Alert archive / Mississippi / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 324, NWS Memphis, TN

September 6, 2023Alcorn County, Tippah County, Mississippi; Hardeman County, McNairy County, Tennessee

NWS Memphis, TN issued this severe thunderstorm warning at Sep 6, 2023, 4:44 PM CDT for Alcorn County, Tippah County, Mississippi; Hardeman County, McNairy County, Tennessee. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 6, 2023, 4:44 PM CDT (21:44 UTC)
Expired: Sep 6, 2023, 5:12 PM CDT
In force: 28 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Alcorn County, MS, Tippah County, MS, Hardeman County, TN, McNairy County, TN

The radar

The Memphis radar (KNQA), 108 km from the middle of the area, began a volume at 21:47 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, 9.7 hours before the alert went out and 110 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: 1857 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Sep 6, 3:45 PM CDT, 59 minutes earlier.

Area forecast discussion, Sep 6, 3:45 PM CDT, 59 minutes before

Area Forecast Discussion
National Weather Service Memphis TN
345 PM CDT Wed Sep 6 2023

...New SYNOPSIS, DISCUSSION...

.SYNOPSIS...
Issued at 345 PM CDT Wed Sep 6 2023

Showers and thunderstorms will continue across north Mississippi
through this evening but slightly cooler and drier air will settle
over the region behind a cold front. A few showers are possible
on Friday, mainly west of Memphis, but generally dry conditions
are expected through Monday. Rain chances will increase by the
middle of next week. Highs will be in the 80s with lows mainly in
the 60s.

&&

.DISCUSSION...
(This evening through next Tuesday)
Issued at 345 PM CDT Wed Sep 6 2023

A shortwave trough diving southeast across the Midwest will
provide large-scale forcing for ascent across the Mid-South
through the evening hours. A cold front extends from surface low
over the Great Lakes, south along the IL/IN border, arcing
southwest into northern AR. South of this front, warm and humid
conditions persist with MLCAPE of 2500-3500 J/kg across a good
portion of the Mid-South. A 500-mb jet streak on the southern
flank of this wave will enhance deep-layer shear, resulting in
effective bulk shear in the neighborhood of 30-35 kts. Storms will
remain loosely organized initially but will likely consolidate
into linear clusters, moving southeast through mid-evening. The
presence of some mid-level dry air will enhance the potential for
damaging wind gusts, though isolated, marginally severe hail is
possible. These storms will move southeast of the CWA by midnight
with dry weather thereafter.

The current heat headlines still look good. Heat index readings
south of I-40 and west of I-55 are at or above 105F with West
Memphis and and Millington still at 103F. Additional convection
may alleviate heat concerns in the current advisory, but no
changes will be made at this time.

Winds will fall off tonight as the boundary layer decouples and
temperatures fall into the mid 60s, promoting patchy fog
development, primarily to the east of the MS River. Similar
conditions will be possible Thursday night, though perhaps tied
more to water sources like near lakes and river valleys in the
post- frontal air mass. Slightly cooler and drier conditions are
expected Thursday but another system will approach the CWA Friday.
This could result in some light precipitation across AR or
extreme northwest MS Friday, but a reinforcing cold front will
shunt this moisture south by Friday night. Dry conditions are
expected area wide this weekend into early next week as
precipitable water drops below 1.0" across the Mid-South. This dry
air will promote below normal minimum temperatures, with some
areas dipping into the 50s during the early morning hours late
this week and into the weekend. The deterministic NBM may need to
be adjusted downward in areas like Jackson, TN, to account for
this.

We'll see a split flow pattern early next week. A strong trough
will move into the Great Lakes with southern branch shortwave
trough rotating through the Southern Plains by late Monday. These
waves will phase over the eastern CONUS, enhancing rain chances
during the midweek period. It doesn't appear to be a significant
weather system at this time.

MJ

&&

.AVIATION...
(18Z TAFS)
Issued at 1215 PM CDT Wed Sep 6 2023

Shower and storm coverage will likely increase this afternoon as
a cold front approaches the Mid-South. Inside of storms, brief
MVFR CIGs and IFR VSBY are possible, but overall conditions will
be VFR. Overnight, expect light northerly winds to persist. This,
combined with recent rainfall, will likely contribute to fog
formation at MKL by 6Z. By midmorning Thursday, expect winds to
increase to 6-8 kts.

ANS

&&

.MEG WATCHES/WARNINGS/ADVISORIES...
AR...Heat Advisory until 7 PM CDT this evening for ARZ035-036-048-049-
     058.

MO...None.
MS...Heat Advisory until 7 PM CDT this evening for MSZ001-007-008-
     010>012-020.

TN...Heat Advisory until 7 PM CDT this evening for TNZ088.

&&

PUBLIC FORECAST...MJ
AVIATION...ANS

In the hours before

Special weather statement, Sep 6, 2:29 PM CDT, 2 hours 15 minutes before

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Special weather statement, Sep 6, 2:54 PM CDT, 1 hour 50 minutes before

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Special weather statement, Sep 6, 3:44 PM CDT, 1 hour before

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Special weather statement, Sep 6, 4:25 PM CDT, 19 minutes before

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Special weather statement, Sep 6, 4:33 PM CDT, 11 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
Sep 6, 2:50 AM CDT	Heat Advisory	MEG	Coahoma, DeSoto, Panola, Quitman, Tallahatchie, Tate and 1 more	16 hr
Sep 6, 2:29 PM CDT	Special Weather Statement	MEG	DeSoto	31 min
Sep 6, 2:54 PM CDT	Special Weather Statement	MEG	DeSoto, Marshall	36 min
Sep 6, 3:44 PM CDT	Special Weather Statement	MEG	Benton	31 min
Sep 6, 4:02 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Lee, Marshall, Prentiss, Tippah, Union	43 min
Sep 6, 4:25 PM CDT	Special Weather Statement	MEG	DeSoto	35 min
Sep 6, 4:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	MEG	Itawamba, Lee, Union	46 min
Sep 6, 4:33 PM CDT	Special Weather Statement	MEG	Tippah	27 min
Sep 6, 4:55 PM CDT	Areal Flood Advisory	MEG	DeSoto	2 hr
Sep 6, 5:06 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Itawamba, Prentiss, Tishomingo	39 min
Sep 6, 5:07 PM CDT	Severe Thunderstorm Warning	MEG	Itawamba, Lee, Monroe	43 min
Sep 6, 5:12 PM CDT	Severe Thunderstorm Warning	MEG	Coahoma	48 min
Sep 6, 5:15 PM CDT	Severe Thunderstorm Warning	MEG	DeSoto, Panola, Tate	45 min
Sep 6, 5:26 PM CDT	Severe Thunderstorm Warning	MEG	Pontotoc, Union	49 min
Sep 6, 5:41 PM CDT	Special Weather Statement	MEG	Tishomingo	34 min
Sep 6, 5:47 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Prentiss, Tishomingo	32 min
Sep 6, 5:49 PM CDT	Special Weather Statement	MEG	Quitman	26 min
Sep 6, 5:59 PM CDT	Severe Thunderstorm Warning	MEG	DeSoto, Panola, Tate, Tunica	46 min
Sep 6, 6:02 PM CDT	Severe Thunderstorm Warning	MEG	Panola, Quitman, Tallahatchie	43 min
Sep 6, 6:10 PM CDT	Severe Thunderstorm Warning	MEG	Lee, Pontotoc	22 min
Sep 6, 6:41 PM CDT	Severe Thunderstorm Warning	MEG	Lafayette, Panola, Quitman, Tate, Tunica, Yalobusha	49 min
Sep 6, 6:42 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Calhoun, Chickasaw, Itawamba, Lafayette, Lee and 6 more	48 min
Sep 6, 5:17 PM CDT	Special Weather Statement	MEG	McNairy	28 min
Sep 6, 6:10 PM CDT	Special Weather Statement	MEG	Hardin	50 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2023 Severe Thunderstorm Warnings in Tennessee, 2023 Every severe thunderstorm warning in 2023

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.