Crews were called to the 200 block of Hogan Street along White Oak Bayou north of downtown for a water rescue just before 7 a.m. A gray sedan was found in the flood waters, but no driver was found.
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Firefighters also responded to a reported manhole rescue at Post Oak and Ambassador Wednesday morning, but that call was later cleared.
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Fallen tree branches also presented challenges for some commuters in north Houston. Crews removed debris from the area of Vivian Street and Willie Street Wednesday morning.
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A Flash Flood Watch for parts of southeast Texas has been extended until 1 p.m. Thursday. It could even get extended into Friday when additional downpours are expected.
This is a developing story and will be updated.