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Tonight — Thursday night into early Friday morning
One more flare-up of heavy storms is expected over the same saturated corridor west and northwest of San Antonio. An additional 2 to 4 inches is likely where storms train, with isolated totals up to 8 inches possible. The ground has no capacity left — any downpours will re-flood roads and creeks within minutes.
Friday morning — Flood Watch runs until 12 PM
The Flood Watch holds through midday for Bexar County, the Hill Country and the U.S. 90 corridor. River flooding lags the rain: the Guadalupe at Spring Branch is forecast to crest about a foot above moderate flood stage early Friday, threatening structures and roads near the water in Comal County, while the Medina River warning at Highway 281 continues into the afternoon. Expect a hazardous morning commute.
Friday afternoon — The pattern finally breaks
The stalled setup responsible for this week’s deluge loosens its grip Friday afternoon, opening a dry stretch for the area. Rivers stay dangerous even as the rain ends — flood waves on the Guadalupe and Cibolo will still be working downstream, and re-opened roads can close again wherever runoff converges.
Saturday — Drying out, rivers receding
The flash flood threat eases substantially, with only lingering showers possible, mainly well west of the area. Rivers recede slowly through the weekend, damage assessment begins in earnest across the hardest-hit counties, and lingering closures remain where floodwater damaged pavement and bridges.