A strong 500mb shortwave aided in the development of two thunderstorm complexes that impacted Deep South Texas and the Rio Grande Valley on May 23rd and 24th. The first complex began shortly after 6 PM in Zapata County and inched southeastward across the region before becoming nearly stationary in Cameron and Willacy Counties around 2 AM on the morning of the 24th. This lead to numerous reports of flooding and several reports of damaging wind, especially in central Hidalgo County, where the worst of the damage was reported.
The second complex developed in northern Mexico and entered Zapata County around 4 AM on the morning of May 24th, which helped to spark several showers and storms ahead of it in Starr County. This is when there were several reports of hail. Also, additional flooding occurred in southern Hidalgo and Cameron Counties. By the time all was said and done, much of the Rio Grande Valley had picked up between 2 to 6 inches of rain, with locally higher 5 to 9 inches in parts of Zapata and Starr Counties.

Hail in ZAPATA, TEXAS
From 23-MAY-22 19:20:00 to 23-MAY-22 19:20:00 (CST-6)
Location: ZAPATA ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The Zapata County Fire Department reported hail the size of a quarter, or 1.0, in Zapata at 8:20PM CDT.

Thunderstorm Wind in HIDALGO, TEXAS
From 23-MAY-22 22:00:00 to 23-MAY-22 22:00:00 (CST-6)
Location: EDINBURG YARD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Additional pictures of tree damage was shared by the public near the intersection of Interstate 69C and Davis Road in Hidalgo County.

Hail in STARR, TEXAS
From 23-MAY-22 21:00:00 to 23-MAY-22 21:00:00 (CST-6)
Location: SANTA ELENA
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

A homeowner interviewed by a local television station reported ping pong to golf ball sized hail, which damaged his roof and several of his windows. He also reported severe damage to trees, shingles, and a destroyed wooden playground due to very gusty winds.

Hail in HIDALGO, TEXAS
From 24-MAY-22 03:15:00 to 24-MAY-22 03:40:00 (CST-6)
Location: LA TOYA
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media reports of quarter to ping pong sized hail fell on the Palmview area in southwestern Hidalgo County around 4:22AM CDT on May 24th. There were additional areas of hail of pea to dime sized hail in La Joya and the Mission area around the same times.

Flash Flood in STARR, TEXAS
From 24-MAY-22 02:00:00 to 24-MAY-22 04:30:00 (CST-6)
Location: LA CASITA
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Social Media

Social media pictures showed several submerged cars that were being removed from flood waters from the heavy rain the night before. Flood depth of 3 to 4 feet is estimated due to how high the water was on the cars.

Flash Flood in ZAPATA, TEXAS
From 23-MAY-22 20:00:00 to 24-MAY-22 00:00:00 (CST-6)
Location: ZAPATA
Flood cause: Heavy Rain
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Social Media

Video on social media shows several feet of fast moving water near Medina Street - a flood-prone area known as Medina Addition - with two SUVs that had been swept off the road and into a ditch. Video later shows the vehicles getting dragged out of the ditch by a tow truck. Based on the during and after videos, it is estimated that 3 to 4 feet of fast flowing water was moving across the road at the height of the flash flooding. Additional video shows people having to abandon homes during the height of the flooding and the water coming up to their waists, which supports the 3 to 4 foot estimates of fast moving water. A report of 8 of rain came in from just northwest of Zapata from this storm. The local newspaper in Zapata County later reported that at least 15 homes were affected with many of them losing their furniture, clothing, and household items.

Thunderstorm Wind in HIDALGO, TEXAS
From 23-MAY-22 22:00:00 to 23-MAY-22 22:00:00 (CST-6)
Location: MC COOK
Magnitude: 56.00 EG
Property damage: 0.00K
Reported by: COOP Observer

Power lines and crop damage (light to severe) were reported by the COOP observer in McCook. He also reported pea to nickel sized hail as the storms rolled through.

Thunderstorm Wind in HIDALGO, TEXAS
From 23-MAY-22 22:05:00 to 23-MAY-22 22:15:00 (CST-6)
Location: LINDSAY GARDENS
Magnitude: 56.00 EG
Property damage: 110.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A manufactured home resting on cinder blocks was blown off of the cinder blocks. The metal roof of another manufactured home was completely lifted up and torn off. Another manufactured home was flipped over on its side. Large branches of several trees were broken. Fencing was knocked down next to manufactured home blown off the cinder blocks.  Several other homes in the neighborhood, known locally as a colonia, had minor roof and siding damage.  Two persons were injured at one of the homes, one whose hand was injured by corrugated siding that had blown between two sections of the structure.

Thunderstorm Wind in HIDALGO, TEXAS
From 23-MAY-22 22:25:00 to 23-MAY-22 22:30:00 (CST-6)
Location: FAYSVILLE
Magnitude: 70.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The metal roof of the Segovia State Prison Unit was peeled back. A large metal shipping container next to the Lopez State Prison Unit was rolled several times due to the wind. Several trees with large branches were broken. A large tree was uprooted in front of the Lopez State Prison Unit.

Thunderstorm Wind in STARR, TEXAS
From 23-MAY-22 21:00:00 to 23-MAY-22 21:05:00 (CST-6)
Location: SANTA ELENA
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

A homeowner interviewed by a local television station reported severe damage to trees, shingles, and a destroyed wooden playground due to very gusty winds. He also reported ping pong to golf ball sized hail, which damaged his roof and several of his windows.  Radar indicated this storm strengthening with the potential for even higher wind gusts as it moved into extreme eastern Starr County, but there were not additional corroborating reports as of this writing.