This story is being updated throughout Monday morning.

Several schools in North Dallas, Richardson and Garland have cancelled classes on Monday, trying to assess damage on their campuses after a tornado rumbled through the area late Sunday night.

Dallas ISD cancelled classes at 20 campuses, 14 because of power outages and six because of “extensive” storm damage. The DISD schools closed for damage are:

​Edward H. Cary Middle School

​Leonides Gonzalez Cigarroa Elementary School

​John J. Pershing Elementary School

​Thomas Jefferson High School

​Walnut Hill Elementary School​

David G. Burnet Elementary School

Several of those schools, particularly Walnut Hill and Cary, were hit hard by the storm as it pushed down Walnut Hill Lane in North Dallas.

Windows out of the front of the school, which isn’t good — Because that line of storms brought sheets of rain pic.twitter.com/BZFGmjOFzB — Corbett Smith (@corbettsmithDMN) October 21, 2019

The district is asking that staff members from Cary, Cigarroa, TJ and Walnut Hill to report for work by 10 a.m at Thomas A. Edison Learning Center, 2940 Singleton Blvd. DISD staff members from Pershing are to report by 10 a.m. to the Dallas ISD Administration building, 9400 N. Central Expressway.

Buses that pick up students from those campuses to take to other specialty schools will not operate on Monday, according to the district.

Because of “safety concerns and power outages,” Dallas ISD will also not hold classes at the following schools:

Caillet ES

Dealey Montessori

Foster ES

Franklin MS

Hexter ES

Hillcrest HS

Kramer ES

Joe May ES

Francisco Medrano MS

Thelma Page Richardson ES

Roosevelt HS

Twain ES

South Oak Cliff at Village Fair

Staff are not to report to those 14 DISD campuses on Monday, according to district communications.

Richardson ISD announced early Monday morning that it was cancelling all classes and events districtwide for the day.

“Due to substantial storm damage, power outages and unsafe conditions, all RISD schools and offices will be closed on Monday, October 21,” a Richardson ISD message read. "All school and district activities and will also be cancelled on Monday. Many neighborhoods in the southern and eastern areas of RISD have been damaged and are without power, and central RISD facilities, including Transportation, have also been impacted. "

The district noted that it “anticipates” all schools to be open Tuesday but would update that message throughout the day.

Midlothian ISD is also cancelling classes and activities at all of its campuses on Monday, after a strong storm knocked out power through Ellis and the southern parts of Dallas County.

Due to this evening’s storm resulting in a widespread power outage, Midlothian ISD is canceling classes tomorrow, Oct. 21. Principals, assistant principals, custodial and maintenance, along with L.A. Mills Administration staff will report at 8 a.m. at their normal location. pic.twitter.com/1ujMooQ7UA — Midlothian ISD (@MidlothianISD) October 21, 2019

Four schools will be closed in Garland ISD on Monday: Dorsey Elementary, Park Crest Elementary, Williams Elementary and Sam Houston Middle School.

Buses will be operating as normal, according to the district, but delays could occur because of power outages and storm damage throughout the district, a Garland ISD communique said.

Episcopal School of Dallas will be closed on Monday, according to its social media channels.

Dallas Lutheran School, just east of U.S. 75 between Forest and Royal Lanes, suffered significant exterior damage -- and is closed today.

Classes and activities at St. Mark’s School of Dallas are also cancelled Monday, as school officials “assess damage to campus,” a message on its website stated.

“For safety reasons, do not attempt to come to campus,” the message read.

Ursuline Academy, located on Walnut Hill Lane between Midway and Inwood Roads, is closed on Monday because of power outages.

“Seniors should not go to service,” a message from Ursuline read. “We will keep you updated as we receive further information. Stay safe!”

The Hockaday School will also be closed on Monday.

Grand Prairie High School will begin classes at 10 a.m. because of power outages. The buses for that campus will also be on a two-hour delay.

Jesuit College Preparatory posted on its website that its school will begin at 9 a.m. and 3:05 p.m. on Monday.

Classes at the main campus of Dallas County Community College District’s Richland College and the LeCroy Center are closed on Monday, because of power outages. The school’s Garland campus is open, with normal operating hours.

Staff writer Eva-Marie Ayala and director of digital strategy Nicole Stockdale contributed to this story.