Nope just low level sea breeze heated up due to the rather extreme convection happening as a result of the strong daytime solar heating in recent days, converging in the evening.
Also from the Meteorological Doppler solid state Weather Radar (MDWR) and Multifunctional Transport Satellites (MTSAT) images that I'm looking at now, a massive Sumatra squall also moved in at night from Riau, Sumatra, Indonesia. Beginning crossing over the Strait of Malacca at approximately 2013-05-15 T 2300 hours and reaching Singapore at approximately 2013-05-16 T 0345 hours.