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Guillermo Weakens from Hurricane to Tropical Storm

25.1N 150.4W

August 18th, 2009 Category: Tropical Storms

Formation of Tropical Storm Vamco - August 16th, 2009

Formation of Tropical Storm Vamco - August 16th, 2009

As of 5 p.m. HST August 17 (0300 UTC August 18), the center of Tropical Storm Guillermo (10E) was estimated to be located about 525 mi (845 km) east-northeast of Hilo, Hawaii and about 660 mi (1060 km) east-northeast of Honolulu, Hawaii.

Tropical Storm Guillermo has maximum sustained winds of 40 kt (45 mph, 75 km/h), with higher gusts. The system has a minimum central pressure of 1004 mbar (29.65 inches), and is moving west-northwest at 17 kt (20 mph, 31 km/h). Tropical storm force winds extend outward up to 70 miles (115 km) from the center of Guillermo.

Tropical Storm Guillermo Forms West-Southwest of Baja California

17.3N 118.1W

August 13th, 2009 Category: Tropical Storms

Formation of TS Guillermo - August 11th, 2009

Formation of TS Guillermo - August 11th, 2009

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Track of Guillermo - August 13th, 2009 © Univ. of Wisconsin

Track of Guillermo

Tropical Storm Guillermo formed on August 12 from a broad area of low pressure nearly 700 miles southwest of Baja California.

The system developed a good series of banding features and convection, and as a result, in the early afternoon later that day, it strengthened into a tropical storm. The main image shows the system as it was developing, while the animated imagery depicts the movement of the full-fledged tropical storm.

As of 2:00 AM PDT (0900 UTC), the center of the system was located about 805 miles (1295 km) west-southwest of the southern tip of Baja California. Guillermo is moving toward the west-northwest near 16 mph (26 km/hr), and this general motion is expected to continue during the next day or two.

Maximum sustained winds have increased to near 50 mph (85 km/hr) with higher gusts. Some additional strengthening is forecast during the next day or two. Tropical storm force winds extend outward up to 85 miles (140 km) from the center. Estimated minimum central pressure is 999 mb (29.50 inches).

Hurricane Guillermo Moving West-Northwest

20.6N 144.1W

August 17th, 2009 Category: Tropical Storms

Hurricane Guillermo - August 15th, 2009

Hurricane Guillermo - August 15th, 2009

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Track of Guillermo - August 17th, 2009 © Univ. of Wisconsin

Track of Guillermo

Guillermo (10E)  strengthened to become the fourth hurricane of the season on August 14th, concurrent to the development of a good, banding type eye. That afternoon, the system strengthened to a Category 2 hurricane with maximum winds increasing to 100 mph (155 km/h).

Early on August 15, Guillermo intensified to become the second major hurricane of the season, as it was upgraded by the NHC to a Category 3 hurricane, with maximum winds increasing to 115 mph (185km/h).

As of 5 p.m. HST August 16 (0300 UTC August 17), the center of Hurricane Guillermo is estimated to be located about 890 mi (1430 km) east of Hilo, Hawaii. Hurricane Guillermo has maximum sustained winds of 65 kt (75 mph, 120 km/h), with higher gusts.

The system has a minimum central pressure of 985 mbar (29.09 inches), and is moving west-northwest at 13 kt (15 mph, 24 km/h). Hurricane force winds extend up to 35 miles (55 km) from the center of Guillermo, and tropical storm force winds up to 105 miles (170 km) from the center.

Hurricane Guillermo (10E)

15.9N 120.9W

August 14th, 2009 Category: Tropical Storms

Formation of TS Guillermo - August 14th, 2009

Formation of TS Guillermo - August 14th, 2009

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Enhanced image

Track of Guillermo - August 14th, 2009 © Univ. of Wisconsin

Track of Guillermo

The center of Hurricane Guillermo was located near latitude 17.6 north, longitude 125.9 west or about 1100 miles (1770 km) west-southwest of the southern tip of Baja California.

Guillermo is moving toward the west near 15 mph (24 km/h) and this motion is expected to continue with a gradual turn toward the west-northwest over the next couple of days.

Maximum sustained winds are near 75mph (120km/h) with higher gusts. Some additional strengthening is possible today, but Guillermo is expected to weaken on Saturday as it moves over cooler waters.

Hurricane force winds extend outward up to 15 miles (30 km) from the center, and tropical storm force winds extend outward up to 105 miles (165 km).

Estimated minimum central pressure is 987 mb (29.15 inches).

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