tropical Storm

14.3N 130.3W

July 14th, 2012 Category: Tropical Storms

Tropical Storm Emilia – July 12th, 2012

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Track of 05E - July 13th, 2012 © Univ. of Wisconsin

Track of TS 05E

Emilia (05E) reached hurricane status early on July 9 and began to rapidly intensify into a Category 3 hurricane as the eastern outflow channel from Daniel (04E) that had previously inhibited development weakened and allowed Emilia to ventilate its core in all directions.

Early on July 10, Emilia reached its peak intensity as a Category 4 hurricane with sustained winds of 140 mph and a barometric pressure of 945 mbar. After its peak, Emilia began to fluctuate between a strong Category 2 hurricane and a weak Category 3 hurricane. Although the storm was over cool waters, it was able to maintain this intensity because of its annular structure.

However, late on July 12, the eye disappeared from satellite imagery and the storm weakened to a Category 1 hurricane. Early the next morning, it was observed that Emilia passed just north of Daniel’s path days earlier, which was a hostile environment. In response to this, the storm dropped to below hurricane status.

As of 8 p.m. PDT July 13 (0300 UTC July 14), Tropical Storm Emilia is located within 20 nautical miles of 15.5°N 128.6°W, about 1320 mi (2125 km) west-southwest of the southern tip of Baja California. Maximum sustained winds are 45 knots (50 mph, 85 km/h), with stronger gusts. Minimum central pressure is 998 mbar (hPa; 29.47 InHg), and the system is moving west at 13 kt (15 mph, 24 km/h). Tropical storm force winds extend outward up to 60 miles (95 km) from the center of Emilia.