There was a swath of large hail from around Fort Smith (Sebastian County) to just south of Little Rock (Pulaski County) to Monticello (Drew County) during the afternoon and evening of 3/10/2018.
Another cold front dropped southward through Arkansas on March 10th. During the late afternoon, scattered strong to severe thunderstorms mushroomed along the Arkansas River. Reports of hail poured into the National Weather Service between 400 pm and 800 pm CST. Initially, stones were as large as golf balls and hen eggs.
As storms progressed into southeast Arkansas (mostly after 800 pm CST), hail got even bigger. Stones reached baseball to almost softball size at White Hall and Pine Bluff (both in Jefferson County).
Hail damage was extensive, especially where the largest stones were observed in Jefferson County. Car windows were busted out, automobile bodies were dented (beyond repair in many cases), and roofs of homes and businesses were pelted. Damage will undoubtedly be in the millions of dollars.

Hail in JEFFERSON, ARKANSAS
From 10-MAR-18 20:37:00 to 10-MAR-18 20:37:00 (CST-6)
Location: HOOKER
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Public

Large hail of around 2 inches in diameter fell near Terry, breaking windshields.

Hail in PULASKI, ARKANSAS
From 10-MAR-18 19:59:00 to 10-MAR-18 19:59:00 (CST-6)
Location: CYPRESS JCT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CONWAY, ARKANSAS
From 10-MAR-18 18:27:00 to 10-MAR-18 18:27:00 (CST-6)
Location: PETIT JEAN STATE PARK
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm Wind in YELL, ARKANSAS
From 10-MAR-18 18:10:00 to 10-MAR-18 18:10:00 (CST-6)
Location: CHICKALAH
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A few power poles were blown down.

Hail in PERRY, ARKANSAS
From 10-MAR-18 19:10:00 to 10-MAR-18 19:10:00 (CST-6)
Location: HOUSTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SALINE, ARKANSAS
From 10-MAR-18 19:21:00 to 10-MAR-18 19:21:00 (CST-6)
Location: BENTON SALINE CO ARP
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SALINE, ARKANSAS
From 10-MAR-18 19:25:00 to 10-MAR-18 19:25:00 (CST-6)
Location: BENTON SALINE CO ARP
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DESHA, ARKANSAS
From 10-MAR-18 19:59:00 to 10-MAR-18 19:59:00 (CST-6)
Location: MC GEHEE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in SALINE, ARKANSAS
From 10-MAR-18 19:28:00 to 10-MAR-18 19:28:00 (CST-6)
Location: BENTON SALINE CO ARP
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in GRANT, ARKANSAS
From 10-MAR-18 19:30:00 to 10-MAR-18 19:30:00 (CST-6)
Location: ICO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in GRANT, ARKANSAS
From 10-MAR-18 19:30:00 to 10-MAR-18 19:30:00 (CST-6)
Location: TULL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PULASKI, ARKANSAS
From 10-MAR-18 19:50:00 to 10-MAR-18 19:50:00 (CST-6)
Location: WRIGHTSVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SALINE, ARKANSAS
From 10-MAR-18 19:32:00 to 10-MAR-18 19:32:00 (CST-6)
Location: WEST BAUXITE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PERRY, ARKANSAS
From 10-MAR-18 18:41:00 to 10-MAR-18 18:41:00 (CST-6)
Location: FOURCHE JCT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in PERRY, ARKANSAS
From 10-MAR-18 18:50:00 to 10-MAR-18 18:50:00 (CST-6)
Location: PERRYVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A large tree was blown down, blocking the intersection of Highway 9 and Highway 300.

Hail in JEFFERSON, ARKANSAS
From 10-MAR-18 20:43:00 to 10-MAR-18 20:43:00 (CST-6)
Location: WHITE HALL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PERRY, ARKANSAS
From 10-MAR-18 19:02:00 to 10-MAR-18 19:02:00 (CST-6)
Location: HOUSTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PULASKI, ARKANSAS
From 10-MAR-18 20:00:00 to 10-MAR-18 20:00:00 (CST-6)
Location: WOODLAND HGTS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JEFFERSON, ARKANSAS
From 10-MAR-18 20:07:00 to 10-MAR-18 20:07:00 (CST-6)
Location: WHITE HALL
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in JEFFERSON, ARKANSAS
From 10-MAR-18 20:14:00 to 10-MAR-18 20:14:00 (CST-6)
Location: WATSON CHAPEL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in DREW, ARKANSAS
From 10-MAR-18 22:10:00 to 10-MAR-18 22:10:00 (CST-6)
Location: MONTICELLO MUNI ARPT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in DREW, ARKANSAS
From 10-MAR-18 22:22:00 to 10-MAR-18 22:22:00 (CST-6)
Location: MONTICELLO MUNI ARPT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CONWAY, ARKANSAS
From 10-MAR-18 22:31:00 to 10-MAR-18 22:31:00 (CST-6)
Location: OPPELO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in LINCOLN, ARKANSAS
From 10-MAR-18 20:19:00 to 10-MAR-18 20:19:00 (CST-6)
Location: REST
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JEFFERSON, ARKANSAS
From 10-MAR-18 20:16:00 to 10-MAR-18 20:16:00 (CST-6)
Location: PINE BLUFF
Magnitude: 3.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JEFFERSON, ARKANSAS
From 10-MAR-18 20:15:00 to 10-MAR-18 20:15:00 (CST-6)
Location: WATSON CHAPEL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DESHA, ARKANSAS
From 10-MAR-18 21:15:00 to 10-MAR-18 21:15:00 (CST-6)
Location: MC GEHEE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager