Flash Flood Watch issued February 19 at 8:32PM CST until February 21 at 6:00AM CST by NWS Memphis

...Flash Flood Watch in effect through Thursday morning for all
of the Mid-South...
.Rain, heavy at times, will continue in response to a persistent
upper level jet over the area. Abundant moisture over the area
will result in rain rates well over an inch per hour. Heavy rain
on top of saturated soil will likely result in flash flooding.
Additional heavy rain later in the work may result in the need to
extend the warning or the issuance of another warning.
...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE WEDNESDAY
NIGHT...
The Flash Flood Watch continues for
* Portions of East Arkansas, North Mississippi, Southeast
Missouri, and West Tennessee, including the following areas,
in East Arkansas, Clay, Craighead, Crittenden, Cross, Greene,
Lee, Mississippi, Phillips, Poinsett, and St. Francis. In
North Mississippi, Alcorn, Benton, Calhoun, Chickasaw,
Coahoma, DeSoto, Itawamba, Lafayette, Lee, Marshall, Monroe,
Panola, Pontotoc, Prentiss, Quitman, Tallahatchie, Tate,
Tippah, Tishomingo, Tunica, Union, and Yalobusha. In Southeast
Missouri, Dunklin and Pemiscot. In West Tennessee, Benton,
Carroll, Chester, Crockett, Decatur, Dyer, Fayette, Gibson,
Hardeman, Hardin, Haywood, Henderson, Henry, Lake, Lauderdale,
Madison, McNairy, Obion, Shelby, Tipton, and Weakley.
* Through late Wednesday night
* 2 to 4 inches of rain is expected across most of the Mid-South.
* Street flooding will be a hazard for travelers. Low-lying and
poor drainage areas will be at risk for flash flooding, as
well as small streams.