At 3:14 p.m., more than 20,355 Houston-area customers were without power, according to CenterPoint Energy's outage tracker.
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That number went down to about 16,000 but skyrocketed again to 23,713 by 4 p.m. and continued to climb for about 20 minutes, reaching 34,932.
Data shows the majority of the outages were in northwest Harris and Montgomery Counties.
At 4:45 p.m., more than 51,000 customers were experiencing outages.
According to the electricity provider, more than 13,000 customers had power restored within the past 24 hours. And as of 8:45 p.m., 5,700 customers were still experiencing outages.
By Tuesday morning, 6,493 customers were still without power, according to the tracker.
Monday was an ABC13 Weather Alert Day with chances for strong to severe thunderstorms, including the risk of tornadoes. A Tornado Watch was issued for southeast Texas.
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FULL FORECAST: See full forecast details from ABC13 meteorologists