The Houston Independent School District announced Sunday that all its campuses will be closed as tropical storm Beryl bears down on the Texas coast and is expected to be a Category 1 hurricane when it makes landfall.

The school district sent out a message Sunday to students, staff and parents that it is canceling summer classes and activities, and closing all campuses and buildings on Monday and Tuesday.

Beryl was a tropical storm on Sunday in the Gulf of Mexico, but is expected to strengthen overnight and make landfall on the Texas Gulf Coast as a Category 1 hurricane early Monday morning, according to the National Hurricane Center.

-ABC News' Gina Sunseri

Beryl remains a tropical storm but was gaining strength over open warm waters of the Gulf of Mexico and is forecast to be a Category 1 hurricane by Sunday night and is expected to make landfall on the Texas coast early Monday, according to the National Hurricane Center.

In an update on Beryl's path issued at 10 a.m. CT, the hurricane center said winds generated by Beryl had slightly increased to 65 mph.

"Beryl [is] becoming better organized and forecast to become a hurricane before landfall," the hurricane center said in its latest update.

The storm is expected to make landfall on the middle Texas Coast near Matagorda Bay on Monday.

A Hurricane Warning has been issued for the Gulf Coast from Baffin Bay north to San Luis Pass. A Storm Surge Warning was also issued for the coast of Texas from High Island to Sabine Pass.

"Beryl is forecast to become a hurricane again later today. Continued strengthening is expected overnight before Beryl reaches the Texas coast," according to the hurricane center's statement.

The hurricane center warned that a few tornadoes could also occur along the middle and upper Texas Coast through Sunday night and across eastern Texas and western
Louisiana on Monday.

In addition to storm surges of up to 6 feet, Beryl is expected to dump heavy rain on the Texas coastal cities.

"Heavy rainfall of 5 to 10 inches with localized amounts of 15 inches is expected across portions of the middle and upper Texas Gulf Coast and eastern Texas beginning today through Monday night," the hurricane center said.

The White House said Sunday that President Joe Biden is monitoring Beryl as FEMA prepositions response teams.

"The President and his team continue to monitor Tropical Storm Beryl as it makes its way towards South Texas," a White House official said. "We are in close contact with our state and local counterparts and FEMA has prepositioned response personnel, search and rescue teams, bottled water, meals, tarps and electric generators in case they are needed. On Sunday, FEMA activated its National Response Coordination Center (NRCC) to further support local response efforts."

-ABC News' Daniel Amarante

Beryl remained early Sunday a tropical storm with winds of 60 mph.

The storm has been slow to strengthen over the past several hours, which is potentially good news for the residents of the Texas coast.

Even though strengthening is expected, each hour that this storm delays that intensification will help contribute to a weaker storm upon landfall.

A hurricane warning is in effect from Baffin Bay to San Luis Pass.

A storm surge warning is in effect for Corpus Christi Bay, Matagorda Bay, and Galveston Bay. During the peak of the storm on Monday morning, surge may reach 4 to 6 feet above normal tide in Mesquite Bay and Matagorda Bay.

There are also numerous other hurricane watches, tropical storm watches and warnings, and storm surge watches across the Texas coast.

Beryl is still forecast to make landfall near Matagorda Bay as a Category 1 Hurricane on Monday morning.

-ABC News’ Daniel Amarante

An island city on the Gulf Coast of Texas issued a voluntary evacuation of the island's west end, Galveston officials said in a press release on Saturday.

While officials feel the chances of tides above five feet are currently very low, tides above that level could prevent travel on major roads and make it difficult for the city to respond to emergencies, the press release said.

Brian Maxwell, Galveston city manager, noted that predictions for the track of Beryl have not changed.

The size of Beryl has expanded slightly, according to the National Weather Service, and as a result, the island’s west end is currently under a storm surge warning.

Mayor Craig Brown "signed the order out of an abundance of caution," said Maxwell.

If residents choose to stay in a low-lying area, they may not be able to safely leave for several hours, and emergency services may not be available while tides remain elevated, emergency management officials said.

Power has been knocked out to more than 2.7 million customers in Texas as Hurricane Beryl slams the state with powerful winds and torrential rain.

ABC Houston station KTRK briefly lost power in its newsroom Monday morning.