39-nasaseestropA powerful tropical cyclone over the southwest Indian Ocean is threatening Madagascar with potentially life-threatening storm surge after undergoing a period of very rapid intensification over the weekend. According to a bulletin issued by the Regional Specialized Meteorological Centre (RSMC) at La Reunion at 1845 GMT (2:45 p.m. U.S. EDT) Sunday, Tropical Cyclone Hellen was packing 10-minute average winds as high as 145 miles per hour – the equivalent of about 150 miles per hour, or a Category 4 hurricane, using the U.S. standard 1-minute average wind. More