Alert archive / Tennessee / Areal Flood Advisories in 2021

Areal Flood Advisory 13, NWS Memphis, TN

March 27, 2021DeSoto County, Mississippi; 4 counties in Tennessee; Crittenden County, Arkansas

NWS Memphis, TN issued this areal flood advisory at Mar 27, 2021, 9:01 AM CDT for DeSoto County, Mississippi; 4 counties in Tennessee; Crittenden County, Arkansas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Mar 27, 2021, 9:01 AM CDT (14:01 UTC)
Expired: Mar 27, 2021, 11:50 AM CDT
In force: 3 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon

Counties Crittenden County, AR, DeSoto County, MS, Fayette County, TN, Haywood County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 13 km from the middle of the area, began a volume at 14:00 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 (KLZK), launched 12:00Z, 2.0 hours before the alert went out and 50 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: 265 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 853 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 areal flood advisory went out at Mar 27, 6:33 AM CDT, 2 hours 28 minutes earlier.

Area forecast discussion, Mar 27, 6:33 AM CDT, 2 hours 28 minutes before

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Hazardous weather outlook, Mar 27, 4:52 AM CDT, 4 hours 9 minutes before

Hazardous Weather Outlook
National Weather Service Memphis TN
452 AM CDT Sat Mar 27 2021

ARZ009-018-026>028-035-036-048-049-058-MOZ113-115-MSZ001>017-
020>024-TNZ001>004-019>022-048>055-088>092-281200-
Alcorn-Benton MS-Benton TN-Calhoun-Carroll-Chester-Chickasaw-Clay-
Coahoma-Craighead-Crittenden-Crockett-Cross-DeSoto-Decatur-
Dunklin-Dyer-Fayette-Gibson-Greene-Hardeman-Hardin-Haywood-
Henderson-Henry-Itawamba-Lafayette-Lake-Lauderdale-Lee AR-Lee MS-
Madison-Marshall-McNairy-Mississippi-Monroe-Obion-Panola-Pemiscot-
Phillips-Poinsett-Pontotoc-Prentiss-Quitman-Shelby-St. Francis-
Tallahatchie-Tate-Tippah-Tipton-Tishomingo-Tunica-Union-Weakley-
Yalobusha-
452 AM CDT Sat Mar 27 2021

This hazardous weather outlook is for portions of East Arkansas...
the Missouri Bootheel...North Mississippi...and West Tennessee.

.DAY ONE...Today and Tonight

An Slight to Enhanced Risk of Severe storms exists for the Midsouth
Saturday and Saturday night. All modes of severe weather will be
possible. Damaging winds, large hail, flash flooding, and
tornadoes will be possible.

A Flash Flood Watch is in effect for a large portion of the
forecast area through Sunday morning. See website for more
details.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed today through early
Sunday morning. Please relay any information about observed
severe weather to the NWS while following all local, state, and
CDC guidelines.

In the hours before

Special weather statement, Mar 27, 6:32 AM CDT, 2 hours 29 minutes before

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Local storm report, Mar 27, 6:41 AM CDT, 2 hours 20 minutes before

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Special weather statement, Mar 27, 7:00 AM CDT, 2 hours 1 minute before

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Special weather statement, Mar 27, 7:16 AM CDT, 1 hour 45 minutes before

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Special weather statement, Mar 27, 7:52 AM CDT, 1 hour 9 minutes before

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Local storm report, Mar 27, 8:37 AM CDT, 24 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
Mar 27, 2:44 AM CDT	Flash Flood Watch	MEG	Alcorn, Benton, DeSoto, Marshall, Prentiss, Tate and 4 more	24 hr
Mar 27, 4:51 AM CDT	Special Weather Statement	MEG	DeSoto	24 min
Mar 27, 5:13 AM CDT	Flash Flood Warning	MEG	DeSoto, Tunica	3 hr
Mar 27, 5:34 AM CDT	Severe Thunderstorm Warning	MEG	DeSoto	41 min
Mar 27, 6:01 AM CDT	Special Weather Statement	MEG	Union	29 min
Mar 27, 6:32 AM CDT	Special Weather Statement	MEG	Alcorn, Tippah	43 min
Mar 27, 7:16 AM CDT	Special Weather Statement	MEG	Tishomingo	29 min
Mar 27, 7:52 AM CDT	Special Weather Statement	MEG	Alcorn, Prentiss, Tippah	38 min
Mar 27, 9:07 AM CDT	Areal Flood Advisory	MEG	Alcorn, Prentiss, Tippah	4 hr
Mar 27, 4:48 PM CDT	Severe Thunderstorm Warning	MEG	Monroe	42 min
Mar 27, 5:31 PM CDT	Special Weather Statement	MEG	Itawamba	29 min
Mar 27, 4:59 AM CDT	Special Weather Statement	MEG	Tipton	31 min
Mar 27, 5:06 AM CDT	Special Weather Statement	MEG	Carroll, Madison	24 min
Mar 27, 5:14 AM CDT	Flash Flood Warning	MEG	Madison	3 hr
Mar 27, 5:20 AM CDT	Special Weather Statement	MEG	Shelby	40 min
Mar 27, 5:37 AM CDT	Special Weather Statement	MEG	Benton, Carroll	53 min
Mar 27, 5:56 AM CDT	Special Weather Statement	MEG	Fayette	49 min
Mar 27, 7:00 AM CDT	Special Weather Statement	MEG	Chester, Henderson, McNairy	30 min
Mar 27, 9:33 AM CDT	Flash Flood Warning	MEG	Chester, Decatur, Hardeman, Hardin, Henderson, McNairy	5 hr
Mar 27, 11:29 AM CDT	River Flood Warning	MEG	Fayette, Shelby	44 hr
Mar 27, 11:29 AM CDT	River Flood Warning	MEG	Madison	4 days
Mar 27, 11:29 AM CDT	River Flood Warning	MEG	Crockett, Dyer, Lauderdale	14 days
Mar 27, 11:29 AM CDT	River Flood Warning	MEG	Shelby	23 hr
Mar 27, 3:45 PM CDT	Special Weather Statement	MEG	Tipton	30 min
Mar 27, 3:50 PM CDT	Special Weather Statement	MEG	Madison	25 min
Mar 27, 4:05 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Hardeman, Henderson, Madison	40 min
Mar 27, 4:15 PM CDT	Special Weather Statement	MEG	Lauderdale	30 min
Mar 27, 4:35 PM CDT	Tornado Warning	MEG	Chester, Decatur, Henderson	40 min
Mar 27, 5:05 PM CDT	Areal Flood Advisory	MEG	Chester, Henderson, Madison	3 hr
Mar 27, 5:08 PM CDT	Tornado Warning	MEG	Decatur, Henderson	22 min
Mar 27, 5:42 PM CDT	Tornado Warning	MEG	Lauderdale	48 min
Mar 27, 6:23 PM CDT	Tornado Warning Tornado observed	MEG	Lauderdale	52 min
Mar 27, 5:13 PM CDT	Special Weather Statement	MEG	Cross	32 min
Mar 27, 5:31 PM CDT	Severe Thunderstorm Warning	MEG	Cross, St. Francis	44 min
Mar 27, 5:38 PM CDT	Areal Flood Advisory	MEG	Crittenden, Cross, Mississippi, Poinsett, St. Francis	112 min
Mar 27, 5:48 PM CDT	Tornado Warning	MEG	Crittenden, Cross, Poinsett	42 min
Mar 27, 6:28 PM CDT	Special Weather Statement	MEG	Crittenden	32 min
Mar 27, 6:54 PM CDT	Special Weather Statement	MEG	Cross	51 min
Mar 27, 6:57 PM CDT	Special Weather Statement	MEG	Mississippi	48 min

Nearby

Areal Flood Advisories in Tennessee, 2021 Areal Flood Advisories in Mississippi, 2021 Areal Flood Advisories in Arkansas, 2021 Every areal flood advisory in 2021

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.