More than 100,000 homes and businesses in the Houston area lost electricity early Saturday morning as the region was struck by strong overnight thunderstorms. Another wave of rainfall was in the forecast for later Saturday, starting in the afternoon, along with wind gusts of up to 20 mph, according to the National Weather Service.

Houston and the rest of Southeast Texas are about to receive their biggest dose of rain in more than a month this weekend, according to the National Weather Service. Here are five big questions and what to keep in mind before the storms roll in and the puddles start to grow.

ANDERSON, Texas - The National Weather Service (NWS) has confirmed that a tornado touched down in Grimes County overnight. The NWS reported that an EF-0 touched down near Anderson, Texas, at about 2:30 a.m. Saturday, during the first round of severe storms for southeast Texas.

High winds, heavy rain, and lightning strikes have left more than one hundred thousand without power in the greater Houston area early Saturday morning.

Storms will linger in San Antonio through Saturday morning, but another round of storms could develop across Central and East Texas later in the day.

The National Weather Service has issued a flood watch for much of the Houston area as heavy storms are set to begin to move into the area overnight until 5 a.m. Sunday morning.

Heavy rainfall returns to other parts of Texas Friday, and a risk of flooding spreads toward Houston. Here's the timeline of what to expect.