logo ban ban logo

Průměrný učitel vypráví. Dobrý učitel vysvětluje. Výborný učitel ukazuje. Nejlepší učitel inspiruje.

Charles Farrar Browne

Polní laboratoř

NASA Sees Tropical Cyclone Oswald Weaken Over Queensland's Cape York Peninsula

NASA's Aqua satellite documented the formation of Tropical Storm Oswald in the Gulf of Carpentaria on Jan. 21 and the landfall on Jan. 22 in the southwestern Cape York Peninsula of Queenstown, Australia. Oswald has since become remnant low pressure area over land.Tropical Storm Oswald was hugging the southwestern coast of the Cape York Peninsula, Queensland, Australia when NASA's Aqua satellite first flew overhead on Jan. 21 at 0430 UTC (Jan. 20 at 11:30 p.m. EST). The Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard NASA's Aqua satellite captured a visible image of the storm that showed tight bands of thunderstorms. Those bands weakened the next day when MODIS captured a second visible image of the storm. At that time, Oswald's eastern quadrant was over land. On Jan. 21 at 0600 UTC (1 a.m. EST), Oswald had maximum sustained winds near 35 knots (40 mph/64.8 kph). Oswald was centered near 15.8 south and 141.2 east, about 90 nautical miles (103.6 miles /166.7 km) east-northeast of Mornington Island, Australia. NASA MODIS imagery on Jan. 22 showed Oswald's center over the southwestern coast of the peninsula while monsoonal flow was bringing thunderstorms and heavy rainfall to the eastern side of the peninsula. Oswald's maximum sustained winds had dropped to 25 knots (28.7 mph/46.3 kph) on Jan. 22. NASA also captured an infrared image of Tropical Storm Oswald on Jan. 22 at 0329 UTC with the Atmospheric Infrared Sounder (AIRS) instrument that also flies aboard NASA's Aqua satellite. AIRS data revealed cold cloud tops and strong storms associated with Oswald and a nearby monsoonal trough (elongated area of low pressure) stretched from Cairns north to Cooktown, and over Cape Melville and Lakefield National Parks on the eastern Cape York Peninsula. At 0600 UTC (1 a.m. EST/U.S.) on Jan. 22, Oswald was downgraded to a remnant low pressure area. The center of circulation was located near 5.0 south latitude and 142.3 east longitude, about 185 nautical miles (213 miles/342.6 km) east-northeast of Mornington Island, Australia, and over the Cape York Peninsula. Infrared satellite data at that time showed the strongest storms were located in the northwestern quadrant. An image from NASA's Tropical Rainfall Measuring Mission (TRMM) satellite on Jan. 22 showed that the low-level center was now stretched across the Cape York Peninsula.The Australian Bureau of Meteorology (ABM) noted at 10 p.m. Cairns local time (7 a.m. EST/U.S.), that ex-tropical Cyclone Oswald was located over eastern Cape York Peninsula approximately 70 km (43.5 miles) east of Cape Flattery. Oswald was moving southeast at 20 kph (12.4 mph). ABM noted that the monsoon trough (elongated area of low pressure) extended from the ex-tropical cyclone to the east coast near Cairns, which contain the storms that NASA's AIRS instrument saw.ABM forecasts damaging winds, with gusts to 90 kph (56 mph) with showers and thunderstorms across Cape York Peninsula north of Cooktown. Locations which may be affected include Aurukun, Weipa, Torres Strait Islands, Lockhart River, Coen and Cooktown. Heavy rainfall is likely throughout the Peninsula district, coastal parts of the North Tropical Coast and Tablelands district, and coastal parts of the Herbert and Lower Burdekin district north of about Ayr. The heavy rainfall may also lead to flash flooding. For more information: http://www.bom.gov.au/cyclone/.Forecasters expect Oswald to linger over the Cape York Peninsula and the Joint Typhoon Warning Center expects Oswald's remnants to continue tracking over land to the southeast.

NASA Sees Tropical Storm Garry Moving Past Samoa

Infrared satellite imagery from NASA showed that Tropical Storm Garry's power lies around its center as it was passing north of Samoa on Jan. 22. The Atmospheric Infrared Sounder (AIRS) instrument that flies aboard NASA's Aqua satellite captured an infrared image of Tropical Storm Garry on Jan. 22 at 1241 UTC (7:41 a.m. EST). The coldest cloud tops and strongest storms appeared south of the tight center circulation. The coldest cloud top temperatures were near -63 Fahrenheit (-52 Celsius). There is also strong convection (rising air that forms thunderstorms) over the southeast quadrant and broken bands of thunderstorms north of the center.Garry is the tenth tropical cyclone in the Southern Pacific Ocean season. In Fiji, Garry has is known as Tropical Cyclone 09F. Garry was moving south-southeast on Jan. 22 and continued to pass north of Samoa while warnings remained in effect. A gale warning was in effect on Jan. 22 for Tutuila, Aunuu and Swains Island and a storm warning was effect for Manua. On Jan. 22 at 0900 UTC (4 a.m. EST/U.S.), Garry had maximum sustained winds near 45 knots (51.7 mph/83.3 kph). Tropical –storm-force winds extended 50 nautical miles (57.5 miles/92.6 km) out from the center. Garry was centered near 13.2 south latitude and 169.8 west longitude, about 85 nautical miles (97.8 miles/157.4 km) northeast of Pago Pago, American Samoa. Garry is moving to the south-southeast at 6 knots (7 mph/11 kph). Garry is forecast move slowly to the east and away from Samoa over the next several days, and intensify into a cyclone.

Tropical Cyclone Peta (South Indian Ocean)

Infrared data from NASA's Aqua satellite has shown that soon after a low pressure system in northwestern West Australia became Tropical Storm Peta, it made landfall and started to fall apart. Early on Jan. 22, the Joint Typhoon Warning Center (JTWC) gave System 93S a high chance for development into a tropical depression. At that time, System 93S was located near 19.2S and 120.7E, about 415 nautical miles (477.6 miles/768.6 km) east-northeast of Learmonth, Australia. Satellite imagery showed that the center is consolidating, and bands of thunderstorms had developed, so the Australian Bureau of Meteorology had posted a watch for the coast of Western Australia, from De Grey to Onslow, including Port Hedland and Karratha. By 2100 UTC (4 p.m. EST/U.S.) the low became Tropical Depression 12S in the Southern Indian Ocean. NASA's Tropical Rainfall Measuring Mission (TRMM) satellite saw tropical storm Peta forming off the coast of Port Hedland, Australia on January 22, 2013 at 1631 UTC (11:31 a.m. EST). Precipitation data from TRMM's Microwave Imager and Precipitation Radar (PR) instruments were coupled with enhanced infrared imagery from TRMM's Visible and InfraRed Scanner (VIRS) at NASA's Goddard Space Flight Center in Greenbelt, Md. to create a full view of Peta's rainfall rates. TRMM revealed that rain was falling at a rate of up to 94 mm (~3.7 inches) per hour near the center of the developing tropical cyclone. A 3-D image constructed from TRMM's PR data showed that some intense storms had tops reaching above 16 km (~9.9 miles).On Jan. 23 at 0900 UTC, the depression gained strength and became Tropical Storm Peta. Peta moved over land in the Pilbara Coast near Karratha and was still over land by 1500 UTC (10 a.m. EST/U.S.). At that time, Peta was centered near 21.6 south and 117.3 east, about 180 nautical miles (207 miles/333 km) east of Learmonth, Australia. Peta's maximum sustained winds were near 35 knots (40 mph/64.8 kph) and it was moving to the south-southwest at 6 knots (7 mph/11.1 kph). JTWC noted that radar imagery on Jan. 23 from Dampier, Australia showed the low-level circulation center was becoming increasingly difficult to pinpoint as Peta continued moving over land. NASA's Aqua satellite passed over Western Australia on Jan. 23 at 0547 UTC (12:47 a.m. EST/U.S.) and the Atmospheric Infrared Sounder (AIRS) instrument gathered temperature data using infrared light. The AIRS data revealed that cloud top temperatures have warmed which indicates the strength in the uplift of air (that helps form thunderstorms) has weakened. The AIRS data also showed that the overall structure of the storm was becoming irregular. By 1000 UTC (5 a.m. EST/U.S./6 p.m. WST local time, Australia) the Australian Bureau of Meteorology (ABM) noted that Peta had become an ex-tropical cyclone. The center of circulation was inland and just southeast of Karratha. ABM canceled the Cyclone Warning for coastal areas between Port Hedland and Dampier, including Karratha. Although the wind danger has passed, residents along the Pilbara coast may still experience heavy rainfall. Forecasters at the Joint Typhoon Warning Center expect Peta to re-emerge over the open waters of the Indian Ocean, but do not expect the storm to strengthen. The movement over land and an increase in vertical wind shear has weakened the storm and will cause the storm to dissipate over the ocean.



Zemědělská 1/1665
613 00 Brno
Budova D		Tel.: +420 545 133 350
Fax.: +420 545 212 044