Tropical Cyclone Olga Weakens

Tropical Cyclone Olga weakened over the South Indian Ocean north of Western Australia on Monday. At 11:00 p.m. EDT on Monday the center of Tropical Cyclone Olga was located at latitude 17.5°S and longitude 117.2°E which put it about 250 miles (400 km) north of the Karratha, Australia. Olga was moving toward the southwest at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h). The minimum surface pressure was 994 mb.

Strong vertical wind shear caused Tropical Cyclone Olga to weaken steadily on Monday. An upper level trough over the South Indian Ocean west of Australia produced strong northwesterly winds that blew toward the top of Olga’s circulation. Those winds caused strong vertical wind shear. The wind shear caused the distribution of thunderstorms in Tropical Cyclone Olga to become asymmetrical. Thunderstorms were occurring in bands in the southeastern part of Olga’s circulation. Bands in the other parts of Tropical Cyclone Olga consisted primarily of showers and lower clouds.

The strong vertical wind shear also caused the pattern of wind speeds around Tropical Cyclone Olga to become asymmetrical. Winds to tropical storm force extended out 145 miles (235 km) in the southern half of Olga’s circulation. Winds to tropical storm force only extended out 75 miles in the northern half of Tropical Cyclone Olga.

Tropical Cyclone Olga will move through an environment that will be unfavorable for intensification during the next 24 hours. Olga will move over water where the Sea Surface Temperatures are near 28°C. However, the upper level trough west of Australia will continue to cause strong vertical wind shear. The strong wind shear will cause Tropical Cyclone Olga to continue to weaken.

Tropical Cyclone Olga will move around the northwestern part of a high pressure system over Australia. The high pressure system will steer Olga toward the southwest during the next 24 hours. On its anticipated track, Tropical Cyclone Olga will gradually move closer to the coast of Western Australia.

Tropical Cyclone Olga brought strong gusty winds to the area around Rowley Shoals. A weather station on Rowley Shoals reported a sustained wind speed of 48 m.p.h. (78 km/h) and a wind gust of 61 m.p.h. (98 km/h). Olga could bring strong gusty winds to Barrow Island during the next 24 hours.

Tropical Cyclone Olga Rapidly Intensifies to Equivalent of Cat. 4 Hurricane

Tropical Cyclone Olga rapidly intensified to the equivalent of a Category 4 hurricane on the Saffir-Simpson Scale during Sunday morning. At 11:00 a.m. EDT on Sunday the center of Tropical Cyclone Olga was located at latitude 15.6°S and longitude 119.1°E which put it about 365 miles (590 km) north of the Port Hedland, Australia. Olga was moving toward the south-southwest at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 140 m.p.h. (235 km/h) and there were wind gusts to 165 m.p.h. (265 km/h). The minimum surface pressure was 939 mb.

Tropical Cyclone Olga rapidly intensified to the equivalent of a Category 4 hurricane over the South Indian Ocean north of Western Australia during Sunday morning. A small circular eye with a diameter of 10 miles (16 km) was present at the center of Olga’s circulation. The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Tropical Cyclone Olga. Storms near the core generated strong upper level divergence that pumped mass away from the tropical cyclone. The removal of large quantities of mass caused the surface pressure to decrease rapidly.

The circulation around Tropical Cyclone Olga was small. Winds to hurricane/typhoon force extended out 20 miles (30 km) from the center of Olga’s circulation. Winds to tropical storm force extended out 85 miles (135 km) from the center of circulation. The Hurricane Intensity Index (HII) for Tropical Cyclone Olga was 28.3. The Hurricane Size Index (HSI) was 6.1 and the Hurricane Wind Intensity Size Index (HWISI) was 34.4.

Hurricane Olga will move into an environment that will become unfavorable for intensification during the next 24 hours. Olga will move over water where the Sea Surface Temperatures are near 28°C. An upper level trough over the South Indian Ocean will approach Tropical Cyclone Olga from the west. The trough will produce strong westerly winds that will blow toward the top of Olga’s circulation. Those winds will cause the vertical wind shear to increase. Tropical Cyclone Olga will start to weaken when the wind shear increases. Olga could weaken rapidly because of the small size of its circulation.

Tropical Cyclone Olga will move around the northwestern part of a high pressure system over Australia. The high pressure system will steer Olga toward the southwest during the next 24 hours. On its anticipated track, Tropical Cyclone Olga will move parallel to the coast of Western Australia. Olga is forecast to turn more toward the west-southwest on Monday. Tropical Cyclone Olga is expected to have a minimal impact on Western Australia. Olga will bring gusty winds and large waves to the area around Rowley Shoals.

Tropical Cyclone Olga Rapidly Intensifies to Equivalent of a Major Hurricane

Tropical Cyclone Olga rapidly intensified to the equivalent of a major hurricane on Saturday night. At 5:00 a.m. EDT on Sunday the center of Tropical Cyclone Olga was located at latitude 15.0°S and longitude 119.1°E which put it about 405 miles (655 km) north of the Port Hedland, Australia. Olga was moving toward the southwest at 5 m.p.h. (8 km/h). The maximum sustained wind speed was 115 m.p.h. (185 km/h) and there were wind gusts to 145 m.p.h. (235 km/h). The minimum surface pressure was 958 mb.

Tropical Cyclone Olga rapidly intensified to the equivalent of a major hurricane over the South Indian Ocean north of Western Australia on Saturday night. A small circular eye with a diameter of 10 miles (16 km) was present at the center of Olga’s circulation. The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the core of Tropical Cyclone Olga. Storms near the core generated strong upper level divergence that pumped mass away from the tropical cyclone. The removal of large quantities of mass caused the surface pressure to decrease rapidly.

The circulation around Tropical Cyclone Olga was small, but it was symmetrical. Winds to hurricane/typhoon force extended out 20 miles (30 km) from the center of Olga’s circulation. Winds to tropical storm force extended out 75 miles (120 km) from the center of circulation. The Hurricane Intensity Index (HII) for Tropical Cyclone Olga was 20.6. The Hurricane Size Index (HSI) was 7.2 and the Hurricane Wind Intensity Size Index (HWISI) was 27.8.

Hurricane Olga will move into an environment that will become unfavorable for intensification during the next 24 hours. Olga will move over water where the Sea Surface Temperatures are near 28°C. An upper level trough over the South Indian Ocean will approach Tropical Cyclone Olga from the west. The trough will produce strong westerly winds that will blow toward the top of Olga’s circulation. Those winds will cause the vertical wind shear to increase. Tropical Cyclone Olga could continue to intensify during the next few hours, but Olga will start to weaken when the wind shear increases.

Tropical Cyclone Olga will move around the northwestern part of a high pressure system over Australia. The high pressure system will steer Olga toward the southwest during the next 24 hours. On its anticipated track, Tropical Cyclone Olga will move parallel to the coast of Western Australia. Olga is forecast to turn more toward the west-southwest on Monday. Tropical Cyclone Olga is forecast to have a minimal impact on Western Australia. Olga will bring gusty winds and large waves to the area around Rowley Shoals.

Tropical Cyclone Olga Strengthens to Equivalent of a Hurricane/Typhoon

Tropical Cyclone Olga strengthened to the equivalent of a hurricane/typhoon over the South Indian Ocean northwest of Australia on Saturday. At 5:00 p.m. EDT on Saturday the center of Tropical Cyclone Olga was located at latitude 14.5°S and longitude 119.6°E which put it about 435 miles (700 km) north of the Port Hedland, Australia. Olga was moving toward the south-southwest 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.

Tropical Cyclone Olga strengthened to the equivalent of a hurricane/typhoon northwest of Australia on Saturday. The inner end of a rainband wrapped around the center of Olga’s circulation. A circular eye with a diameter of 16 miles (26 km) formed at the center of Tropical Cyclone Olga. Bands of showers and thunderstorms were revolving around the center of circulation. Storms near the center of Olga generated upper level divergence that pumped mass away from the tropical cyclone. Winds to hurricane/typhoon force extended out 20 miles (30 km) from the center of Tropical Cyclone Olga. Winds to tropical storm force extended out 75 miles (120 km) from the center of Olga’s circulation.

Tropical Cyclone Olga will move through an environment favorable for intensification during the next 24 hours. Olga will move over water where the Sea Surface Temperatures are near 29°C. It will move under the western part of the axis an upper level ridge over northern Australia. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. Tropical Cyclone Olga will continue to intensify during the next 24 hours.

Tropical Cyclone Olga will move around the northwestern part of a high pressure system over Australia. The high pressure system will steer Olga slowly toward the southwest during the next 24 hours. On its anticipated track, Tropical Cyclone Olga will parallel to the coast of Western Australia. Olga is forecast to turn more toward the west-southwest on Monday. Tropical Cyclone Olga is forecast to have a minimal impact on Western Australia.

Tropical Cyclone Olga Forms Northwest of Australia

Tropical Cyclone Olga formed northwest of Australia on Friday night. At 11:00 p.m. EDT on Friday the center of Tropical Cyclone Olga was located at latitude 12.95°S and longitude 120.1°E which put it about 520 miles (840 km) north of the Port Hedland, Australia. Olga was moving toward the south at 4 m.p.h. (6 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 998 mb.

A low pressure system over the South Indian Ocean between Indonesia and Australia strengthened on Friday night and the Australian Bureau of Meteorology designated the system as Tropical Cyclone Olga. The circulation around Tropical Cyclone Olga exhibited more organization on Friday night. A band of thunderstorms wrapped around the center of Olga’s circulation. Other bands of showers and thunderstorms were revolving around the center of circulation. Storms near the center of Olga generated upper level divergence that pumped mass away from the tropical cyclone. Winds to tropical storm force extended out 60 miles (95 km) from the center of Tropical Cyclone Olga.

Tropical Cyclone Olga will move through an environment favorable for intensification during the next 24 hours. Olga 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. Tropical Cyclone Olga will intensify during the next 24 hours. Olga could strengthen to the equivalent of a hurricane/typhoon.

Tropical Cyclone Olga will move around the northwestern part of a high pressure system over Australia. The high pressure system will steer Olga slowly toward the south during the next 24 hours. On its anticipated track, Tropical Cyclone Olga will move a little closer to Western Australia. Olga is forecast to turn more toward the west later in the weekend. Tropical Cyclone Olga is forecast to have a minimal impact on Western Australia.

Tropical Cyclone Gamane Brings Wind and Rain to Northern Madagascar

Tropical Cyclone Gamane brought strong winds and heavy rain to northern Madagacar on Wednesday. At 11:00 a.m. EDT on Wednesday the center of Tropical Cyclone Gamane was located at latitude 13.5°S and longitude 49.1°E which put it about 25 miles (40 km) south of the Ambilobe, Madagascar. Gamane was moving toward the southwest at 6 m.p.h. (10 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 991 mb.

Tropical Cyclone Gamane rapidly intensified to the equivalent of a hurricane/typhoon before it made landfall on the coast of northern Madagascar near Iharana on Tuesday night. The circulation around Gamane was small at the time of landfall. Winds to hurricane/typhoon force extended out 25 miles (40 km) from the center of Tropical Cyclone Gamane at the time of landfall. Winds to tropical storm force only extended out 65 miles (105 km) from the center of Gamane’s circulation.

Tropical Cyclone Gamane weakened after the center of circulation moved over land. However, the circulation around Tropical Cyclone Gamane remained well organized. Thunderstorms were still occurring near the center of Gamane’s circulation. Bands of showers and thunderstorms were revolving around the center of circulation. Storms near the center of Gamane generated upper level divergence that pumped mass away from the tropical cyclone. Winds to tropical storm force extended out 65 miles (105 km) from the center of Tropical Cyclone Gamane.

Tropical Cyclone Gamane will move around the western end of a high pressure system over the South Indian Ocean. The high pressure system will steer Gamane toward the south during the next 24 hours. On its anticipated track, Tropical Cyclone Gamane will move toward the south over northern Madagascar. Gamane will continue to weaken while the center of circulation is over land. Even though Tropical Cyclone Gamane will weaken, it will continue to drop heavy rain over parts of northern Madagascar. Heavy rain will cause floods in some locations.

An upper level trough southwest of Madagascar will start to steer Tropical Cyclone Gamane toward the southeast in a day or so. The center of Gamane is likely to move back over the Southwest Indian Ocean on Friday. Tropical Cyclone Gamane could strengthen once the center of circulation moves back over water. Gamane could affect La Reunion and Mauritius during the weekend.

Tropical Cyclone Gamane Forms Near Northern Madagascar

Tropical Cyclone Gamane formed over the South Indian Ocean near northern Madagascar on Monday night. At 8:00 a.m. EDT on Tuesday the center of Tropical Cyclone Gamane was located at latitude 12.2°S and longitude 50.7°E which put it about 90 miles (145 km) east of the Antsiranana, Madagascar. Gamane was moving toward the northwest at 4 m.p.h. (6 km/h). The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h). The minimum surface pressure was 989 mb.

A low pressure system over the South Indian Ocean near northern Madagascar strengthened during Monday night and Meteo France La Reunion designated the system as Tropical Cyclone Gamane. The circulation around Tropical Cyclone Gamane was organizing quickly. Numerous thunderstorms formed near the center of Gamane’s circulation. Bands of showers and thunderstorms were revolving around the center of circulation. Storms near the center generated upper level divergence that pumped mass away from the tropical cyclone. Winds to tropical storm force extended out 85 miles (135 km) from the center of Tropical Cyclone Gamane.

Tropical Cyclone Gamane will move through an environment favorable for intensification during the next 24 hours. Gamane 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 Southwest Indian Ocean. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. Part of the circulation around the western side of Gamane will move over northern Madagascar, which is the only factor that could inhibit intensification. Tropical Cyclone Gamane will intensify during the next 24 hours. Gamane could intensify rapidly at times. Tropical Cyclone Gamane is likely to strengthen to the equivalent of a hurricane/typhoon, if the center of circulation remains over water.

Tropical Cyclone Gamane will move around the western side of a high pressure system over the South Indian Ocean. The high pressure system will steer Gamane slowly toward the south-southwest during the next 24 hours. On its anticipated track, the center of Tropical Cyclone Gamane will move close to the coast of northeastern Madagascar. The center of circulation could pass very close to Iharana, Sambava, Antalaha, and Ambohitralanana.

Tropical Cyclone Gamane will bring strong winds to the coast of northeastern Madagascar. Gamane will also drop heavy rain over parts of northeastern Madagascar. Tropical Cyclone Gamane will move slowly during the next 24 hours. So, prolonged heavy rain is likely to cause floods in some locations.

Tropical Cyclone Neville Weakens Over South Indian Ocean

Tropical Cyclone Neville weakened over the South Indian Ocean on Sunday. At 11:00 a.m. EDT on Sunday the center of Tropical Cyclone Neville was located at latitude 23.5°S and longitude 88.8°E which put it about 930 miles (1500 km) south-southwest of the Cocos Islands. Neville was moving toward the southwest at 10 m.p.h. (16 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.

Tropical Cyclone Neville was weakening rapidly over the South Indian Ocean on Sunday. Neville was under the eastern part of an upper level trough. The upper level trough was producing strong northwesterly winds that were blowing across the top of Neville’s circulation. Those winds were causing strong vertical wind shear. The strong wind shear was making the distribution of thunderstorms in Tropical Cyclone Neville asymmetrical. Thunderstorms were still occurring in the southeastern quadrant of Neville’s circulation. Bands in the other parts of Tropical Cyclone Neville consisted primarily of showers and lower clouds. Winds to tropical storm force extended out 75 miles (120 km) from the center of circulation.

Tropical Cyclone Neville will move through an environment that will be unfavorable for intensification during the next 36 hours. Neville will move over water where the Sea Surface Temperatures are near 25°C. The upper level trough over the South Indian Ocean will continue to produce strong northwesterly winds that will blow toward the top of Neville’s circulation. Those winds will continue to cause strong vertical wind shear. Tropical Cyclone Neville will weaken during the next 36 hours.

Tropical Cyclone Neville will move around the northern side of a high pressure system over the South Indian Ocean. The high pressure system will steer Neville toward the west-southwest during the next 36 hours. On its anticipated track, Tropical Cyclone Neville will remain far southeast of Diego Garcia.

Tropical Cyclone Neville Passes South of Cocos Islands

Tropical Cyclone Neville passed south of the Cocos Islands on Saturday. At 11:00 a.m. EDT on Saturday the center of Tropical Cyclone Neville was located at latitude 20.8°S and longitude 93.1°E which put it about 630 miles (1015 km) south-southwest of the Cocos, Islands. Neville was moving toward the west-southwest at 16 m.p.h. (26 km/h). The maximum sustained wind speed was 80 m.p.h. (130 km/h) and there were wind gusts to 100 m.p.h. (160 km/h). The minimum surface pressure was 985 mb.

Tropical Cyclone Neville was weakening as it moved over the South Indian Ocean south of the Cocos Islands on Saturday. The distributions of thunderstorms and clouds in Neville was becoming asymmetrical. Some drier air appeared to be entering the northeastern part of Neville’s circulation. Thunderstorms were occurring in bands in the southern and western parts of Tropical Cyclone Neville. Bands in the northern and eastern parts of Neville’s circulation consisted primarily of showers and lower clouds.

Storms near the center of Tropical Cyclone Neville still generated upper level divergence that pumped mass away to the south of the tropical cyclone. Winds to hurricane/typhoon force extended out 25 miles (40 km) from the center of Neville’s circulation. Winds to tropical storm force extended out 130 miles (210 km) from the center of circulation.

Tropical Cyclone Neville will move through an environment that will be unfavorable for intensification during the next 24 hours. Neville will move over water where the Sea Surface Temperatures are near 28°C. However, an upper level trough over the South Indian Ocean will produce northwesterly winds that will blow toward the top of Neville’s circulation. Those winds will also cause the vertical wind shear to increase. Tropical Cyclone Neville will weaken during the next 24 hours.

Tropical Cyclone Neville will move around the northern side of a high pressure system over the South Indian Ocean. The high pressure system will steer Neville toward the west-southwest during the next 24 hours. On its anticipated track, Tropical Cyclone Neville will remain far southeast of Diego Garcia.

Tropical Cyclone Neville Spins Southeast of Cocos Islands

Tropical Cyclone Neville was spinning over the South Indian Ocean southeast of the Cocos Islands on Friday morning. At 11:00 a.m. EDT on Friday the center of Tropical Cyclone Neville was located at latitude 18.6°S and longitude 98.7°E which put it about 445 miles (720 km) south-southeast of the Cocos, Islands. Neville was moving toward the west-southwest at 16 m.p.h. (26 km/h). The maximum sustained wind speed was 105 m.p.h. (165 km/h) and there were wind gusts to 125 m.p.h. (200 km/h). The minimum surface pressure was 968 mb.

A small circular eye with a diameter of 10 miles (16 km) was at the center of Neville’s circulation. The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms. Bands of showers and thunderstorms were revolving around the center of Tropical Cyclone Neville. Storms near the center of Neville generated upper level divergence that pumped mass away from the tropical cyclone.

The circulation around Tropical Cyclone Neville was small. Winds to hurricane/typhoon force extended out 25 miles (40 km) from the center of Neville’s circulation. Winds to tropical storm force extended out 140 miles (220 km) from the center of circulation. The Hurricane Intensity Index (HII) for Tropical Cyclone Neville was 17.8. The Hurricane Size Index (HSI) was 9.0 and the Hurricane Wind Intensity Size Index (HWISI) was 26.8.

Tropical Cyclone Neville will move through an environment that will become less favorable for intensification during the next 24 hours. Neville will move over water where the Sea Surface Temperatures are near 28°C. An upper level trough over the South Indian Ocean will approach Neville’s circulation from the west. The upper level trough will produce northwesterly winds that will blow toward the top of Neville’s circulation. Those winds will also cause the vertical wind shear to increase. Tropical Cyclone Neville is likely to weaken when the vertical wind shear increases.

Tropical Cyclone Neville will move around the northern side of a high pressure system over the South Indian Ocean. The high pressure system will steer Neville toward the west-southwest during the next 24 hours. On its anticipated track, Tropical Cyclone Neville will pass south of the Cocos Islands later today.