Two distinct areas of severe thunderstorms developed late on the afternoon of April 30. The first was a cluster of supercells that initiated near a warm front across southwest Kansas and northwest Oklahoma. Several reports of golfball size hail were received between 7:00pm and 9:00pm CDT in Woods and Alfalfa County. More significantly, several tornadoes occurred in the area from near Great Salt Plains Lake to Medford with the easternmost supercell in this cluster. Some minor damage was reported, and the Oklahoma Mesonet site 1 SW Medford recorded a gust to 84 mph near a tornado.
The second area of severe weather initially developed across the Texas Panhandle, but spread eastward into parts of western and central Oklahoma overnight. One supercell affected Harmon County between 9:00-10:30pm CDT, with reports of golfball size hail and a wind gust of 76 mph near Gould. A large complex moved across much of central Oklahoma between 10:00pm-1:00am. While a couple of 1.00 hail reports were received in Oklahoma City, the main impact was severe winds, with numerous reports received from Caddo, Canadian, Grady, and Oklahoma County.

Hail in WOODS, OKLAHOMA
From 30-APR-12 18:00:00 to 30-APR-12 18:00:00 (CST-6)
Location: ALVA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ALFALFA, OKLAHOMA
From 30-APR-12 18:55:00 to 30-APR-12 18:55:00 (CST-6)
Location: GREAT SALT PLAINS LAKE DAM
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 30-APR-12 23:00:00 to 30-APR-12 23:00:00 (CST-6)
Location: HARRAH
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A 3 foot diameter tree was blown down.

Thunderstorm Wind in KAY, OKLAHOMA
From 30-APR-12 21:30:00 to 30-APR-12 21:30:00 (CST-6)
Location: TONKAWA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several power poles and associated lines were blown down.

Hail in HARMON, OKLAHOMA
From 30-APR-12 21:30:00 to 30-APR-12 21:30:00 (CST-6)
Location: HOLLIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 30-APR-12 23:33:00 to 30-APR-12 23:33:00 (CST-6)
Location: CHOCTAW
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Power lines were blown down near the I-240 and I-40 junction.

Thunderstorm Wind in GRANT, OKLAHOMA
From 30-APR-12 20:10:00 to 30-APR-12 20:10:00 (CST-6)
Location: MEDFORD
Magnitude: 73.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The wind gust occurred as a tornado moved to the south of the site.

Flash Flood in KAY, OKLAHOMA
From 30-APR-12 22:12:00 to 30-APR-12 23:59:00 (CST-6)
Location: BRAMAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rainfall resulted in water five to seven inches deep across Main Street in Braman. Other city and rural streets were also under water.

Thunderstorm Wind in GRADY, OKLAHOMA
From 30-APR-12 22:25:00 to 30-APR-12 22:25:00 (CST-6)
Location: MINCO
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in GRADY, OKLAHOMA
From 30-APR-12 22:30:00 to 30-APR-12 22:30:00 (CST-6)
Location: MINCO
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in GRANT, OKLAHOMA
From 30-APR-12 20:15:00 to 30-APR-12 20:15:00 (CST-6)
Location: MEDFORD
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The wind occurred as a tornado moved southeast of the site.

High Wind in CANADIAN, OKLAHOMA
From 30-APR-12 21:35:00 to 30-APR-12 21:35:00 (CST-6)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The wind gust was measured 5 miles west-northwest of El Reno.

High Wind in KINGFISHER, OKLAHOMA
From 30-APR-12 21:33:00 to 30-APR-12 21:33:00 (CST-6)
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The high winds blew for about an hour 12 miles west-northwest of Okarche. Most of the non-thunderstorm wind gusts were between 40 and 50 mph. Small tree limbs were snapped and lawn furniture was blown around.

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 30-APR-12 22:33:00 to 30-APR-12 22:33:00 (CST-6)
Location: (OKC)WILL ROGERS APT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in GRANT, OKLAHOMA
From 30-APR-12 20:30:00 to 30-APR-12 20:30:00 (CST-6)
Location: MEDFORD
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in OKLAHOMA, OKLAHOMA
From 30-APR-12 23:00:00 to 30-APR-12 23:00:00 (CST-6)
Location: HARRAH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in POTTAWATOMIE, OKLAHOMA
From 30-APR-12 23:58:00 to 30-APR-12 23:58:00 (CST-6)
Location: EARLSBORO
Magnitude: 61.00 EG
Reported by: Emergency Manager

A few outbuildings were damaged after being moved 10 to 15 feet off of their foundation. An 8 inch diameter tree was also blown over.

Hail in HARMON, OKLAHOMA
From 30-APR-12 20:35:00 to 30-APR-12 20:35:00 (CST-6)
Location: VINSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in WOODS, OKLAHOMA
From 30-APR-12 19:35:00 to 30-APR-12 19:35:00 (CST-6)
Location: CAPRON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in KIOWA, OKLAHOMA
From 30-APR-12 20:20:00 to 30-APR-12 20:20:00 (CST-6)
Location: LONE WOLF
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in GRANT, OKLAHOMA
From 30-APR-12 20:10:00 to 30-APR-12 21:00:00 (CST-6)
Location: MEDFORD
Tornado F-scale: EF1
Reported by: Broadcast Media

Soon after one tornado dissipated just south of Medford, another tornado developed just southeast of Medford. This tornado moved north-northeast damaging hundreds of power poles east of Medford toward Deer Creek and heavily damaging the Hohmann substation west of Deer Creek. When the tornado reached a point to the northwest of Deer Creek, the tornado began to curve to the east-southeast passing just north of Deer Creek and dissipating 2 or 3 miles east of Deer Creek.  Near Deer Creek, the tornado damaged the valve of a 30000 gallon anhydrous ammonia tank causing a leak that could not be stopped for a few hours. Much of the path of this tornado is estimated since it moved primarily through farmland.

Hail in HARMON, OKLAHOMA
From 30-APR-12 20:45:00 to 30-APR-12 20:45:00 (CST-6)
Location: VINSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in GRANT, OKLAHOMA
From 30-APR-12 20:50:00 to 30-APR-12 20:50:00 (CST-6)
Location: MEDFORD
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in WOODS, OKLAHOMA
From 30-APR-12 17:55:00 to 30-APR-12 17:55:00 (CST-6)
Location: CAMP HOUSTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in GRANT, OKLAHOMA
From 30-APR-12 20:55:00 to 30-APR-12 20:55:00 (CST-6)
Location: MEDFORD
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in HARMON, OKLAHOMA
From 30-APR-12 20:58:00 to 30-APR-12 20:58:00 (CST-6)
Location: HOLLIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in GRANT, OKLAHOMA
From 30-APR-12 21:00:00 to 30-APR-12 21:00:00 (CST-6)
Location: MEDFORD
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in GRANT, OKLAHOMA
From 30-APR-12 21:05:00 to 30-APR-12 21:05:00 (CST-6)
Location: LAMONT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A few large trees were uprooted.

Hail in HARMON, OKLAHOMA
From 30-APR-12 21:10:00 to 30-APR-12 21:10:00 (CST-6)
Location: HOLLIS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in HARMON, OKLAHOMA
From 30-APR-12 21:10:00 to 30-APR-12 21:10:00 (CST-6)
Location: GOULD
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Tornado in KAY, OKLAHOMA
From 30-APR-12 21:07:00 to 30-APR-12 21:13:00 (CST-6)
Location: NARDIN
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were damaged near west and south of Nardin as a tornado moved from near state highway 11 and 164th Street south-southeast.

Thunderstorm Wind in CADDO, OKLAHOMA
From 30-APR-12 21:25:00 to 30-APR-12 21:25:00 (CST-6)
Location: FT COBB
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CADDO, OKLAHOMA
From 30-APR-12 21:30:00 to 30-APR-12 21:30:00 (CST-6)
Location: FT COBB
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in OKLAHOMA, OKLAHOMA
From 30-APR-12 22:52:00 to 30-APR-12 22:52:00 (CST-6)
Location: CHOCTAW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in KAY, OKLAHOMA
From 30-APR-12 21:40:00 to 30-APR-12 21:40:00 (CST-6)
Location: BLACKWELL
Magnitude: 56.00 EG
Reported by: Emergency Manager

Roof and outbuilding damage was reported near 29th Street and Coleman Road southwest of Blackwell.

Tornado in KAY, OKLAHOMA
From 30-APR-12 21:25:00 to 30-APR-12 21:38:00 (CST-6)
Location: NARDIN
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several outbuildings and one home were heavily damaged. Numerous large trees were also blown over.

Tornado in GRANT, OKLAHOMA
From 30-APR-12 19:13:00 to 30-APR-12 20:05:00 (CST-6)
Location: WAKITA
Tornado F-scale: EF1
Reported by: Storm Chaser

Numerous storm chasers observed this tornado at various times. The tornado initially developed around 1913 CST approximately 5 miles north of Nash and began moving east-northeast. After a general east-northeast course for about 6 miles, the tornado then began curving northeast and eventually moved north-northwest for the final 5 miles crossing state highway 11 about 8.5 miles west of Medford, then approaching Wakita from the southeast and dissipating approximately 2 miles south-southeast of town. Power lines were damaged, but no structural damage was reported despite the long path as the tornado primarily moved through farmland.

Tornado in ALFALFA, OKLAHOMA
From 30-APR-12 18:40:00 to 30-APR-12 18:57:00 (CST-6)
Location: JET
Tornado F-scale: EF0
Reported by: Emergency Manager

Alfalfa County Emergency Management and KFOR-TV reported a tornado that formed on the south side of the Great Salt Plains Lake and moved north across the lake. The only reported damage was to an outbuilding on the edge of the lake. The specific path was estimated.

Tornado in ALFALFA, OKLAHOMA
From 30-APR-12 18:34:00 to 30-APR-12 18:34:00 (CST-6)
Location: JET
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Alfalfa County emergency management and a KFOR-TV chaser reported a brief tornado, with no damage reported. The tornado was observed to be just south of U.S. Highway 64 approximately 2.5 miles west of Jet.

Tornado in GRANT, OKLAHOMA
From 30-APR-12 20:06:00 to 30-APR-12 20:10:00 (CST-6)
Location: MEDFORD
Tornado F-scale: EF1
Reported by: Broadcast Media

This tornado developed just southwest of the town of Medford and remained south of town. The mesonet site southwest of Medford measured a wind gust 84 mph. A large barn was destroyed southwest of Medford, with debris scattered across the property. Many roadways leading in and out of Medford were closed due to fallen trees and power poles/lines.

Tornado in GRANT, OKLAHOMA
From 30-APR-12 20:29:00 to 30-APR-12 20:50:00 (CST-6)
Location: NASH
Tornado F-scale: EF1
Reported by: Storm Chaser

Several large trees were uprooted near Pond Creek. No other damage was reported with the tornado.