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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.

Tropical Storm Dora (04E) Near Baja California Before Dissipating

21.1N 111.5W

August 2nd, 2011 Category: Tropical Storms

Hurricane Dora (04E) - July 24th, 2011

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Hurricane Dora (04E) was the second Category 4 hurricane during the 2011 Pacific hurricane season. The fourth tropical depression, named storm, hurricane, and second major hurricane of the season, Dora developed a from a tropical wave on July 18. Quickly intensifying, the new tropical depression became a tropical storm just three hours after formation.

The storm began to explosively intensify on July 20, strengthening from a minimal hurricane to a category 4 in only 17 hours. Dora reached peak intensity in the morning hours of July 21. However, cooler waters and wind shear weakened the hurricane, and by the end of July 22, Dora had already weakened to a tropical storm and soon dissipated on July 24, after this image was acquired.

Dora (04E) at Time of Downgrading from Hurricane to Tropical Storm – August 2nd, 2011

21.7N 112.2W

August 2nd, 2011 Category: Image of the day, Tropical Storms

Hurricane Dora (04E) - July 22nd, 2011

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Hurricane Dora (04E) attained peak intensity later on July 21 with winds of 155 miles per hour (249 km/h) and a central minimum pressure of 942 millibars (942 hPa) while 445 miles (715 km) south-southeast of Cabo San Lucas, Mexico.

However, Dora began to traverse colder waters and encountered unfavorable wind shear. The eye abruptly dissipated and convection became much less organized. Within 12 hours, Dora already weakened into a category 3 hurricane.

On July 22, the day these images were acquired, the low-level circulation center became exposed as convection shifted to the southern semicircle. Dora continued to be sheared by strong northwesterly wind shear as it quickly weakened. Dora’s satellite signature deteriorated along with much of its convection. The hurricane was downgraded to a tropical storm late on July 22 as it moved into hostile atmospheric conditions and cooler water.

Hurricane Dora (04E) at Time of Strong Rip Currents and Rain by Southwest Mexico Coastline

18.2N 108W

August 1st, 2011 Category: Tropical Cyclones

Hurricane Dora (04E) - July 21st, 2011

On July 19, a tropical storm watch was issued for portions of the coast of Southwestern Mexico as Dora (04E) strengthened into a category one hurricane. The watch was continued until late on July 20, after Dora moved further away from the mainland.

Another watch was soon posted on July 21, the day this image was acquired, for the coasts of Baja California del Sur before it was upgraded into a warning the same day. The watch was discontinued two days after.

Dora caused strong rip currents and rain to Southwest Mexico’s coastline. In Acapulco, Mexico, police advised swimmers about the dangers of the strong waves. Dora’s storm surge toppled a lighthouse and swept about 60 thatch-roofed restaurants on the coast. In the Los Cabos Municipality, four elementary schools were converted into emergency shelters in preparation for any potential flooding. Boat tours and other tourism services in Los Cabos were suspended. As a remnant low, Dora enhanced a monsoon southerly flow into Arizona, producing showers across the state.