Keywords: Tropical Cyclone Ilsa 2009-03-19 0630Z.jpg On 12 March TCWC Darwin identified that a weak tropical low had formed in the Arafura Sea On 17 March TCWC Perth began issuing shipping warnings for the developing tropical low The low developed into Tropical Cyclone Ilsa late on 17 March Ilsa became a Category 3 Severe Tropical Cyclone on the evening of 18 March and continued to intensify despite predictions by the JTWC that Ilsa would weaken Ilsa quickly strengthened the next morning to a Category 4 cyclone despite predictions that the cyclone would weaken before reaching that intensity http //199 9 2 143/tcdat/tc09/SHEM/22S ILSA/vis/geo/1km/20090319 0630 gms6 x vis1km 22SILSA 80kts-963mb-160S-1076E 100pc jpg 2009-03-19 Navy Research Laboratory and NASA Public domain PD-USGov-Military-Navy Cyclone Ilsa 2009 |