A cold front moved slowly southeast before stalling near the I-44 corridor. A dry line stretched just ahead of the front, lying from near Lawton southward into northern Texas,  with warm, moist air present ahead of it. By early evening, thunderstorms had developed ahead of these boundaries, just south and east of the Oklahoma City metro area. Large hail was reported with several of the thunderstorms. The development of the low-level jet added to the already sufficient wind shear for supercell thunderstorms, but also aided the low-level rotation in some of the thunderstorms. A couple of short-lived tornadoes were reported over Garvin and McClain counties, with some damage reported. The storms continued to develop through the evening hours, with many of them moving over the same areas. The drought that was in place was helped by the welcome rainfall, although a few areas reported brief flash-flooding.

Hail in STEPHENS, OKLAHOMA
From 22-APR-11 21:13:00 to 22-APR-11 21:13:00 (CST-6)
Location: CORUM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in JEFFERSON, OKLAHOMA
From 22-APR-11 21:40:00 to 22-APR-11 21:40:00 (CST-6)
Location: WAURIKA LAKE DAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail was reported at Waurika Lake.

Hail in GARVIN, OKLAHOMA
From 22-APR-11 21:15:00 to 22-APR-11 21:15:00 (CST-6)
Location: WYNNEWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in POTTAWATOMIE, OKLAHOMA
From 22-APR-11 17:38:00 to 22-APR-11 17:38:00 (CST-6)
Location: DALE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail was reported at Bethel Acres.

Hail in POTTAWATOMIE, OKLAHOMA
From 22-APR-11 17:40:00 to 22-APR-11 17:40:00 (CST-6)
Location: TECUMSEH
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Hail in POTTAWATOMIE, OKLAHOMA
From 22-APR-11 17:40:00 to 22-APR-11 17:40:00 (CST-6)
Location: TECUMSEH
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Up to baseball-size hail was reported 2 miles south of State Highway 9 and 2 miles east of Highway 102.

Hail in PONTOTOC, OKLAHOMA
From 22-APR-11 22:15:00 to 22-APR-11 22:15:00 (CST-6)
Location: VANOSS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

In addition to the hail, wind gusts were estimated around 60 mph.

Hail in GARVIN, OKLAHOMA
From 22-APR-11 17:46:00 to 22-APR-11 17:46:00 (CST-6)
Location: PAOLI
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Flash Flood in COTTON, OKLAHOMA
From 22-APR-11 21:45:00 to 22-APR-11 23:45:00 (CST-6)
Location: WALTERS ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several roadways, including Highway 5 were under water due to very heavy rainfall. The roadways had to be closed for a short time as a result.

Hail in COMANCHE, OKLAHOMA
From 22-APR-11 22:30:00 to 22-APR-11 22:30:00 (CST-6)
Location: GERONIMO
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in POTTAWATOMIE, OKLAHOMA
From 22-APR-11 17:42:00 to 22-APR-11 17:42:00 (CST-6)
Location: PINK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in POTTAWATOMIE, OKLAHOMA
From 22-APR-11 17:50:00 to 22-APR-11 17:50:00 (CST-6)
Location: PINK
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in GARVIN, OKLAHOMA
From 22-APR-11 22:30:00 to 22-APR-11 22:30:00 (CST-6)
Location: PAOLI
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in JEFFERSON, OKLAHOMA
From 22-APR-11 18:15:00 to 22-APR-11 18:15:00 (CST-6)
Location: HASTINGS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GARVIN, OKLAHOMA
From 22-APR-11 18:39:00 to 22-APR-11 18:39:00 (CST-6)
Location: LINDSAY
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GARVIN, OKLAHOMA
From 22-APR-11 18:30:00 to 22-APR-11 18:30:00 (CST-6)
Location: LINDSAY
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCCLAIN, OKLAHOMA
From 22-APR-11 23:23:00 to 22-APR-11 23:23:00 (CST-6)
Location: BYARS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PONTOTOC, OKLAHOMA
From 22-APR-11 22:15:00 to 22-APR-11 22:15:00 (CST-6)
Location: VANOSS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

In addition to the estimated wind gust, hail up to half-dollar size was reported.

Hail in GRADY, OKLAHOMA
From 22-APR-11 20:10:00 to 22-APR-11 20:10:00 (CST-6)
Location: COX CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in STEPHENS, OKLAHOMA
From 22-APR-11 19:11:00 to 22-APR-11 19:11:00 (CST-6)
Location: BRAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in GARVIN, OKLAHOMA
From 22-APR-11 18:55:00 to 22-APR-11 18:55:00 (CST-6)
Location: LINDSAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STEPHENS, OKLAHOMA
From 22-APR-11 19:23:00 to 22-APR-11 19:23:00 (CST-6)
Location: BRAY
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in COTTON, OKLAHOMA
From 22-APR-11 19:45:00 to 22-APR-11 19:45:00 (CST-6)
Location: COOKIETOWN
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in COTTON, OKLAHOMA
From 22-APR-11 21:45:00 to 22-APR-11 21:45:00 (CST-6)
Location: COOKIETOWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in COAL, OKLAHOMA
From 22-APR-11 22:00:00 to 22-APR-11 22:00:00 (CST-6)
Location: COALGATE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in JEFFERSON, OKLAHOMA
From 22-APR-11 19:45:00 to 22-APR-11 19:45:00 (CST-6)
Location: RYAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GARVIN, OKLAHOMA
From 22-APR-11 20:09:00 to 22-APR-11 20:09:00 (CST-6)
Location: LINDSAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in COTTON, OKLAHOMA
From 22-APR-11 20:07:00 to 22-APR-11 20:07:00 (CST-6)
Location: COOKIETOWN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STEPHENS, OKLAHOMA
From 22-APR-11 20:13:00 to 22-APR-11 20:13:00 (CST-6)
Location: DUNCAN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in GARVIN, OKLAHOMA
From 22-APR-11 17:06:00 to 22-APR-11 17:06:00 (CST-6)
Location: MAYSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STEPHENS, OKLAHOMA
From 22-APR-11 20:09:00 to 22-APR-11 20:09:00 (CST-6)
Location: BRAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in MURRAY, OKLAHOMA
From 22-APR-11 20:20:00 to 22-APR-11 20:20:00 (CST-6)
Location: SULPHUR
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STEPHENS, OKLAHOMA
From 22-APR-11 20:20:00 to 22-APR-11 20:20:00 (CST-6)
Location: DUNCAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The hail was reported over the western side of town.

Hail in MCCLAIN, OKLAHOMA
From 22-APR-11 17:18:00 to 22-APR-11 17:18:00 (CST-6)
Location: PURCELL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail was reported near Highway 74.

Hail in COTTON, OKLAHOMA
From 22-APR-11 20:26:00 to 22-APR-11 20:26:00 (CST-6)
Location: WALTERS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in COTTON, OKLAHOMA
From 22-APR-11 20:22:00 to 22-APR-11 20:22:00 (CST-6)
Location: WALTERS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in POTTAWATOMIE, OKLAHOMA
From 22-APR-11 17:15:00 to 22-APR-11 17:15:00 (CST-6)
Location: TECUMSEH
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GARVIN, OKLAHOMA
From 22-APR-11 17:21:00 to 22-APR-11 17:21:00 (CST-6)
Location: PAOLI
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in GARVIN, OKLAHOMA
From 22-APR-11 20:36:00 to 22-APR-11 20:36:00 (CST-6)
Location: ELMORE CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in COTTON, OKLAHOMA
From 22-APR-11 20:30:00 to 22-APR-11 20:30:00 (CST-6)
Location: WALTERS
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STEPHENS, OKLAHOMA
From 22-APR-11 20:36:00 to 22-APR-11 20:36:00 (CST-6)
Location: CORUM
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in COTTON, OKLAHOMA
From 22-APR-11 22:01:00 to 22-APR-11 22:01:00 (CST-6)
Location: WALTERS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STEPHENS, OKLAHOMA
From 22-APR-11 23:40:00 to 22-APR-11 23:40:00 (CST-6)
Location: MARLOW
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail was reported on 8-Mile Road west of Central High.

Hail in LINCOLN, OKLAHOMA
From 22-APR-11 16:45:00 to 22-APR-11 16:45:00 (CST-6)
Location: PRAGUE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in POTTAWATOMIE, OKLAHOMA
From 22-APR-11 18:04:00 to 22-APR-11 18:04:00 (CST-6)
Location: TECUMSEH
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in MCCLAIN, OKLAHOMA
From 22-APR-11 18:45:00 to 22-APR-11 18:48:00 (CST-6)
Location: BYARS
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous storm chasers observed a tornado just to the west-southwest of Byars. However, no known damage was reported with this tornado.

Tornado in GARVIN, OKLAHOMA
From 22-APR-11 19:02:00 to 22-APR-11 19:05:00 (CST-6)
Location: STRATFORD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Numerous storm chasers reported a tornado between Byars and Stratford. No damage was reported with this tornado.

Hail in JEFFERSON, OKLAHOMA
From 22-APR-11 18:10:00 to 22-APR-11 18:10:00 (CST-6)
Location: HASTINGS
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

A sun roof on a residential structure was damaged. Monetary damages were estimated.

Hail in GRADY, OKLAHOMA
From 22-APR-11 18:55:00 to 22-APR-11 19:35:00 (CST-6)
Location: COX CITY
Magnitude: 2.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Up to baseball-size hail occurred off and on from 1855 to 1935 cst. Minor roof damage was reported. Monetary damages were estimated.

Thunderstorm Wind in GARVIN, OKLAHOMA
From 22-APR-11 19:28:00 to 22-APR-11 19:28:00 (CST-6)
Location: STRATFORD
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A telephone pole was downed and a tractor trailer was overturned. Monetary damages were estimated.

Tornado in MCCLAIN, OKLAHOMA
From 22-APR-11 18:59:00 to 22-APR-11 18:59:00 (CST-6)
Location: BYARS
Tornado F-scale: EF1
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Numerous chasers observed a tornado near state highway 59 to the east of Byars.  An outbuilding was damaged by this tornado. Several trees were downed. A downed power line caused the town to be without power for several hours. Monetary damages were estimated.

Hail in COTTON, OKLAHOMA
From 22-APR-11 20:05:00 to 22-APR-11 20:05:00 (CST-6)
Location: WALTERS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio