Wednesday Night through Saturday
A large trough of low pressure in the mid and upper atmosphere is forecast to set up across the southwestern U.S. Wednesday and remain nearly stationary through Saturday. A southwesterly wind flow developing along the eastern side of the trough is expected to pull warm air up and over the cooler air at the surface, resulting in widespread overrunning clouds and rain. In addition, forecasts call for several embedded waves of low pressure to track northeast across Texas out of Mexico, with each wave expected to enhance the development of rain. Just a slight chance for thunderstorms is forecast through the period and all thunderstorms should remain well below severe threshold.
The probability for rain will be around 60-70 percent beginning late Wednesday night, continuing through Saturday afternoon.
Based on how the overrunning pattern is forecast to setup, the highest totals of rain of rain are expected to occur mostly along and east of Interstate 35, with the lowest totals occurring across the Hill Country.
Rainfall forecasts through Saturday call for totals between 0.5 and 1 inch across the western half of the Hill Country, and between 1 and 1.5 inches across the eastern half. Across Central Texas, totals are forecast to be between 1 and 3 inches. Across the coastal plains, totals are forecast to be between 2 and 4 inches, with isolated totals to near 6 inches.
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High temperatures Thursday through Saturday are forecast to be in the mid-60s to low 70s.
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Low temperatures Friday morning through Sunday morning are forecast to be in the mid-50s to low 60s.
Sunday through Next Monday
Forecasts call for the overrunning pattern to diminish as western trough lifts to the northeast. Expect a partly cloudy sky Sunday with just a slight chance for rain. This will be followed by a mostly sunny sky and dry weather next Monday. High temperatures are forecast to be in the low 80s.
Find more at https://www.lcra.org/news/bob-rose-on-the-weather/.