Alert archive / Tennessee / Flash Flood Warnings in 2023

Flash Flood Warning 54, NWS Memphis, TN

August 12, 2023Henry County, Tennessee

NWS Memphis, TN issued this flash flood warning at Aug 12, 2023, 10:50 AM CDT for Henry County, Tennessee. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 12, 2023, 10:50 AM CDT (15:50 UTC)
Expired: Aug 12, 2023, 2:00 PM CDT
In force: 3 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

County Henry County, TN

The radar

The Paducah radar (KPAH), 92 km from the middle of the area, began a volume at 15:49 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

Nashville Metro, TN (KBNA), launched 12:00Z, 3.8 hours before the alert went out and 154 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: 2540 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 811 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Aug 12, 6:12 AM CDT, 4 hours 38 minutes earlier.

Area forecast discussion, Aug 12, 6:12 AM CDT, 4 hours 38 minutes before

Area Forecast Discussion
National Weather Service Memphis TN
612 AM CDT Sat Aug 12 2023

...New AVIATION...

.SYNOPSIS...
Issued at 236 AM CDT Sat Aug 12 2023

Hot temperatures remain the biggest weather headline across the
Midsouth. An Excessive Heat Warning and a Heat Advisory have been
issued for much of the area including southern portions of west
Tennessee, east central Arkansas and all of north Mississippi.
Heat indices are expected to reach 105 to 115 in those areas.
Additional heat products will likely be needed Sunday and possibly
Monday. A strong August cold front will bring us much cooler
conditions Tuesday and Wednesday with gradual warming after
midweek. Much of the upcoming work week looks dry.

&&

.DISCUSSION...
(Today through Friday)
Issued at 236 AM CDT Sat Aug 12 2023

A strengthening ridge over east Texas and Louisiana will keep
conditions hot and mostly dry across the Midsouth over the weekend
and into early next week. This feature will also keep most
thunderstorm activity to our north along the northern periphery of
the ridge although there is a small chance of an MCS clipping
northeast Arkansas, the Missouri Bootheel and northern portions of
west Tennessee tonight and Sunday. As a result the Storm
Prediction Center has included a small portion of far northern
portions of the Midsouth in a Slight to Marginal risk for severe
storms during that timeframe. The main threat will be damaging
wind and hail.

Late Sunday into Monday a deep, highly amplified midlevel trough
will shift out of the northern Plains into the Midwest. At the
surface, an attendant cold front will move quickly across the
Midsouth on Monday. We could still see heat advisory
conditions(105-109 heat index) in portions of north Mississippi
and east central Arkansas Monday afternoon ahead of the front, but
cooler conditions should arrive to all of the Midsouth by
Tuesday. Latest guidance has come in even cooler for Tuesday and
Wednesday featuring high temperatures in the middle 70s to middle
80s each day. Our coolest morning temperatures will likely occur
Wednesday when upper 50s are not out of the question in far
northern portions of the Midsouth. Most of the area will be in the
low to middle 60s Wednesday morning.

After Monday, the remainder of the upcoming work week looks
totally dry. A ridge over the Central and Southern Plains will
restrengthen quickly after midweek resulting in high temperatures
back in the middle 80s to middle 90s, warmest in east central
Arkansas and northwest Mississippi, but we should remain below
heat advisory criteria(105 or greater Heat Index). A Heat Advisory
may be needed again by Saturday.

30/Sirmon

&&

.AVIATION...
(12Z TAFS)
Issued at 612 AM CDT Sat Aug 12 2023

An MCS tracking SE will bring showers and thunderstorms across the
area today. Generally, VFR conditions are expected to prevail, but
periods of heavy rainfall may lower VSBYS to MVFR intermittently.
Models had a decent discrepancy overnight, but are starting to
come to a better agreement. Winds should generally stay sub 8kts,
but there may be occasional wind gusts associated with the MCS. NW
Flow will back southerly before veering to the NW once again with
a similar setup tomorrow for another MCS to track a similar
pattern and timing to today.

DNM

&&

.MEG WATCHES/WARNINGS/ADVISORIES...
AR...Heat Advisory from noon today to 8 PM CDT this evening for
     ARZ035-036-048.

     Excessive Heat Warning from noon today to 8 PM CDT this evening
     for ARZ049-058.

MO...None.
MS...Heat Advisory from noon today to 8 PM CDT this evening for
     MSZ001>006-008-009-014.

     Excessive Heat Warning from noon today to 8 PM CDT this evening
     for MSZ007-010>013-015>017-020>024.

TN...Heat Advisory from noon today to 8 PM CDT this evening for
     TNZ053-088>092.

&&

PUBLIC FORECAST...JDS
AVIATION...DNM

In the hours before

Special weather statement, Aug 12, 9:56 AM CDT, 54 minutes before

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Local storm report, Aug 12, 10:06 AM CDT, 44 minutes before

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Special weather statement, Aug 12, 10:07 AM CDT, 43 minutes before

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Special weather statement, Aug 12, 10:16 AM CDT, 34 minutes before

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Special weather statement, Aug 12, 10:19 AM CDT, 31 minutes before

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Special weather statement, Aug 12, 10:32 AM CDT, 18 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
Aug 12, 2:16 PM CDT	Excessive Heat Warning	MEG	Calhoun, Chickasaw, Coahoma, Itawamba, Lafayette, Lee and 8 more	30 hr
Aug 12, 2:16 PM CDT	Heat Advisory	MEG	Alcorn, Benton, DeSoto, Itawamba, Lafayette, Lee and 8 more	30 hr
Aug 12, 3:15 PM CDT	Special Weather Statement	MEG	Monroe	30 min
Aug 12, 7:56 AM CDT	Special Weather Statement	MEG	Hardeman	34 min
Aug 12, 8:25 AM CDT	Special Weather Statement	MEG	Obion	35 min
Aug 12, 8:55 AM CDT	Severe Thunderstorm Warning	MEG	Gibson, Henry, Obion, Weakley	50 min
Aug 12, 9:25 AM CDT	Special Weather Statement	MEG	Hardeman	35 min
Aug 12, 9:34 AM CDT	Special Weather Statement	MEG	Crockett, Dyer, Gibson	26 min
Aug 12, 9:43 AM CDT	Special Weather Statement	MEG	Henry, Weakley	32 min
Aug 12, 9:47 AM CDT	Areal Flood Advisory	MEG	Henry, Obion, Weakley	3 hr
Aug 12, 9:56 AM CDT	Special Weather Statement	MEG	Carroll	34 min
Aug 12, 10:07 AM CDT	Special Weather Statement	MEG	Chester, Decatur, Henderson	23 min
Aug 12, 10:16 AM CDT	Special Weather Statement	MEG	Benton	29 min
Aug 12, 10:19 AM CDT	Special Weather Statement	MEG	Hardin, McNairy	26 min
Aug 12, 10:32 AM CDT	Special Weather Statement	MEG	Decatur, Henderson	28 min
Aug 12, 11:57 AM CDT	Areal Flood Advisory	MEG	Decatur, Henderson	2 hr

Nearby

Flash Flood Warnings in Tennessee, 2023 Every flash flood 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.