Tropical Depression Forms Southwest of the Azores

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A tropical depression formed over the North Atlantic Ocean southwest of the Azores on Saturday morning.  At 11:00 a.m. EDT on Saturday the center of Tropical Depression Six was located at latitude 32.6°N and longitude 33.6°W which put the center about 525 miles (845 km) southwest of the Azores.  The tropical depression was moving toward the north at 2 m.p.h. (3 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 1009 mb.

A low pressure system over the North Atlantic Ocean southwest of the Azores strengthened on Saturday morning and the U.S. National Hurricane Center designated the system as Tropical Depression Six.

The distribution of thunderstorms in Tropical Depression Six was asymmetrical.  Thunderstorms were occurring in bands in the northern side of the tropical depression.  Bands in the southern side of the circulation consisted primarily of showers and lower clouds.

Tropical Depression Six will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  The tropical depression will move over water where the Sea Surface Temperatures are near 26°C.  It will move north of a subtropical jet stream.  The tropical depression will stay south of the polar front jet stream.  The upper level winds are weaker between the two jet streams.  There will be some vertical wind shear, but the wind shear may not be enough to prevent intensification.  Tropical Depression Six could intensify to a tropical storm during the next 24 hours.

The steering currents are weak between the subtropical jet stream and the polar front jet stream.  Tropical Depression Six is likely to meander during the next 24 hours.  On its anticipated track, Tropical Depression Six will remain far to the southwest of the Azores.

Dujuan Strengthens to a Typhoon

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Former Tropical Storm Dujuan strengthened to a typhoon on Friday as it moved over the Western North Pacific Ocean northwest of Iwo To.  At 11:00 p.m. EDT on Friday the center of Typhoon Dujuan was located at latitude 26.5°N and longitude 139.4°E which put the center about 140 miles (225 km) northwest of Iwo To.  Dujuan was moving toward the west-northwest at 9 m.p.h. (15 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 978 mb.

Former Tropical Storm Dujuan strengthened to a typhoon on Friday.  The inner end of a rainband wrapped around the southern and eastern side of the center of Typhoon Dujuan.  Thunderstorms were occurring in bands in the northern side of Dujuan’s circulation.  Bands in the southern side of Typhoon Dujuan consisted primarily of showers and lower clouds.  Storms near the center of Dujuan generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The strongest winds were occurring close to the center of Typhoon Dujuan.  Winds to typhoon force extended out 20 miles (30 km) from the center of Dujuan’s circulation.  Winds to tropical storm force extended out 250 miles (400 km) in the northern side of Typhoon Dujuan.  Winds to tropical storm force extended out 140 miles (225 km) in the southern half of Dujuan’s circulation.

Typhoon Dujuan will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  Dujuan will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the western part of an upper level ridge that is southeast of Japan.  The upper level ridge will produce southerly winds that will blow toward the top of Dujuan’s circulation.  Those winds will cause moderate vertical wind shear.  The moderate vertical wind shear will inhibit intensification, but the wind shear may not be enough to prevent intensification.  Typhoon Dujuan could intensify a little more during the next 24 hours.

Typhoon Dujuan will move around the western part of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Dujuan toward the northwest during the next 24 hours.  On its anticipated track, Typhoon Dujuan will move closer to Honshu during the weekend.

Tropical Storm Dujuan Moves East of Iwo To

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Tropical Storm Dujuan moved east of Iwo To on Thursday.  At 11:00 p.m. EDT on Thursday the center of Tropical Storm Dujuan was located at latitude 25.3°N and longitude 143.8°E which put the center about 200 miles (325 km) east of Iwo To.  Dujuan was moving toward the west at 17 m.p.h. (28 km/h).  The maximum sustained wind speed was 70 m.p.h. (110 km/h) and there were wind gusts to 85 m.p.h. (135 km/h).  The minimum surface pressure was 981 mb.

Tropical Storm Dujuan strengthened on Thursday as it moved over the Western North Pacific Ocean east of Iwo To.  More thunderstorms developed near the center of Dujuan’s circulation.  Thunderstorms were also occurring in bands in the northern side of Tropical Storm Dujuan.  Bands in the southern half of Dujuan’s circulation consisted primarily of showers and lower clouds.  Storms near the center of Dujuan generated upper level divergence that pumped mass away from the tropical storm.  The removal of mass caused the surface pressure to decrease.

The circulation around Tropical Storm Dujuan was large.  Winds to tropical storm force extended out 290 miles (465 km) from the center of Dujuan’s circulation.

Tropical Storm Dujuan will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  Dujuan will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the northern part of an upper level low that is south of Iwo To.  The upper level low will produce easterly winds that will blow toward the top of Dujuan’s circulation.  Those winds will cause moderate vertical wind shear.  The moderate vertical wind shear will inhibit intensification, but the wind shear may not be enough to prevent intensification.  Tropical Storm Dujuan could intensify to a typhoon during the next 24 hours.

The upper level low that is south of Iwo To will pull Tropical Storm Dujuan toward the west during the next 24 hours.  On its anticipated track, the center of Tropical Storm Dujuan will pass north of Iwo To on Friday.

Tropical Storm Dujuan will bring gusty winds and locally heavy rain to Iwo To on Friday.

Tropical Storm Dujuan Forms Northeast of Marianas

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Tropical Storm Dujuan formed over the Western North Pacific Ocean northeast of the Marianas on Wednesday.  At 11:00 a.m. EDT on Wednesday the center of Tropical Storm Dujuan was located at latitude 17.3°N and longitude 149.5°E which put the center about 260 miles (420 km) east-northeast of Saipan.  Dujuan was moving toward the north-northeast at 14 m.p.h. (22 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 994 mb.

A low pressure system over the Western North Pacific Ocean northeast of the Marianas strengthened on Wednesday and the Japan Meteorological Agency designated the system as Tropical Storm Dujuan.

The distribution of thunderstorms in Tropical Storm Dujuan was asymmetrical.  Thunderstorms were occurring in bands in the southern and eastern parts of Dujuan’s circulation.  Bands in the northern and western parts of Tropical Storm Dujian consisted primarily of showers and lower clouds.  Storms near the center of Dujuan generated upper level divergence that pumped mass away to the northeast of the tropical storm.  The removal of mass caused the surface pressure to decrease.

The strongest winds were occurring in the southern part of Tropical Storm Dujuan.  Winds to tropical storm force extended out 150 miles (240 km) in the southern side of Dujuan’s circulation.  The winds in the northern half of Tropical Storm Dujuan were blowing at less than tropical storm force.

Tropical Storm Dujuan will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  Dujuan will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the southeastern part of an upper level low that is north of the Marianas.  The upper level low will produce southwesterly winds that will blow toward the top of Dujuan’s circulation.  Those winds will cause moderate vertical wind shear.  The moderate vertical wind shear will inhibit intensification, but the wind shear may not be enough to prevent intensification.  Tropical Storm Dujuan is likely to intensify gradually during the next 24 hours.

The upper level low that is north of the Marianas will pull Tropical Storm Dujuan toward the north during the next 24 hours.  On its anticipated track, Tropical Storm Dujuan will move north of the Marianas.  The center of Dujuan could be near Iwo To in 48 hours.

Norbert Weakens to a Tropical Depression

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Former Tropical Storm Norbert weakened to a tropical depression as it moved over the Central North Pacific Ocean on Monday evening.  At 11:00 p.m. EDT on Monday the center of Tropical Depression Norbert was located at latitude 20.2°N and longitude 140.5°W which put the center about 950 miles (1525 km) east of Hilo, Hawaii.  Norbert was moving toward the west-northwest at 15 m.p.h. (24 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 1006 mb.

Former Tropical Storm Norbert weakened to a tropical depression on Monday evening.  Drier air caused many of the thunderstorms in Tropical Depression Norbert to weaken on Monday.  A few thunderstorms were still occurring in bands on the periphery of Norbert’s circulation.  Many of the bands revolving around the center of Tropical Depression Norbert consisted primarily of showers and lower clouds.  Since there were few thunderstorms near the center of Norbert, there was very little upper level divergence.  Convergence of mass in the lower levels of the atmosphere caused the surface pressure to increase on Monday.

Tropical Depression Norbert will move through an environment that will be unfavorable for intensification during the next 24 hours.  Norbert will move over water where the Sea Surface Temperatures are near 26°C.  An upper level low that is northeast of Hawaii will continue to produce southwesterly winds that will blow toward the top of Norbert’s circulation.  Those winds will continue to cause moderate vertical wind shear.  Norbert will also continue to move through a mass of drier air that is east of Hawaii.  Tropical Depression Norbert is likely to continue to weaken on Tuesday because of the moderate vertical wind shear and the drier air.

Tropical Depression Norbert will move around the southern part of a high pressure system that is over the Central North Pacific Ocean.  The high pressure system will steer Norbert toward the west during the next 24 hours,  On its anticipated track, Tropical Depression Norbert will still be far to the east of Hawaii on Tuesday.

Elsewhere, Tropical Depression Fifteen-E continued to move farther away from Baja California.

At 11:00 p.m. EDT on Monday the center of Tropical Depression Fifteen-E was located at latitude 16.5°N and longitude 121.6°W which put the center about 880 miles (1415 km) west-southwest of the southern tip of Baja California.  The tropical 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 1005 mb.

Tropical Storm Norbert Still Moving West

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Tropical Storm Norbert was still moving west toward the Central North Pacific Ocean on Sunday evening.  At 11:00 p.m. EDT on Sunday the center of Tropical Storm Norbert was located at latitude 19.2°N and longitude 135.3°W which put the center about 1290 miles (2075 km) east of Hilo, Hawaii.  Norbert was moving toward the west-northwest at 14 m.p.h. (22 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.

Tropical Storm Norbert did not change much on Sunday.  The distribution of thunderstorms in Norbert continued to be asymmetrical.  Thunderstorms were still occurring in bands in the eastern side of Norbert’s circulation.  Bands in the western half of Tropical Storm Norbert consisted primarily of showers and lower clouds.  Storms near the center of Norbert still generated some upper level divergence that pumped mass away from the tropical storm.  The removal of mass in the upper levels was nearly equal to the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure remained steady on Sunday.

The asymmetrical distribution of thunderstorms in Tropical Storm Norbert also affected the distribution of wind speeds.  Winds to tropical storm force extended out 105 miles (165 km) in the northern half of Norbert’s circulation.  Winds to tropical storm force only extended out 35 miles (55 km) in the southern side of Tropical Storm Norbert.

Tropical Storm Norbert will move through an environment that will be mostly unfavorable for intensification during the next 24 hours.  Norbert will move over water where the Sea Surface Temperatures are near 26°C.  An upper level low that is northeast of Hawaii will produce southwesterly winds that will blow toward the top of Norbert’s circulation.  Those winds will continue to cause moderate vertical wind shear.  Norbert will also continue to move through the mass of drier air that is east of Hawaii.  Tropical Storm Norbert is unlikely to intensify on Monday because of the moderate vertical wind shear and the drier air.

Tropical Storm Norbert will move around the southern part of a high pressure system that is over the Eastern North Pacific Ocean.  The high pressure system will steer Norbert toward the west during the next 24 hours,  On its anticipated track, Tropical Storm Norbert will still be far to the east of Hawaii on Monday.

Elsewhere, Tropical Depression Fifteen-E formed southwest of Baja California.

At 11:00 p.m. EDT on Sunday the center of Tropical Depression Fifteen-E was located at latitude 17.0°N and longitude 118.3°W which put the center about 680 miles (1095 km) southwest of the southern tip of Baja California.  The tropical 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 1006 mb.

Tropical Storm Norbert Churns West

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Tropical Storm Norbert churned west toward the Central North Pacific Ocean on Saturday.  At 11:00 p.m. EDT on Saturday the center of Tropical Storm Norbert was located at latitude 17.9°N and longitude 130.5°W which put the center about 1610 miles (2595 km) east of Hilo, Hawaii. Norbert was moving toward the west at 12 m.p.h. (19 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.

Tropical Storm Norbert weakened on Saturday.  A large upper level low that was northeast of Hawaii produced southwesterly winds that blew toward the top of Norbert’s circulation.  Those winds caused moderate vertical wind shear.  In addition, Norbert moved into a mass of drier air that was east of Hawaii.  The moderate vertical wind shear and drier air caused Tropical Storm Norbert to weaken on Saturday.

The moderate vertical wind shear and drier air also caused many of the thunderstorms in Tropical Storm Norbert to weaken.  Thunderstorms were still occurring in bands in the northern side of Norbert’s circulation.  Bands in the southern half of Tropical Storm Norbert consisted primarily of showers and lower clouds.  Since there were fewer thunderstorms near the center of Norbert’s circulation, those storms generated less upper level divergence.  The removal of less mass caused the surface pressure to increase on Saturday.

The asymmetrical distribution of thunderstorms in Tropical Storm Norbert also affected the distribution of wind speeds.  Winds to tropical storm force extended out 105 miles (165 km) in the northern half of Norbert’s circulation.  Winds to tropical storm force only extended out 35 miles (55 km) in the southern side of Tropical Storm Norbert.

Tropical Storm Norbert will move through an environment that will be mostly unfavorable for intensification during the next 24 hours.  Norbert will move over water where the Sea Surface Temperatures are near 26°C.  The upper level low that is northeast of Hawaii will continue to produce moderate vertical wind shear.  Norbert will also continue to move through the mass of drier air that is east of Hawaii.  Tropical Storm Norbert is unlikely to intensify on Sunday because of the moderate vertical wind shear and the drier air.

Tropical Storm Norbert will move around the southern part of a high pressure system that is over the Eastern North Pacific Ocean.  The high pressure system will steer Norbert toward the west during the next 24 hours,  On its anticipated track, Tropical Storm Norbert will move toward Hawaii on Sunday.

Tropical Storm Norbert Strengthens

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Tropical Storm Norbert strengthened as it moved over the Eastern North Pacific Ocean on Friday.  At 11:00 a.m. EDT on Friday the center of Tropical Storm Norbert was located at latitude 16.6°N and longitude 124.7°W which put the center about 2005 miles (3225 km) east of Hilo, Hawaii.  Norbert was moving toward the west at 14 m.p.h. (22 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 996 mb.

More thunderstorms formed near the center of Tropical Storm Norbert as it strengthened.  Thunderstorms were also occurring in bands in the eastern side of Norbert’s circulation.  Bands in the western half of Tropical Storm Norbert still consisted primarily of showers and lower clouds.  Storms near the center of Norbert generated upper level divergence that pumped mass away from the tropical storm.  The removal of mass caused the surface pressure to decrease.

The size of the circulation around Tropical Storm Norbert increased on Friday.  Winds to tropical storm force extended out 105 miles (165 km) from the center of Norbert’s circulation.

Tropical Storm Norbert will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  Norbert will move over water where the Sea Surface Temperatures are near 29°C.  However, an upper level low that is west of Baja California will produce westerly winds that will blow toward the top of Norbert’s circulation.  Those winds will cause some vertical wind shear.  The vertical wind shear will inhibit intensification, but the wind shear will not be enough to prevent intensification.  Tropical Storm Norbert is will intensify during the next 24 hours.  Norbert is likely to strengthen to a hurricane during the weekend.

Tropical Storm Norbert will move around the southern part of a high pressure system that is over the Eastern North Pacific Ocean.  The high pressure system will steer Norbert toward the west during the next 24 hours,  On its anticipated track, Tropical Storm Norbert will move toward Hawaii during the next few days.

Tropical Storm Norbert Develops Southwest of Baja California

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Tropical Storm Norbert developed over the Eastern North Pacific Ocean southwest of Baja California on Wednesday night.  At 5:00 a.m. EDT on Thursday the center of Tropical Storm Norbert was located at latitude 16.4°N and longitude 117.9°W which put the center about 685 miles (1105 km) southwest of the southern tip of Baja California.  Norbert was moving toward the west at 13 m.p.h. (21 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 1004 mb.

A low pressure system over the Eastern North Pacific Ocean southwest of Baja California strengthened on Wednesday night and the U.S. National Hurricane Center designated the system as Tropical Storm Norbert.

The distribution of thunderstorms in Tropical Storm Norbert was asymmetrical.  Thunderstorms were occurring in bands in the eastern side of Norbert’s circulation.  Bands in the western side of Tropical Storm Norbert consisted primarily of showers and lower clouds.

An upper level low that was west of Baja California was producing westerly winds that were blowing toward the top of Tropical Storm Norbert.  Those winds were causing moderate vertical wind shear.  The moderate vertical wind shear was causing the asymmetrical distribution of thunderstorms.

The strongest winds were blowing in the northeastern part of Tropical Storm Norbert.  Winds to tropical storm force extended out 60 miles (95 km) in the northeastern quadrant of Norbert’s circulation.  The winds in the other parts of Tropical Storm Norbert were blowing at less than tropical storm force.

Tropical Storm Norbert will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  Norbert will move over water where the Sea Surface Temperatures are near 29°C.  However, the upper level low west of Baja California will continue to cause moderate vertical wind shear.  The vertical wind shear will inhibit intensification.  Tropical Storm Norbert is likely to intensify slowly because of the moderate vertical wind shear.

Tropical Storm Norbert will move around the southern part of a high pressure system that is over the Eastern North Pacific Ocean.  The high pressure system will steer Norbert toward the west during the next 24 hours,  On its anticipated track, Tropical Storm Norbert will move farther away from Baja California.

Elsewhere, Tropical Storm Lowell continued to spin far to the northwest of Hawaii.

At 5:00 a.m. EDT on Thursday the center of Tropical Storm Lowell was located at latitude 29.2°N and longitude 166.2°W which put the center about 655 miles (1050 km) northwest of Lihue, Hawaii.  Lowell was moving toward the west at 13 m.p.h. (21 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 993 mb.

Lowell Weakens to a Tropical Storm

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Former Hurricane Lowell weakened to a tropical storm as it moved away from Kauai on Tuesday evening.  At 11:00 a.m. EDT on Tuesday the center of Tropical Storm Lowell was located at latitude 26.2°N and longitude 161.1°W which put the center about 310 miles (500 km) north-northwest of Lihue, Hawaii.  Lowell was moving toward the north at 18 m.p.h. (30 km/h).  The maximum sustained wind speed was 70 m.p.h. (110 km/h) and there were wind gusts to 85 m.p.h. (135 km/h).  The minimum surface pressure was 978 mb.

Former Hurricane Lowell weakened to a tropical storm on Tuesday evening.  A large upper level trough that was south of the Aleutian Islands was producing strong southerly winds that were blowing toward the top of Lowell’s circulation.  Those winds were causing strong vertical wind shear.

The strong vertical wind shear was affecting the structure of Tropical Storm Lowell.  Thunderstorms were still occurring in bands in the northern half of Lowell’s circulation.  Bands in the southern half of Tropical Storm Lowell consisted primarily of showers and lower clouds.  Storms near the center of Lowell generated upper level divergence that pumped mass away to the north of the tropical storm.  The removal of mass in the upper levels was less than the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure increased on Tuesday.

The strong vertical wind shear also caused the distribution of wind speeds in Tropical Storm Lowell to become more asymmetrical.  Winds to tropical storm force extended out 250 miles (400 km) in the northern side of Lowell’s circulation.  Winds to tropical storm force extended out 160 miles (260 km) in the southern side of Tropical Storm Lowell.

Tropical Storm Lowell will move through an environment that will be unfavorable for intensification during the next 24 hours.  Lowell will move over water where the Sea Surface Temperatures are near 26°C.  However, the upper level trough that is south of the Aleutian Islands will continue to cause strong vertical wind shear.  Tropical Storm Lowell will continue to weaken on Wednesday because of the strong vertical wind shear.

Tropical Storm Lowell will move south the southern side of a high pressure system that is over the North Pacific Ocean.  The high pressure system will steer Lowell toward the west during the next 24 hours.  On its anticipated track, Tropical Storm Lowell will move farther away from Hawaii.