A broken line of thunderstorms marched across the Rio Grande Valley through the late afternoon and evening hours and combined with other development across Nuevo Leon and Tamaulipas, Mexico to form a convective system. This initially stabilized the atmosphere and held back development. However, the continued flow from the east/northeast ran into northward moving boundaries from storms in Tamaulipas/Nuevo Leon to form a severe storm over Port Isabel and South Padre Island, with the first report of large hail at 745 pm LST. Soon after, outflow from this storm would link up with others from the Mexico storms and a small but potent local convective system soon formed between Harlingen and Brownsville. Downburst winds, reached 58 mph at KHRL and knocked down a number of power lines, blew some shingles off one apartment complex, and blew off at least one poorly fastened carport on the east side of Harlingen. Strong winds from the south, once again, due to the sharp difference in high and low pressure within the region ��� propagated through the Lower Rio Grande Valley, producing a 60 mph gust at KHRL just after 12 am LST on the 19th and causing additional damage to at least one tin roof (Bass Boulevard, west side) and at least one fence in town. Additional minor damage may have occurred in Brownsville during the same period, as the peak wind at KBRO reached 54 mph at 1255 am LST on the 19th. In addition intense rains dropped generally 2 to 4 inches in Brownsville, with several known poor drainage intersections seeing nuisance flooding.

Thunderstorm Wind in CAMERON, TEXAS
From 18-APR-16 21:09:00 to 18-APR-16 21:25:00 (CST-6)
Location: (HRL)RIO GRANDE ARPT
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Harlingen Police Department reported power lines down at 809 West Hanson, 1307 North Ann Street, 1506 South G Street, 629 North 13th Street, the intersections of Tyler and L, 25th and Rio Hondo Road, and Grimes and Morgan. The winds also blew some shingles off one apartment complex, and blew off at least one poorly fastened carport on the east side of Harlingen.

Thunderstorm Wind in CAMERON, TEXAS
From 18-APR-16 21:16:00 to 18-APR-16 21:16:00 (CST-6)
Location: (HRL)RIO GRANDE ARPT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

ASOS at the Rio Grande Valley International Airport in Harlingen recorded a peak wind gust of 58 mph.

Heavy Rain in CAMERON, TEXAS
From 18-APR-16 21:00:00 to 18-APR-16 22:45:00 (CST-6)
Location: MAUDLIN ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Brownsville Police Department reported water covering roads with cars being stuck in the water along portions of Palm Boulevard, Boca Chica, Alton Gloor, and Expresway 77. CoCoRaHS observers reported rainfall totals of 3 to almost 4 inches.

Thunderstorm Wind in CAMERON, TEXAS
From 18-APR-16 21:26:00 to 18-APR-16 22:00:00 (CST-6)
Location: BROWNSVILLE
Magnitude: 43.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Brownsville Police Department reported three electrical poles down along U.S. Highway 281.

High Wind in CAMERON, TEXAS
From 19-APR-16 00:09:00 to 19-APR-16 00:09:00 (CST-6)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

ASOS at Rio Grande Valley International Airport in Harlingen reported a wind gust of 60 mph.

High Wind in CAMERON, TEXAS
From 19-APR-16 00:05:00 to 19-APR-16 00:15:00 (CST-6)
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

High winds damaged the metal roofs of three units at the Sun Valley Acres Retirement Park on the west side of Harlingen.

Strong Wind in CAMERON, TEXAS
From 19-APR-16 00:35:00 to 19-APR-16 00:45:00 (CST-6)
Magnitude: 47.00 EG
Property damage: 0.20K
Crop damage: 0.00K
Reported by: NWS Employee

Off duty NWS employee reported 8 inch diameter tree limb partially blocking the road near the intersection of Jaime J Zapata and Ray David Drive. The nearby ASOS at KBRO reported a gust of 54 mph.

Hail in CAMERON, TEXAS
From 18-APR-16 19:40:00 to 18-APR-16 19:50:00 (CST-6)
Location: PORT ISABEL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Several public reports through social media of quarter sized hail on South Padre Island.