A potent Spring storm system took shape across the Southern and Central Plains. Strong surface cyclogenesis took shape during the day, allowing ample moisture to return northward with strong southerly flow. At the same time, a strong upper level shortwave trough allowed strong mid level westerlies to overspread much of the Plains region. With large instability and wind shear, the stage was set for widespread severe storm development. Storms initiated within the open warm sector ahead of the dryline. The first storm developed near Lawton and moved northeast along I-44 into parts of central Oklahoma, resulting in several tornadoes and large hail. Additional supercells spawned tornadoes across northern Oklahoma, and the slow moving nature of storms lead to several occurrences of flash flooding. Storms continued well into the night.

Flash Flood in CLEVELAND, OKLAHOMA
From 06-MAY-15 17:56:00 to 06-MAY-15 18:56:00 (CST-6)
Location: MOORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High water beneath railroad overpass made 19th street impassable.

Tornado in CADDO, OKLAHOMA
From 06-MAY-15 13:53:00 to 06-MAY-15 13:55:00 (CST-6)
Location: CYRIL
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Live coverage from Oklahoma City television stations showed a tornado develop approximately 4 miles northwest of Cyril. No damage was reported.

Tornado in GRADY, OKLAHOMA
From 06-MAY-15 15:33:00 to 06-MAY-15 16:26:00 (CST-6)
Location: AMBER
Tornado F-scale: EF3
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A large tornado developed east of Amber and moved slowly northeast near or along Interstate 44, then turned north impacting the community of Bridge Creek. The most intense damage occurred just east of the Interstate 44 and H.E. Bailey Turnpike Spur near Bridge Creek where EF3 damage was observed to a home (DI 2, DOD 7) and a mobile home (DI 4, DOD 12). A pickup truck was also thrown for several hundred yards in this area. Numerous homes and other buildings were damaged along the tornado path.

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 06-MAY-15 17:00:00 to 06-MAY-15 17:00:00 (CST-6)
Location: (OUN)NORMAN WESTHEIMER ARPT
Magnitude: 65.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Straight lined wind damage associated with a rear flank downdraft damaged the facade of a hotel along interstate 35.

Hail in GRADY, OKLAHOMA
From 06-MAY-15 19:02:00 to 06-MAY-15 19:02:00 (CST-6)
Location: MINCO
Magnitude: 1.50 
Reported by: Emergency Manager

No damage was reported.

Thunderstorm Wind in GRADY, OKLAHOMA
From 06-MAY-15 19:15:00 to 06-MAY-15 19:15:00 (CST-6)
Location: BRIDGE CREEK
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Several trees snapped or uprooted.

Thunderstorm Wind in GRADY, OKLAHOMA
From 06-MAY-15 19:17:00 to 06-MAY-15 19:17:00 (CST-6)
Location: TUTTLE
Magnitude: 71.00 MG
Reported by: Trained Spotter

Severe winds up to 82 mph measured with half dollar sized hail. No damage information was available.

Tornado in CLEVELAND, OKLAHOMA
From 06-MAY-15 16:53:00 to 06-MAY-15 17:10:00 (CST-6)
Location: (OUN)NORMAN WESTHEIMER ARPT
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado developed south of 36th Avenue NW and Rock Creek Road and traveled basically north near 36th Avenue to near Indian Hills Road through the northwest side of Norman. Numerous house roofs, trees, fences and power poles were damaged in the neighborhoods along 36th Avenue. HVAC equipment was damaged and light poles were downed at the Norman Healthplex hospital at 36th Avenue NW and Tecumseh Road.

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 06-MAY-15 13:18:00 to 06-MAY-15 13:18:00 (CST-6)
Location: LAKE ELLSWORTH DAM
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Several trees snapped.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 06-MAY-15 13:30:00 to 06-MAY-15 13:30:00 (CST-6)
Location: LOCO
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Several trees snapped or uprooted.

Tornado in GRADY, OKLAHOMA
From 06-MAY-15 19:11:00 to 06-MAY-15 19:21:00 (CST-6)
Location: TUTTLE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Videos from storm chasers and an NWS damage survey indicate a tornado developed about 4 miles east-northeast of Tuttle and moved southeast then east to about 2 miles northeast of Bridge Creek. Observed damage was confined to trees along the path. The end of the path likely overlapped with the north end of the damage path of the Bridge Creek tornado from earlier in the day.

Hail in CLEVELAND, OKLAHOMA
From 06-MAY-15 20:15:00 to 06-MAY-15 20:15:00 (CST-6)
Location: NORMAN
Magnitude: 1.50 
Reported by: Trained Spotter

No damage was reported.

Hail in CLEVELAND, OKLAHOMA
From 06-MAY-15 20:25:00 to 06-MAY-15 20:25:00 (CST-6)
Location: STANLEY DRAPER LAKE DAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 06-MAY-15 20:30:00 to 06-MAY-15 20:30:00 (CST-6)
Location: DEL CITY
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

A four foot diameter was snapped at the base and several power lines and poles were downed.

Hail in CADDO, OKLAHOMA
From 06-MAY-15 17:04:00 to 06-MAY-15 17:04:00 (CST-6)
Location: WASHITA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 06-MAY-15 17:10:00 to 06-MAY-15 17:10:00 (CST-6)
Location: (OUN)NORMAN WESTHEIMER ARPT
Magnitude: 50.00 MG
Reported by: Mesonet

No damage was reported.

Tornado in MAJOR, OKLAHOMA
From 06-MAY-15 15:37:00 to 06-MAY-15 15:38:00 (CST-6)
Location: RINGWOOD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous storm spotters and chasers reported a tornado briefly developed approximately 5 miles south of Ringwood. No damage was reported.

Tornado in GRADY, OKLAHOMA
From 06-MAY-15 15:48:00 to 06-MAY-15 15:48:00 (CST-6)
Location: AMBER
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A storm chaser with KFOR-TV observed a satellite tornado that occurred near the large tornado east of Amber. Any damage from this tornado would be indistinguishable from the damage path of the large tornado, and the location is estimated.

Hail in GRANT, OKLAHOMA
From 06-MAY-15 17:11:00 to 06-MAY-15 17:11:00 (CST-6)
Location: POND CREEK
Magnitude: 2.50 
Reported by: Trained Spotter

No damage was reported.

Hail in CANADIAN, OKLAHOMA
From 06-MAY-15 19:21:00 to 06-MAY-15 19:21:00 (CST-6)
Location: MUSTANG
Magnitude: 1.75 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Hail damaged roofs of homes and stripped leaves off of trees.

Flash Flood in CLEVELAND, OKLAHOMA
From 06-MAY-15 19:00:00 to 06-MAY-15 21:00:00 (CST-6)
Location: STANLEY DRAPER LAKE DAM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

One woman perished while seeking shelter from a tornado in a below ground storm cellar. Heavy rains flooded the cellar, and the woman drowned.

Tornado in GARFIELD, OKLAHOMA
From 06-MAY-15 16:15:00 to 06-MAY-15 16:15:00 (CST-6)
Location: CARRIER
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotters and chasers observed a brief tornado estimated to have occurred about 2 miles south-southwest of Carrier.

Hail in GRADY, OKLAHOMA
From 06-MAY-15 19:28:00 to 06-MAY-15 19:28:00 (CST-6)
Location: BRIDGE CREEK
Magnitude: 1.75 
Reported by: Trained Spotter

No damage was reported.

Thunderstorm Wind in GRADY, OKLAHOMA
From 06-MAY-15 19:48:00 to 06-MAY-15 19:48:00 (CST-6)
Location: TUTTLE
Magnitude: 66.00 MG
Reported by: Trained Spotter

No damage was reported.

Hail in CADDO, OKLAHOMA
From 06-MAY-15 14:05:00 to 06-MAY-15 14:05:00 (CST-6)
Location: STECKER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in CADDO, OKLAHOMA
From 06-MAY-15 13:45:00 to 06-MAY-15 13:45:00 (CST-6)
Location: APACHE
Magnitude: 56.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Public

Large tree limbs downed.

Flash Flood in MCCLAIN, OKLAHOMA
From 06-MAY-15 17:13:00 to 06-MAY-15 19:13:00 (CST-6)
Location: NEWCASTLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Water over several roads and flowing out of ditches along highway 62.

Flash Flood in OKLAHOMA, OKLAHOMA
From 06-MAY-15 18:12:00 to 06-MAY-15 20:12:00 (CST-6)
Location: (PWA)WILEY POST APT
Flood cause: Heavy Rain
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Vehicles stranded due to high water and excessive heavy rainfall.

Hail in GRADY, OKLAHOMA
From 06-MAY-15 14:12:00 to 06-MAY-15 14:12:00 (CST-6)
Location: LAVERTY
Magnitude: 2.00 
Reported by: Public

No damage was reported.

Thunderstorm Wind in GARFIELD, OKLAHOMA
From 06-MAY-15 17:15:00 to 06-MAY-15 17:15:00 (CST-6)
Location: HILLSDALE
Magnitude: 56.00 EG
Property damage: 40.00K
Reported by: Department of Highways

A trailer was flipped over by damaging straight line winds.

Hail in JACKSON, OKLAHOMA
From 06-MAY-15 17:30:00 to 06-MAY-15 17:30:00 (CST-6)
Location: ELMER
Magnitude: 2.75 
Reported by: Broadcast Media

No damage was reported.

Hail in GRADY, OKLAHOMA
From 06-MAY-15 17:30:00 to 06-MAY-15 17:30:00 (CST-6)
Location: TUTTLE
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Damage to several vehicles and siding on one home. Damages estimated.

Tornado in MCCLAIN, OKLAHOMA
From 06-MAY-15 16:33:00 to 06-MAY-15 16:39:00 (CST-6)
Location: NEWCASTLE
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Storm chasers observed a tornado in the southeast part of Newcastle. Aerial images indicated two outbuildings lost their roofs or were destroyed (DI 1, DOD 5).

Tornado in CLEVELAND, OKLAHOMA
From 06-MAY-15 16:46:00 to 06-MAY-15 16:47:00 (CST-6)
Location: (OUN)NORMAN WESTHEIMER ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An NWS storm survey found that a tornado touched down near 60th Avenue NW and Robinson Street in northwest Norman. Damage was observed to trees and fencing with damage direction indicating a small vortex. This area was embedded within a large swath of wind damage from the storm's rear-flank downdraft that extended from this area to near Max Westheimer Airport.

Hail in CLEVELAND, OKLAHOMA
From 06-MAY-15 20:00:00 to 06-MAY-15 20:00:00 (CST-6)
Location: NORMAN
Magnitude: 2.00 
Reported by: Trained Spotter

No damage was reported.

Hail in CLEVELAND, OKLAHOMA
From 06-MAY-15 20:00:00 to 06-MAY-15 20:00:00 (CST-6)
Location: NORMAN
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

No damage was reported.

Hail in CLEVELAND, OKLAHOMA
From 06-MAY-15 20:06:00 to 06-MAY-15 20:06:00 (CST-6)
Location: NORMAN
Magnitude: 1.75 
Reported by: Trained Spotter

No damage was reported.

Tornado in DEWEY, OKLAHOMA
From 06-MAY-15 17:33:00 to 06-MAY-15 17:33:00 (CST-6)
Location: SEILING
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A storm chaser with KOKH observed a tornado east-southeast of Seiling. No damage was reported and the location is estimated.

Flash Flood in OKLAHOMA, OKLAHOMA
From 06-MAY-15 18:52:00 to 06-MAY-15 20:52:00 (CST-6)
Location: WHEATLAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Over 3 inches of rain fell in one hour at Will Rogers World Airport in southwest Oklahoma City. This resulted in areas of flooding across southwestern portions of the Oklahoma City metro. No damage was reported.

Hail in CADDO, OKLAHOMA
From 06-MAY-15 14:16:00 to 06-MAY-15 14:16:00 (CST-6)
Location: ANADARKO
Magnitude: 1.50 
Reported by: Amateur Radio

No damage was reported.

Hail in GRADY, OKLAHOMA
From 06-MAY-15 14:23:00 to 06-MAY-15 14:23:00 (CST-6)
Location: VERDEN
Magnitude: 1.50 
Reported by: Storm Chaser

No damage was reported.

Hail in JACKSON, OKLAHOMA
From 06-MAY-15 17:51:00 to 06-MAY-15 17:51:00 (CST-6)
Location: HEADRICK
Magnitude: 2.50 
Reported by: Emergency Manager

No damage was reported.

Flash Flood in OKLAHOMA, OKLAHOMA
From 06-MAY-15 20:30:00 to 06-MAY-15 22:30:00 (CST-6)
Location: DEL CITY
Flood cause: Heavy Rain
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Public

At least one home and a business were flooded.

Tornado in CADDO, OKLAHOMA
From 06-MAY-15 13:45:00 to 06-MAY-15 13:47:00 (CST-6)
Location: APACHE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser observed a tornado develop approximately 2.5 miles east of Apache and move northeast to approximately 3 miles east-northeast of Apache. Trees were damaged, but no known structure damage occurred.

Hail in ALFALFA, OKLAHOMA
From 06-MAY-15 14:56:00 to 06-MAY-15 14:56:00 (CST-6)
Location: HELENA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in JACKSON, OKLAHOMA
From 06-MAY-15 18:45:00 to 06-MAY-15 18:45:00 (CST-6)
Location: HEADRICK
Magnitude: 1.25 
Reported by: Public

No damage was reported.

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 06-MAY-15 18:57:00 to 06-MAY-15 18:57:00 (CST-6)
Location: (OKC)WILL ROGERS APT
Magnitude: 52.00 MG
Reported by: ASOS

No damage was reported.

Tornado in OKLAHOMA, OKLAHOMA
From 06-MAY-15 19:41:00 to 06-MAY-15 19:48:00 (CST-6)
Location: VALLEY BROOK
Tornado F-scale: EF3
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down near Southeast 59th Street and Eastern Avenue in Oklahoma City, and moved north along Eastern Avenue, then northwest crossing Interstate 35 near and south of Southeast 44th Street before turning west and dissipating near Southeast 44th Street and Lindsay Avenue. The most significant damage occurred just east of Interstate 35 where a motel sustained significant damage losing most walls on the second floor (DI 6, DOD 8) and significant damage to many recreational vehicles at an adjacent RV park. While not directly related to the tornado, one woman perished while seeking shelter from the tornado in a below ground storm cellar. Heavy rains flooded the cellar, and the woman drowned.

Tornado in CADDO, OKLAHOMA
From 06-MAY-15 17:41:00 to 06-MAY-15 17:49:00 (CST-6)
Location: LAKE CHICKASHA DAM
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm spotters observed a tornado northwest and north of Verden and near and east of Lake Chickasha. The radar signature indicated that this tornado was likely a potentially significant tornado, however no damage was reported in this very rural area and the torando path is estimated.

Hail in GARFIELD, OKLAHOMA
From 06-MAY-15 16:46:00 to 06-MAY-15 16:46:00 (CST-6)
Location: HILLSDALE
Magnitude: 1.75 
Reported by: Emergency Manager

No damage was reported.

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 06-MAY-15 16:51:00 to 06-MAY-15 16:51:00 (CST-6)
Location: (OUN)NORMAN WESTHEIMER ARPT
Magnitude: 61.00 EG
Reported by: Trained Spotter

No damage was reported.

Tornado in GRANT, OKLAHOMA
From 06-MAY-15 17:56:00 to 06-MAY-15 17:57:00 (CST-6)
Location: WAKITA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser observed a brief tornado estimated to be approximately 5 miles south-southwest of Wakita. No known damage occurred.

Tornado in GRADY, OKLAHOMA
From 06-MAY-15 18:49:00 to 06-MAY-15 18:51:00 (CST-6)
Location: TUTTLE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Chaser video and an NWS storm survey indicated that a tornado touched down about 3 miles southeast of Tuttle and moved south-southeast. Trees were uprooted (DOD 27, DI 3) and two homes sustained minor damage (DOD 2, DI 2-4).