A flooding threat in Houston begins Thursday with areas near and south of the city bracing for heavy rainfall. When will the worst weather arrive?

Unlike rain that comes from a cold front, this round of storms formed along an upper-level area of low pressure. The result is that we won't feel any cooler after the rain ends. Highs are likely to reach the mid 80s both Saturday and Sunday with heat index values that could reach 90.

Rain should gradually taper off tonight into early Saturday. After the rain ends, though, we won't be feeling much cooler.