File:Tropical Cyclone Joni 2009-03-12.jpg

English: Late on March 10, a strong tropical disturbance formed about 770km (475 miles) west of Tahiti. Later that day multispectrial imagery had shown a well defined low level circulation center with formative convective banding wrapping well in to the center. Because of this, the JTWC issued a Tropical Cyclone Formation Alert on the developing system. Late the next day, RSMC Nadi designated the disturbance as Tropical Depression 11F and started to issue gale warnings for the Southern Cook Islands. Early on March 12, the JTWC designated the disturbance as Tropical Cyclone 20P, whilst later that day RSMC Nadi upgraded the Depression to a Tropical Cyclone and named it Joni. The Category Two Tropical Cyclone moved south of 25S late on March 12th.