Tag Archives: Geraldton

Tropical Cyclone Narelle Brings Wind and Rain to Western Australia

Tropical Cyclone Narelle brought wind and rain to Western Australia on Friday.  At 11:00 a.m. EDT on Friday the center of Tropical Cyclone Narelle was located at latitude 26.5°S and longitude 114.8°E which put the center about 85 miles (135 km) east-southeast of Denham, Australia.  Narelle was moving toward the south-southeast at 22 m.p.h. (35 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 977 mb.

The Australian Bureau of Meteorology issued a Warning that is in effect for the portion of the coast from Carnarvon to Jurien Bay.  The Warning includes  Denham and Geraldton.

Tropical Cyclone Narelle continued to bring strong winds and locally heavy rain on Friday as it moved farther inland over Western Australia.  Narelle was weakening gradually as it moved farther inland.

A weather station in Learmonth, Australia measured a sustained wind speed of 86 m.p.h. (139 km/h) and a wind gust of 120 m.p.h. (193 km/h).  The weather station also measured 13.58 inches (345 mm) of rain.  The weather radar in Learmonth was unavailable because of damage caused by Tropical Cyclone Narelle.

A weather station in Carnarvon, Australia measured a sustained wind speed of 52 m.p.h. (84 km/h) and a wind gust of 70 m.p.h. (113 km/h).

The circulation around Tropical Cyclone Narelle was still large.  Winds to hurricane/typhoon force extended out 45 miles (75 km) from the center of Narelle’s circulation.  Winds to tropical storm force extended out 180 miles (290 km) from the center of Tropical Cyclone Narelle.

Tropical Cyclone Narelle will move around the eastern part of an upper level trough that is southwest of Australia.  The upper level trough will steer Narelle toward the south-southeast during the next 24 hours.  On its anticipated track, Tropical Cyclone Narelle will continue to inland over Western Australia.  The center of Narelle’s circulation will pass eastnof Perth in 12 to 18 hours.

Tropical Cyclone Narelle will continue to bring strong winds and heavy rain to parts of Western Australia.  Heavy rain could cause flash floods in some locations.

Flood Watches are in effect for western parts of the Pilbara, Gascoyne, Central Coastal, and Lower West Coast catchments.

A Minor Flood Warning is in effect for the Gascoyne River.

 

Tropical Cyclone Narelle Rapidly Intensifies to Equivalent of a Major Hurricane

Tropical Cyclone Narelle rapidly intensified to the equivalent of a major hurricane on Wednesday.  At 5:00 p.m. EDT on Wednesday the center of Tropical Cyclone Narelle was located at latitude 18.6°S and longitude 116.8°E which put the center about 150 miles (240 km) north of Karratha, Australia.  Narelle was moving toward the west-southwest at 9 m.p.h. (15 km/h).  The maximum sustained wind speed was 120 m.p.h. (195 km/h) and there were wind gusts to 150 m.p.h. (240 km/h).  The minimum surface pressure was 954 mb.

The Australian Bureau of Meteorology issued a Warning that is in effect for the portion of the coast from Pardoo Roadhouse to Cape Cuvier.  The Warning includes Port Hedland, Karratha, Onslow, Exmouth, and Coral Bay.

A Watch is in effect for the portion of the coast from Cape Cuvier to Dongara.  The Watch includes Carnarvon, Denham, and Geraldton.

Tropical Cyclone Narelle rapidly intensified to the equivalent of a major hurricane on Wednesday.  The inner end of a rainband wrapped around the center of Narelle’s circulation.  A large circular eye with a diameter of 45 miles (75 km) formed at the center of Tropical Cyclone Narelle.  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 Narelle’s circulation.  Storms near the center of Narelle generated upper level divergence that pumped mass away from the tropical cyclone.  The removal of mass caused the surface pressure to decrease.

The size of the circulation around Tropical Cyclone Narelle increased significantly on Wednesday.  Winds to hurricane/typhoon force extended out 80 miles (130 km) from the center of Narelle’s circulation.  Winds to tropical storm force extended out 185 miles (295 km) from the center of Tropical Cyclone Narelle.

The Hurricane Intensity Index (HII) for Tropical Cyclone Narelle was 22.1  The Hurricane Size Index (HSI) was 24.7 and the Hurricane Wind Intensity Size Index (HWISI) was 46.8.  Tropical Cyclone Narelle was similar in size and intensity to Hurricane Jeanne when Jeanne hit southern Florida in 2004.

Tropical Cyclone Narelle will move through an environment favorable for intensification during the next 24 hours.  Narelle will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the northern part of an upper level ridge that is over Western Australia.  The upper level ridge will produce easterly winds that will blow toward the top of Narelle’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Tropical Cyclone Narelle will intensify during the next 24 hours.

Tropical Cyclone Narelle will move around the western side of a high pressure system that is over Australia.  The high pressure system will steer Narelle toward the southwest during the next 24 hours.  On its anticipated track, Tropical Cyclone Narelle will approach the coast of Western Australia near Exmouth in 24 hours.  Narelle will move toward the south on Friday when it moves around the western end of the high pressure system.

Tropical Cyclone Narelle will bring strong winds and heavy rain to the coast of Western Australia.  Narelle will be capable of causing major damage.  Heavy is likely to cause flash floods in some locations.

Flood Watches are in effect for western parts of the Pilbara, Gascoyne, Central Coastal, and Lower West Coast catchments.

Tropical Cyclone Narelle could also cause a storm surge of up to 13 feet (4 meters) along parts of the coast.

Tropical Cyclone Sean Continues to Weaken

Tropical Cyclone Sean continued to weaken steadily on Wednesday.  At 10:00 a.m. EST on Wednesday the center of Tropical Cyclone Sean was located at latitude 28.5°S and longitude 107.4°E which put the center about 440 miles (740 km) west of Geraldton, Australia.  Sean was moving toward the south-southeast 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 992 mb.

The effects of cooler Sea Surface Temperatures and strong vertical wind shear caused Tropical Cyclone Sean to continue to weaken on Wednesday.  An upper level trough over the South Indian Ocean west of Australia was producing strong northwesterly winds that were blowing across the top of Sean’s circulation.  Those winds were causing strong vertical wind shear.  The strong upper level winds also blew the tops off of thunderstorms that had been in the southeastern part of Tropical Cyclone Sean.  Bands revolving around the center of Sean’s circulation consisted primarily of showers and lower clouds.

Winds to tropical storm force extended out 130 miles (210 km) from the center of Tropical Cyclone Sean.

Tropical Cyclone Sean will move through an environment that will be unfavorable for intensification during the next 24 hours.  Sean will move over water where where the Sea Surface Temperatures are near 24°C.  It will move under the eastern part of the upper level trough over the South Indian Ocean.  The upper level trough will continue to produce strong northwesterly winds are that will blow toward the top of Sean’s circulation.  Those winds will cause strong vertical wind shear.  The combination of cooler water and strong vertical wind shear will cause Tropical Cyclone Sean to continue to weaken during the next 24 hours.

Tropical Cyclone Sean will move around the western part of a high pressure system over Australia.  The high pressure system will steer Sean toward the south-southeast during the next 24 hours.  On its anticipated track, Tropical Cyclone Sean will move parallel to the coast of Western Australia.

Tropical Cyclone Seroja Brings Wind and Rain to Western Australia

Tropical Cyclone Seroja brought wind and rain to Western Australia on Sunday. At 8:00 a.m. EDT on Sunday the center of Tropical Cyclone Seroja was located at latitude 28.1°S and longitude 114.3°E which put it about 30 miles (45 km) south-southeast of Kalbarri, Australia. Seroja was moving toward the southeast at 26 m.p.h. (43 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 976 mb.

A Tropical Cyclone Warning was in effect from Overlander Roadhouse to Lancelin. The Warning extended inland to Merredin.

Tropical Cyclone Seroja made landfall on the coast of Western Australia between Kalbarri and Geraldton. Seroja strengthened to the equivalent of a hurricane/typhoon before it made landfall. The airport at Geraldton was reporting sustained winds to 56 m.p.h. (91 km/h) and wind gusts to 75 m.p.h. (120 km/h) as the center of Tropical Cyclone Seroja approached the station.

Tropical Cyclone Seroja will move rapidly across the southwestern part of Western Australia during the next 24 hours. Seroja will bring gusty winds and it will drop locally heavy rain over parts of Western Australia. Flood Watches have been issued for the Wooramel, Murchison, Greenough, Yarra Yarra Lakes, Avon River and parts of the Salt Lake Catchments.

Tropical Cyclone Seroja Prompts Watch for Western Australia

A potential threat posed by Tropical Cyclone Seroja prompted the issuance of a Watch for the coast of Western Australia. At 11:00 p.m. EDT on Thursday the center of Tropical Cyclone Seroja was located at latitude 19.2°S and longitude 109.8°E which put it about 315 miles (505 km) northwest of Exmouth, Australia. Seroja was moving toward the southwest 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 65 m.p.h. (105 km/h). The minimum surface pressure was 994 mb.

A Tropical Cyclone Watch was issued for the portion of the coast of Western Australia from Coral Bay to Lancelin. The Watch included Carnarvon, Denham, Kalbarri and Geraldton.

More thunderstorms developed in bands revolving around the center of Tropical Cyclone Seroja on Thursday night. The distribution of thunderstorms was more symmetrical, which indicated that the vertical wind shear was decreasing. Thunderstorms near the center of circulation generated upper level divergence that pumped mass away from the tropical cyclone. Winds to tropical storm force extended out 115 miles (185 km) from the center of Seroja.

Tropical Cyclone Seroja will move through an environment favorable for intensification during the next 36 hours. Seroja will move over water where the Sea Surface Temperatures will be near 30°C. It will move under the axis of an upper level ridge centered northwest of Australia during the next 24 hours. The upper level winds are weaker near the axis of the ridge and the wind shear will decrease. Tropical Cyclone Seroja could strengthen into the equivalent of a hurricane/typhoon during the next 24 hours. Seroja could strengthen more rapidly if the inner end of a rainband wraps around the center and an inner core forms.

Tropical Cyclone Seroja will move around the northwestern part of a high pressure system over Australia during the next day or so. The high will steer Seroja toward the southwest during the next 24 hours. An upper level trough over the South Indian Ocean will approach Tropical Cyclone Seroja from the west during the weekend. The trough will turn Seroja toward the southeast. On its anticipated track Tropical Cyclone Seroja will make landfall on the coast of Western Australia between Denham and Lancelin in 60 hours.

Elsewhere over the South Indian Ocean, Tropical Cyclone Odette was interacting with the northwest side of Tropical Cyclone Seroja. At 11:00 p.m. EDT on Thursday the center of Tropical Cyclone Odette was located at latitude 14.5°S and longitude 108.2°E which put it about 675 miles (1090 km) northwest of Exmouth, Australia. Odette was moving toward the east at 9 m.p.h. (15 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 988 mb. Even though the wind speeds are stronger in Tropical Cyclone Odette than they are in Tropical Cyclone Seroja, the circulation around Seroja is larger. The circulation of Odette is forecast to absorbed by the larger circulation of Seroja. In addition, upper level divergence from Seroja will cause vertical wind shear over Odette, which will also cause the circulation around Odette to weaken.