Cyclone Dianne Currently Staying Away from Australia

When NASA's Aqua satellite flew over Tropical Cyclone Dianne on Feb. 18 at 06:47 UTC (2:47 p.m. Australia/Perth local time/1:47 a.m. EST) it provided information to forecasters that showed Dianne moving farther west than previously forecast. That movement is keeping the storm farther away from Western Australia and that's good news because Dianne strengthened.

The Atmospheric Infrared Sounder (AIRS) instrument on the Aqua satellite showed a larger area of strong thunderstorms around Dianne's center today, Feb. 18, compared to yesterday. The greatest area of deep convection (rapidly rising air that forms the thunderstorms that power the tropical cyclone) are over the northern semi-circle of the storm.

AIRS infrared data takes temperatures of cloud tops and sea surface temperatures and noticed the stark contrast between the two indicating that the thunderstorm cloud tops were very high, very cold (-52C/-63F) and very strong. Meanwhile, the sea surface temperatures were very warm (warmer than 80F/26.5C) and adding power to Dianne.

System 98S Southern Indian Ocean

NASA’s Aqua satellite is already seeing the potential in a tropical low pressure area to blossom into a tropical cyclone through its very cold cloud top temperatures.

A low pressure system known as System 98S is currently moving over the northern coast of Western Australia appears to have a good chance for developing into a tropical cyclone later this week once it slides into the warm waters of the Southern Indian Ocean.

On Monday, January 24, 2011 EST, the low was nearing Kuri Bay, located on the northern coast of Western Australia. It is forecast to continue moving southwest and skip over water along the northern coast as it heads toward Beagle Bay, Derby and Broome will be affected by the low’s outer rains and winds as it continues tracking southwest.

Tropical Storm Vania South Pacific Ocean

Tropical Storm Vania on January 12 at 1246 UTC (7:46 a.m. EST). TRMM noticed that some of the thunderstorms reached more than 9 miles (~15 kilometers) high, indicating strong uplift and a heavy rainmakers. TRMM also noticed that the heaviest rains were falling in the northeastern quadrant of the storm and indicate rainfall at about 2 inches per hour. Other quadrants of the storm were generating moderate rainfall rates between .78 to 1.57 inches per hour. TRMM is managed by NASA and the Japanese Space Agency, JAXA.

TRMM captured the rainfall rates of Tropical Storm Vania on January 12 at 1246 UTC. The yellow and green areas indicate moderate rainfall between .78 to 1.57 inches per hour. The heaviest rains were falling in the northeastern quadrant of the storm (Red) and indicate rainfall at about 2 inches per hour.

System 93P

System 93P, which is also designated in the Fiji Islands as “03F” for third tropical disturbance formed in the South Pacific Ocean. On Monday, January 10, 2011 at 0600 UTC (1 a.m. EST), it was located about 115 miles east-northeast of Port Vila, Vanuatu near 16.9 South and 170.0 East.

Vanuatu is an island nation located in the South Pacific Ocean about 1,090 miles (1,750 kilometers) east of northern Australia, and 301 miles (500 kilometers) northeast of New Caledonia and west of Fiji.

The infrared image provided an appearances of circular motion, but didn’t show a well-organized storm. Areas that are brighter white are areas of stronger convection

Tropical Storm Tasha

Cyclone Tasha recently made landfall just south of Cairns along the northeast coast of Queensland, Australia during the early morning hours on Christmas Day.

The storm, which had formed just off the coast, came ashore as a Category 1 cyclone (equivalent to a tropical storm on the U.S. Saffir-Simpson scale) with wind gusts of up to 105 kph (~65 mph) reported just offshore. The Tropical Rainfall Measuring Mission satellite (known as TRMM) was launched back in 1997 with the primary purpose of measuring rainfall in the Tropics.

With its unique combination of active radar and passive microwave sensors, TRMM has also served as a valuable platform for monitoring tropical cyclones. TRMM captured an image of Tasha at 15:32 UTC (5:32 am AEST) on the 24th of December 2010 just before it became a Category 1 cyclone. Tasha appears as an area of enhanced rainfall with moderate to localized areas of heavy rain embedded within a broader area of light to moderate rain draped along the coast of northeastern Australia.

Tasha has no eye and little evidence of banding, which indicates that it is not an intense system. In fact, Tasha's winds did little damage and the storm was quickly downgraded from a cyclone by the Australian Bureau of Meteorology's Tropical Cyclone Warning Centre; however, heavy rains from the storm and its remnants had a substantial impact on the region by exacerbating flood conditions already in place as a result of prior excessive rainfall across eastern Australia. The result was widespread flooding with many areas cut off.

Tropical Storm Tasha

Tropical Storm Tasha formed quickly in the South Pacific Ocean last weekend and made landfall on the coast of Queensland, Australia on Christmas day (local time). NASA's Terra satellite passed over Tasha after its center made landfall and captured a visible image of the storm revealing some powerful thunderstorms.

On Dec. 24, Tropical Storm Tasha formed quickly and headed for landfall near Cairns, Australia. At 1800 UTC (1 p.m. EST or 4 a.m. on Dec. 25 local time –Brisbane/Australia), Tasha was near 17.1S 146.3E, about 35 nautical miles east-southeast of Cairns with maximum sustained winds near 39 mph. At that time a NASA Tropical Rainfall Measuring Mission (TRMM) satellite image showed banding of thunderstorms and the storm was getting more organized.

Powerful Snowmaker Leaving New England

Snows are finally winding down in New England today, Dec. 27, as a powerful low pressure system brought blizzard conditions from northern New Jersey to Maine over Christmas weekend. The GOES-13 satellite captured an image of the low's center off the Massachusetts coast and saw the snowfall left behind.

The Geostationary Operational Environmental Satellite called GOES-13 captured the visible image. GOES satellites are operated by the National Oceanic and Atmospheric Administration, and NASA's GOES Project, located at NASA's Goddard Space Flight Center, Greenbelt, Md. creates some of the GOES satellite images and animations.

As of 1:30 p.m. EST, all blizzard warnings were canceled as the low has pulled much of its snow and rain away from land areas and into the North Atlantic Ocean. The winds behind the system are now causing more problems for residents along the U.S. East coast.