An outflow boundary and a dryline both led to numerous thunderstorms developing during the afternoon and evening of the 15th, with hail, wind, and a brief tornado reported.

Tornado in TILLMAN, OKLAHOMA
From 15-MAY-20 18:32:00 to 15-MAY-20 18:32:00 (CST-6)
Location: DAVIDSON
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser photographed a tornado east of Davidson. The specific location is estimated based on the spotter's location and viewing angle and radar. No damage was reported.

Hail in MCCLAIN, OKLAHOMA
From 15-MAY-20 13:17:00 to 15-MAY-20 13:17:00 (CST-6)
Location: BLANCHARD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in COMANCHE, OKLAHOMA
From 15-MAY-20 14:02:00 to 15-MAY-20 14:02:00 (CST-6)
Location: MEDICINE PARK
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COMANCHE, OKLAHOMA
From 15-MAY-20 14:02:00 to 15-MAY-20 14:02:00 (CST-6)
Location: ELGIN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Location estimated from radar.

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 15-MAY-20 14:07:00 to 15-MAY-20 14:07:00 (CST-6)
Location: ELGIN
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GRADY, OKLAHOMA
From 15-MAY-20 14:08:00 to 15-MAY-20 14:08:00 (CST-6)
Location: LAVERTY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CADDO, OKLAHOMA
From 15-MAY-20 14:12:00 to 15-MAY-20 14:12:00 (CST-6)
Location: CYRIL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COMANCHE, OKLAHOMA
From 15-MAY-20 14:20:00 to 15-MAY-20 14:20:00 (CST-6)
Location: FLETCHER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Location estimate from radar.

Hail in CADDO, OKLAHOMA
From 15-MAY-20 14:25:00 to 15-MAY-20 14:25:00 (CST-6)
Location: CYRIL
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COMANCHE, OKLAHOMA
From 15-MAY-20 14:28:00 to 15-MAY-20 14:28:00 (CST-6)
Location: STERLING
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Flash Flood in GARVIN, OKLAHOMA
From 15-MAY-20 15:30:00 to 15-MAY-20 18:30:00 (CST-6)
Location: PAULS VALLEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Street flooding estimated to be about a foot deep and getting close to businesses. People have started sandbagging.

Flash Flood in GARVIN, OKLAHOMA
From 15-MAY-20 15:44:00 to 15-MAY-20 18:44:00 (CST-6)
Location: WYNNEWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two miles east of I-35 on Highway 29. Several spots of water running onto the highway from flooded ditches.

Hail in GARVIN, OKLAHOMA
From 15-MAY-20 15:46:00 to 15-MAY-20 15:46:00 (CST-6)
Location: WYNNEWOOD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 15-MAY-20 15:55:00 to 15-MAY-20 15:55:00 (CST-6)
Location: MARLOW
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees down in area of 11TH and Choctaw. Several power outages.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 15-MAY-20 15:55:00 to 15-MAY-20 15:55:00 (CST-6)
Location: DUNCAN
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in STEPHENS, OKLAHOMA
From 15-MAY-20 15:56:00 to 15-MAY-20 15:56:00 (CST-6)
Location: MARLOW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in STEPHENS, OKLAHOMA
From 15-MAY-20 16:07:00 to 15-MAY-20 16:07:00 (CST-6)
Location: LAKE FUQUA  DAM
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flood in STEPHENS, OKLAHOMA
From 15-MAY-20 16:08:00 to 15-MAY-20 19:08:00 (CST-6)
Location: DUNCAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Minor flooding on Beech avenue. Water over the curb in some places.

Hail in STEPHENS, OKLAHOMA
From 15-MAY-20 16:08:00 to 15-MAY-20 16:08:00 (CST-6)
Location: DUNCAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flood in GARVIN, OKLAHOMA
From 15-MAY-20 16:20:00 to 15-MAY-20 19:20:00 (CST-6)
Location: STRATFORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Minor street flooding reported. 7-8 inches on some streets.

Hail in JACKSON, OKLAHOMA
From 15-MAY-20 16:21:00 to 15-MAY-20 16:21:00 (CST-6)
Location: ALTUS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JACKSON, OKLAHOMA
From 15-MAY-20 16:23:00 to 15-MAY-20 16:23:00 (CST-6)
Location: ALTUS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JACKSON, OKLAHOMA
From 15-MAY-20 16:24:00 to 15-MAY-20 16:24:00 (CST-6)
Location: ALTUS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Flash Flood in COMANCHE, OKLAHOMA
From 15-MAY-20 16:30:00 to 15-MAY-20 19:30:00 (CST-6)
Location: ELGIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flood waters completely covering a portion of Spencer and Cline roads northeast of Lawton. Delayed report. Time/location estimated.

Flood in STEPHENS, OKLAHOMA
From 15-MAY-20 16:31:00 to 15-MAY-20 19:31:00 (CST-6)
Location: DUNCAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Approximately 4 inches of water over the road in some places.

Hail in JACKSON, OKLAHOMA
From 15-MAY-20 16:36:00 to 15-MAY-20 16:36:00 (CST-6)
Location: (LTS)ALTUS AFB
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JACKSON, OKLAHOMA
From 15-MAY-20 16:37:00 to 15-MAY-20 16:37:00 (CST-6)
Location: (LTS)ALTUS AFB
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Mping report.

Hail in CADDO, OKLAHOMA
From 15-MAY-20 16:38:00 to 15-MAY-20 16:38:00 (CST-6)
Location: BOONE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in STEPHENS, OKLAHOMA
From 15-MAY-20 16:47:00 to 15-MAY-20 19:47:00 (CST-6)
Location: DUNCAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flood waters 6 inches deep flowing over city street curbs.

Hail in TILLMAN, OKLAHOMA
From 15-MAY-20 17:20:00 to 15-MAY-20 17:20:00 (CST-6)
Location: MANITOU
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in TILLMAN, OKLAHOMA
From 15-MAY-20 17:37:00 to 15-MAY-20 17:37:00 (CST-6)
Location: DAVIDSON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Flash Flood in JACKSON, OKLAHOMA
From 15-MAY-20 17:40:00 to 15-MAY-20 20:40:00 (CST-6)
Location: ALTUS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

High water rescue reported.

Hail in TILLMAN, OKLAHOMA
From 15-MAY-20 17:41:00 to 15-MAY-20 17:41:00 (CST-6)
Location: DAVIDSON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in TILLMAN, OKLAHOMA
From 15-MAY-20 17:41:00 to 15-MAY-20 17:41:00 (CST-6)
Location: FREDERICK ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in TILLMAN, OKLAHOMA
From 15-MAY-20 17:46:00 to 15-MAY-20 17:46:00 (CST-6)
Location: FREDERICK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in TILLMAN, OKLAHOMA
From 15-MAY-20 17:50:00 to 15-MAY-20 17:50:00 (CST-6)
Location: FREDERICK
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tin roof removed off house by winds. Time estimated by radar.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 15-MAY-20 17:50:00 to 15-MAY-20 17:50:00 (CST-6)
Location: LAKE FUQUA  DAM
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in TILLMAN, OKLAHOMA
From 15-MAY-20 17:51:00 to 15-MAY-20 17:51:00 (CST-6)
Location: FREDERICK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 15-MAY-20 17:55:00 to 15-MAY-20 17:55:00 (CST-6)
Location: LAKE FUQUA  DAM
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in COMANCHE, OKLAHOMA
From 15-MAY-20 18:00:00 to 15-MAY-20 18:00:00 (CST-6)
Location: MEDICINE PARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in TILLMAN, OKLAHOMA
From 15-MAY-20 18:15:00 to 15-MAY-20 18:15:00 (CST-6)
Location: FREDERICK ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flood in STEPHENS, OKLAHOMA
From 15-MAY-20 18:31:00 to 15-MAY-20 21:31:00 (CST-6)
Location: BRAY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Three to four inches of quickly moving water across about 1/8 mile of the roadway.

Hail in STEPHENS, OKLAHOMA
From 15-MAY-20 18:35:00 to 15-MAY-20 18:35:00 (CST-6)
Location: LAKE FUQUA  DAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Mping report.

Flash Flood in TILLMAN, OKLAHOMA
From 15-MAY-20 19:01:00 to 15-MAY-20 22:01:00 (CST-6)
Location: FREDERICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy street flooding with 3 inches of rain.

Flood in COMANCHE, OKLAHOMA
From 15-MAY-20 19:10:00 to 15-MAY-20 22:10:00 (CST-6)
Location: LAWTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Minor flooding of intersection.

Hail in TILLMAN, OKLAHOMA
From 15-MAY-20 19:37:00 to 15-MAY-20 19:37:00 (CST-6)
Location: GRANDFIELD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash Flood in COMANCHE, OKLAHOMA
From 15-MAY-20 19:38:00 to 15-MAY-20 22:38:00 (CST-6)
Location: CACHE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy street flooding reported in many city streets.

Flash Flood in STEPHENS, OKLAHOMA
From 15-MAY-20 20:02:00 to 15-MAY-20 23:02:00 (CST-6)
Location: MARLOW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Flood waters threatening home.