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Blanca (03E) Weakens to Tropical Storm

19.9N 115.3W

July 8th, 2009 Category: Tropical Storms

Tropical Depression 03E (Blanca) - July 8th, 2009 © Univ. of Wisconsin

Tropical Depression 03E (Blanca) - July 8th, 2009

Blanca has weakened from a tropical storm to a tropical depression. At 2:00 AM PDT (0900 UTC) the center of the system was located about 600 miles (970 km) west-southwest of the southern tip of Baja California.

The depression is moving toward the west-northwest near 14 mph (22 km/hr) and this general motion is expected to continue for the next day or two with some decrease in forward speed.

Maximum sustained winds have decreased to near 35 mph (55 km/hr) with higher gusts. Estimated minimum central pressure is 1004 mb (29.65 inches). Additional weakening is forecast during the next 24 to 48 hours, and Blanca could weaken to a remnant low later today or Thursday.

Tropical Storm 03E (Blanca) Strengthens Slightly

19.9N 114.6W

July 7th, 2009 Category: Tropical Storms

Tropical Storm 03E (Blanca) organizes - July 5th, 2009

Tropical Storm 03E (Blanca) organizes - July 5th, 2009

Track of TS03E - July 7th, 2009 © Univ. of Wisconsin

Track of TS03E - July 7th, 2009

Tropical Storm Blanca formed Monday off western Mexico as the second named storm of the Pacific season, but forecasters have predicted it will follow a course far away from land.

At 8:00 PM PDT (0300 UTC) the center of Tropical Storm Blanca was located about 410 miles (660 km) southwest of the southern tip of Baja California, Mexico, and had strengthened slightly.

The main image shows the area of convection organizing before it became a tropical storm, while the animated image shows the more recent track of the system.

Blanca is moving toward the west-northwest near 10 mph (17 km/hr), and this general motion is expected to continue with some decrease in forward speed during the next 48 hours.

Maximum sustained winds are near 50 mph (85 km/hr) with higher gusts. Some additional strengthening is possible within the next 12 hours or so. Thereafter, Blanca is expected to weaken.

Tropical storm force winds extend outward up to 70 miles (110 km) from the center. Estimated minimum central pressure is 998 mb (29.47 inches).

Blanca Dissipates, New System Forms

14.6N 110.3W

July 10th, 2009 Category: Tropical Storms

Tropical Cyclone Formation - July 9th, 2009

Tropical Cyclone Formation - July 9th, 2009

enhanced image

enhanced image

Track of TC formation - July 10th, 2009 © Univ. of Wisconsin

Track of TC formation

As Tropical Storm Blanca (03E) dissipates off the western coast of Mexico, a new contestant has already begun preparing to come into play: an area of low pressure located about 900 miles south of the southern tip of Baja California continues to show signs of organization.

Conditions appear to be favorable for this system to become a tropical depression on Friday as it moves west-northwestward near 10 mph. There is a high chance, greater than 50 percent, of this system becoming a tropical cyclone during the next 48 hours.

Winds in the area are estimated to be 20 to 25 knots, and the system is moving west-northwestward at 6 knots. Recent NHC pressure estimates show a decrease in sea level pressure of over 2 mb in the past 24 hours. It is now estimated to be near 1007 mb.

Recent animated multispectral imagery indicates that the low level circulation center (LLCC) has begun to organize with convective banding wrapping into it from all quadrants.

Upper level analysis reveals that the system is in a region of moderate vertical wind shear, but the system has good equatorward outflow and improving poleward outflow due to interaction with an upper level low located north of the system.

The remnants of Blanca, on the other hand, located about 950 miles west of the southern tip of Baja California, are producing a few showers while moving northwestward at 5 to 10 mph.

Blanca Slowing, Expected to Dissipate

23.2N 118.8W

July 9th, 2009 Category: Tropical Storms

Remnant Low of Blanca (03E) - July 9th, 2009 © Univ. of Wisconsin

Remnant Low of Blanca (03E) - July 9th, 2009

Blanca (03E) has weakened from a tropical depression to a remnant low.  At 8:00 PM PDT (0300 UTC) the center of the system was located about 775 miles (1245 km) west of the southern tip of Baja California.

The low is moving toward the west-northwest near 10 mph and this general motion with a gradual decrease in forward speed is expected until dissipation.

Maximum sustained winds are near 30 mph (45 km/hr) with higher gusts.  Estimated minimum central pressure is 1006 mb (29.71 inches). The low is forecast to slowly weaken over the next couple of days.

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