Alert archive / Tennessee / Areal Flood Advisories in 2021

Areal Flood Advisory 39, NWS Memphis, TN

May 3, 2021Decatur County, Henderson County, Madison County, Tennessee

NWS Memphis, TN issued this areal flood advisory at May 3, 2021, 7:54 AM CDT for Decatur County, Henderson County, Madison County, Tennessee. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
May 3, 2021, 7:54 AM CDT (12:54 UTC)
Expired
May 3, 2021, 10:00 AM CDT
In force
2 hr
Issued by
NWS Memphis, TN
Area
Storm-based polygon

Counties Decatur County, TN, Henderson County, TN, Madison County, TN

The radar

The Memphis radar (KNQA), 133 km from the middle of the area, began a volume at 12:57 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, 0.9 hours before the alert went out and 163 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-pSkew-T log-p diagram, Little Rock, AR at 12:00Z on 2021-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1119 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 12:00Z on 2021-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 141 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1119 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
546 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
141 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.2

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 May 3, 7:04 AM CDT, 50 minutes earlier.

Area forecast discussion, May 3, 7:04 AM CDT, 50 minutes before
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Hazardous weather outlook, May 3, 4:25 AM CDT, 3 hours 29 minutes before
Hazardous Weather Outlook
National Weather Service Memphis TN
425 AM CDT Mon May 3 2021

ARZ009-018-026>028-035-036-048-049-058-MOZ113-115-MSZ001>017-
020>024-TNZ001>004-019>022-048>055-088>092-041130-
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-
425 AM CDT Mon May 3 2021

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

.DAY ONE...Today and Tonight

Strong to severe thunderstorms will be possible across the Mid
South late tonight. Damaging wind, very large hail and tornadoes
are possible. See website for additional details.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Strong to severe thunderstorm threat will continue into Tuesday.
Damaging wind, large hail and tornadoes are possible. See website
for additional details.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed late tonight and Tuesday.
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, May 3, 2:36 AM CDT, 5 hours 18 minutes before
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Local storm report, May 3, 3:02 AM CDT, 4 hours 52 minutes before
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Special weather statement, May 3, 3:06 AM CDT, 4 hours 48 minutes before
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Special weather statement, May 3, 3:35 AM CDT, 4 hours 19 minutes before
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Special weather statement, May 3, 4:48 AM CDT, 3 hours 6 minutes before
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Special weather statement, May 3, 4:58 AM CDT, 2 hours 56 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 2, 7:42 PM CDTTornado WarningMEGCalhoun, Chickasaw48 min
May 2, 8:29 PM CDTTornado WarningMEGCalhoun, Chickasaw, Pontotoc46 min
May 2, 9:13 PM CDTTornado WarningMEGChickasaw, Lee, Pontotoc47 min
May 2, 9:53 PM CDTTornado Warning EmergencyTornado observedCatastrophic damage threatMEGItawamba, Lee, Prentiss, Tishomingo52 min
May 2, 10:37 PM CDTTornado Warning Tornado observedConsiderable damage threatMEGItawamba, Prentiss, Tishomingo38 min
May 3, 12:12 AM CDTSpecial Weather StatementMEGLafayette33 min
May 3, 12:38 AM CDTSpecial Weather StatementMEGTippah37 min
May 3, 12:48 AM CDTSpecial Weather StatementMEGTunica27 min
May 3, 12:49 AM CDTSpecial Weather StatementMEGPontotoc26 min
May 3, 1:31 AM CDTSpecial Weather StatementMEGDeSoto29 min
May 3, 1:45 AM CDTSevere Thunderstorm WarningMEGDeSoto, Marshall, Tate45 min
May 3, 2:30 AM CDTSpecial Weather StatementMEGBenton30 min
May 3, 2:36 AM CDTSpecial Weather StatementMEGMarshall24 min
May 3, 5:57 AM CDTAreal Flood AdvisoryMEGDeSoto110 min
May 3, 12:05 PM CDTSpecial Weather StatementMEGClay25 min
May 3, 12:23 PM CDTSpecial Weather StatementMEGMonroe37 min
May 3, 12:31 PM CDTSpecial Weather StatementMEGMonroe29 min
May 3, 1:01 PM CDTSpecial Weather StatementMEGMonroe29 min
May 3, 1:30 PM CDTSpecial Weather StatementMEGMonroe30 min
May 3, 3:06 AM CDTSpecial Weather StatementMEGChester, Hardeman24 min
May 3, 3:35 AM CDTSpecial Weather StatementMEGChester40 min
May 3, 4:48 AM CDTSpecial Weather StatementMEGHaywood27 min
May 3, 4:58 AM CDTSpecial Weather StatementMEGMcNairy32 min
May 3, 5:02 AM CDTAreal Flood AdvisoryMEGHardeman, Hardin, McNairy3 hr
May 3, 7:01 AM CDTAreal Flood AdvisoryMEGHaywood, Madison, Tipton119 min
May 3, 8:21 AM CDTSpecial Weather StatementMEGHardeman24 min

Nearby

Areal Flood Advisories in Tennessee, 2021Every 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.