Tuesday night through Wednesday morning of May 11th into May 12th, a 500 mb shortwave trough worked from northwest to southeast from the Texas Big Bend through Deep South Texas and the Rio Grande Valley, bringing a late-season cold front through the region. The Storm Prediction Center (SPC) forecasted a Marginal Risk of severe weather for the Rio Grande Plains/Brush Country and parts of the Lower Rio Grande Valley for this time period. While large hail was a potential threat, damaging winds took center stage as the squall line at the leading edge of the front tore through the Rio Grande Valley. Even more impressive was the strong, damaging winds behind the squall line associated with a ���wake low��� that lasted for several hours on the morning of May 12th. Later on during this event, some street flooding was observed in the San Benito area due to heavy rain.

Thunderstorm Wind in HIDALGO, TEXAS
From 11-MAY-21 23:46:00 to 12-MAY-21 00:05:00 (CST-6)
Location: RED GATE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

As thunderstorms moved through the area, the RAWS site at Linn-San Manuel measured a wind gust to 60 mph or 52 knots.

Thunderstorm Wind in HIDALGO, TEXAS
From 12-MAY-21 00:05:00 to 12-MAY-21 00:25:00 (CST-6)
Location: PHARR
Magnitude: 56.00 EG
Reported by: Emergency Manager

As thunderstorms moved through the area, an anemometer at the Pharr Emergency Operations Center measured a wind gust to 73 mph, or 63 knots.  The anemometer is situated 90 feet (27 meters) above the ground, nearly three times higher than standard NWS measuring equipment and more than four times higher than eye level; wind speed listed here (56 knots) was reduced to account for near-ground friction.

Thunderstorm Wind in HIDALGO, TEXAS
From 11-MAY-21 23:59:00 to 12-MAY-21 00:20:00 (CST-6)
Location: (MFE)MILLER INTL ARP
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

As thunderstorms moved through the area, the ASOS station at the McAllen airport measured a gust to 63 mph, or 55 knots. Gusts of 54 knots or higher lasted for about 20 minutes, based on the station reports.

Thunderstorm Wind in HIDALGO, TEXAS
From 11-MAY-21 23:40:00 to 12-MAY-21 00:00:00 (CST-6)
Location: SAN MANUEL
Magnitude: 52.00 EG
Property damage: 7.50K
Reported by: Public

Numerous reports on social media of trees damaged or uprooted near the Linn-San Manuel area.

Thunderstorm Wind in HIDALGO, TEXAS
From 12-MAY-21 00:25:00 to 12-MAY-21 00:35:00 (CST-6)
Location: MERCEDES
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: Public

Numerous reports received via social media of tree damage and tree branches down on vehicles near Mercedes. Time was estimated via radar and based on NWS Storm Survey on damage from Donna to just east of Weslaco.

Thunderstorm Wind in HIDALGO, TEXAS
From 11-MAY-21 23:40:00 to 12-MAY-21 00:00:00 (CST-6)
Location: LINN
Magnitude: 61.00 EG
Property damage: 10.00K
Reported by: Public

Social media report of a damaged carport and a barn roof torn off in the Linn area. Time was estimated via radar.

Thunderstorm Wind in ZAPATA, TEXAS
From 11-MAY-21 21:00:00 to 11-MAY-21 21:05:00 (CST-6)
Location: ZAPATA ARPT
Magnitude: 61.00 EG
Property damage: 45.00K
Reported by: NWS Storm Survey

More than two dozen structures sustained varying damage to
poorly constructed wood, asphalt, and aluminum/tin roofs,
roof decking, and shingles in the Siesta Shores and Falcon
Heights neighborhoods in south Zapata, Texas. A poorly seated
cinder block knee wall and attached fence was blown down, and
a 100-foot tall thin metal tower was twisted. A few power poles
were knocked down by by flying aluminum roof pieces. Dozens of
medium mesquite limbs were blown down by flying aluminum roof
pieces.

Thunderstorm Wind in STARR, TEXAS
From 11-MAY-21 21:50:00 to 11-MAY-21 22:15:00 (CST-6)
Location: ESCOBARES
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: NWS Storm Survey

An NWS Storm Survey team on the way out to the City of Zapata noted at least a dozen mainly mesquite, live oak, and ebony trees large limbs blown down between Rio Grande City and Roma.  A social media report also noted an uprooted tree in the Escobares area. Time was estimated via radar.

Thunderstorm Wind in HIDALGO, TEXAS
From 12-MAY-21 00:11:00 to 12-MAY-21 00:20:00 (CST-6)
Location: DONNA
Magnitude: 61.00 EG
Property damage: 23.00K
Reported by: NWS Storm Survey

At least a half dozen manufactured homes sustained
damage, mainly from peeled-back or blown off tin roofs, and car ports
knocked down, in portions of Donna and Weslaco along and near the
Interstate 2 corridor. One home slid off its foundation midway between
the cities. Several mesquite and ash trees were uprooted,
split, or lost large limbs. One uprooted large tree damaged a car
in Donna.  Several parts of fences were blown down, and unanchored road
signs were also blown down.

Thunderstorm Wind in CAMERON, TEXAS
From 12-MAY-21 01:10:00 to 12-MAY-21 01:13:00 (CST-6)
Location: HUISACHES
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off-duty NWS Employee noted five large limbs blown down from mesquite trees in west-central San Benito. Wind speed estimated based on similar accounts of tree damage with the same squall line.

Thunderstorm Wind in CAMERON, TEXAS
From 12-MAY-21 01:18:00 to 12-MAY-21 01:30:00 (CST-6)
Location: BROWNSVILLE
Magnitude: 52.00 EG
Property damage: 2.00K
Reported by: NWS Employee

Off-duty NWS Employee reported several tree limbs up to 5 inches in diameter snapped off of trees nearby. Time and duration was estimated via radar.