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Tropical Cyclone Hayley Brings Wind and Rain to Western Australia

Tropical Cyclone Hayley brought wind and rain to Western Australia on Tuesday.  At 10:00 a.m. EST on Tuesday the center of Tropical Cyclone Hayley was located at latitude 16.7°S and longitude 123.7°E which put the center about 50 miles (80 km) north-northwest of Derby, Australia.  Hayley was moving toward the east at 15 m.p.h. (24 km/h).  The maximum sustained wind speed was 85 m.p.h. (135 km/h) and there were wind gusts to 105 m.p.h. (165 km/h).  The minimum surface pressure was 969 mb.

A Warning was in effect for the region from north of Beagle Bay to south of Kuri Bay, Australia.

Tropical Cyclone Hayley made landfall on the coast of Western Australia south of Lombadina on Tuesday morning.  Hayley moved across the northern part of the Dampier Peninsula.  Tropical Cyclone Haley was currently over King Sound.

The circulation around Tropical Cyclone Hayley was small.  Winds to hurricane/typhoon force extended out 20 miles (30 km) from the center of Hayley’s circulation.  Winds to tropical storm force extended out 100 miles (160 km) from the center of Tropical Cyclone Hayley.

The Hurricane Intensity Index (HII) for Tropical Cyclone Hayley was 12.7.  The Hurricane Size Index (HSI) was 7.9 and the Hurricane Wind Intensity Size Index (HWISI) was 20.6.

Tropical Cyclone Hayley will move around the northeastern part of an upper level trough over Western Australia.  The upper level trough will steer Hayley toward the east during the next 24 hours.  On its anticipated track, Tropical Cyclone Hayley will make another landfall in Western Australia north of Derby in a few hours.

Tropical Cyclone Hayley will bring strong winds and locally heavy to parts of Western Australia north and east of Derby.  Heavy rain could cause flash floods in some locations,

The Australian Bureau of Meteorology has issued a Severe Weather Warning for heavy rainfall for parts of the Kimberley District.

Elsewhere over the South Indian Ocean, Tropical Cyclone Grant was moving south-southeast of Diego Garcia.  At 10:00 a.m. EST on Tuesday the center of Tropical Cyclone Grant was located at latitude 14.8°S and longitude 75.1°E which put the center about 565 miles (910 km) south-southeast of Diego Garcia.  Grant was moving toward the west-southwest at 16 m.p.h. (26 km/h).  The maximum sustained wind speed was 140 m.p.h. (225 km/h) and there were wind gusts to 165 m.p.h. (265 km/h).  The minimum surface pressure was 950 mb.

Tropical Cyclone Hayley Rapidly Intensifies to Equivalent of Hurricane/Typhoon

Tropical Cyclone Hayley rapidly intensified to the equivalent of a hurricane/typhoon northwest of Australia early on Monday.  At 10:00 a.m. EST on Monday the center of Tropical Cyclone Hayley was located at latitude 15.8°S and longitude 120.3°E which put the center about 210 miles (340 km) northwest of Broome, Australia.  Hayley was moving toward the southeast at 7 m.p.h. (11 km/h).  The maximum sustained wind speed was 85 m.p.h. (135 km/h) and there were wind gusts to 105 m.p.h. (165 km/h).  The minimum surface pressure was 976 mb.

The Australian Bureau of Meteorology issued a Warning for the portion of the coast from north of Broome to Cockatoo Island.  The Warning included the Dampier Peninsula and Derby.

The Australia Bureau of Meteorology issued a Watch for the region from east of Derby to Kuri Bay.

Tropical Cyclone Hayley rapidly intensified to the equivalent of a hurricane/typhoon early on Monday.  The inner end of a rainband wrapped around the center of Hayley’s circulation.  A small eye with a diameter of 10 miles (16 km) formed at the center of Tropical Cyclone Hayley.  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 Hayley’s circulation.  Storms near the core generated upper level divergence that pumped mass away from the tropical cyclone.  The removal of mass caused the surface pressure to decrease.

The circulation around Tropical Cyclone Hayley was very small.  Winds to hurricane/typhoon force extended out 20 miles (30 km) from the center of Hayley’s circulation.  Winds to tropical storm force extended out 65 miles (105 km) from the center of Tropical Cyclone Hayley.

The Hurricane Intensity Index (HII) for Tropical Cyclone Hayley was 12.7.  The Hurricane Size Index (HSI) was 7.1 and the Hurricane Wind Intensity Size Index (HWISI) was 19.8.

Tropical Cyclone Hayley will move through an environment favorable for intensification during the next 12 hours.  Hayley will move over water where the Sea Surface Temperatures are near 30°C.  It will move under the middle of a small upper level ridge that is northwest of Australia.  The upper level winds are weak near the middle of the ridge and there will be little vertical wind shear.  Tropical Cyclone Hayley is likely to continue to  intensify during the next 12 hours. Hayley could intensify rapidly because its circulation is so small.  Tropical Cyclone Hayley will move under the northeastern part of an upper level trough that is near the west coast of Australia in about 12 hours.  The upper level trough will produce northwesterly winds that will blow toward the top of Hayley’s circulation.  Those winds will cause the vertical wind shear to increase.  Tropical Cyclone Hayley will start to weaken when the vertical wind shear increases.

The upper level trough will steer Tropical Cyclone Hayley toward the east-southeast during the next 24 hours.  On its anticipated track, Tropical Cyclone Hayley will make landfall in the northern part of the Dampier Peninsula between Beagle Bay and Cape Leveque in 24 hours.

Tropical Cyclone Hayley is likely to be the equivalent of a hurricane/typhoon at the time of landfall.  Hayley will bring strong winds and heavy rain to the Dampier Peninsula and parts of Western Australia.  Heavy rain could cause flash floods in some locations.  Tropical Cyclone Hayley could also cause a storm surge of up to 10 feet (3 meters) along portions of the coast near where the center makes landfall.

Elsewhere over the South Indian Ocean, Tropical Cyclone Grant intensified to the equivalent of a Category 4 hurricane on the Saffir-Simpson Scale southeast of Diego Garcia.  At 10:00 a.m. EST on Monday the center of Tropical Cyclone Grant was located at latitude 13.8°S and longitude 80.0°E which put the center about 710 miles (1145 km) southeast of Diego Garcia.  Grant was moving toward the west at 12 m.p.h. (19 km/h).  The maximum sustained wind speed was 140 m.p.h. (225 km/h) and there were wind gusts to 165 m.p.h. (265 km/h).  The minimum surface pressure was 944 mb.

The Hurricane Intensity Index for Tropical Cyclone Grant was 28.3.  The Hurricane Size Index (HSI) was 10.4 and the Hurricane Wind Intensity Size Index (HWISI) was 38.7.  Tropical Cyclone Grant was similar in size and intensity to Hurricane Charley when Charley hit Southwest Florida in 2004.

Tropical Cyclone Hayley Forms Northwest of Australia

Tropical Cyclone Hayley formed over the South Indian Ocean northwest of Australia on Sunday. At 4:00 p.m. EST on Sunday the center of Tropical Cyclone Hayley was located at latitude 14.4°S and longitude 119.5°E which put the center about 320 miles (520 km) northwest of Broome, Australia.  Hayley was moving toward the south at 6 m.p.h. (10 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 993 mb.

A low pressure system over the South Indian Ocean strengthened on Sunday and the Australian Bureau of Meteorology designated the system as Tropical Cyclone Hayley.

The Australian Bureau of Meteorology issued a Watch for the portion of the coast of Western Australia from Broome to Cockatoo Island.  The Watch includes Derby.

A small low pressure system northwest of Australia strengthened to Tropical Cyclone Hayley.  Thunderstorms developed near the center of the low pressure system.  Thunderstorms also formed in bands in the western side of Hayley’s circulation.  Bands in the eastern side of Tropical Cyclone Hayley consisted primarily of showers and lower clouds.  Storms near the center of Hayley generated upper level divergence that pumped mass away to the west of the tropical cyclone.  The removal of mass caused the surface pressure to decrease.

The circulation around Tropical Cyclone Hayley was very small.  Winds to tropical storm force extended out 35 miles (55 km) from the center of Hayley’s circulation.

Tropical Cyclone Hayley will move through an environment favorable for intensification during the next 24 hours.  Hayley will move over water where the Sea Surface Temperatures are near 30°C.  It will move under the middle of a small upper level ridge that is northwest of Australia.  The upper level winds are weak near the middle of the ridge and there will be little vertical wind shear.  Tropical Cyclone Hayley will intensify during the next 24 hours.  Hayley could intensify rapidly because its circulation is so small.  Tropical Cyclone Hayley is likely to strengthen to the equivalent of a hurricane/typhoon.

Tropical Cyclone Hayley will move around the western end of a high pressure system that is over northern Australia.  The high pressure system will steer Hayley toward the southeast during the next 24 hours.  On its anticipated track, Tropical Cyclone Hayley will move toward the coast of Western Australia.  Hayley is likely to reach the coast east of Broome in less than 48 hours.

Tropical Cyclone Hayley will bring strong winds and locally heavy rain to the coast of Western Australia east of Broome.  Heavy rain could cause flash floods in some locations.

Elsewhere over the South Indian Ocean, Tropical Cyclone Gran continued to intensify.  At 1:00 p.m. EST on Sunday the center of Tropical Cyclone Grant was located at latitude 13.3°S and longitude 83.5°E which put the center about 900 miles (1450 km) east-southeast of Diego Garcia.  Grant was moving toward the west-southwest at 12 m.p.h. (19 km/h).  The maximum sustained wind speed was 90 m.p.h. (145 km/h) and there were wind gusts to 110 m.p.h. (175 km/h).  The minimum surface pressure was 978 mb.