Alert archive / Mississippi / Flash Flood Watches in 2019

Flash Flood Watch 2, NWS Memphis, TN

February 20, 201922 counties in Mississippi; 21 counties in Tennessee

NWS Memphis, TN issued this flash flood watch at Feb 20, 2019, 4:06 AM CST for 22 counties in Mississippi; 21 counties in Tennessee. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Feb 20, 2019, 4:06 AM CST (10:06 UTC)
Expired: Feb 20, 2019, 12:47 PM CST
In force: 9 hr
Issued by: NWS Memphis, TN

All 43 counties

Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 75 km from the middle of the area, began a volume at 10:05 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Little Rock, AR (KBYH), launched 00:00Z, 10.1 hours before the alert went out and 79 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 455 m above ground
0-6 km bulk shear: 91 kt
0-1 km storm-relative helicity: 1018 m²/s²
0-3 km storm-relative helicity: 1573 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Memphis, TN wrote its last area forecast discussion before this flash flood watch went out at Feb 20, 3:49 AM CST, 17 minutes earlier.

Area forecast discussion, Feb 20, 3:49 AM CST, 17 minutes before

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Hazardous weather outlook, Feb 19, 2:47 PM CST, 13 hours 19 minutes before

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In the hours before

Special weather statement, Feb 19, 10:57 PM CST, 5 hours 9 minutes before

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The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 19, 10:57 PM CST	Special Weather Statement	MEG	Coahoma, Tate	48 min
Feb 20, 2:40 AM CST	Areal Flood Advisory	MEG	Lafayette, Marshall, Panola, Tallahatchie, Yalobusha	2 hr
Feb 20, 3:37 AM CST	Areal Flood Advisory	MEG	Benton, Lafayette, Marshall, Pontotoc, Tippah, Union	113 min
Feb 20, 4:01 AM CST	Areal Flood Advisory	MEG	Alcorn, Prentiss, Tippah	119 min
Feb 20, 4:38 AM CST	Areal Flood Advisory	MEG	Calhoun, Chickasaw, Lafayette, Lee, Pontotoc, Prentiss and 1 more	112 min
Feb 20, 4:42 AM CST	Areal Flood Advisory	MEG	Alcorn, Prentiss, Tishomingo	2 hr
Feb 20, 7:27 AM CST	Areal Flood Advisory	MEG	Calhoun, Chickasaw, Lafayette, Lee, Pontotoc, Union	2 hr
Feb 20, 7:31 AM CST	Areal Flood Advisory	MEG	Alcorn, Itawamba, Lee, Prentiss, Tishomingo	119 min
Feb 20, 8:51 AM CST	Flash Flood Warning	MEG	Calhoun, Chickasaw, Itawamba, Lee, Monroe, Pontotoc	3 hr
Feb 20, 9:36 AM CST	Areal Flood Advisory	MEG	Alcorn, Itawamba, Lee, Prentiss, Tippah, Tishomingo and 1 more	114 min
Feb 20, 9:42 AM CST	Areal Flood Warning	MEG	Calhoun, Lafayette, Panola, Pontotoc, Yalobusha	3 hr
Feb 20, 10:30 AM CST	River Flood Warning	MEG	Tate, Tunica	10 hr
Feb 20, 10:46 AM CST	River Flood Warning	MEG	Calhoun	17 hr
Feb 20, 11:40 AM CST	Areal Flood Warning	MEG	Calhoun, Chickasaw, Itawamba, Lee, Monroe, Pontotoc and 3 more	6 hr
Feb 20, 1:06 PM CST	River Flood Warning	MEG	Calhoun	17 hr
Feb 20, 3:34 PM CST	Flash Flood Watch	MEG	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	3 days
Feb 20, 4:07 AM CST	Areal Flood Advisory	MEG	Benton, Carroll, Chester, Decatur, Hardin, Henderson	113 min

Nearby

Flash Flood Watches in Mississippi, 2019 Flash Flood Watches in Tennessee, 2019 Every flash flood watch in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.