Early on the 11th, a front was parked over southern Arkansas, with a storm system approaching from the west. The system set off a large area of showers and thunderstorms in Kansas that tracked along and north of the front through northeast Oklahoma and into our neck of the woods.
Between 600 am and 800 am CDT on the 11th, severe storms cranked out quarter size hail at Jerusalem (Conway County) and just northwest of Walnut (Newton County). At least 2.00 inches of rain was unleashed from the clouds at Center Hill (White County), with 1.98 inches at Damascus (Van Buren County).
The front exited to the north on the 12th, and it warmed up markedly. Afternoon temperatures were in the 70s and 80s. Readings peaked at 88 degrees in Fort Smith (Sebastian County), 85 degrees at Fayetteville (Washington County), and 84 degrees at Harrison (Boone County).
So much warmth destabilized the atmosphere. All that was needed was a trigger to spark more thunderstorms. In this case, the trigger was a new cold front surging into the region from the Plains.
Scattered severe storms bubbled up across the northern and western counties. A couple of storms showed signs of rotation (supercells) from Fulton into Sharp Counties (in the Ozark Mountains), and from Polk into Montgomery Counties (in the Ouachita Mountains). Fortunately, no tornadoes were spawned. Instead, there was large hail.
Up to golf ball size hail pelted locations near Ash Flat (Sharp County), with ping pong ball size hail close to Pearcy (Garland County), and half dollar size hail at Fawn Park (Baxter County), Horseshoe Bend (Izard County), and Pine Ridge (Montgomery County).
Storms on the 12th consolidated south of Little Rock (Pulaski County) and became widespread during the overnight hours. One to more than two inches of rain was measured at Antoine (Pike County), Cane Creek State Park (Lincoln County), Fordyce (Dallas County), Monticello (Drew County), Mount Ida (Montgomery County), Murfreesboro (Pike County), Pine Bluff (Jefferson County), and Pine Ridge (Montgomery County).
The front eventually came to a halt over northern Louisiana, and much cooler air followed. By the 14th, high temperatures were only in the 40s and 50s in the northern half of the state. It was only 43 degrees at Harrison (Boone County) and Mountain Home (Baxter County), and 46 degrees at Newport (Jackson County). Meanwhile, readings were in the 70s across the far south.
North of the front, a narrow band of heavy rain (two to three inch amounts) setup from around North Little Rock (Pulaski County) to Cabot (Lonoke County), and Des Arc (Prairie County). Hit and miss thunderstorms deposited quarter size hail near Pleasant Valley (Perry County), and pennies at Cabot (Lonoke County).
For the event (ninety six hour time frame ending at 600 am CST on the 15th), one to more than three inches of precipitation was common in Arkansas.

Hail in CONWAY, ARKANSAS
From 11-MAR-20 06:24:00 to 11-MAR-20 06:24:00 (CST-6)
Location: JERUSALEM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in NEWTON, ARKANSAS
From 11-MAR-20 06:43:00 to 11-MAR-20 06:43:00 (CST-6)
Location: WALNUT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Heavy Rain in WHITE, ARKANSAS
From 11-MAR-20 07:39:00 to 11-MAR-20 07:39:00 (CST-6)
Location: CENTER HILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated two inches of rain fell near Center Hill.

Hail in BAXTER, ARKANSAS
From 12-MAR-20 15:08:00 to 12-MAR-20 15:08:00 (CST-6)
Location: MOUNTAIN HOME
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm Wind in FULTON, ARKANSAS
From 12-MAR-20 15:33:00 to 12-MAR-20 15:33:00 (CST-6)
Location: RUTH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Trees were blown over 8 miles west of Viola.

Hail in IZARD, ARKANSAS
From 12-MAR-20 16:03:00 to 12-MAR-20 16:03:00 (CST-6)
Location: HORSESHOE BEND
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in SHARP, ARKANSAS
From 12-MAR-20 16:12:00 to 12-MAR-20 16:12:00 (CST-6)
Location: ASH FLAT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Golfball size hail was reported along Hwy. 167.

Hail in MONTGOMERY, ARKANSAS
From 12-MAR-20 18:00:00 to 12-MAR-20 18:00:00 (CST-6)
Location: PINE RIDGE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in MONTGOMERY, ARKANSAS
From 12-MAR-20 18:17:00 to 12-MAR-20 18:17:00 (CST-6)
Location: MT IDA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in IZARD, ARKANSAS
From 12-MAR-20 18:19:00 to 12-MAR-20 18:19:00 (CST-6)
Location: STELLA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large hail fell between Mt. Pleasant and Melbourne.

Thunderstorm Wind in VAN BUREN, ARKANSAS
From 12-MAR-20 18:20:00 to 12-MAR-20 18:20:00 (CST-6)
Location: CLINTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several large tree limbs were down near Choctaw.

Heavy Rain in MONTGOMERY, ARKANSAS
From 12-MAR-20 18:41:00 to 12-MAR-20 18:41:00 (CST-6)
Location: MT IDA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Heavy rain fell. ASOS recorded 0.77 inches of rain in 10 minutes from 631 PM CST to 741 PM CST.

Heavy Rain in MONTGOMERY, ARKANSAS
From 12-MAR-20 19:15:00 to 12-MAR-20 19:15:00 (CST-6)
Location: CADDO GAP
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Heavy rain of 0.81 inches fell in 15 minutes between 700 PM CST and 715 PM CST. Also, 0.55 inches of rain fell between 645 PM CST and 700 PM CST, and 0.50 inches fell between 715 PM CST and 730 PM CST.

Hail in HOT SPRING, ARKANSAS
From 12-MAR-20 19:22:00 to 12-MAR-20 19:22:00 (CST-6)
Location: BISMARCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

In addition to quarter size hail, the observer reported one inch of rain in 45 minutes.

Flash Flood in POLK, ARKANSAS
From 12-MAR-20 19:41:00 to 12-MAR-20 22:41:00 (CST-6)
Location: INK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was reported to cover Hwy. 88.

Thunderstorm Wind in HOT SPRING, ARKANSAS
From 12-MAR-20 19:45:00 to 12-MAR-20 19:45:00 (CST-6)
Location: BROWN SPGS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two trees were down along I-30 near the Social Hill Exit.

Hail in PERRY, ARKANSAS
From 14-MAR-20 16:57:00 to 14-MAR-20 16:57:00 (CST-6)
Location: PLEASANT VLY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

One inch diameter hail was reported between Bigelow and Wye Mountain. The time was estimated from radar and the report was relayed via social media.

Hail in LONOKE, ARKANSAS
From 14-MAR-20 18:28:00 to 14-MAR-20 18:28:00 (CST-6)
Location: CABOT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Reports of dime to penny size hail came in from Cabot. The time was estimated from radar and reports were relayed via social media.

Hail in GARLAND, ARKANSAS
From 12-MAR-20 18:59:00 to 12-MAR-20 18:59:00 (CST-6)
Location: PEARCY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Silver dollar sized hail was reported near Pearcy.