From Sean Bellafiore:
While Thursday brought relatively dry weather to Central Texas, rain chances are going to surge back to near 100% Friday as widespread and locally heavy rain is back in the forecast. In anticipation of the rain, a Flash Flood Watch has been issued for nearly all of Central Texas until 10 PM Friday night. The only counties not included in the Flash Flood Watch are Freestone, Leon, and Roberston County. During the day on Friday, we're expecting another 1"-3" across Central Texas, mainly west of I-35. Instability in the atmosphere may increase a bit during the day Friday, so rainfall amounts may be locally higher within any embedded thunderstorms.
Overnight tonight, temperatures will slowly drop into the middle 50s with a 40% chance of scattered light rain. Highs on Friday should only climb to near 60° since rain will continue to move through during the day. The bulk of Friday's rain is set to arrive during the afternoon and evening, but scattered rain should gradually become more widespread during the morning. Especially after lunch time, rain may not end for a few hours in some spots since rain bands may train over the same areas. Most of the rain is expected to be light to moderate, but isolated heavy rain cells will move through. With more rain on the way, street flooding in addition to flooding of already swollen lakes and rivers is likely. Do NOT drive through ANY flooded roads or low water crossings. Your vehicle can be easily swept away by the rising floodwaters.
Rain will slowly diminish in coverage overnight Friday into Saturday, but rain is still expected to be widespread during the early and middle part of the evening. As a frontal boundary begins to slowly move in from the north Saturday morning, rain will gradually come to a close. Rain chances Saturday are near 50% and most of Central Texas will likely be dry by 2 PM. We may even see a bit of sunshine filtered through high clouds at the end of the day. Highs Saturday should be able to reach the middle and upper 60s. Expect partly cloudy skies Sunday with highs in the middle 60s. Unfortunately, more rain is in the forecast next week. The highest chances of rain are, as of now, Tuesday and especially Wednesday. Next week, another 1"-2" of rain may fall.