An active day of severe weather across the Panhandles. The main 500-300 mb synoptic pattern the morning into the afternoon of the 28th showed an upper level low pressure moving through the central Rockies with an embedded jet streak rounding the base of the upper level low pressure across portions of Arizona and New Mexico. This resulted in a large region of favorable ascent with high mid level lapse rates above 8 C/km across the northern Panhandles in the left exit region of the jet streak. A surface dryline also developed across the western Panhandles where good surface based directional shear was established along this boundary of SE winds ahead of the dryline vs. SW to westerly behind the boundary. Ahead of the dryline, 850-700 mb moisture surged northward with good 20-30 kts mean southerly wind flow to further enhance the gradient setup across the dryline. Morning sounding profiles did show some cap, but with good heating during the day, thunderstorms eventually developed along the dryline. With sufficient SBCAPE of 2000-3000 J/kg, effective shear of 30-40 kts, and good CAPE in the hail growth zone given low freezing levels, storms developed in multi cell clusters. Individual cells did have a strong updraft to produce hail sizes that maxed out around 3 in diameter; along with damaging winds gusts/reports. Thunderstorms across the northern and central half of the cluster did eventually cluster up to form line segments. With the daytime heating still in place into the early evening hours, coupled with 0-1 km SRH values around 200 m2/s2, enough low level rotation did drop 2 tornadoes across Texas County, OK with an EF-0 and EF-1 rating. Storms remained mostly cellular on the southern segment of storms where large hail and strong rotating thunderstorms continued into the late evening hours across the eastern Panhandles before the storms exiting east of the region during the overnight hours.

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 16:42:00 to 28-MAY-18 16:42:00 (CST-6)
Location: TEXHOMA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 17:26:00 to 28-MAY-18 17:26:00 (CST-6)
Location: TEXHOMA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarters sized hail reported.

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 17:44:00 to 28-MAY-18 17:44:00 (CST-6)
Location: TEXHOMA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter to half dollar sized hail reported.

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 18:04:00 to 28-MAY-18 18:04:00 (CST-6)
Location: GOODWELL
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 18:05:00 to 28-MAY-18 18:05:00 (CST-6)
Location: GOODWELL
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Quarter to half dollar sized hail reported.

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 18:06:00 to 28-MAY-18 18:06:00 (CST-6)
Location: GOODWELL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 18:32:00 to 28-MAY-18 18:32:00 (CST-6)
Location: GUYMON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 18:37:00 to 28-MAY-18 18:37:00 (CST-6)
Location: HARDESTY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 18:57:00 to 28-MAY-18 18:57:00 (CST-6)
Location: ADAMS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 19:01:00 to 28-MAY-18 19:01:00 (CST-6)
Location: ADAMS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 19:15:00 to 28-MAY-18 19:15:00 (CST-6)
Location: GUYMON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in TEXAS, OKLAHOMA
From 28-MAY-18 19:25:00 to 28-MAY-18 19:25:00 (CST-6)
Location: GOODWELL
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Late report, time estimated by radar.

Hail in BEAVER, OKLAHOMA
From 28-MAY-18 20:54:00 to 28-MAY-18 20:54:00 (CST-6)
Location: BRYANS CORNER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BEAVER, OKLAHOMA
From 28-MAY-18 21:04:00 to 28-MAY-18 21:04:00 (CST-6)
Location: GRAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BEAVER, OKLAHOMA
From 28-MAY-18 21:12:00 to 28-MAY-18 21:12:00 (CST-6)
Location: BRYANS CORNER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BEAVER, OKLAHOMA
From 28-MAY-18 21:47:00 to 28-MAY-18 21:47:00 (CST-6)
Location: BOYD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in TEXAS, OKLAHOMA
From 28-MAY-18 18:41:00 to 28-MAY-18 18:42:00 (CST-6)
Location: GOODWELL
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tornado touched down just south of Goodwell, causing a damage path approximately 50 yards wide and a quarter mile long.  The tornado caused a barn to collapse after lifting the roof off of it.

Tornado in TEXAS, OKLAHOMA
From 28-MAY-18 19:21:00 to 28-MAY-18 19:24:00 (CST-6)
Location: HARDESTY
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A brief tornado touched down was photographed or recorded by multiple storm chasers just west of Hardesty. Power lines arched near the touchdown area where a main double pole transmission line was snapped.  Four smaller power poles were also snapped. Damages to fencing, a car port, a large storage container and trees were also noted in a storm survey. The storage container and a watering trough lifted off the ground and were pushed up to 10 to 30 feet.

Thunderstorm Wind in TEXAS, OKLAHOMA
From 28-MAY-18 18:45:00 to 28-MAY-18 18:45:00 (CST-6)
Location: GOODWELL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Roof blown off barn, and another barn collapsed near Goodwell, OK.

Thunderstorm Wind in TEXAS, OKLAHOMA
From 28-MAY-18 19:38:00 to 28-MAY-18 19:38:00 (CST-6)
Location: HARDESTY
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Roof blown off barn.