Flood estimates from GFMS using IMERG input show evolution of flooding over the last few days, with expansion from Houston area to southeastern Texas and Louisiana. 

Satellite-based rainfall (GPM IMERG) from now Tropical Storm Harvey over the last three days compares fairly well with raingauges, except for peak values.  IMERG has peaks of about 500 mm (~ 20”) around Houston, whereas gauges indicate over 35”.  Contour at 150 mm, however, agrees reasonably well.