When the wind starts kicking up, there is probably something coming. Such was the case on the 9th, with south to southwest winds gusting from 30 to 40 mph in parts of Arkansas as of 500 am CST. At that time, a cold front was entering the northwest corner of the state from the Plains.
By 1200 pm CST, temperatures ahead of the front were in the mid 70s to lower 80s across the central/southern counties. Dewpoints were in the mid 60s to lower 70s (humid). These were favorable conditions for thunderstorm development, and a Severe Thunderstorm Watch was posted until 900 pm CDT. It felt like another season behind the front. Thermometers were showing readings in the mid 50s in parts of the Ozark Mountains including Bentonville and Rogers (both in Benton County). Winds had shifted to the north.
The first severe storm of the afternoon tracked from southern Van Buren County into Faulkner County. At 130 pm CST, quarter size hail occurred about six miles north of Enola (Faulkner County). Fifteen minutes later, golf ball to baseball size hail pelted the Mount Vernon (Faulkner County) community.
Between 230 pm and 600 pm CST, the focus shifted farther south. Golf ball size hail came down near Kimberley (Pike County), Chambersville (Calhoun County), and Thornton (Calhoun County). There were ping pong balls at Bearden (Ouachita County), and half dollars at Camden (Ouachita County). Thunderstorm gusts downed trees at   Hilo (Bradley County).

Hail in WHITE, ARKANSAS
From 09-MAY-21 13:45:00 to 09-MAY-21 13:45:00 (CST-6)
Location: BOYKIN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Ping Pong ball sized hailstones were found.

Hail in WHITE, ARKANSAS
From 09-MAY-21 13:40:00 to 09-MAY-21 13:40:00 (CST-6)
Location: BOYKIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Quarter size hail was shared on social media.

Hail in OUACHITA, ARKANSAS
From 09-MAY-21 16:55:00 to 09-MAY-21 16:55:00 (CST-6)
Location: CAMDEN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Half dollar size hail was reported in Camden.

Hail in OUACHITA, ARKANSAS
From 09-MAY-21 16:54:00 to 09-MAY-21 16:54:00 (CST-6)
Location: COLLENDALE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A social media picture showed half dollar size hail next to a tape measure.

Thunderstorm Wind in BRADLEY, ARKANSAS
From 09-MAY-21 17:54:00 to 09-MAY-21 17:54:00 (CST-6)
Location: HILO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A report was received of trees down along Highway 63.

Hail in CALHOUN, ARKANSAS
From 09-MAY-21 16:22:00 to 09-MAY-21 16:22:00 (CST-6)
Location: ELBERTA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in WHITE, ARKANSAS
From 09-MAY-21 14:19:00 to 09-MAY-21 14:19:00 (CST-6)
Location: KENSETT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Quarter size hail was shared on social media in Kensett.

Hail in PIKE, ARKANSAS
From 09-MAY-21 14:53:00 to 09-MAY-21 14:53:00 (CST-6)
Location: KIMBERLEY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Pictures of golf ball size hail were on social media.

Hail in FAULKNER, ARKANSAS
From 09-MAY-21 13:47:00 to 09-MAY-21 13:47:00 (CST-6)
Location: MT VERNON
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

There was a picture on social media of baseball sized hail.

Hail in RANDOLPH, ARKANSAS
From 06-MAY-21 12:17:00 to 06-MAY-21 12:17:00 (CST-6)
Location: RAVENDEN SPGS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in RANDOLPH, ARKANSAS
From 06-MAY-21 12:27:00 to 06-MAY-21 12:27:00 (CST-6)
Location: LORINE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in LOGAN, ARKANSAS
From 07-MAY-21 18:10:00 to 07-MAY-21 18:10:00 (CST-6)
Location: PARIS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in FAULKNER, ARKANSAS
From 09-MAY-21 13:20:00 to 09-MAY-21 13:20:00 (CST-6)
Location: ENDERS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in FAULKNER, ARKANSAS
From 09-MAY-21 13:30:00 to 09-MAY-21 13:30:00 (CST-6)
Location: ENDERS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm Wind in WHITE, ARKANSAS
From 09-MAY-21 14:21:00 to 09-MAY-21 14:21:00 (CST-6)
Location: GRIFFITHVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A power pole was snapped.

Hail in CALHOUN, ARKANSAS
From 09-MAY-21 15:36:00 to 09-MAY-21 15:36:00 (CST-6)
Location: THORNTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Quarter to golf ball size hail was reported south of Thornton on social media.

Hail in OUACHITA, ARKANSAS
From 09-MAY-21 15:39:00 to 09-MAY-21 15:39:00 (CST-6)
Location: BEARDEN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Ping pong ball size hail was noted in Bearden on social media.

Hail in CALHOUN, ARKANSAS
From 09-MAY-21 15:56:00 to 09-MAY-21 15:56:00 (CST-6)
Location: ELBERTA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CALHOUN, ARKANSAS
From 09-MAY-21 16:01:00 to 09-MAY-21 16:01:00 (CST-6)
Location: CHAMBERSVILLE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Ping pong ball size hail was shared on social media.

Hail in CALHOUN, ARKANSAS
From 09-MAY-21 16:03:00 to 09-MAY-21 16:03:00 (CST-6)
Location: CHAMBERSVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Golf ball size hail was shared on social media.