NASA's TRMM satellite passed over System 98S and saw the hallmark "hot towers" that indicated the storm would soon likely intensify into Tropical Storm Narelle.
NASA's TRMM satellite passed over System 98S on Jan. 7 at 4:01 a.m. EST/US hours before it intensified into Tropical Storm Narelle. TRMM saw two bands of strong thunderstorms west and northwest of the center where heavy rainfall (red) was occurring.
Credit: NASA/SSAI, Hal Pierce
NASA's Tropical Rainfall Measuring Mission (TRMM) satellite passed over System 98S on Jan. 7 at 0901 UTC (4:01 a.m. EST/U.S.) hours before it intensified into Tropical Storm Narelle.
TRMM's Precipitation Radar instrument captured estimates of rainfall occurring in the storm. TRMM noticed two bands of strong thunderstorms west and northwest of the center of circulation where rainfall was occurring at more than 2 inches/50 mm per hour. Some of those thunderstorms were "hot towers," or large towering thunderstorms.
A "hot tower" is a tall cumulonimbus cloud that reaches at least to the top of the troposphere, the lowest layer of the atmosphere. It extends approximately nine miles (14.5 km) high in the tropics. The hot towers in System 98S were over 9.3 miles (15 km) high. These towers are called "hot" because they rise to such altitude due to the large amount of latent heat. Water vapor releases this latent heat as it condenses into liquid. NASA research shows that a tropical cyclone with a hot tower in its eyewall was twice as likely to intensify within six or more hours, than a cyclone that lacked a hot tower. System 98S became Tropical Storm Narelle on Jan. 7 at 1800 UTC (1 p.m. EST/U.S.).
On Jan. 8, infrared satellite imagery showed that the low-level circulation center was consolidating (organizing). Just as the TRMM satellite showed improved convective (rising air that forms the thunderstorms that make up the tropical cyclone) banding in the western and northern quadrants of the storm on Jan. 7, infrared satellite data on Jan. 8 showed improved deep convective banding over the southeast quadrant of the system.
On Jan. 8 at 1500 UTC (10 a.m. EST/U.S.), Tropical cyclone Narelle had maximum sustained winds near 45 knots (51.7 mph/83.3 kph). The center of Narelle was located near 12.8 south latitude and 117.4 east longitude, about 605 miles north-northeast of Learmonth, Australia. Narelle was moving to the southwest at 9 knots (10.3 mph/16.6 kph).
Forecasters at the Joint Typhoon Warning Center (JTWC) take Narelle on a south-southwestward journey as a result of moving around the northwestern edge of a low-to-mid-level subtropical ridge (elongated area) of high pressure, located to the east and southeast of the system. That's because high pressure systems in the southern hemisphere rotate counter-clockwise.
JTWC forecasters expect that Narelle will continue to intensify and may reach wind speeds of 130 knots in three days as it nears Learmonth, Western Australia. The current forecast track, however, keeps the center at sea, but the eastern half of the storm is expected to impact the far western part of West Australia, including Learmonth. If the cyclone gets that strong, that would mean very rough seas and some coastal erosion, possible heavy rainfall and gusty winds for that area. Currently, there are no warnings in effect for Western Australia, but residents should monitor their local forecasts.
Rob Gutro | EurekAlert!
Only above-water microbes play a role in cave development
03.09.2015 | Penn State
NASA sees shapeless Tropical Depression 14E
03.09.2015 | NASA/Goddard Space Flight Center
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE have developed a highly compact and efficient inverter for use in uninterruptible power...
China's Loess Plateau was formed by wind alternately depositing dust or removing dust over the last 2.6 million years, according to a new report from University of Arizona geoscientists. The study is the first to explain how the steep-fronted plateau formed.
China's Loess Plateau was formed by wind alternately depositing dust or removing dust over the last 2.6 million years, according to a new report from...
The leaves of the lotus flower, and other natural surfaces that repel water and dirt, have been the model for many types of engineered liquid-repelling surfaces. As slippery as these surfaces are, however, tiny water droplets still stick to them. Now, Penn State researchers have developed nano/micro-textured, highly slippery surfaces able to outperform these naturally inspired coatings, particularly when the water is a vapor or tiny droplets.
Enhancing the mobility of liquid droplets on rough surfaces could improve condensation heat transfer for power-plant heat exchangers, create more efficient...
Longer, more severe, and hotter droughts and a myriad of other threats, including diseases and more extensive and severe wildfires, are threatening to transform some of the world's temperate forests, a new study published in Science has found. Without informed management, some forests could convert to shrublands or grasslands within the coming decades.
"While we have been trying to manage for resilience of 20th century conditions, we realize now that we must prepare for transformations and attempt to ease...
A University of Oklahoma astrophysicist and his Chinese collaborator have found two supermassive black holes in Markarian 231, the nearest quasar to Earth, using observations from NASA's Hubble Space Telescope.
The discovery of two supermassive black holes--one larger one and a second, smaller one--are evidence of a binary black hole and suggests that supermassive...
03.09.2015 | Event News
20.08.2015 | Event News
20.08.2015 | Event News
03.09.2015 | Process Engineering
03.09.2015 | Materials Sciences
03.09.2015 | Materials Sciences