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 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 | Source: EurekAlert!
Further information: www.nasa.gov
More articles from Earth Sciences:
Satellites See Storm System that Created Moore, Okla., Tornado
22.05.2013 | NASA's Goddard Space Flight Center
Amazon River Exhales Virtually All Carbon Taken Up by Rain Forest
22.05.2013 | University of Washington
A fried breakfast food popular in Spain provided the inspiration for the development of doughnut-shaped droplets that may provide scientists with a new approach for studying fundamental issues in physics, mathematics and materials.
The doughnut-shaped droplets, a shape known as toroidal, are formed from two dissimilar liquids using a simple rotating stage and an injection needle. About a millimeter in overall size, the droplets are produced individually, their shapes maintained by a surrounding springy material made of polymers.
Droplets in this toroidal shape made ...
Frauhofer FEP will present a novel roll-to-roll manufacturing process for high-barriers and functional films for flexible displays at the SID DisplayWeek 2013 in Vancouver – the International showcase for the Display Industry.
Displays that are flexible and paper thin at the same time?! What might still seem like science fiction will be a major topic at the SID Display Week 2013 that currently takes place in Vancouver in Canada.
High manufacturing cost and a short lifetime are still a major obstacle on ...
University of Würzburg physicists have succeeded in creating a new type of laser.
Its operation principle is completely different from conventional devices, which opens up the possibility of a significantly reduced energy input requirement. The researchers report their work in the current issue of Nature.
It also emits light the waves of which are in phase with one another: the polariton laser, developed ...
Innsbruck physicists led by Rainer Blatt and Peter Zoller experimentally gained a deep insight into the nature of quantum mechanical phase transitions.
They are the first scientists that simulated the competition between two rival dynamical processes at a novel type of transition between two quantum mechanical orders. They have published the results of their work in the journal Nature Physics.
“When water boils, its molecules are released as vapor. We call this ...
Researchers have shown that, by using global positioning systems (GPS) to measure ground deformation caused by a large underwater earthquake, they can provide accurate warning of the resulting tsunami in just a few minutes after the earthquake onset.
For the devastating Japan 2011 event, the team reveals that the analysis of the GPS data and issue of a detailed tsunami alert would have taken no more than three minutes. The results are published on 17 May in Natural Hazards and Earth System Sciences, an open access journal of ...
22.05.2013 | Life Sciences
22.05.2013 | Ecology, The Environment and Conservation
22.05.2013 | Earth Sciences
17.05.2013 | Event News
15.05.2013 | Event News
08.05.2013 | Event News