Severe thunderstorms affected most of central and eastern Oklahoma on the 20th. More than a dozen tornadoes were confirmed, with four occurring in the Norman Forecast Area. See Tulsa storm data for information on eastern Oklahoma tornadoes. Little damage from straight-line winds was reported, however there was a large amount of large hail.

Hail in GRADY, OKLAHOMA
From 20-MAY-01 17:29:00 to 20-MAY-01 17:29:00 (CST)
Location: POCASSET
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in CANADIAN, OKLAHOMA
From 20-MAY-01 17:07:00 to 20-MAY-01 17:07:00 (CST)
Location: MUSTANG
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in PONTOTOC, OKLAHOMA
From 20-MAY-01 17:18:00 to 20-MAY-01 17:18:00 (CST)
Location: VANOSS
Magnitude: 1.75 
Reported by: EMERGENCY MANAGER

Hail in PONTOTOC, OKLAHOMA
From 20-MAY-01 17:38:00 to 20-MAY-01 17:38:00 (CST)
Location: BYNG
Magnitude: 1.00 
Reported by: FIRE DEPT/RESCUE SQUAD

Hail in SEMINOLE, OKLAHOMA
From 20-MAY-01 17:43:00 to 20-MAY-01 17:43:00 (CST)
Location: KONAWA
Magnitude: 1.75 
Reported by: AMATEUR RADIO

Hail in GARFIELD, OKLAHOMA
From 20-MAY-01 16:01:00 to 20-MAY-01 16:01:00 (CST)
Location: FAIRMONT
Magnitude: 0.88 
Reported by: AMATEUR RADIO

Hail in PONTOTOC, OKLAHOMA
From 20-MAY-01 18:39:00 to 20-MAY-01 18:39:00 (CST)
Location: LULA
Magnitude: 2.75 
Reported by: NWS EMPLOYEE(OFF DUTY)

Thunderstorm Wind in PONTOTOC, OKLAHOMA
From 20-MAY-01 18:39:00 to 20-MAY-01 18:39:00 (CST)
Location: LULA
Property damage: .01K
Reported by: NWS EMPLOYEE(OFF DUTY)

Eight-inch diameter tree limbs were downed.

Hail in ATOKA, OKLAHOMA
From 20-MAY-01 19:00:00 to 20-MAY-01 19:00:00 (CST)
Location: WARDVILLE
Magnitude: 2.75 
Property damage: 1K
Reported by: POST OFFICE

Car windows were broken.

Hail in COAL, OKLAHOMA
From 20-MAY-01 23:05:00 to 20-MAY-01 23:05:00 (CST)
Location: TUPELO
Magnitude: 1.75 
Reported by: LAW ENFORCEMENT

Hail in KAY, OKLAHOMA
From 20-MAY-01 15:25:00 to 20-MAY-01 15:25:00 (CST)
Location: PONCA CITY
Magnitude: 1.75 
Reported by: EMERGENCY MANAGER

Hail in SEMINOLE, OKLAHOMA
From 20-MAY-01 15:30:00 to 20-MAY-01 15:30:00 (CST)
Location: WEWOKA
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Hail in GARFIELD, OKLAHOMA
From 20-MAY-01 15:58:00 to 20-MAY-01 15:58:00 (CST)
Location: WAUKOMIS
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in COAL, OKLAHOMA
From 20-MAY-01 18:18:00 to 20-MAY-01 18:18:00 (CST)
Location: TUPELO
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Hail in PONTOTOC, OKLAHOMA
From 20-MAY-01 18:30:00 to 20-MAY-01 18:30:00 (CST)
Location: LULA
Magnitude: 1.25 
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in COAL, OKLAHOMA
From 20-MAY-01 23:30:00 to 20-MAY-01 23:30:00 (CST)
Location: TUPELO
Magnitude: 1.50 
Reported by: LAW ENFORCEMENT

Hail in SEMINOLE, OKLAHOMA
From 20-MAY-01 15:10:00 to 20-MAY-01 15:10:00 (CST)
Location: SEMINOLE
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Hail in HUGHES, OKLAHOMA
From 20-MAY-01 15:15:00 to 20-MAY-01 15:15:00 (CST)
Location: WETUMKA
Magnitude: 0.75 
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in SEMINOLE, OKLAHOMA
From 20-MAY-01 17:46:00 to 20-MAY-01 17:46:00 (CST)
Location: SASAKWA
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Hail in PONTOTOC, OKLAHOMA
From 20-MAY-01 18:00:00 to 20-MAY-01 18:00:00 (CST)
Location: ADA
Magnitude: 1.75 
Reported by: AMATEUR RADIO

Hail in DEWEY, OKLAHOMA
From 20-MAY-01 14:58:00 to 20-MAY-01 14:58:00 (CST)
Location: OAKWOOD
Magnitude: 1.00 
Reported by: LAW ENFORCEMENT

Hail in POTTAWATOMIE, OKLAHOMA
From 20-MAY-01 15:00:00 to 20-MAY-01 15:00:00 (CST)
Location: HARJO
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in BLAINE, OKLAHOMA
From 20-MAY-01 15:05:00 to 20-MAY-01 15:05:00 (CST)
Location: WATONGA
Magnitude: 0.88 
Reported by: LAW ENFORCEMENT

Tornado in HUGHES, OKLAHOMA
From 20-MAY-01 15:20:00 to 20-MAY-01 15:50:00 (CST)
Location: DUSTIN
Tornado F-scale: F2
Property damage: 175K
Reported by: STORM CHASER

A damage survey conducted by National Severe Storms Laboratory meteorologists confirmed F2 damage approximately 6 miles southwest of Dustin, when 80 percent of a house roof was blown off. As the tornado moved east-northeast sporadic roof damage was sustained to other homes; an antenna was wrapped around a telephone pole; trees were damaged; farm buildings were destroyed; power poles were bent, and two feeders were bent up. The tornado then tracked into McIntosh County. See storm data from the National Weather Service Office in Tulsa for more information on the McIntosh County segment of this tornado. Eye witnesses described the tornado as multiple-vortex.

Tornado in COAL, OKLAHOMA
From 20-MAY-01 18:40:00 to 20-MAY-01 18:41:00 (CST)
Location: CENTRAHOMA
Tornado F-scale: F0
Property damage: 0
Reported by: STORM CHASER

This brief, multiple-vortex tornado formed just west of Highway 75, approximately five miles northeast of Centrahoma. The tornado dissipated after 30 to 45 seconds and resulted in no damage.

Hail in CANADIAN, OKLAHOMA
From 20-MAY-01 16:55:00 to 20-MAY-01 16:55:00 (CST)
Location: UNION CITY
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Hail in GRADY, OKLAHOMA
From 20-MAY-01 17:00:00 to 20-MAY-01 17:00:00 (CST)
Location: MINCO
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in CANADIAN, OKLAHOMA
From 20-MAY-01 16:00:00 to 20-MAY-01 16:00:00 (CST)
Location: SCOTT
Magnitude: 1.00 
Reported by: GENERAL PUBLIC

Tornado in PONTOTOC, OKLAHOMA
From 20-MAY-01 17:51:00 to 20-MAY-01 17:51:00 (CST)
Location: ADA
Tornado F-scale: F0
Property damage: 0
Reported by: STORM CHASER

This tornado was reported by two persons, seven miles south of Ada. Its duration was very brief, and no damage was reported.

Funnel Cloud in PONTOTOC, OKLAHOMA
From 20-MAY-01 17:56:00 to 20-MAY-01 17:56:00 (CST)
Location: ADA
Reported by: STORM CHASER

Tornado in COAL, OKLAHOMA
From 20-MAY-01 18:15:00 to 20-MAY-01 18:15:00 (CST)
Location: TUPELO
Tornado F-scale: F0
Property damage: 0
Reported by: BROADCAST MEDIA

This brief tornado was captured on video but produced no damage.

Hail in HUGHES, OKLAHOMA
From 20-MAY-01 16:15:00 to 20-MAY-01 16:15:00 (CST)
Location: DUSTIN
Magnitude: 1.75 
Reported by: FIRE DEPT/RESCUE SQUAD

Hail in GARFIELD, OKLAHOMA
From 20-MAY-01 16:31:00 to 20-MAY-01 16:31:00 (CST)
Location: GARBER
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in CANADIAN, OKLAHOMA
From 20-MAY-01 16:47:00 to 20-MAY-01 16:47:00 (CST)
Location: UNION CITY
Magnitude: 0.88 
Reported by: AMATEUR RADIO

Hail in CANADIAN, OKLAHOMA
From 20-MAY-01 16:50:00 to 20-MAY-01 16:50:00 (CST)
Location: UNION CITY
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Hail in KAY, OKLAHOMA
From 20-MAY-01 15:32:00 to 20-MAY-01 15:32:00 (CST)
Location: PONCA CITY
Magnitude: 1.25 
Reported by: STORM CHASER

Hail in ATOKA, OKLAHOMA
From 20-MAY-01 19:05:00 to 20-MAY-01 19:05:00 (CST)
Location: WARDVILLE
Magnitude: 1.00 
Reported by: LAW ENFORCEMENT

Hail in SEMINOLE, OKLAHOMA
From 20-MAY-01 16:13:00 to 20-MAY-01 16:13:00 (CST)
Location: SASAKWA
Magnitude: 0.88 
Reported by: GENERAL PUBLIC