An upper level storm system moved slowly into south central Colorado during the afternoon. A dry line had become established and was located along the Oklahoma and Texas panhandle border. Also, favorable upper level winds were rotating around the upper level storm system, crossing the dryline over western Oklahoma. As the afternoon progressed, convergence along the dryline became maximized over this area. Thunderstorms developed during the afternoon hours and they quickly became supercells.  Two of the supercells produced several tornadoes.  The northern tornadic storm produced five tornadoes from southwest of Roll to just east of Arnett.  The southern tornadic storm also produced five tornadoes in Oklahoma from near Sweetwater to near Sharon. Large hail was also observed. The supercells moved northeast out of Oklahoma during the late evening hours. Monetary values for the tornado damage were estimated.

Tornado in ROGER MILLS, OKLAHOMA
From 05-MAY-07 19:16:00 to 05-MAY-07 19:19:00 (CST-6)
Location: CRAWFORD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chasers observed a third tornado from the northern tornadic supercell that developed just south of the Canadian River in northern Roger Mills County, about 4 miles north of Crawford.  The tornado moved north-northeast and crossed into Ellis County. No damage was reported along the path of this tornado.

Hail in WOODWARD, OKLAHOMA
From 05-MAY-07 22:00:00 to 05-MAY-07 22:00:00 (CST-6)
Location: SHARON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in BECKHAM, OKLAHOMA
From 05-MAY-07 19:04:00 to 05-MAY-07 19:12:00 (CST-6)
Location: ERICK
Tornado F-scale: EF3
Property damage: 5.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

This is the first tornado that occurred in Oklahoma with the southern tornadic supercell.  The tornado appears to have developed 1/2 mile north of E1130 road and along Highway 30 in northern Beckham County, about 2 1/2 miles south of Sweetwater. The first evidence of a tornado was damage to an outbuilding at a gas facility on the west side of the highway along with some tree damage. The tornado moved north along and parallel to Highway 30, damaging trees, homes and some outbuildings. Damage in this area was mainly in the EF0 range.
The most significant damage occurred when the tornado struck the Sweetwater school. At this location, the tornado is estimated to have been 100-150 yards wide. The most significant damage was to a metal building that was the school`s multi-purpose building, which was almost completely destroyed. The anchoring that connected the building to the foundation appeared to have failed, allowing all but the most northern section of the building to collapse. A small building that connected this building with the school`s gymnasium suffered only slight damage. The gymnasium, at the northwest corner of the school, suffered substantial roof damage, which appeared to have caused the west masonry wall of the school to collapse outward.
Other damage on the school property consisted of a small storage building of similar construction as the multi-purpose building being completely destroyed, a bus barn/garage structure suffering damage when the large garage doors blew inward, and damage to trees, power lines and fences.
A pick up truck, which had been parked in the school`s parking lot, was rolled/tossed approximately 100 yards to the north. A horse trailer that had been near the storage building at the southwest edge of the school property was found more than one quarter mile away in a field.
A man suffered minor injuries near this location.
Just north of the school, a home was damaged and an oil storage facility was also hit. An oil tank from this location was found approximately 500 yards away.
Several animals were killed when a garage was destroyed. A RV was also destroyed. Numerous cars and school buses were damaged/destroyed.
The damage to the multi-purpose building at the Sweetwater school is consistent with damage at the low end of the EF-3 scale. The remainder of the damage was primarily in the EF0-EF1 category.
The tornado continued and crossed into Roger Mills County. Monetary damages were estimated.

Tornado in ROGER MILLS, OKLAHOMA
From 05-MAY-07 19:32:00 to 05-MAY-07 19:51:00 (CST-6)
Location: DEMPSEY
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

This is the second Oklahoma tornado from the southern tornadic supercell. A church about one mile suffered minor damage about 1 mile north of Dempsey.  Three outbuildings were destroyed near Dempsey.  Trees, fences and utility poles were destroyed along the entire path of the tornado.

Tornado in ELLIS, OKLAHOMA
From 05-MAY-07 19:56:00 to 05-MAY-07 20:07:00 (CST-6)
Location: ARNETT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management officials and storm chasers reported a tornado developed southeast of Arnett, and moved north.  The tornado crossed U.S. Highway 60 about 2 miles east of Arnett.  This is the fifth and final tornado associated with the northern tornadic supercell.

Tornado in ELLIS, OKLAHOMA
From 05-MAY-07 19:39:00 to 05-MAY-07 19:39:00 (CST-6)
Location: ARNETT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management officials reported a tornado touched down briefly about 10 miles south-southeast of Arnett.  This tornado caused no known damage.  This was the fourth tornado associated with the northern tornadic supercell.

Tornado in ROGER MILLS, OKLAHOMA
From 05-MAY-07 20:05:00 to 05-MAY-07 20:28:00 (CST-6)
Location: ROLL
Tornado F-scale: EF1
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A third tornado from the southern tornadic supercell occurred from southwest of Roll that initially moved north-northwest, then curved northeast to the northwest of Roll.  A shed and well house were destroyed near the initial touchdown of the tornado about 6 miles southwest of Roll.    The tornado moved north-northeast on the north side of a creek valley and caused damage to trees and fences along the path.  A mobile home suffered minor damage and a barn was destroyed about 6 miles west-southwest of Roll as the tornado turned to a more northerly motion.  The tornado then turned to the northeast and caused major damage to an unoccupied house south-southwest of Roll, and another as it passed 2 to 2.5 miles west of Roll.  The last damage observed from this tornado was about 2.5 miles northwest of Roll where trees and fences were damaged.

Tornado in ROGER MILLS, OKLAHOMA
From 05-MAY-07 20:34:00 to 05-MAY-07 20:36:00 (CST-6)
Location: ROLL
Tornado F-scale: EF1
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tornado touched down in far northern Roger Mills county, and moved northeast crossing the Canadian River into Ellis County.  Some tree damage was noted about 4.5 miles north-northeast of Roll in Roger Mills County.  This is the fourth tornado in Oklahoma from the southern supercell. Monetary damages were estimated.

Hail in WOODWARD, OKLAHOMA
From 05-MAY-07 22:31:00 to 05-MAY-07 22:31:00 (CST-6)
Location: CURTIS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in WOODWARD, OKLAHOMA
From 05-MAY-07 22:25:00 to 05-MAY-07 22:25:00 (CST-6)
Location: SHARON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Tornado in ROGER MILLS, OKLAHOMA
From 05-MAY-07 19:12:00 to 05-MAY-07 19:26:00 (CST-6)
Location: SWEETWATER
Tornado F-scale: EF3
Property damage: 150.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This is a continuation of the tornado that began in northern Beckham about 2 1/2 miles south of Sweetwater.
The tornado continued to produce damage as it moved north along Highway 30 into Sweetwater. The church and post office were damaged...as were several outbuildings and businesses.
Damage continued for approximately 5 miles north of Sweetwater, with some substantial tree damage noted on the west side of Highway 30...and numerous power lines downed.
The tornado appeared to have dissipated just south of E1040 road in southern Roger Mills County. Monetary damages were estimated.

Thunderstorm Wind in WOODWARD, OKLAHOMA
From 05-MAY-07 19:00:00 to 05-MAY-07 19:00:00 (CST-6)
Location: WOODWARD
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in ELLIS, OKLAHOMA
From 05-MAY-07 19:19:00 to 05-MAY-07 19:33:00 (CST-6)
Location: ARNETT
Tornado F-scale: EF0
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Storm Chaser

This tornado developed in northern Roger Mills County 4 miles north of Dempsey and moved north-northeast crossing into Ellis County about 16 miles south of Arnett.  No damage was reported in this rural area of the county, although the tornado was reported as a wide tornado at times.  As the tornado approached U.S. Highway 283, it was reported to be a well-developed cone shaped tornado with occasional multiple vorticies.  Tree limbs were reported downed where it crossed U.S. Highway 283.  The tornado dissipated about a mile after crossing the highway. Monetary damages were estimated.

Tornado in ELLIS, OKLAHOMA
From 05-MAY-07 20:36:00 to 05-MAY-07 20:58:00 (CST-6)
Location: HARMON
Tornado F-scale: EF2
Property damage: 612.00K
Crop damage: 0.00K
Reported by: Emergency Manager

This tornado developed 4 miles north-northeast of Roll in northern Roger Mills County and crossed the Canadian River into southern Ellis County at 9:36 pm CDT. Two houses and two mobile homes were destroyed in the Packsaddle area of southern Ellis County to the east of US Highway 283 (about 18 miles south-southwest of Harmon), and a roof was removed from another mobile home.  At least one of these homes suffered a complete removal of the roof and some damage to the exterior walls. Several cars were damaged or destroyed, as well as trees and power lines. Monetary values were estimated.

Tornado in ELLIS, OKLAHOMA
From 05-MAY-07 21:50:00 to 05-MAY-07 21:51:00 (CST-6)
Location: HARMON
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A tornado developed in far southeastern Ellis County about 9 miles east-southeast of Harmon. It moved east-northeast into Dewey County near U.S. Highway 60 and eventually moved into Woodward County before it dissipated east-northeast of Sharon. There was no known damage in Ellis County. This was the beginning of the fifth and final tornado in Oklahoma from the southern tornadic supercell.

Hail in BECKHAM, OKLAHOMA
From 05-MAY-07 18:44:00 to 05-MAY-07 18:44:00 (CST-6)
Location: MAYFIELD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in HARPER, OKLAHOMA
From 05-MAY-07 17:12:00 to 05-MAY-07 17:12:00 (CST-6)
Location: LAVERNE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in BECKHAM, OKLAHOMA
From 05-MAY-07 18:54:00 to 05-MAY-07 18:54:00 (CST-6)
Location: MAYFIELD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in WOODWARD, OKLAHOMA
From 05-MAY-07 22:38:00 to 05-MAY-07 22:38:00 (CST-6)
Location: MOORELAND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in ROGER MILLS, OKLAHOMA
From 05-MAY-07 18:40:00 to 05-MAY-07 18:42:00 (CST-6)
Location: REYDON
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser reported a tornado with the northern tornadic supercell to the southwest of Roll and east-northeast of Reydon.  No damage was reported from this tornado.

Tornado in ROGER MILLS, OKLAHOMA
From 05-MAY-07 19:03:00 to 05-MAY-07 19:03:00 (CST-6)
Location: CRAWFORD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chasers reported a second tornado from the northern tornadic storm.  This tornado was brief and estimated to have occurred about a mile northeast of Dempsey.  No damage was reported.

Tornado in DEWEY, OKLAHOMA
From 05-MAY-07 21:51:00 to 05-MAY-07 21:55:00 (CST-6)
Location: VICI
Tornado F-scale: EF1
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

This is the continuation of the tornado that began in northeastern Ellis county. The tornado moved across the extreme northwest tip of Dewey county west and northwest of Vici before moving into Woodward County south of Sharon. The only reported damage in Dewey county was downed power lines. Monetary damages were estimated.

Tornado in WOODWARD, OKLAHOMA
From 05-MAY-07 21:55:00 to 05-MAY-07 22:30:00 (CST-6)
Location: SHARON
Tornado F-scale: EF2
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Emergency Manager

This tornado developed about 7.5 miles south of Sharon and moved northeast. Near the beginning of the tornado path, substantial damage was noted along EW 57 Road,  about two miles north of the county line, and about one mile west of Highway 34. At this location, much of the roof of a single story home was removed, an old rail car being used to store dry cement bags and animal feed was thrown and/or rolled about 140 feet south of the residence, trees and large limbs were snapped, and a pickup truck was moved about 80 feet.
Beyond this location, the tornado moved through very rural areas and damage was sparse through portion of the tornado's path. Damage to structures was again noted along a path beginning about 4 miles east of Sharon. In this area, a barn was destroyed and an outbuilding had its windows blown out. Further northeast along the path, more outbuildings were damaged, at least two barns were destroyed, a recreational vehicle was destroyed, and a semi trailer overturned. Several large trees were also downed as the tornado continued northeast before dissipating about 6 miles east northeast of Sharon, just south of Highway 183. In total, 56 utility poles were destroyed along the tornado's path.
Monetary damages were estimated.

Hail in HARPER, OKLAHOMA
From 05-MAY-07 13:00:00 to 05-MAY-07 13:00:00 (CST-6)
Location: LAVERNE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HARPER, OKLAHOMA
From 05-MAY-07 13:14:00 to 05-MAY-07 13:14:00 (CST-6)
Location: LAVERNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HARPER, OKLAHOMA
From 05-MAY-07 17:00:00 to 05-MAY-07 17:00:00 (CST-6)
Location: LAVERNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HARPER, OKLAHOMA
From 05-MAY-07 12:55:00 to 05-MAY-07 12:55:00 (CST-6)
Location: LAVERNE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer