Bonnie Weakens to a Tropical Storm

Former Hurricane Bonnie weakened to a tropical storm as it moved over the Eastern North Pacific Ocean southwest of Baja California on Friday. At 5:00 p.m. EDT on Friday the center of Tropical Storm Bonnie was located at latitude 18.6°N and longitude 121.8°W which put it about 825 miles (1325 km) west-southwest of the southern tip of Baja California. Bonnie was moving toward the west at 18 m.p.h. (30 km/h). The maximum sustained wind speed was 65 m.p.h. (105 km/h) and and there were wind gusts to 80 m.p.h. (1305 km/h). The minimum surface pressure was 998 mb.

The circulation around former Hurricane Bonnie spun down gradually as it moved over cooler water in the Eastern North Pacific southwest of Baja California. The low level circulation around Tropical Storm Bonnie was still well organized. However, thunderstorms in bands revolving around the center of Bonnie weakened. Many of the bands consisted primarily of showers and lower clouds. The remaining thunderstorms did not extend as high into the atmosphere and they did not generate much upper level divergence. The inflow of mass at the lower levels caused the surface pressure to increase, because there was not enough upper level divergence to remove the incoming mass. Winds to tropical storm force extended out 60 miles (95 km) from the center of Bonnie.

Tropical Storm Bonnie will move south of a high pressure system over the Eastern North Pacific Ocean. The high pressure system will steer Bonnie toward the west-northwest during the next 36 hours. On its anticipated track Tropical Storm Bonnie will move farther away from Baja California during the next several days.

Tropical Storm Bonnie will continue to weaken gradually during the next few days. Bonnie will move over water where the Sea Surface Temperatures are near 24˚C. Tropical Storm Bonnie will not be able to extract enough energy from the upper ocean to maintain its circulation. So, the circulation will continue to spin down gradually during the next few days.