Tropical Storm Hanna upgrades to a hurricane, bringing heavy rain to Houston

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Heavy rains from Hurricane Hanna have hit the Houston area and a tornado watch could be issued later on Saturday as the storm moves through the lower Texas coast, according to the National Weather Service.

The tropical storm upgraded to a hurricane Saturday morning with 75 mph winds. Gusty winds and brief heavy rainfall are expected to continue in Houston throughout the day. The rain could bring flash flooding for the south and southwestern portions of the region, per the NWS.

This is a developing story.