Former Tropical Storm Norbert regained tropical depression status south of Baja California on Tuesday afternoon. At 5:00 p.m. EDT on Tuesday the center of Tropical Depression Norbert was located at latitude 19.8°N and longitude 111.7°W which put it about 245 miles (390 km) south-southwest of the southern tip of Baja California. Norbert was moving toward the northwest at 13 m.p.h. (20 km/h). The maximum sustained wind speed was 35 m.p.h. (55 km/h) and there were wind gusts to 45 m.p.h. (75 km/h). The minimum surface pressure was 1007 mb.
After strong vertical wind shear weakened former Tropical Storm Norbert on Saturday, the lower levels of the circulation drifted slowly toward the northwest. The surface circulation around the former tropical storm moved into a region where the upper level winds were not as strong on Monday. More thunderstorms began to develop in bands revolving around around the center of the surface circulation. Additional thunderstorms formed near the center of the low on Tuesday afternoon and the National Hurricane Center designated the system as Tropical Depression Norbert.
Tropical Depression Norbert will move through a region somewhat favorable for intensification during the next 12 to 24 hours. Norbert will move over water where the Sea Surface Temperature is near 28°C during the next 12 hours. It will remain over water warmer than 26°C until Wednesday afternoon. After that time Norbert will start to move over even cooler water. An upper level low west of central Baja California will produce southerly winds which will blow toward the top of Tropical Depression Norbert. Those winds will produce vertical wind shear, but Norbert will remain east of the strongest shear for another 24 hours. When Norbert gets closer to the upper level low later on Wednesday, then the shear will increase and will cause it to weaken.
Tropical Depression Norbert will move between the upper level low west of Baja Californa and and upper level ridge over the southwestern U.S. and northern Mexico. Those two weather systems will steer Norbert toward the northwest during the next several days. On its anticipated track Tropical Depression Norbert is forecast to move parallel to the west coast of Baja California.
Tropical Storm Norbert developed southwest of Mexico on Tuesday morning. At 5: 00 a.m. EDT on Tuesday the center of Tropical Storm Norbert was located at latitude 13.7°N and longitude 106.2°W which put it about 385 miles (625 km) south-southwest of Manzanillo, Mexico. Norbert was moving toward the northwest at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 45 m.p.h. (75 km/h) and there were wind gusts to 60 m.p.h. (95 km/h). The minimum surface pressure was 1002 mb.
The wind speed increased around a low pressure system southwest of Mexico on Tuesday morning and the National Hurricane Center designated the system as Tropical Storm Norbert. More thunderstorms formed near the center of Norbert. Storms near the center of circulation started to generate upper level divergence which pumped mass away to the northeast of the tropical storm. Bands of showers and thunderstorms were developing outside the center of Norbert. The circulation around Tropical Storm Norbert was small. Winds to tropical storm force extended out 25 miles from the center of circulation.
Tropical Storm Norbert will be in an environment that is somewhat favorable for intensification. Norbert will move over water where the Sea Surface Temperature is near 29°C. A large upper level trough extends from northern Mexico over the Eastern North Pacific Ocean. The trough will produce southwesterly winds which will blow toward the top of Tropical Storm Norbert. Those winds will cause vertical wind shear and the shear will inhibit intensification. Tropical Storm Norbert could strengthen if the shear is not too strong.
Tropical Storm Norbert will be in a region where the steering currents are weak.. Norbert is not likely to move very much during the next several days. If Tropical Storm Norbert remains in the same location for more than a day, its winds will mix cooler water to the surface. That would limit the energy Norbert could extract from the ocean, and the tropical storm could weaken.
Elsewhere over the Eastern North Pacific, Tropical Storm Marie continued to churn west away from Baja California. At 5:00 a.m. EDT on Tuesday the center of Tropical Storm Marie was located at latitude 21.7°W and longitude 134.3°W which put it about 1560 miles (2510 km) west of the southern tip of Baja California. Marie was moving toward the west-northwest at 9 m.p.h. (15 km/h). The maximum sustained wind speed was 45 m.p.h. (75 km/h) and there were wind gusts to 60 m.p.h. (95 km/h). The minimum surface pressure was 1003 mb.