A strong squall line associated with a frontal boundary and weak upper level disturbance moved into the forecast area causing widespread severe weather and isolated flooding. A Severe Thunderstorm Watch was issued at 6:10 PM CDT and remained in effect until 1 AM CDT and was then extended until 5 AM as the line continued to push south. Damage reports began reaching the office around 9:30 PM CDT (8:30 MDT) as the line entered the northwestern portion of the forecast area and continued until 3:30 AM CDT when the line exited the forecast area.
As the storm entered Lea County New Mexico, reports of wind speeds in excess of 70 mph began coming into the office. These high winds continued as the line surged forward into West Texas. In Seminole, 98 mph (measured) wind speeds toppled several radio towers including a 320 foot tower that fell on a church and bus damaging both. In addition, the roof of Beall's Department store was destroyed and two mobile homes were rolled and destroyed injuring four people.
As the line continued its southward progression, so did the damaging winds. Many locations began experiencing power outages including two of the three television stations in the Midland/Odessa area, and Midland International Airport. WFO Midland and the Gaines County Emergency Operation Center continued working on back up generator power until commercial power was restored to the area.  A 93 mph wind gust was measured at Midland International Airport just prior to the power loss, which rendered it inoperable for the remainder of the night.
The event continued into the early morning hours on Wednesday, where Dryden reported a 63 mph wind gust prior to thunderstorms exiting the area.
Post storm damage surveys indicated that damage across the area was caused by a derecho. A derecho is a ���widespread and long-lived wind storm associated with a band of rapidly moving showers or thunderstorms.���
While straight-line winds are common across West Texas ��� especially during the late spring and early summer ��� the magnitude of the wind speeds for this event is quite rare. As an example, the 93 mph wind reported in Midland eclipsed the old record of 86 mph set in February 1960, and was the strongest wind ever recorded in Midland since the NWS began official record keeping in 1930.
During this long-lived weather episode, all but two of the 26 counties within WFO Midland���s CWA experienced severe weather. The majority of these locations experienced high wind events, which resulted in power outages across the area. Because of backup power capability, WFO Midland was able to maintain warning operations throughout the entire severe weather event.
Summary of measured wind reports:
Dryden (K6R6) - 55 kts (63 mph)
Big Spring (KBPG) - 51 kts (59 mph)
Fort Stockton (KFST) - 57 kts (66 mph)
Guadalupe Pass (KGDP) - 62 kts (71 mph)
Wink (KINK) - 58 kts (67 mph)
Midland (KMAF) - 81 kts (93 mph)*
Odessa (KODO) - 55 kts (63 mph)
Seagraves 1 SW (KSGV) - 66 kts (76 mph)
Andrews 2 E (KANS) - 51 kts (59 mph)*
Seminole 2 NNE (KSMS) - 85 kts (98 mph)*
Lamesa 2 SE (KLES) - 45 kts (52 mph)*
Gail 2 ESE (KGGS) - 43 kts (50 mph)*
Pecos (KPEQ) - 56 kts (64 mph)
McDonald Observatory - 61 kts (70 mph)
Tatum, NM Co-op Observer - 68 kts (78 mph)
*These sites lost power shortly after observations, it may be assumed that peak wind gusts were somewhat higher than observed.

Hail in MIDLAND, TEXAS
From 26-JUN-07 23:36:00 to 26-JUN-07 23:36:00 (CST-6)
Location: GREENWOOD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GAINES, TEXAS
From 26-JUN-07 21:21:00 to 26-JUN-07 21:21:00 (CST-6)
Location: SEMINOLE
Magnitude: 85.00 MG
Property damage: 5.00M
Crop damage: 0.00K
Reported by: Amateur Radio

A damage survey was conducted by NWS personnel the morning following the winds.  The results of the damage survey follow.
Winds were measured at 97.5 mph at the West Texas Mesonet site two miles north northeast of Seminole, however, there is visual indication that wind speeds in some locations around Seminole, were at times even stronger ��� estimated in the range of 100-120 mph. Communication tower damage, where a tower measuring 320 feet in height fell on a church and another tall tower was bent into the shape of a rectangle, both suggest higher wind speed estimates. Additionally, three miles east southeast of Seminole along County Road 402, at least eight wooden power poles were snapped just above the ground. This further supports the idea that winds were at times greater than 100 mph.
NWS personnel found many trees were uprooted and tree limbs down. The entire town of Seminole experienced damage, with areas just west of downtown and just east of town being hardest hit by the damaging winds.
The extent of the wind damage prompted the Gaines County EOC to request EMS/Fire assistance from Hobbs, NM. Included in the damage were two mobile homes that were rolled.  One of these homes had four people inside, including one infant.  All four were injured and the infant was kept for observation overnight at a Lubbock hospital.
Backup generators at the Emergency Operations center lost power as well as commercial power to much of Seminole.

Thunderstorm Wind in GAINES, TEXAS
From 26-JUN-07 21:14:00 to 26-JUN-07 21:25:00 (CST-6)
Location: SEAGRAVES
Magnitude: 66.00 MG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Mesonet

The West Texas Mesonet site one mile southwest of Seagraves (KSGV) recorded a wind gust of 76 mph.  Trees and power lines were downed, roofs were damaged and horse trailers were flipped over.  A tree limb went through a company vehicle.

Thunderstorm Wind in DAWSON, TEXAS
From 26-JUN-07 21:30:00 to 26-JUN-07 21:30:00 (CST-6)
Location: LAMESA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Strong winds blew a horse trailer into the street.

Thunderstorm Wind in ANDREWS, TEXAS
From 26-JUN-07 22:25:00 to 26-JUN-07 22:42:00 (CST-6)
Location: ANDREWS
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The West Texas Mesonet Station in Andrews (KANS) measured a 59 mph wind gust, power was lost to the station shortly thereafter and no other observations were received. Sixty to sevety mph winds were estimated by the public based on a heavy spare tire being blown around.
Trees were uprooted and power lines and poles were downed in Andrews as a result of high winds.  Additional damage included included a roof blown onto powerlines and several carports blown over.

Thunderstorm Wind in DAWSON, TEXAS
From 26-JUN-07 23:00:00 to 26-JUN-07 23:00:00 (CST-6)
Location: LAMESA
Magnitude: 51.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

High winds uprooted trees in Lamesa.

Thunderstorm Wind in HOWARD, TEXAS
From 26-JUN-07 23:46:00 to 26-JUN-07 23:55:00 (CST-6)
Location: BIG SPRING
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Automated Weather Observing Station at Big Spring (KBPG) recorded a wind gust to 59 mph.  Trained spotters reported mesquite trees bent in half by winds.

Thunderstorm Wind in PECOS, TEXAS
From 26-JUN-07 23:59:00 to 27-JUN-07 00:17:00 (CST-6)
Location: FT STOCKTON ARPT FST
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Automated Surface Observing System at Fort Stockton (KFST) recorded wind gusts to 66 mph.  No damage was reported.

Flash Flood in MIDLAND, TEXAS
From 26-JUN-07 23:45:00 to 27-JUN-07 15:00:00 (CST-6)
Location: (MAF) MIDLAND INTL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Eighteen inches of water accumulated in the underpass of Interstate 20 and Farm to Market Road 1788.  While water normally gathers here, pumps are available to pump the water out of the pass.  Because the power was knocked out by 93 mph winds, the pumps were inoperable and water remained throughout much of the following day.  The underpass was closed to traffic until the water was able to be pumped out.

Flash Flood in ECTOR, TEXAS
From 26-JUN-07 23:23:00 to 27-JUN-07 03:30:00 (CST-6)
Location: ODESSA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

City hall and the municipal plaza buildings were flooded in downtown Odessa.

Thunderstorm Wind in ECTOR, TEXAS
From 26-JUN-07 22:54:00 to 26-JUN-07 22:54:00 (CST-6)
Location: ODESSA
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Automated Surface Observing System at Odessa Schlemeyer (KODO) recorded a wind gust of 63 mph.  As this report came in, multiple reports of power outages in Odessa started being phoned into the office.  The Ector County emergency manager reported 20 power poles downed, 1500 customers without power, and two Texas Department of Transportation street signs, including a 48 inch flashing light sign.  Local broadcasters reported that a front porch detached from the house was torn up and thrown approximately 50 yards.

Thunderstorm Wind in MIDLAND, TEXAS
From 26-JUN-07 23:07:00 to 26-JUN-07 23:26:00 (CST-6)
Location: (MAF) MIDLAND INTL
Magnitude: 81.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: ASOS

The Automated Surface Observing Station at Midland International Airport (KMAF) recorded several wind gusts above 70 mph over a 20 minute period, including two of 93 mph.  Shortly after the third recorded gust of 93 mph the power went out to much of the area around the airport, including the ASOS.  Observations were missing for the next 12 to 16 hours as power was eventually restored and the ASOS was repaired.  The 93 mph wind gust is the highest wind gust recorded at Midland International Airport.
Also, a trained spotter in Midland measured an 80 mph wind gust along with power outages on Farm to Market Road 1788 near Texas State Highway 158.
Numerous reports of damage occured in Midland including: numerous trees downed across Midland, including one at a television station and numerous trees at two apartment complexes, north facing windows at an apartment complex in north Midland, and a roof blown off a mobile home at the intersection of West County Road 150 and Farm to Market Road 1788.  Two local news stations (KMID and KWES) went off the air due to satellite dish problems. At the Commemorative Air Force headquarters, a 75-by-25 foot section of the hangar's roof was ripped open and one ticket booth was destroyed.

Thunderstorm Wind in REEVES, TEXAS
From 27-JUN-07 00:23:00 to 27-JUN-07 00:23:00 (CST-6)
Location: PECOS
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A trained spotter estimated winds of 64 mph.  Trees and power lines were downed by strong winds.

Thunderstorm Wind in TERRELL, TEXAS
From 27-JUN-07 02:13:00 to 27-JUN-07 02:13:00 (CST-6)
Location: DRYDEN
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Automated Surface Observing Station at Dryden (K6R6) recorded a wind gust of 63 mph.  No damage was reported.

Thunderstorm Wind in WINKLER, TEXAS
From 26-JUN-07 22:37:00 to 26-JUN-07 22:45:00 (CST-6)
Location: (INK)WINKLER CO ARPT
Magnitude: 58.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: ASOS

The Automated Surface Observing Station at Wink (KINK) recorded a wind gust of 67 mph. A local media outlet reported downed powerlines and trees in Kermit. The roof at the Family Activity Center of the First Baptist Church in Kermit was severely damaged.

Thunderstorm Wind in ANDREWS, TEXAS
From 26-JUN-07 23:56:00 to 26-JUN-07 23:56:00 (CST-6)
Location: ANDREWS
Magnitude: 51.00 MG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Powerlines and trees were downed by strong winds. A roof was also blown off a building and onto powerlines.

Thunderstorm Wind in CULBERSON, TEXAS
From 26-JUN-07 22:51:00 to 27-JUN-07 01:00:00 (CST-6)
Location: (GDP)GUADALUPE PASS
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Automated Surface Observing System at Guadalupe Pass (KGDP) recorded several wind gusts over 60 mph over this time, including one to 73  mph.  No damage was reported.