A weak cold front slipped into northern Oklahoma during the early morning hours of the 8th. Meanwhile, a dry line sharpened up near the Oklahoma/Texas panhandle border. Gulf moisture streamed north, with low to middle 60 dew point temperatures in place by late afternoon to the east of the dry line. The cold front had become stationary, providing another focus for afternoon thunderstorms. The cap that was in place for much of the day, weakened sufficiently for thunderstorms to develop over the western third of Oklahoma. Instability and wind shear were already in place, and a weak upper level disturbance moved northeast from west Texas during peak heating hours. Supercell thunderstorms moved northeast, with very large hail to the size of baseballs and strong winds reported along their path. The most intense damage occurred at Ponca City, where a wind gust over 90 mph was measured.

Hail in KAY, OKLAHOMA
From 08-APR-11 18:10:00 to 08-APR-11 18:10:00 (CST-6)
Location: NEWKIRK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in NOBLE, OKLAHOMA
From 08-APR-11 18:14:00 to 08-APR-11 18:14:00 (CST-6)
Location: CERES
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ALFALFA, OKLAHOMA
From 08-APR-11 18:16:00 to 08-APR-11 18:16:00 (CST-6)
Location: JET
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MAJOR, OKLAHOMA
From 08-APR-11 18:20:00 to 08-APR-11 18:20:00 (CST-6)
Location: RINGWOOD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in ALFALFA, OKLAHOMA
From 08-APR-11 18:26:00 to 08-APR-11 18:26:00 (CST-6)
Location: GOLTRY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in ALFALFA, OKLAHOMA
From 08-APR-11 18:30:00 to 08-APR-11 18:30:00 (CST-6)
Location: CHEROKEE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in GRANT, OKLAHOMA
From 08-APR-11 19:57:00 to 08-APR-11 19:57:00 (CST-6)
Location: WAKITA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The hail was reported near the intersection of Highways 11 and 11A.

Hail in GRANT, OKLAHOMA
From 08-APR-11 20:11:00 to 08-APR-11 20:11:00 (CST-6)
Location: MEDFORD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The hail was reported near the intersection of Highways 11 and 81.

Hail in GRANT, OKLAHOMA
From 08-APR-11 20:13:00 to 08-APR-11 20:13:00 (CST-6)
Location: MEDFORD
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in KAY, OKLAHOMA
From 08-APR-11 21:00:00 to 08-APR-11 21:00:00 (CST-6)
Location: BRAMAN
Magnitude: 4.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The hail was reported in Sumpter.

Hail in KAY, OKLAHOMA
From 08-APR-11 21:00:00 to 08-APR-11 21:00:00 (CST-6)
Location: BRAMAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in KAY, OKLAHOMA
From 08-APR-11 21:55:00 to 08-APR-11 21:55:00 (CST-6)
Location: BLACKWELL
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The measured wind gust was reported at the Blackwell mesonet.

Hail in KAY, OKLAHOMA
From 08-APR-11 22:26:00 to 08-APR-11 22:26:00 (CST-6)
Location: TONKAWA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The hail occurred on Highway 60 at the Chikaskia River.

Hail in KAY, OKLAHOMA
From 08-APR-11 22:00:00 to 08-APR-11 22:00:00 (CST-6)
Location: PONCA CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail occurred in addition to the very strong winds.

Hail in KAY, OKLAHOMA
From 08-APR-11 17:44:00 to 08-APR-11 17:44:00 (CST-6)
Location: NEWKIRK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GARFIELD, OKLAHOMA
From 08-APR-11 16:49:00 to 08-APR-11 16:49:00 (CST-6)
Location: ENID
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in GARFIELD, OKLAHOMA
From 08-APR-11 16:46:00 to 08-APR-11 16:56:00 (CST-6)
Location: ENID
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in GARFIELD, OKLAHOMA
From 08-APR-11 16:58:00 to 08-APR-11 16:58:00 (CST-6)
Location: BRECKINRIDGE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GARFIELD, OKLAHOMA
From 08-APR-11 17:08:00 to 08-APR-11 17:08:00 (CST-6)
Location: BRECKINRIDGE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GARFIELD, OKLAHOMA
From 08-APR-11 17:14:00 to 08-APR-11 17:14:00 (CST-6)
Location: FAIRMONT
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in KAY, OKLAHOMA
From 08-APR-11 17:15:00 to 08-APR-11 17:15:00 (CST-6)
Location: NEWKIRK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in KAY, OKLAHOMA
From 08-APR-11 17:45:00 to 08-APR-11 17:45:00 (CST-6)
Location: NEWKIRK
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail up to two inches in diameter was reported.

Hail in NOBLE, OKLAHOMA
From 08-APR-11 17:45:00 to 08-APR-11 17:45:00 (CST-6)
Location: BILLINGS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MAJOR, OKLAHOMA
From 08-APR-11 17:50:00 to 08-APR-11 17:50:00 (CST-6)
Location: CLEO SPRINGS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in NOBLE, OKLAHOMA
From 08-APR-11 18:05:00 to 08-APR-11 18:05:00 (CST-6)
Location: RED ROCK
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

The hail was reported on I-35 due west of Red Rock.

Hail in ALFALFA, OKLAHOMA
From 08-APR-11 18:10:00 to 08-APR-11 18:10:00 (CST-6)
Location: HELENA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Thunderstorm Wind in KAY, OKLAHOMA
From 08-APR-11 22:02:00 to 08-APR-11 22:04:00 (CST-6)
Location: (PNC)PONCA CITY ARPT
Magnitude: 82.00 MG
Crop damage: 0.00K
Reported by: ASOS

A very strong rear-flank downdraft caused significant damage in and around Ponca City, with the most severe damage occurring on the west side of town. The Ponca City airport sustained extensive damage, with the roof peeled off of a hangar, and heavy damage done to several other buildings. Wind gusts here were measured at 59 and 94 mph. The Mid America Door Company building (80,000 sq. feet) was destroyed. Several other structures sustained various types of damage. Signs and light posts were blown down. Trees and power lines took a large hit, with a large part of Ponca City without power for several hours. The high winds combined with large hail damaged numerous vehicles. Monetary damage estimates were not available.

Hail in KAY, OKLAHOMA
From 08-APR-11 22:15:00 to 08-APR-11 22:15:00 (CST-6)
Location: BLACKWELL
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The largest hail occurred on the south side of town.

Hail in NOBLE, OKLAHOMA
From 08-APR-11 17:56:00 to 08-APR-11 17:56:00 (CST-6)
Location: BILLINGS
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in KAY, OKLAHOMA
From 08-APR-11 17:26:00 to 08-APR-11 17:26:00 (CST-6)
Location: BLACKWELL
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in KAY, OKLAHOMA
From 08-APR-11 17:30:00 to 08-APR-11 17:30:00 (CST-6)
Location: NEWKIRK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

No damage occurred with the severe wind.

Hail in NOBLE, OKLAHOMA
From 08-APR-11 17:40:00 to 08-APR-11 17:40:00 (CST-6)
Location: BILLINGS
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in GRANT, OKLAHOMA
From 08-APR-11 20:10:00 to 08-APR-11 20:10:00 (CST-6)
Location: MEDFORD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in ALFALFA, OKLAHOMA
From 08-APR-11 18:15:00 to 08-APR-11 18:15:00 (CST-6)
Location: JET
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A few power lines were downed by the severe winds. Monetary damages were estimated.

Hail in NOBLE, OKLAHOMA
From 08-APR-11 18:19:00 to 08-APR-11 18:19:00 (CST-6)
Location: CERES
Magnitude: 2.00 
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A windshield was busted out by the large hail. Monetary damages were estimated.