Tropical Storm Julia developed over the Caribbean Sea just north of Colombia on Friday morning. At 11:00 a.m. EDT on Friday the center of Tropical Storm Julia was located at latitude 12.7°N and longitude 73.1°W which put it about 110 miles (175 km) west of the northern tip of the Guajira Peninsula, Colombia. Julia was moving toward the west at 18 m.p.h. (30 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1002 mb.

A Hurricane Warning was in effect for San Andres, Providencia, and Santa Catalina Islands. A Hurricane Watch was in effect for the portion of the coast from Bluefields, Nicaragua to the border with Honduras. A Tropical Storm Warning for the portion of the coast from Riohacha, Colombia eastward to the border with Venezuela. A Tropical Storm Watch was in effect for the portion of the coast from Punta Patuca, Honduras to the border with Nicaragua.

Former Tropical Depression Thirteen strengthened on Friday morning after the center of circulation moved over the Caribbean Sea north of Colombia and the National Hurricane Center upgraded the weather system to Tropical Storm Julia. Almost half of the circulation of Tropical Storm Julia was still over northern Colombia. More thunderstorms formed in the northern side of Julia which was over the Caribbean Sea. The inner end of a rainband wrapped around the northern and western sides of the center of Tropical Storm Julia. Storms near the center of Julia generated upper level divergence that pumped mass away to the west of the Tropical Storm. Winds to tropical storm force extended out 80 miles in the northern side of Julia’s circulation. The winds in the southern half of Julia were blowing at less than tropical storm force.

Tropical Storm Julia will move into an environment favorable for intensification during the next 36 hours. Julia will move over water where the Sea Surface Temperatures are near 29˚C. It will move under the axis of an upper level ridge over the Caribbean Sea. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. Tropical Storm Julia will intensify during the next 36 hours. Julia is likely to strengthen to a hurricane during the weekend. Tropical Storm Julia could intensify rapidly after an inner core with an eye and an eyewall form.

Tropical Storm Julia will move south of a high pressure system over the Caribbean Sea. The high pressure system will steer Julia toward the west during the next 48 hours. On its anticipated track Tropical Storm Julia will move over the southwestern Caribbean Sea on Friday. Julia could reach San Andres, Providencia and the Santa Catalina Islands by Saturday evening. It could be a hurricane by that time. Julia could reach the coast of Nicaragua on Sunday morning. Julia will bring strong gusty winds and locally heavy rain. Heavy rain will cause flash floods in some locations.