From Rusty Garrett:
Tropical Depression Harvey has taken most of the weather spotlight over the past few days and will continue to be a primary driver in Central Texas' weather this weekend.
Rain chances remain near 50% during the overnight hours as a weak front begins to stall over our area. This stalled front will continue to be the focus point for rain Thursday into Friday. Rain odds remain near 50% Thursday afternoon with pockets of heavy downpours expected throughout the day. With rain in the forecast, highs Thursday may only reach the upper 80s and lower 90s.
Tropical Depression Harvey will likely strengthen into a tropical storm late Wednesday. The system will approach South Texas between Brownsville and Victoria Friday as a strong tropical storm or a weak hurricane. As Harvey moves ashore Friday, the stalled frontal boundary across our area and weak atmospheric steering currents will force Harvey to slow down and meander over the state.
Harvey's impact to Central Texas will come mostly in the form of rain late Friday, Saturday, and through parts of Sunday. Harvey is expected to be a lopsided system and most of the heavy rain will likely be near and east of the center of circulation. Since Harvey will track near and east of our area, the heaviest rain this weekend will be focused near and east of I-35 where 2"-5" of rain can be expected with locally higher amounts. Wind impacts from Harvey may not be very high, however winds may gust to near 30 MPH at times with some of Harvey's rain bands.
In addition to a threat for flooding, isolated tropical funnels may spin up within Harvey's outer rain bands Friday and Saturday as the system moves ashore. Tropical cyclone driven tornadoes are usually very fast moving and they are usually not particularly strong, however we will be closely monitoring the tornado potential as well as the flooding potential for Central Texas over the coming days.