Air travel, traffic and electricity service could be affected by more heavy rains that are expected to roll through Houston overnight.

After an afternoon break from the storms, a second round of activity is likely to move through the region late tonight. A few storms could be severe, capable of hail and damaging wind gusts.

Houstonians can expect scattered thunderstorms to develop and move quickly across Southeast Texas into the evening. During this time, storms will be sporadic and not everyone will see rain, leaving the Houston metro area with about a 40% chance of rainfall.

The most significant rainfall, however, is expected to hit after 10 p.m.

A large cluster of thunderstorms will move in from the northwest, resulting in more widespread storms in and around Houston. Overall rain chances during this time are 70%-80%. Most storms are expected to make their way east out of Houston after 2 a.m.

The Houston metro area continues to be under a Level 2 of 5 risk of severe storms, as set forth by the National Weather Service’s Storm Prediction Center. That means tonight’s storms may be capable of hail and damaging wind gusts, up to 70 mph.

A flood watch is also in effect for the region until 5 a.m. Sunday morning. Additional rainfall of 1-2 inches is likely in Houston. However, isolated higher totals of 4 inches or more is possible for a few spots.

Flight Delays

Flight delays and ground stops are possible at the city’s two major airports.

As a result, warnings for possible ground stops at Bush Intercontinental Airport and Hobby Airport until 9 p.m. have been put out by the Federal Aviation Administration.

According to the Houston Airport System, severe weather such as rainfall could bring airport operations to a halt, delaying inbound and outbound flights.

READ MORE: Flood and damaging wind threat expected in Houston on Saturday. Here’s what to know.

Severe thunderstorms hit Southeast Texas on Saturday morning, and downpours are expected to continue into the evening.

The potential weather-related delays come amid an ongoing government shutdown which has disrupted airports across the country and air traffic controllers continue to work without pay.

Power Outages

As of 10:30 a.m., more than 44,000 CenterPoint Energy customers still did not have power

From 3 a.m. to 6 a.m., about 169,000 customers in the Greater Houston area lost power due to severe weather, according to CenterPoint Energy.

The company had 1,300 frontline workers and contractors working Saturday morning to restore power.

Nathan Brownell, CenterPoint Energy’s vice president of resiliency and capital delivery, said the “majority of our impact” was north of I-10 – such as in Greenspoint, Cypress and Kingwood – where wind gusts reached 40 to 50 mph.

He said more outages can be expected with the second wave of thunderstorms this evening.

Brownell added that the company has staffed all of its 12 service centers across the Houston area to respond to power outages, and is ready to to send additional crews to specific locations where severe weather may cause significant trouble.

“We’ve pre-positioned those resources in those areas,” Brownell said. “We’re not going to be unprepared. We will be ready restore our power quickly and safely.”

Anthony Franze contributed to this story.

This is a developing story. Check back for updates.

This article originally published at Houston storms will power up again tonight. Here’s when to expect the worst..