A weak upper level disturbance approached South Texas and provided just enough mid-level drying and cooling to destabilize the atmosphere during the hottest part of the day. Scattered thunderstorms quickly developed along and just east of the mountains by 4 to 5 pm and by early evening, storms organized across the South Texas Brush Country and the Rio Grande Plains. Energy and boundaries from the storms combined with speedy west to east winds well above the surface and organized them into a line just before sunset. Initial lines along the forming ling produced strong gusty winds that caused pockets of damage in Jim Hogg, Zapata, and Starr County.  Two clusters of developing storms merged into a northeast to southwest oriented line at around 7 pm, extending from western Starr County through western Brooks County. The line would plow eastwards, with a number of individual stronger cells embedded within the line. As the line neared Hidalgo County, the strongest cells were found north of the Rio Grande Valley. The action continued to press southeast during the mid-evening. After a slight weakening, the squall reintensified as it moved east of US 77 from southern Kenedy County to the Rio Grande River. The strongest measured wind gusts occurred between 10 and 1130 pm in these areas, with many locations recording gusts over 50 mph. The storms knocked out power to some communities, including parts of South Padre Island, and caused significant disruption to evening flights in and out of Harlingen and Brownsville.

Thunderstorm Wind in CAMERON, TEXAS
From 09-MAY-14 21:24:00 to 09-MAY-14 21:34:00 (CST-6)
Location: PORT ISABEL
Magnitude: 50.00 MG
Crop damage: 0.00K
Reported by: Coast Guard

The U.S. Coast Guard weather station, on the bayside of South Padre Island just south of the Queen Isabella Causeway, recorded a wind gust of 50 knots (58 mph).  Shortly after, power outages were reported across the southern portion of South Padre Island.

Thunderstorm Wind in ZAPATA, TEXAS
From 09-MAY-14 17:34:00 to 09-MAY-14 17:43:00 (CST-6)
Location: ZAPATA ARPT
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported the roof of a bakery partially removed and blown onto Highway 83 in Zapata.

Thunderstorm Wind in JIM HOGG, TEXAS
From 09-MAY-14 17:40:00 to 09-MAY-14 18:05:00 (CST-6)
Location: HEBBRONVILLE
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Jim Hogg County EM reported powerlines down over the roadway in Hebbronville.

Thunderstorm Wind in JIM HOGG, TEXAS
From 09-MAY-14 17:47:00 to 09-MAY-14 17:54:00 (CST-6)
Location: HEBBRONVILLE
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported wind damage to trailers and trees in the South Fork Estates at the intersection of FM 3073 and Highway 16.

Thunderstorm Wind in STARR, TEXAS
From 09-MAY-14 18:28:00 to 09-MAY-14 18:40:00 (CST-6)
Location: RIO GRANDE CITY
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

Public reported multiple large tree limbs down FM 755.

Thunderstorm Wind in BROOKS, TEXAS
From 09-MAY-14 18:44:00 to 09-MAY-14 18:58:00 (CST-6)
Location: FALFURRIAS
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported several power lines downed in Falfurrias and in the county on Highway 206.

Thunderstorm Wind in BROOKS, TEXAS
From 09-MAY-14 18:44:00 to 09-MAY-14 18:58:00 (CST-6)
Location: FALFURRIAS ARPT
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported several power lines downed in the county on Highway 219 and 223.

Thunderstorm Wind in HIDALGO, TEXAS
From 09-MAY-14 19:40:00 to 09-MAY-14 19:50:00 (CST-6)
Location: EDCOUCH
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported wind gusts of an estimated 55 to 60 mph in Edcouch.

Thunderstorm Wind in WILLACY, TEXAS
From 09-MAY-14 19:32:00 to 09-MAY-14 19:40:00 (CST-6)
Location: LA SARA
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported a semi truck blown over at FM 1015 and Highway 186.

Thunderstorm Wind in WILLACY, TEXAS
From 09-MAY-14 19:45:00 to 09-MAY-14 19:52:00 (CST-6)
Location: LYFORD
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported trees down in the city of Lyford.

Thunderstorm Wind in HIDALGO, TEXAS
From 09-MAY-14 19:23:00 to 09-MAY-14 19:40:00 (CST-6)
Location: CHIHUAHUA
Magnitude: 43.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported signs blown down on Interstate 2 in Palmview.

Thunderstorm Wind in HIDALGO, TEXAS
From 09-MAY-14 19:23:00 to 09-MAY-14 19:35:00 (CST-6)
Location: EDINBURG
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Several power poles down and power lines tangled in trees were reported throughout the city of Edinburg by the local fire department.  Radar estimated potential wind gusts in excess of 50 knots (58 mph) from the bow echo within the squall line, which would imply such gusts in pockets despite the measurement at the Edinburg International Airport, about 8 miles north-northeast of town, of 39 knots (45 mph).

Thunderstorm Wind in HIDALGO, TEXAS
From 09-MAY-14 19:23:00 to 09-MAY-14 19:40:00 (CST-6)
Location: MISSION
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement had several reports of trees and powerlines down in Mission.    The peak wind gust at McAllen/Miller Airport was 43 knots (48 mph) at 1935 CST, but from the multiple data reports it is assumed that pockets of wind reached 50 knots or higher in portions of Mission.

Thunderstorm Wind in HIDALGO, TEXAS
From 09-MAY-14 19:00:00 to 09-MAY-14 19:00:00 (CST-6)
Location: MISSION
Magnitude: 50.00 EG
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Media reported damage to a corrugated metal building, near the intersection of Inspiration Road and Highway 83 in Mission. At approximately the same time, one large limb weighing at least 100 pounds was blown off a mesquite tree nearby.