Thunderstorms developed by mid afternoon in northwest Oklahoma near a warm front. A long-lived supercell became organized over Major County and moved southeast, leaving a swath of large damaging hail in its wake.
Baseball size hail was reported west of Fairview, with softball size hail west of Okeene. As the storm moved southeast, the coverage of hail increased, with numerous reports of golfball size - and a few baseball size - hail from near Kingfisher to northwest Oklahoma City. The storm continued southeast through Oklahoma City, causing extensive damage.
Damage was widespread and significant in and around the Oklahoma City metro area. Numerous vehicles were heavily damaged or even totaled by the large amounts of damaging hail. Numerous buildings suffered roof, window and structural damage, and trees and vegetation were shredded by the large hail. Hail drifts reached several feet deep over some areas, and a few locations reported hail still on the ground more than 12 hours later.
As the storm continued southeast, it continued to produce hail near golf ball size through parts of Seminole, Hughes, and Atoka counties.
While exact damage figures were not available, estimates place the monetary losses in excess of $500 million.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:08:00 to 16-MAY-10 15:08:00 (CST-6)
Location: NICHOLS HILLS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Both car and residence windows were broken from the large hail.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:00:00 to 16-MAY-10 15:00:00 (CST-6)
Location: WARR ACRES
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Several cars received significant damage from the large hail near NW 63rd Street and Portland Avenue.

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:05:00 to 16-MAY-10 15:05:00 (CST-6)
Location: OKLAHOMA CITY
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:00:00 to 16-MAY-10 15:00:00 (CST-6)
Location: NICHOLS HILLS
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail was reported near Western Avenue between Wilshire Boulevard and Britton Road.

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:12:00 to 16-MAY-10 15:12:00 (CST-6)
Location: THE VILLAGE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A few trees were uprooted, with power outages through the area as a result.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:13:00 to 16-MAY-10 15:13:00 (CST-6)
Location: OKLAHOMA CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BLAINE, OKLAHOMA
From 16-MAY-10 13:10:00 to 16-MAY-10 13:10:00 (CST-6)
Location: SOUTHARD
Magnitude: 56.00 EG
Property damage: 0.40K
Crop damage: 0.00K
Reported by: Emergency Manager

A couple of trees were uprooted as a result of the strong wind. Monetary damages were estimated.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:25:00 to 16-MAY-10 15:25:00 (CST-6)
Location: DEL CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail was reported near Eastern Avenue and SE 15th Street.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:07:00 to 16-MAY-10 15:07:00 (CST-6)
Location: OKLAHOMA CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:11:00 to 16-MAY-10 15:11:00 (CST-6)
Location: THE VILLAGE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MAJOR, OKLAHOMA
From 16-MAY-10 12:22:00 to 16-MAY-10 12:22:00 (CST-6)
Location: FAIRVIEW
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail report was relayed by KWTV-9.

Hail in BLAINE, OKLAHOMA
From 16-MAY-10 13:02:00 to 16-MAY-10 13:02:00 (CST-6)
Location: OKEENE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in COAL, OKLAHOMA
From 16-MAY-10 17:49:00 to 16-MAY-10 17:49:00 (CST-6)
Location: COALGATE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ATOKA, OKLAHOMA
From 16-MAY-10 18:24:00 to 16-MAY-10 18:24:00 (CST-6)
Location: DAISY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:50:00 to 16-MAY-10 14:50:00 (CST-6)
Location: THE VILLAGE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:53:00 to 16-MAY-10 14:53:00 (CST-6)
Location: EDMOND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:51:00 to 16-MAY-10 14:51:00 (CST-6)
Location: WARR ACRES
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:58:00 to 16-MAY-10 14:58:00 (CST-6)
Location: OKLAHOMA CITY
Magnitude: 4.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:39:00 to 16-MAY-10 14:39:00 (CST-6)
Location: EDMOND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:48:00 to 16-MAY-10 14:48:00 (CST-6)
Location: EDMOND
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail was reported on Edmond Road between May and Portland Avenues.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:50:00 to 16-MAY-10 14:50:00 (CST-6)
Location: THE VILLAGE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The hail was reported near Meridian Avenue and 164th Street.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:45:00 to 16-MAY-10 14:45:00 (CST-6)
Location: WARR ACRES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in KINGFISHER, OKLAHOMA
From 16-MAY-10 13:38:00 to 16-MAY-10 13:38:00 (CST-6)
Location: LOYAL
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CANADIAN, OKLAHOMA
From 16-MAY-10 14:32:00 to 16-MAY-10 14:33:00 (CST-6)
Location: PIEDMONT
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BLAINE, OKLAHOMA
From 16-MAY-10 12:58:00 to 16-MAY-10 12:58:00 (CST-6)
Location: OKEENE
Magnitude: 4.25 
Reported by: Law Enforcement

The hail report was relayed by KWTV-9. Also, the area wheat crop sustained major damage, with some fields totally wiped out. Monetary damage estimates were not available.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:25:00 to 16-MAY-10 15:25:00 (CST-6)
Location: FOREST PARK
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:38:00 to 16-MAY-10 15:38:00 (CST-6)
Location: (TIK)TINKER AFB
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in KINGFISHER, OKLAHOMA
From 16-MAY-10 13:30:00 to 16-MAY-10 14:05:00 (CST-6)
Location: LOYAL
Magnitude: 1.75 
Reported by: Emergency Manager

Hail up to golf ball size was reported to a large area. The emergency manager reported widespread damage to 20,000 acres of the wheat crop from north of Loyal to north of Okarche. Some canola fields were also damaged. Some farmers lost their entire wheat crop. Widespread damage to homes and businesses also occurred, mainly in the form of damaged siding and roofs. Monetary damage estimates were not available.

Hail in PONTOTOC, OKLAHOMA
From 16-MAY-10 17:13:00 to 16-MAY-10 17:18:00 (CST-6)
Location: ALLEN
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CUSTER, OKLAHOMA
From 16-MAY-10 17:27:00 to 16-MAY-10 17:27:00 (CST-6)
Location: CUSTER CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WOODS, OKLAHOMA
From 16-MAY-10 19:26:00 to 16-MAY-10 19:26:00 (CST-6)
Location: CAMP HOUSTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:30:00 to 16-MAY-10 15:30:00 (CST-6)
Location: CHOCTAW
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail was reported near SE 10th Street and Choctaw Rd.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:39:00 to 16-MAY-10 15:39:00 (CST-6)
Location: NICOMA PARK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:50:00 to 16-MAY-10 14:50:00 (CST-6)
Location: THE VILLAGE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Some homes had broken windows on the north sides of the structure. Numerous vehicles suffered significant damage. The winds were estimated at 50 mph.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:06:00 to 16-MAY-10 15:06:00 (CST-6)
Location: FOREST PARK
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Very large hail broke street lights near Remington Park.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:28:00 to 16-MAY-10 15:28:00 (CST-6)
Location: (TIK)TINKER AFB
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Hail in POTTAWATOMIE, OKLAHOMA
From 16-MAY-10 15:53:00 to 16-MAY-10 15:53:00 (CST-6)
Location: DALE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail was reported a half of a mile northwest of Shawnee Twin Lakes.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 14:55:00 to 16-MAY-10 15:00:00 (CST-6)
Location: THE VILLAGE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail was reported near Lake Hefner. Several people sustained minor injuries after being caught outside during the hailstorm.

Hail in CLEVELAND, OKLAHOMA
From 16-MAY-10 15:50:00 to 16-MAY-10 15:50:00 (CST-6)
Location: STELLA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Several cars had their windshields cracked because of the large hail.

Hail in POTTAWATOMIE, OKLAHOMA
From 16-MAY-10 16:10:00 to 16-MAY-10 16:10:00 (CST-6)
Location: SHAWNEE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:18:00 to 16-MAY-10 15:18:00 (CST-6)
Location: OKLAHOMA CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:29:00 to 16-MAY-10 15:29:00 (CST-6)
Location: MIDWEST CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail was reported near the intersection of Reno Avenue and Douglas Boulevard.

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:30:00 to 16-MAY-10 15:30:00 (CST-6)
Location: (TIK)TINKER AFB
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:10:00 to 16-MAY-10 15:10:00 (CST-6)
Location: EDMOND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

The hail was reported near the intersection of the Kilpatrick Turnpike and the Broadway Extension.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:24:00 to 16-MAY-10 15:24:00 (CST-6)
Location: DEL CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail was reported near Sunnylane Avenue and SE 15th Street.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:00:00 to 16-MAY-10 15:15:00 (CST-6)
Location: BETHANY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The hail occurred near Council Road and NW 23rd Street.

Hail in OKLAHOMA, OKLAHOMA
From 16-MAY-10 15:06:00 to 16-MAY-10 15:06:00 (CST-6)
Location: NICHOLS HILLS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio