Extreme Weather News
The GPM core observatory satellite again passed over the center of tropical cyclone IRIS on April 6, 2018 at 0027 UTC (10:27 AM AEST). The location of IRIS' low level center of circulation is shown here with a red tropical storm symbol. Data collected by GPM's Microwave Imager (GMI) revealed that heavy convective rainfall was sheared to the southeast of IRIS' surface center of circulation. Those GMI data showed that precipitation in that area of strong convection was falling at a rate greater than 59 mm (2.3 inches) per hour while data received by GPM's Dual Frequency Precipitation Radar (DPR) revealed that very little rain was falling near IRIS' low level center of circulation. The location viewed by GPM's radar is shown in lighter shades.
The Joint Typhoon Warning Center (JTWC) predicts that tropical cyclone IRIS will weaken gradually over the next few days while circling back to the north. IRIS' winds are expected to decrease to about 30 kts (34.5 mph) in the next couple days while moving over the open waters of the Coral Sea. There is a chance that lowering vertical wind shear and warm ocean waters will allow IRIS to rebound to tropical cyclone intensity.
- Images and caption by Hal Pierce (SSAI/NASA GSFC)