An upper level disturbance sliding across the Rio Grande Valley combined with a hot humid air mass which, aided by a westward moving sea breeze, allowed strong to severe thunderstorms to develop rapidly over the Lower and Middle Rio Grande Valley during the afternoon of Monday, June 7, 2010. A damaging microburst, several funnel clouds, large hail, and urban and flash flooding occurred between 245 PM CST and a little after 5 PM CST.

Hail in HIDALGO, TEXAS
From 07-JUN-10 15:52:00 to 07-JUN-10 15:52:00 (CST-6)
Location: EDINBURG MUNI ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny sized hail was reported in McAllen on Cynthia Street near the Wellness Center in the northeast portion of the city.

Hail in HIDALGO, TEXAS
From 07-JUN-10 14:48:00 to 07-JUN-10 14:48:00 (CST-6)
Location: EDINBURG
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS Student Volunteer (Oklahoma University) reported penny size hail near Edinburg.

Thunderstorm Wind in HIDALGO, TEXAS
From 07-JUN-10 14:45:00 to 07-JUN-10 14:47:00 (CST-6)
Location: DONNA
Magnitude: 61.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A microburst tore through a colonia (migrant community) between Donna and Alamo, causing significant damage to mainly mobile homes and other unanchored structures. Two mobile homes were completely destroyed, and one under construction wood framed home collapsed.  One outbuilding overturned.  A third mobile home lost its roof.  Each of the destroyed mobile homes were older and had questionable structural integrity.  One of the homes rolled and was not secured properly. The other had a residential addition, which was destroyed.
In the tipped over home, a mother, three children, and an infant were inside but fortunately were left uninjured.  Photographs showed most small trees remained standing, as were nearby single family homes.  Estimates from damage photos, media coverage, and emergency management quick response surveys suggested a pulse gust between 65 and 70 mph caused the damage.
Slightly lower winds knocked down several trees in nearby Alamo.

Hail in HIDALGO, TEXAS
From 07-JUN-10 15:34:00 to 07-JUN-10 15:42:00 (CST-6)
Location: DONNA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail up to one inch in diameter fell south of Old 83 Highway south of Donna during a thunderstorm that moved through the Donna area in the afternoon.

Hail in HIDALGO, TEXAS
From 07-JUN-10 15:57:00 to 07-JUN-10 16:15:00 (CST-6)
Location: SAN JUAN
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

A prolonged intense updraft was nearly stationary in the Donna-Alamo-San Juan area for nearly an hour, and at least two known quarter sized hail reports were received by the NWS office in Brownsville.  The first occurred at 357 PM CST along Business Highway 83 in San Juan, reported by a trained spotter, and a second occurred in Alamo at around 410 PM CST, reported by the general public. Hail of equal of larger size may have continued beyond this time, but no further data were available as of this writing.

Thunderstorm Wind in HIDALGO, TEXAS
From 07-JUN-10 15:56:00 to 07-JUN-10 16:05:00 (CST-6)
Location: SAN JUAN
Magnitude: 54.00 MG
Crop damage: 0.00K
Reported by: Broadcast Media

A local broadcast meteorologist reported a wind gust of 62 miles per hour during a strong pulse thunderstorm that affected Pharr.

Flash Flood in HIDALGO, TEXAS
From 07-JUN-10 16:15:00 to 07-JUN-10 17:30:00 (CST-6)
Location: DONNA
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several roads were under 2 to 3 feet of water from Donna to Alamo during the late afternoon commute after torrential downpours from nearly stationary strong to severe thunderstorms dropped an estimated 4 to 6 inches of rain in 2 hours or less.  Photographs verified the high water, including some where water was encroaching on property in both areas.

Funnel Cloud in HIDALGO, TEXAS
From 07-JUN-10 16:20:00 to 07-JUN-10 16:32:00 (CST-6)
Location: DONNA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A persistent funnel cloud was viewed by two local residents in the Weslaco/Donna area during the early evening of June 7th.  A resident in Donna reported a funnel on the south side of town reaching halfway to the ground at 420 PM CST.  Another resident on the southwest side of Weslaco viewed another funnel, possibly from the same parent storm, 12 minutes later southwest of the intersection of Hopper Road and 34th Street on the southwest side of town.  The second funnel lasted only a minute. Touchdowns were not witnessed in either case.

Lightning in HIDALGO, TEXAS
From 07-JUN-10 16:40:00 to 07-JUN-10 16:55:00 (CST-6)
Location: WESLACO
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A structure fire was reported in Weslaco near the intersection of Salinas and Mile 12 North Road. The fire began after a thunderstorm moved through the area during the afternoon producing numerous lightning strikes in which a lightning bolt started the blaze.