Tropical Storm Alberto makes landfall in Mexico; Texas faces flooding and heavy rain

The first named storm of the hurricane season made landfall in Mexico on Thursday, bringing heavy rain and flooding to the country's Gulf Coast and to Texas.

Alberto, which weakened from a tropical storm to a depression,is moving inland over Mexico with maximum sustained winds of 35 mph, the National Hurricane Center said in an update at 10a.m. local time.

Heavy rains and gusty winds were starting to subside for the Texas coast, but moderate coastal flooding was likely through the morning, the National Hurricane Center said in a public advisory. Life-threatening flooding and mudslides were likely in some areas of northeastern Mexico, it said.

A tropical storm warning that was in effect for the Texas coast from San Luis Pass southward to the mouth of the Rio Grande was lifted early Thursday. A warning remained in effect for the northeastern coast of Mexico south of the mouth of the Rio Grande to Tecolutla, it said.

Already on Wednesday, parts of Texas experienced at least moderate flooding with streets transformed into waterways.

Gov. Greg Abbott on Wednesday issued a disaster declaration for 51 Texas counties as the storm advanced, "to ensure Texans and at-risk regions have the resources and personnel needed to respond to this storm," he said in a statement.

The Texas A&M Forest Service mobilized at least four teams comprising 100 personnel and 24 vehicles, while the Texas National Guard had three platoons with a total of more than 40 personnel, along with 20 vehicles, including Chinook helicopters, at the ready.

More from NBC News:

The National Weather Service advised residents in areas expected to be affected by the storm to have at least five to seven days' worth of food, water and other essential supplies on hand.

In