Southeastern Texas has been pummeled with unprecedented flooding this weekend after the arrival of Hurricane Harvey, leaving thousands of residents stranded and in need of help.

Here are some ways to assist victims of the storm:

The National Voluntary Organizations Active in Disaster (NVOAD)

FEMA is referring people to NVOAD, a coalition of the major voluntary organizations in the U.S. that have prioritized disaster-related work.

The organization's website provides information for people looking to donate or volunteer.

American Red Cross

The American Red Cross, a humanitarian organization that provides emergency assistance and disaster relief in times of crisis, is seeking donations to help victims of Harvey.

The organization is urging people to call 1-800-RED CROSS or text HARVEY to 90999 to make a $10 donation for those in need.

"The American Red Cross is helping the people affected by Hurricane Harvey in Texas and all across the Gulf coast. Shelters are open, truck loads of supplies are being distributed and volunteers [are] in place," a statement on the organization's website said.

Salvation Army Emergency Disaster Services

Salvation Army Emergency Disaster Services is the relief arm of the charitable organization, which is part of the universal Christian Church. The organization is taking donations to provide "physical, emotional and spiritual care to survivors and relief workers."

Donors can call 1-800-SAL-ARMY to help.

South Texas Blood and Tissue Center

The local blood center placed Hurricane Harvey on the splash page of its website prior to it making landfall, and is still seeking donations to help those affected by the storm.

Catholic Charities USA

Catholic Charities USA, a Catholic social service organization, is seeking donations to help those who have been affected by Harvey.

The group has set up a website devoted to Harvey relief, and explains that "long term recovery" is part of the group's approach to disasters like this one.

"Catholic Charities USA (CCUSA), the official domestic relief agency of the U.S. Catholic Church, needs your support to ensure the delivery of compassionate care and support to individuals affected by disasters. Our agencies provide essential support before, during and after disasters hit," the statement says. "In fact, long-term recovery is an integral part of Catholic Charities’ holistic approach and we work tirelessly to ensure individuals can live their lives with the dignity we all deserve. This service is provided to the community regardless of religion, social or economic background."

Austin Pets Alive!

Austin Pets Alive!, an animal shelter and no-kill pet advocacy group seeking assistance to help with pets, has created a page on its websitespecific to Hurricane Harvey-related needs.

"Austin Pets Alive! has been helping shelters in the direct line of Hurricane Harvey. We’ve been working with these shelters to transport as many pets as possible to APA! and as of Saturday morning, we’ve transported over 235 animals to our shelter," a statement on the website says. "Because of the incredible, humbling support we’ve received from the community thus far, we have been able to remove some items from our needs list completely."