Tropical Cyclone Olwyn Landfalls as NASA's Terra Satellite Flies Overhead
Shortly after Tropical Cyclone Olwyn made landfall near Cape Cuvier in Western Australia early on March 13, NASA's Terra satellite captured an image of the storm.
The Moderate Resolution Imaging Spectroradiometer instrument known simply as MODIS gathered visible data on the storm that was made into a picture at NASA's Goddard Space Flight Center in Greenbelt, Maryland. The MODIS image was taken at 02:55 UTC on March 13 (10:55 a.m. WST Australia local time/10:55 p.m. EDT, March 12). The image showed the center of Olwyn near Carnavon, which is located along the western coast of Western Australia. Just to the north of Carnavon and just inland from the coast is Lake Macleod. Bands of thunderstorms from the south swept over Shark Bay and wrapped into the center of Olwyn. Higher clouds associated with Olwyn's circulation extended all the way south to the capital city of Perth, about 900 km from Carnavon. Perth is located in Western Australia's southwestern corner.
The Australian Bureau of Meteorology (ABM) issued tropical cyclone warnings from Carnarvon to Jurien Bay, extending to the inland western Gascoyne, northern Central West and northwest Central Wheat Belt. In addition to the warnings, there were also red and yellow alerts in effect.
A Red Alert was in effect for residents in coastal communities from Cape Cuvier to Denham, including Useless Loop, Overlander Roadhouse, Billabong Roadhouse, Carnarvon and Wooramel.
A Yellow Alert was in effect for residents in coastal communities between Kalbarri to Jurien Bay townsite and inland to Mullewa (this includes coastal communities and the towns of Port Gregory, Horrocks, Nabawa, Dongara, City of Greater Geraldton including Greenough, Leeman, Jurien Bay, Mingenew, Green Head, Morawa, Three Springs, Carnamah, Coorow, Moora, Dandaragan, Eneabba, New Norcia, Calingiri and Perenjori. People need to take action and get ready to shelter from a cyclone.
For updated warnings and watches, visit: http://www.bom.gov.au/cyclone.
On March 13 at 9 a.m. EST/U.S. or 9 p.m. WST Australia local time, the center of Tropical Cyclone Olwyn is tracking very close to the coast and was about 43.5 miles (70 km) southeast of Denham, near 26.4 degrees South and 114.0 degrees East. Olwyn is moving to the south-southeast at 16 mph (26 kph). Olwyn was a tropical storm with maximum sustained winds near 62 mph (100 kph).
The ABM forecast calls for Olwyn to gradually weaken as it tracks south along the coast of Western Australia over the next day.
NASA's Goddard Space Flight Center
[image-51][image-80]Mar. 12, 2015 - NASA Sees Tropical Cyclone Olwyn Nearing Landfall in Australia
Tropical Cyclone Olwyn was close to making landfall in the northern region of Western Australia when NASA's Aqua satellite passed overhead. The Australian Bureau of Meteorology has posted several warnings.
Warnings in Western Australia on March 12 (and March 13 local time) include: A tropical cyclone warning from Roebourne to Geraldton, including Karratha, Barrow Island, Onslow, Exmouth, Coral Bay, Carnarvon, Denham, Kalbarri and adjacent inland parts of the western Pilbara, western Gascoyne and western Central West Districts. A tropical cyclone watch is in effect from Geraldton to Jurien Bay and extending inland to Paynes Find.
In addition to warnings and watches there are red, yellow and blue alerts posted. A red alert is in effect from Mardie to Onslow including Onslow (excluding Pannawonica). A yellow alert is up from Onslow to Overlander Roadhouse, including Exmouth, Coral Bay, Cape Cuvier, Carnarvon, Wooramel and Denham.
A blue alert is in effect for residents in coastal communities between Roebourne to Mardie, including Point Samson, Wickham, Roebourne, Dampier, Pannawonica and from Overlander Roadhouse to Kalbarri including Billabong Roadhouse.
The International Space Station's RapidScat instrument captured data on Olwyn's winds on March 11 from 06:40 to 8:13 UTC (2:40 a.m. to 4:13 a.m. EDT). RapidScat revealed sustained winds between 20-25 meters per second (44 mph/72 kph to 56 mph/90 kph) occurring north, east and south of the center.
The MODIS instrument aboard NASA's Aqua satellite captured a visible image of Tropical Cyclone Olwyn on March 12 at 06:30 UTC (2:30 a.m. EDT) as it neared the town of Exmouth. Exmouth is a town on the tip of the North West Cape of Western Australia. The MODIS image showed a thick band of thunderstorms wrapping from the north to the eastern quadrant and into the center. The Joint Typhoon Warning Center noted that satellite data shows ragged convection around the 15 nautical mile (17.2 miles/27.7 km)-wide eye.
On March 12, 2015 at 1500 UTC (11 a.m. EDT), Tropical cyclone Olwyn's maximum sustained winds were near 65 knots (75 mph/120 kph), making it a Category one hurricane on the Saffir-Simpson Wind Scale. It was centered near 21.9 south latitude and 114.0 east longitude, just 60 nautical miles (69 miles/111 km) north of Learmonth, Australia. It was moving to the south-southwest at 16 knots (18.4 mph/29.6 kph).
Olwyn is forecast to make landfall near Cape Cuvier in the early hours of Friday (local time) and then move in a southerly direction, over the western coastline of Western Australia and exiting the southwestern part of the territory on March 14 near Albany. For updated forecasts from ABM, visit: http://www.bom.gov.au/cyclone.
NASA's Goddard Space Flight Center
Mar. 11, 2015 - NASA Captures Birth of Tropical Cyclone Olwyn Headed for Northwestern Australia
NASA's Aqua satellite saw newly formed Tropical Cyclone Olwyn nearing northwestern Australia on March 11 when it passed overhead. Meanwhile, Tropical Cyclone Nathan was threatening northeastern Australia.
Data from the Moderate Resolution Imaging Spectroradiometer or MODIS instrument that flies aboard NASA's Aqua satellite is gathered and processed daily into images at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
On March 12 at 05:50 UTC (1:50 a.m. EDT) imagery generated from the Moderate Resolution Imaging Spectroradiometer or MODIS instrument that flies aboard NASA's Aqua satellite showed Tropical Cyclone Olwyn in the Southern Indian Ocean approaching the northern coast of Western Australia.
Olwyn has generated warnings in northern Western Australia. A tropical cyclone warning is in effect for coastal areas of Western Australia from Port Hedland to Ningaloo, including Karratha, Barrow Island, Onslow, Pannawonica, Nanutarra and Exmouth (not including Port Hedland). In addition, a tropical cyclone watch is in effect from Ningaloo to Kalbarri, and adjacent inland areas of the west Pilbara and west Gascoyne, including Gascoyne Junction and Murchison Roadhouse.
In addition to the warnings and watches, the Australian Bureau of Meteorology has posted a blue alert for residents in or near Whim Creek to Coral Bay extending inland to Pannawonica. This includes people in the locations of Whim Creek, Point Samson, Wickham, Roebourne, Karratha, Dampier, Onslow, Pannawonica and Exmouth.
Olwyn has formed north of Exmouth and is forecast to move south-southwest while intensifying. At 1500 UTC (11 a.m. EST), Olwyn was centered near 17.3 south latitude and 116.0 east longitude, about 233 nautical miles (268 miles/431.5 km) northwest of Port Hedland, Australia. Olwyn is moving to the south-southwest at 12 knots (13.8 mph/22.2 kph) and has maximum sustained winds near 55 knots (63.2 mph/102 kph).
Olwyn is forecast to make landfall near Cape Cuvier in the early hours of Friday (local time) and dissipate in the interior of Western Australia.
NASA's Goddard Space Flight Center