(Press-News.org) Cyclone 19P in the Southern Pacific Ocean was renamed Sandra today, March 8, as NASA's Aqua satellite captured infrared data on the storm that indicated it would continue to strengthen. Residents of New Caledonia should prepare for impacts from Sandra early next week.
The Atmospheric Infrared Sounder (AIRS) instrument that flies aboard NASA's Aqua satellite captured an infrared image of Cyclone Sandra's cloud top temperatures on March 8 at 1717 UTC (12:17 p.m. EST). Strong thunderstorms around Sandra's center and in a band east of the center appeared as cold as -63 Fahrenheit (-52 Celsius), and are indicative of heavy rainfall.
As cloud tops grow taller in the troposphere, their temperatures grow colder (because temperatures drop with altitude in the troposphere). High cloud tops indicate a strong uplift of air that helps build the thunderstorms that make up a tropical cyclone. When uplift is strong, cloud tops sometimes punch through the top of the troposphere into the tropopause and even into the stratosphere.
Satellite imagery also showed central convection deepened (strengthened) over the storm's center since the previous day, indicating that Sandra is in a mode of strengthening.
Data from the Special Sensor Microwave Imager/Sounder (SSMIS) satellite instrument indicated an eye feature developing in Sandra early on March 8. Data from the SSMI is collected under the Defense Meteorological Satellite Program, which is a Department of Defense program responsible for designing, building, launching, and operating polar-orbiting environmental satellites.
On March 8 at 1200 UTC (7 a.m. EST/U.S.), Sandra's center was near 14.9 degrees south latitude and 157.7 degrees east longitude. The center of Cyclone Sandra was 645 nautical miles (742.3 miles/1,195 km) northwest of Noumea, New Caledonia. Sandra is moving to the east at 6 knots (7 mph/11.1 kph) and Sandra's maximum sustained winds had increased to near 60 knots (69 mph/111.1 kph).
Forecasters at the Joint Typhoon Warning Center noted on their update on March 8 that all environmental factors indicate that Sandra will continue to intensify over the next three days before weakening. Sandra is expected to pass west of New Caledonia on March 12, and bring heavy rain, possible flooding, strong winds and rough surf.
INFORMATION:
NASA satellite sees Sandra strengthening at sea
2013-03-09
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