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Tropical Storm Bonnie Hits Nicaragua and Costa Rica

Tropical Storm Bonnie hit southern Nicaragua and northern Costa Rica on Friday night. At 11:00 p.m. EDT on Friday the center of Tropical Storm Bonnie was located at latitude 10.9°N and longitude 83.8°W which put it about 75 miles (120 km) south of Bluefields, Nicaragua. Bonnie was moving toward the west at 16 m.p.h. (26 km/h). The maximum sustained wind speed was 50 m.p.h. (80 km/h) and and there were wind gusts to 65 m.p.h. (105 km/h). The minimum surface pressure was 995 mb.

A Tropical Storm Warning was in effect for the portion of the Caribbean coast from Limon, Costa Rica to Sandy Bay Sirpi, Nicaragua. A Tropical Storm Warning was also in effect for the portion of the Pacific coast from Cabo Blanco, Costa Rica to the border between Nicaragua and Honduras.

The center of Tropical Storm Bonnie made landfall on the Caribbean coast near the border between Nicaragua and Costa Rica on Friday night. Bonnie was beginning to strengthen rapidly just prior to landfall. A reconnaissance plane reported an eye with a diameter of 12 miles (19 km) had developed at the center of Tropical Storm Bonnie. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Winds to tropical storm force extended out 115 miles (185 km) on the northern side of Bonnie’s circulation. Winds to tropical storm force extended out 20 miles (30 km) on the southern side of Tropical Storm Bonnie.

Tropical Storm Bonnie will move south of the western part of a high pressure system over the western Atlantic Ocean and the Caribbean Sea. The high pressure system will steer Bonnie toward the west during the next 24 hours. On its anticipated track Tropical Storm Bonnie will move along the border between Nicaragua and Costa Rica. Bonnie will bring gusty winds and locally heavy rain to southern Nicaragua and northern Costa Rica. Heavy rain could cause flash floods and mudslides in some locations. Bonnie will move over the Eastern North Pacific Ocean on Saturday.

Tropical Storm Bonnie will weaken while it moves over land. Mountains are likely to disrupt the low level circulation and to cause the developing eye and eyewall to dissipate. Bonnie will move over water where the Sea Surface Temperatures are near 28˚C when it moves over the Eastern North Pacific Ocean. Bonnie is forecast to strengthen back to a tropical storm when it moves over the Eastern North Pacific Ocean and it could intensify to a hurricane in a couple of days.

Tropical Storm Bonnie Forms over Southwest Caribbean Sea

Tropical Storm Bonnie formed over the Southwestern Caribbean Sea on Friday morning. At 11:00 a.m. EDT on Friday the center of Tropical Storm Bonnie was located at latitude 11.2°N and longitude 81.9°W which put it about 195 miles (315 km) east-southeast of Bluefields, Nicaragua. Bonnie was moving toward the west at 20 m.p.h. (32 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1005 mb.

A Tropical Storm Warning was in effect for San Andres Island, Colombia. A Tropical Storm Warning was in effect for the portion of the Caribbean coast from Limon, Costa Rica to Sandy Bay Sirpi, Nicaragua. A Tropical Storm Warning was also in effect for the portion of the Pacific coast from Cabo Blanco, Costa Rica to the border between Nicaragua and Honduras.

A U.S. Air Force Reserve Hurricane Hunter reconnaissance aircraft found westerly winds in the southwestern part of former Potential Tropical Cyclone Two on Friday morning. Based on data from the reconnaissance plane, the National Hurricane Center designated the system as Tropical Storm Bonnie. More thunderstorms formed in bands revolving around the center of Tropical Storm Bonnie. Storms near the center of Bonnie generated upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 100 miles (160 km) in the northern side of Bonnie’s circulation. Winds in the southern side of Tropical Storm Bonnie were blowing at less than tropical storm force.

Tropical Storm Bonnie will move through an environment favorable for intensification during the next 12 hours. Bonnie will move over water where the Sea Surface Temperatures are near 28˚C. It will be under an upper level ridge over the Southwestern Caribbean Sea. The upper level winds are weak in the ridge and there will be little vertical wind shear. Tropical Storm Bonnie will strengthen during the next 12 hours. Bonnie will weaken when it moves over Nicaragua and Costa Rica, but it could strengthen again over the Eastern North Pacific Ocean on Saturday.

Tropical Storm Bonnie will move south of the western part of a high pressure system over the western Atlantic Ocean and the Caribbean Sea. The high pressure system will steer Bonnie toward the west during the next 24 hours. On its anticipated track Tropical Storm Bonnie will hit southern Nicaragua and northern Costa Rica on Friday night. Bonnie will bring gusty winds and locally heavy rain to southern Nicaragua and northern Costa Rica. Heavy rain could cause flash floods and mudslides in some locations.

Potential Tropical Cyclone Two Moves Toward Nicaragua

Potential Tropical Cyclone Two moved over the Southwestern Caribbean Sea toward Nicaragua on Thursday night. At 11:00 p.m. EDT on Thursday the center of Potential Tropical Cyclone Two was located at latitude 11.8°N and longitude 77.7°W which put it about 410 miles (665 km) east of Bluefields, Nicaragua. Potential Tropical Cyclone Two was moving toward the west at 21 m.p.h. (33 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1005 mb.

A Hurricane Watch was in effect for the portion of the coast from Laguna de Perlas, Nicaragua to the border with Costa Rica. A Tropical Storm Warning was in effect for San Andres Island, Colombia. A Tropical Storm Warning was also in effect for the portion of the coast from Limon, Costa Rica to Sandy Bay Sirpi, Nicaragua. A Tropical Storm Watch was in effect for the Pacific Coast from Cabo Blanco, Costa Rica to Puerto Sandino, Nicaragua.

Potential Tropical Cyclone Two exhibited more organization on Thursday night. More thunderstorms developed near the center of circulation. A reconnaissance aircraft found that the surface pressure had decreased slightly. However, there were still parts of the circulation that consisted primarily of showers and lower clouds. The strongest winds were occurring in the northern half of the circulation. Winds to tropical storm force extended out 80 miles (130 km) on the northern side of Potential Tropical Cyclone Two. The winds in the southern half of the circulation were blowing at less than tropical storm force.

Potential Tropical Cyclone Two will move through an environment favorable for the development of a tropical cyclone during the next 24 hours. It will move over water where the Sea Surface Temperatures are near 28˚C. Potential Tropical Cyclone Two will move under an upper level ridge over the Southwestern Caribbean Sea. The upper level winds are weak in the ridge and there will be little vertical wind shear. Potential Tropical Cyclone Two could develop into a tropical storm on Friday.

Potential Tropical Cyclone Two will move south of the western part of a high pressure system over the western Atlantic Ocean and the Caribbean Sea. The high pressure system will steer Potential Tropical Cyclone Two toward the west during the next 24 hours. On its anticipated track Potential Tropical Cyclone Two will begin to affect southern Nicaragua and northern Costa Rica on Friday evening. It could be a tropical storm when it approaches the coast. It will bring gusty winds and locally heavy rain to southern Nicaragua and northern Costa Rica. Heavy rain could cause flash floods in some locations.

Possible Development over Southwest Caribbean Sea

A tropical depression or tropical storm could develop over the Southwestern Caribbean Sea east of Nicaragua during the next few days. An area of low pressure at the surface, currently designated as Invest 93L, is over that area. At 2:00 p.m. EDT on Tuesday the center of Invest 93L was located at latitude 11.8°N and longitude 82.2°W which put it about 110 miles (175 km) east of Bluefields, Nicaragua. Invest 93L was moving toward the west-northwest at 6 m.p.h. (10 km/h). The maximum sustained wind speed was 25 m.p.h. (40 km/h) and and there were wind gusts to 35 m.p.h. (55 km/h). The minimum surface pressure was 1009 mb.

Invest 93L was located on the eastern side of a larger area of low pressure that extends from the Southwestern Caribbean Sea across Central America to the Eastern North Pacific Ocean. A second, small low pressure system, currently designated as Invest 93E, was located over the Eastern North Pacific Ocean south of El Salvador. Visible satellite images appeared to show some counterclockwise rotation of lower clouds over the Southwestern Caribbean Sea east of Nicaragua. A few thunderstorms formed near the apparent center of circulation, but the system did not possess enough organization to be classified as a tropical depression.

Invest 93L will be in an environment that is somewhat favorable for the formation of a tropical cyclone during the next few days. Invest 93L will move over water where the Sea Surface Temperatures are near 29˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. If Invest 93L remains over the Southwest Caribbean Sea, it could develop into a tropical depression during the next 48 hours. However, if the center of Invest 93L moves inland over Nicaragua, then it will not develop. The National Hurricane Center is indicating there is a probability of 40% that Invest 93L develops into a tropical cyclone. A reconnaissance plane has been tentatively tasked to investigate Invest 93L on Wednesday afternoon, if necessary.

Invest 93L will move near the southwestern part of a high pressure system that extends from the Western Atlantic Ocean over the Caribbean Sea and the Gulf of Mexico. The steering winds are weak near the southwestern part of the high pressure system, but those winds could steer Invest 93L slowly toward the northwest during the next few days. On its anticipated track, Invest 93L will move close to the coast of Nicaragua. Invest 93L could drop heavy rain over parts of Nicaragua, Honduras, Costa Rica and El Salvador. Locally heavy rain could cause flash floods in some places.