Karl

Tropical Depression Karl's strength has fluctuated. Karl formed on September 14th in the eastern Atlantic, strengthened to tropical storm intensity on September 16th and was downgraded to a tropical depression yesterday. The GPM core observatory satellite had an outstanding view of Karl when it passed above today at 1201 UTC (8:01 AM EDT). Data collected by GPM's Microwave Imager (GMI) and Dual-Frequency Precipitation Radar (DPR) instruments uncovered heavy rainfall inside storms within the tropical depression. DPR found that powerful convective storms near Karl's center of circulation were