Observation site Map Geographical distributions Seasonal March Large scale fields of OLR, 850hPa U-wind , Precipitable water, and Precipitation. OLR time-latitude cross section. 850hPa U-wind time-latitude cross section. Water vapor fluxes and precipitable water five sites point values of Precipitable water and Precipitation. Dirunal variation over Indochina penisula Precipitable water Premonsoon period , 16th April - 5th May of 1998 Early monsoon period , 16th May - 14th June of 1998 Late monsoon period , 16th May - 14th June of 1998 OLR Premonsoon period , 16th April - 5th May of 1998 Early monsoon period , 16th May - 14th June of 1998 Late monsoon period , 16th May - 14th June of 1998 water vapor divergence Premonsoon period , 16th April - 5th May of 1998 Early monsoon period , 16th May - 14th June of 1998 Late monsoon period , 16th May - 14th June of 1998 five sites in the above map Precipitable water, precipitation, specific humidity, wind vector Chiang Mai : Premonsoon, Early monsoon, Late monsoon Nong Khai : Early monsoon, Late monsoon Bangkok : Premonsoon, Early monsoon, Late monsoon Ubon Ratchatani : Premonsoon, Early monsoon, Phuket : Premonsoon Convection index Chiang Mai and Bangkok Ic280 = max(280-Tbb,0)