Central Ladprao is now closed and there is water on the surrounding roads. Police are there blocking traffic coming from Mo Chit – you can still turn right (as I did to our office) or else left – not sure how far Viphawadi-Rangsit is passable in that direction.
There is not a huge amount of water – a few cm on most of the roads but it seems to be deepening from the various pools that have formed. Photos on the Bangkok Post website show that the roads on the other side of the junction are up to perhaps 10 cm deep.
It will not be long, presumably, before the water starts to enter the mouth of Lad Prao road itself, if it has not already done so.