sentences:  On January 12 the Perth Meteorlogical Center issued a TCF and the JTWC followed suit and they named the Low 10S.A tropical low located about 930 km north of Learmonth, Western Australia began to develop a deeper convection on 23 January, despite being beneath the subtropical ridge.The low became Tropical Cyclone Tim the next day, when it was 700 km southeast of Christmas Island.