Category Archives: Eastern and Central Pacific

TCs between Mexico and Hawaii

Rick Rapidly Intensifies to a Hurricane South of Mexico

Former Tropical Storm Rick rapidly intensified to a hurricane south of Mexico early on Saturday. At 8:00 a.m. EDT on Saturday the center of Hurricane Rick was located at latitude 14.3°N and longitude 101.5°W which put it about 235 miles (380 km) south of Zihuatenajo, Mexico. Rick was moving toward the north-northwest at 6 m.p.h. (10 km/h). The maximum sustained wind speed was 75 m.p.h. (120 km/h) and there were wind gusts to 90 m.p.h. (145 km/h). The minimum surface pressure was 990 mb.

A Hurricane Watch was in effect for the portion of the coast from Tecpan De Galeana to Punta San Telmo, Mexico. Tropical Storm Watches were in effect for the portions of the coast from Punta San Telmo to Manzanillo and from Tecpan de Galeana to Acapulco, Mexico.

Former Tropical Storm Rick intensified rapidly during Friday night and it strengthened to a hurricane early on Saturday. A small eye formed at the center of Hurricane Rick. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Rick’s circulation. Storms near the core generated upper level divergence that pumped mass away from the hurricane. The removal of mass allowed the surface pressure to decrease quickly. The circulation around Hurricane Rick was small. Winds to hurricane force extended out 15 miles (25 km) from the center of Rick. Winds to tropical storm force extended out 60 miles (95 km) from the center of circulation.

Hurricane Rick will move through an environment very favorable for intensification during the next 24 hours. Rick will move over water where the Sea Surface Temperatures are near 30˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Hurricane Rick will likely continue to intensify rapidly during the next 24 hours. Rick could strengthen to a major hurricane on Sunday.

Hurricane Rick will move around the western part of a high pressure system over Mexico during the next 24 hours. A large upper level trough approaching the west coast of the U.S. will cause the high pressure system to weaken during the weekend. As the high pressure system weakens, the southern part of the upper level trough will steer Rick toward the north. On its anticipated track Hurricane Rick could approach the west coast of Mexico by later on Sunday. Rick could be a major hurricane when it approaches the coast of Mexico. The Hurricane and Tropical Storm Watches are likely to be changed to warnings later today. Hurricane Rick could bring strong winds and heavy rain to Guerrero and Michoacan on Sunday night and Monday.

TD 17E Strengthens to Tropical Storm Rick, Mexico Issues Watches

Former Tropical Depression Seventeen-E strengthened to Tropical Storm Rick on Friday afternoon and the government of Mexico issued a Hurricane Watch and Tropical Storm Watches for portions of the coast. At 5:00 p.m. EDT on Friday the center of Tropical Storm Rick was located at latitude 13.1°N and longitude 101.0°W which put it about 460 miles (745 km) south-southeast of Manzanillo, Mexico. Rick was moving toward the west-northwest at 7 m.p.h. (11 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 1005 mb.

A Hurricane Watch was issued for the portion of the coast from Zihuatenajo to Punta San Telmo, Mexico. Tropical Storm Watches were issued for the portions of the coast from Punta San Telmo to Manzanillo and from Zihuatenajo to Tecpan de Galeana, Mexico.

The circulation around former Tropical Depression Seventeen-E strengthened on Friday afternoon and the National Hurricane Center upgraded the system to Tropical Storm Rick. The inner end of a rainband wrapped around the western and southern sides of the center of Tropical Storm Rick. Other bands of showers and thunderstorms were revolving around the center of circulation. Storms near the center generated upped level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 45 miles (75 km) in the northern half of Tropical Storm Rick. The winds in the southern half of the circulation were blowing at less than tropical storm force.

Tropical Storm Rick will move through an environment favorable for intensification during the next 36 hours. Rick will move over water where the Sea Surface Temperatures are near 30˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Tropical Storm Rick will continue to intensify steadily during the next 36 hours. Rick could strengthen to a hurricane on Saturday.

Tropical Storm Rick will move around the southern part of a high pressure system over Mexico during the next few hours. A large upper level trough approaching the west coast of the U.S. will cause the high pressure system to weaken during the weekend. When the high pressure system weakens, the southern part of the upper level trough will turn Rick toward the north-northwest. On its anticipated track Tropical Storm Rick could approach the west coast of Mexico by later on Sunday. Rick could be a hurricane when it approaches the coast of Mexico. The Hurricane and Tropical Storm Watches are likely to be changed to warnings on Saturday.

Tropical Depression Seventeen-E Forms South of Mexico

Tropical Depression Seventeen-E formed south of Mexico on Friday morning. At 11:00 a.m. EDT on Friday the center of Tropical Depression Seventeen-E was located at latitude 12.7°N and longitude 100.5°W which put it about 505 miles (810 km) south-southeast of Manzanillo, Mexico. The depression was moving toward the west at 10 m.p.h. (16 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.

The circulation around a low pressure system over the Eastern North Pacific Ocean south of Mexico exhibited more organization on Friday morning and the National Hurricane Center designated the system as Tropical Depression Seventeen-E. The circulation around Tropical Depression Seventeen-E was still organizing. More thunderstorms developed near the center of the depression. More thunderstorms also formed in bands revolving around the center of circulation. Storms near the center began to generate upper level divergence that pumped mass away from the tropical depression.

Tropical Depression Seventeen-E will move through an environment favorable for intensification during the next 36 hours. The tropical depression will move over water where the Sea Surface Temperatures are near 30˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Tropical Depression Seventeen-E is likely to intensify steadily during the next 36 hours. The depression is likely to intensify to a tropical storm later today and it could strengthen to a hurricane on Saturday.

Tropical Depression Seventeen-E will move around the southern part of a high pressure system over Mexico during the next few hours. A large upper level trough approaching the west coast of the U.S. will cause the high pressure system to weaken during the weekend. When the high pressure system weakens, the southern part of the upper level trough will turn the tropical depression toward the north-northwest. On its anticipated track Tropical Depression Seventeen-E could approach the west coast of Mexico by later on Sunday. The tropical depression could be a hurricane when it approaches the coast of Mexico. Watches could be issued for a portion of the coast later on Friday or on Saturday morning.

Hurricane Pamela Makes Landfall on West Coast of Mexico

Hurricane Pamela made landfall on the west coast of Mexico northwest of Mazatlan near La Cruz on Wednesday morning. At 8:00 a.m. EDT on Wednesday the center of Hurricane Pamela was located at latitude 23.7°N and longitude 106.8°W which put it about 40 miles (65 km) northwest of Mazatlan, Mexico. Pamela was moving toward the northeast at 14 m.p.h. (22 km/h). The maximum sustained wind speed was 75 m.p.h. (120 km/h) and there were wind gusts to 90 m.p.h. (145 km/h). The minimum surface pressure was 987 mb.

A Hurricane Warning was in effect for the portion of the coast from Bahia Tempehuaya to Escuinapa, Mexico. The Hurricane Warning included Mazatlan. Tropical Storm Warnings were in effect for the portions of the coast from Altata to Bahia Tempehuaya, Mexico and from Escuinapa to Cabo Corrientes, Mexico.

Hurricane Pamela was being affected by moderate vertical wind shear as it approached the west coast of Mexico. A large upper level trough over the western U.S. was producing southwesterly winds that were blowing toward the top of Pamela’s circulation. Northerly winds in the lower levels of the western side of Hurricane Pamela pulled drier air into its circulation. The combination of moderate vertical wind shear and drier air caused an asymmetrical distribution of thunderstorms. The strongest thunderstorms and the strongest winds were occurring in bands in the northeastern part of Hurricane Pamela. Bands in other parts of the circulation consisted primarily of showers and lower clouds. Winds to hurricane force extended out 30 miles (50 km) in the northeastern quadrant of Pamela’s circulation. Winds to tropical storm force extended out 130 miles (210 km) on the eastern side of the circulation. Winds to tropical storm force extended out 80 miles (130 km) from the center of circulation.

The upper level trough over the western U.S. will steer Hurricane Pamela quickly toward the northeast during the next 24 hours. The circulation in the lower levels of Pamela will weaken quickly when it moves over the mountains in western Mexico. Pamela will drop locally heavy rain over parts of Sinaloa and Durango. Flash floods could occur in some locations. The remnants of of the middle and upper parts Pamela’s circulation could contribute to rainfall over Texas on Thursday.

Pamela Strengthens to a Hurricane Southwest of Mazatlan

Former Tropical Storm Pamela strengthened to a hurricane southwest of Mazatlan, Mexico on Tuesday morning. At 8:00 a.m. EDT on Tuesday the center of Hurricane Pamela was located at latitude 19.9°N and longitude 109.0°W which put it about 280 miles (455 km) southwest of Mazatlan, Mexico. Pamela was moving toward the north at 13 m.p.h. (20 km/h). The maximum sustained wind speed was 80 m.p.h. (130 km/h) and there were wind gusts to 95 m.p.h. (150 km/h). The minimum surface pressure was 985 mb.

A Hurricane Warning was in effect for the portion of the coast from Bahia Tempehuaya to Escuinapa, Mexico. The Hurricane Warning included Mazatlan. Tropical Storm Warnings were in effect for the portions of the coast from Altata to Bahia Tempehuaya, Mexico and from Escuinapa to Cabo Corrientes, Mexico. A Tropical Storm Watch was in effect for the portion of the coast of Baja California from Cabo San Lucas to Los Barilles.

Former Tropical Storm Pamela strengthened to a hurricane over the Eastern North Pacific Ocean southwest of Mazatlan on Tuesday morning. More thunderstorms developed near the center of Hurricane Pamela. Those thunderstorms generated more upper level divergence that pumped mass away from the hurricane. The removal of mass caused the surface pressure to decrease. Bands of showers and thunderstorms were revolving around the core of Hurricane Pamela. Winds to hurricane force extended out 25 miles (40 km) on the east side of Pamela. Winds to tropical storm force extended out 90 miles (145 km) from the center of circulation.

Hurricane Pamela will move through a region where the environment is somewhat favorable for intensification during the next 18 hours. Pamela will move over water where the Sea Surface Temperatures are near 30˚C. It will move under the the southern part of an upper level trough over the western U.S. The trough will produce southwesterly winds that will blow toward the top of Hurricane Pamela’s circulation. Those winds will cause some vertical wind shear. The wind shear will inhibit intensification, but the shear will not be strong enough to prevent Pamela from getting stronger.

Hurricane Pamela will move around the western part of a high pressure system over Mexico during the next few hours. The high pressure system will steer Pamela toward the north during that time period. The upper level trough over the western U.S. will turn Pamela toward the northeast in a few hours. On its anticipated track Hurricane Pamela will approach the west coast of Mexico early on Wednesday morning. Pamela will bring strong winds and locally heavy rain to the section of the coast near Mazatlan. Heavy rain could cause flash floods in parts of Sinaloa and Durango. The remnants of Pamela’s circulation could contribute to rainfall over Texas later this week,

Tropical Storm Pamela Intensifies, Hurricane Watch for Mexico

Tropical Storm Pamela intensified over the Eastern North Pacific Ocean on Monday morning and the government of Mexico issued a Hurricane Watch for a portion of the west coast. At 11:00 p.m. EDT on Monday the center of Tropical Storm Pamela was located at latitude 16.8°N and longitude 108.1°W which put it about 455 miles (735 km) south-southwest of Mazatlan, Mexico. Pamela was moving toward the northwest at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 65 m.p.h. (105 km/h) and there were wind gusts to 80 m.p.h. (130 km/h). The minimum surface pressure was 995 mb.

A Hurricane Watch was in effect for the portion of the coast from Bahia Tempehuaya to Escuinapa, Mexico. Tropical Storm Watches were in effect for the portions of the coast from Altata to Bahia Tempehuaya and from Escuinapa to San Blas. A Tropical Storm Watch was also in effect for the portion of the coast of Baja California from Los Barilles to Cabo San Lucas, Mexico.

Tropical Storm Pamela intensified more rapidly on Monday morning. The inner end of a rainband wrapped tightly around the southern and eastern sides of the center of Pamela. Storms near the center of circulation generated strong upper level divergence that pumped mass away from the tropical storm. The removal of mass allowed the surface pressure to decrease more quickly. Bands of showers and thunderstorms were revolving around the core of Tropical Storm Pamela. The circulation around Pamela was relatively small. Winds to tropical storm force extended out 70 miles (110 km) from the center of circulation.

Tropical Storm Pamela will move through a region where the environment is favorable for intensification during the next 36 hours. Pamela will move over water where the Sea Surface Temperatures are near 30˚C. It will move under the axis of an upper level ridge over the Eastern North Pacific Ocean. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. Tropical Storm Pamela could strengthen to a hurricane during the next 12 hours. Pamela could intensify rapidly once an inner core with an eye and eyewall forms. Pamela could rapidly intensify to a major hurricane by Tuesday night.

Tropical Storm Pamela will move around the southwestern part of a high pressure system over Mexico during the next 24 hours. The high pressure system will steer Pamela toward the north-northwest during that time period. An upper level trough over the western U.S. will turn Pamela toward the northeast on Tuesday. On its anticipated track Pamela could be south of Baja California on Tuesday evening. Pamela could be a major hurricane when it approaches the west coast of Mexico on Wednesday morning.

Tropical Storm Pamela Forms South of Mexico

Tropical Storm Pamela formed south of Mexico on Sunday afternoon. At 5:00 p.m. EDT on Sunday the center of Tropical Storm Pamela was located at latitude 15.5°N and longitude 105.9°W which put it about 265 miles (425 km) south-southwest of Manzanillo, Mexico. Pamela was moving toward the west-northwest at 15 m.p.h. (24 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 1005 mb.

A low pressure system south of Mexico strengthened on Sunday afternoon and the National Hurricane Center designated the system as Tropical Storm Pamela. The circulation around Tropical Storm Pamela was gradually becoming more organized. A band of showers and thunderstorms was wrapping around the western and southern sides of the center of Pamela. Storms near the center of circulation generated upper level divergence that pumped mass away to the west of the tropical storm. Other bands of showers and thunderstorms were revolving around the center of Tropical Storm Pamela. Winds to tropical storm force extended out 60 miles (95 km) in the northeastern quadrant of Pamela’s circulation. The winds in the other parts of the circulation were blowing at less than tropical storm force.

Tropical Storm Pamela will move through a region where the environment is favorable for intensification during the next 36 hours. Pamela will move over water where the Sea Surface Temperatures are near 30˚C. It will move under the axis of an upper level ridge over the Eastern North Pacific Ocean. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. Tropical Storm Pamela will intensify during the next 36 hours. It could strengthen to a hurricane by Monday night.

Tropical Storm Pamela will move around the southwestern part of a high pressure system over Mexico during the next 36 hours. The high pressure system will steer Pamela toward the northwest during that time period. An upper level trough over the western U.S. will turn Pamela toward the northeast later on Tuesday. On its anticipated track Pamela could be south of Baja California on Tuesday night. Pamela is likely to be a hurricane when it approaches the west coast of Mexico on Wednesday afternoon.

Olaf Weakens to Tropical Storm over Southern Baja California

Former Hurricane Olaf weakened to a tropical storm when it passed over southern Baja California on Friday. At 2:00 p.m. EDT on Friday the center of Tropical Storm Olaf was located at latitude 24.5°N and longitude 112.2°W which put it about 20 miles (30 km) south-southeast of Cabo San Lazaro, Mexico. Olaf was moving toward the northwest at 12 m.p.h. (19 km/h). The maximum sustained wind speed was 50 m.p.h. (80 km/h) and there were wind gusts to 80 m.p.h. (130 km/h). The minimum surface pressure was 997 mb.

A Tropical Storm Warning was in effect for the portion of the coast from Puerto San Andresito to Loreto. The Tropical Storm Warning included Cabo San Lucas and La Paz.

Former Hurricane Olaf weakened on Friday when the circulation passed over mountains in the southern part of Baja California. The low level center of circulation of Tropical Storm Olaf was visible on satellite images. The low level center was back over the Eastern North Pacific Ocean near Cabo San Lazaro. There were mainly showers and lower clouds near the low level center. Most of the thunderstorms were occurring in bands on the eastern side of Olaf that were over Baja California and the Gulf of California. Winds to tropical storm force extended out 70 miles (110 km) from the center of circulation. A weather station in Puerto Cortes, Mexico recently reported a sustained wind speed of 44 m.p.h. (70 km/h) and a wind gust of 53 m.p.h. (85 km/h).

Tropical Storm Olaf will move through an environment unfavorable for intensification during the next several days. Olaf will move over water where the Sea Surface Temperature is near 25˚C. The air over the cooler water is drier and more stable. Drier, more stable air will inhibit the develop of thunderstorms. If new thunderstorms do not form near the center of Tropical Storm Olaf during the next 12 hours, it will gradually weaken. Olaf is forecast to weaken to a tropical depression on Saturday.

The future track of Tropical Storm Olaf will depend on how fast Olaf weakens. If no new thunderstorms develop near the center of Olaf, then the tropical storm will be steered by the winds in the lower levels of the atmosphere. A surface high pressure system over the Eastern North Pacific Ocean is forecast to steer Tropical Storm Olaf toward the west-southwest during the weekend. On its anticipated track Tropical Storm Olaf will gradually move away from Baja California.

Hurricane Olaf Makes Landfall on Southern Tip of Baja California

Hurricane Olaf made landfall on southern tip of Baja California on Thursday night. At 11:00 p.m. EDT on Thursday the center of Hurricane Olaf was located at latitude 23.0°N and longitude 109.6°W which put it about 20 miles (30 km) east-northeast of Cabo San Lucas, Mexico. Olaf was moving toward the northwest at 12 m.p.h. (19 km/h). The maximum sustained wind speed was 100 m.p.h. (160 km/h) and there were wind gusts to 120 m.p.h. (195 km/h). The minimum surface pressure was 974 mb.

A Hurricane Warning Was in effect for the portion of the coast from Los Barriles to Cabo San Lazaro, Mexico. The Hurricane Warning included Cabo San Lucas. Tropical Storm Warnings were in effect for the portions of the coast from Cabo San Lazaro to Puerto San Andresito, Mexico and from Los Barriles to Loreto, Mexico.

The eye of Hurricane Olaf made landfall on the southern tip of Baja California near San Jose del Cabo on Thursday night. Olaf continued to intensify right up until the center moved ashore. Hurricane Olaf strengthened to Category 2 on the Saffir-Simpson Scale prior to landfall. Winds to hurricane force extended out 35 miles (55 km) from the center of Olaf. Winds to tropical storm force extended out 105 miles (165 km) from the center of circulation. The Hurricane Intensity Index (HII) for Hurricane Olaf was 16.5. The Hurricane Size Index (HSI) was 10.5 and the Hurricane Wind Intensity Size Index (HWISI) was 27.0

Hurricane Olaf was capable of causing regional serious damage. Olaf will produce strong winds over the southern part of Baja California. Wind damage could cause widespread power outages. Hurricane Olaf will also drop heavy rain over the region and flash floods are likely to occur. Hurricane Olaf will move northwest over Baja California during the next 24 hours. Mountains will begin to disrupt the circulation and Olaf will weaken. The area of heavy rain will move northward, as will the risk for flash floods.

Olaf Strengthens to a Hurricane Southeast of Baja California

Former Tropical Storm Olaf strengthened to a hurricane southeast of Baja California on Thursday morning. At 11:00 a.m. EDT on Thursday the center of Hurricane Olaf was located at latitude 21.2°N and longitude 108.3°W which put it about 155 miles (250 km) southeast of Cabo San Lucas, Mexico. Olaf was moving toward the north-northwest at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 75 m.p.h. (120 km/h) and there were wind gusts to 90 m.p.h. (145 km/h). The minimum surface pressure was 987 mb.

A Hurricane Warning Was in effect for the portion of the coast from Los Barriles to Sante Fe, Mexico. The Hurricane Warning included Cabo San Lucas. Tropical Storm Warnings were in effect for the portions of the coast from Santa Fe to Cabo San Lazaro, Mexico and from Los Barriles to San Evaristo, Mexico.

Former Tropical Storm Olaf intensified quickly to a hurricane during the past 24 hours. A circular eye formed at the center of Hurricane Olaf. The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Hurricane Olaf. Storms near the core generated upper level divergence that pumped mass away from the hurricane. Winds to hurricane force extended out 35 miles (55 km) on the eastern side of Olaf. Winds to tropical storm force extended out 115 miles (185 km) from the center of circulation.

Hurricane Olaf will move through an environment favorable for intensification during the next 12 hours. Olaf will move over water where the Sea Surface Temperature is near 29˚C. It will move south of an upper level ridge over the southwestern U.S. The ridge will produce northeasterly winds that will blow toward the top of Olaf’s circulation. Those winds will cause some vertical wind shear, but the shear will not be strong enough to prevent intensification of Hurricane Olaf. Olaf will strengthen during the next 12 hours and there is a chance it could intensify to Category 2 on the Saffir-Simpson Scale.

Hurricane Olaf will move around the western side of a high pressure system over Mexico. The high will steer Olaf toward the northwest during the next 24 hours. On its anticipated track Tropical Storm Olaf will approach the southern end of Baja California on Thursday night. Olaf will bring strong winds and locally heavy rain to southern Baja California. Heavy rain is likely to cause flash floods in some locations. Hurricane Olaf will also cause a storm surge along the southern end of Baja California.