Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Memphis, TN

August 18, 2021McNairy County, Tennessee

NWS Memphis, TN issued this special weather statement at Aug 18, 2021, 3:41 PM CDT for McNairy County, Tennessee. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 18, 2021, 3:41 PM CDT (20:41 UTC)
Expired: Aug 18, 2021, 4:15 PM CDT
In force: 34 min
Issued by: NWS Memphis, TN
Hail: 0.00 in
Wind: 30

County McNairy County, TN

The radar

The Memphis radar (KNQA), 118 km from the middle of the area, began a volume at 20:40 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, 8.7 hours before the alert went out and 131 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: 1042 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 701 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 18, 3:02 PM CDT, 39 minutes earlier.

Area forecast discussion, Aug 18, 3:02 PM CDT, 39 minutes before

Area Forecast Discussion
National Weather Service Memphis TN
302 PM CDT Wed Aug 18 2021

.DISCUSSION...
Weak trough across the region coupled with a southwest flow of
moisture will continue into Thursday.  This will result in periodic
showers and thunderstorms.  With fairly stout precipitable water
values heavy rainfall may result in localized ponding or flash
flooding.

The upper flow becomes a bit more northwest on Friday as an upper
low closes off over the Northeast US. Rainfall will finally
become more scattered Saturday into Sunday as an upper high builds
into the South Central US.

The upper high will dominate our weather from Sunday into the middle
of next week. This will result in sultry conditions, with heat
headlines an increasing possibility. The risk for diurnal
convection remains.

 Belles

&&

.AVIATION...
18Z TAF cycle

Showers and thunderstorms will continue to move across the Mid-
South this afternoon from southwest to northeast. VFR conditions
will be found most of the time but there will be periods of lower
ceilings and visibilities. Most of this activity will end early
this evening with another round of showers and thunderstorms
starting Thursday morning. Winds will be mainly from the south at
around 5 knots for much of the forecast period.

ARS

&&

.MEG WATCHES/WARNINGS/ADVISORIES...
AR...None.
MO...None.
MS...None.
TN...None.
&&

Hazardous weather outlook, Aug 18, 4:35 AM CDT, 11 hours 6 minutes before

Hazardous Weather Outlook
National Weather Service Memphis TN
435 AM CDT Wed Aug 18 2021

ARZ009-018-026>028-035-036-048-049-058-MOZ113-115-MSZ001>017-
020>024-TNZ001>004-019>022-048>055-088>092-191100-
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-
435 AM CDT Wed Aug 18 2021

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

.DAY ONE...Today and Tonight

A few strong to severe storms are possible across the Mid-South
this afternoon. The strongest storms may be capable of producing
damaging winds. Locally heavy rainfall may lead to flash flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Numerous showers and thunderstorms will continue to pose a threat
for locally heavy rainfall Thursday and Friday.

Hot and humid conditions will return this weekend into early next
week with heat indices approaching 105 degrees.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

MJ

In the hours before

Special weather statement, Aug 18, 1:35 PM CDT, 2 hours 6 minutes before

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Special weather statement, Aug 18, 2:02 PM CDT, 1 hour 39 minutes before

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Special weather statement, Aug 18, 2:43 PM CDT, 58 minutes before

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Special weather statement, Aug 18, 2:48 PM CDT, 53 minutes before

Special Weather Statement
National Weather Service Memphis TN
248 PM CDT Wed Aug 18 2021

MSZ015-022-023-182015-
Pontotoc MS-Calhoun MS-Chickasaw MS-
248 PM CDT Wed Aug 18 2021

...A strong thunderstorm will impact portions of northwestern
Chickasaw, southeastern Calhoun and southwestern Pontotoc Counties
through 315 PM CDT...

At 248 PM CDT, Doppler radar was tracking a strong thunderstorm over
Calhoun City, or 17 miles west of Houston, moving northeast at 25
mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Houston, Bruce, Calhoun City, Vardaman, Derma, Pittsboro, Pyland,
Houlka, New Houlka, Robbs, Thorn, Parkersburg, Reid, Loyd, Pannell,
Thelma and Matthews.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3378 8933 3390 8945 3420 8914 3394 8886
TIME...MOT...LOC 1948Z 235DEG 22KT 3389 8932

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

SWB

Special weather statement, Aug 18, 3:19 PM CDT, 22 minutes before

Special Weather Statement
National Weather Service Memphis TN
319 PM CDT Wed Aug 18 2021

MSZ015-022-023-182045-
Pontotoc MS-Calhoun MS-Chickasaw MS-
319 PM CDT Wed Aug 18 2021

...A strong thunderstorm will impact portions of northwestern
Chickasaw, northeastern Calhoun and southern Pontotoc Counties
through 345 PM CDT...

At 319 PM CDT, Doppler radar was tracking a strong thunderstorm near
Vardaman, or 12 miles northwest of Houston, moving northeast at 30
mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Pontotoc, Vardaman, Houlka, New Houlka, Algoma, Robbs, Thorn, Reid,
Loyd, Pannell, Thelma, Matthews, Wallfield and George P Cossar State
Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3385 8919 3399 8933 3427 8903 3407 8882
TIME...MOT...LOC 2019Z 228DEG 24KT 3397 8920

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

SWB

Special weather statement, Aug 18, 3:41 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Memphis TN
341 PM CDT Wed Aug 18 2021

TNZ053-091-092-182115-
Chester TN-McNairy TN-Hardin TN-
341 PM CDT Wed Aug 18 2021

...A strong thunderstorm will impact portions of central McNairy,
west central Hardin and southeastern Chester Counties through 415 PM
CDT...

At 341 PM CDT, Doppler radar was tracking a strong thunderstorm near
Selmer, moving east at 20 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Selmer, Adamsville, Robertson, McNairy, Bethel Springs, Eastview,
Stantonville, Enville, Forty Forks, Hickory Flats, Mount Vinson, New
Lawton, Martin Camp, Rose Creek, Good Hope, Woodville, Old Lawton,
Gilchrist, West Shihloh and Purdy.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3510 8871 3527 8878 3541 8841 3515 8831
TIME...MOT...LOC 2041Z 252DEG 19KT 3521 8867

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

SWB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 3:22 AM CDT	Areal Flood Advisory	MEG	Panola	113 min
Aug 18, 8:24 AM CDT	Areal Flood Advisory	MEG	Marshall	2 hr
Aug 18, 10:44 AM CDT	Special Weather Statement	MEG	Lafayette	31 min
Aug 18, 12:07 PM CDT	Special Weather Statement	MEG	Tunica	38 min
Aug 18, 12:46 PM CDT	Special Weather Statement	MEG	Quitman	29 min
Aug 18, 1:28 PM CDT	Special Weather Statement	MEG	Panola	32 min
Aug 18, 1:35 PM CDT	Special Weather Statement	MEG	Tate	25 min
Aug 18, 1:49 PM CDT	Areal Flood Advisory	MEG	Panola, Tate	2 hr
Aug 18, 2:02 PM CDT	Special Weather Statement	MEG	Lafayette	28 min
Aug 18, 2:48 PM CDT	Special Weather Statement	MEG	Calhoun, Chickasaw	27 min
Aug 18, 3:19 PM CDT	Special Weather Statement	MEG	Pontotoc	26 min
Aug 18, 3:52 PM CDT	Special Weather Statement	MEG	Prentiss	38 min
Aug 18, 4:18 PM CDT	Flash Flood Warning	MEG	Alcorn, Prentiss, Tippah	3 hr
Aug 18, 4:23 PM CDT	Flash Flood Warning	MEG	Tishomingo	3 hr
Aug 18, 6:20 PM CDT	Special Weather Statement	MEG	Chickasaw	25 min
Aug 18, 2:43 PM CDT	Special Weather Statement	MEG	Hardeman	32 min
Aug 18, 4:32 PM CDT	Areal Flood Advisory	MEG	Carroll, Gibson	3 hr
Aug 18, 4:45 PM CDT	Special Weather Statement	MEG	Phillips	30 min
Aug 18, 5:25 PM CDT	Special Weather Statement	MEG	Lee	35 min

Nearby

Special Weather Statements in Tennessee, 2021 Every special weather statement 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.