Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 168, NWS Nashville, TN

September 22, 2018Lawrence County, Lewis County, Wayne County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Sep 22, 2018, 6:10 PM CDT for Lawrence County, Lewis County, Wayne County, Tennessee. It was in force for 35 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 22, 2018, 6:10 PM CDT (23:10 UTC)
Expired: Sep 22, 2018, 6:45 PM CDT
In force: 35 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Lawrence County, TN, Lewis County, TN, Wayne County, TN

The radar

The Nashville radar (KOHX), 136 km from the middle of the area, began a volume at 23:09 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, 11.2 hours before the alert went out and 124 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: 197 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 794 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Nashville, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 22, 3:36 PM CDT, 2 hours 34 minutes earlier.

Area forecast discussion, Sep 22, 3:36 PM CDT, 2 hours 34 minutes before

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Hazardous weather outlook, Sep 22, 6:41 AM CDT, 11 hours 29 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
641 AM CDT Sat Sep 22 2018

TNZ005>011-023>034-056>066-075-077>080-093>095-231145-
Stewart-Montgomery-Robertson-Sumner-Macon-Clay-Pickett-Houston-
Humphreys-Dickson-Cheatham-Davidson-Wilson-Trousdale-Smith-
Jackson-Putnam-Overton-Fentress-Perry-Hickman-Lewis-Williamson-
Maury-Marshall-Rutherford-Cannon-De Kalb-White-Cumberland-Bedford-
Coffee-Warren-Grundy-Van Buren-Wayne-Lawrence-Giles-
641 AM CDT Sat Sep 22 2018

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight.

Flash flooding may become an issue as several areas have already
received 2 to 4 inches of rain. An additional 1 to 3 inches is
possible today and tonight, and while there is low confidence on
the exact location of the new rain, training storms throughout the
day will increase the flooding risk generally for those west of
the Cumberland Plateau.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Excessive rainfall in possible Sunday and Monday, generally west
of the Cumberland Plateau. This extra rain could exacerbate
flooding concerns both days. Rises on area rivers might also
become a problem by the start of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may become necessary for rainfall measurements
and flooding reports today and tomorrow.

27

In the hours before

Special weather statement, Sep 22, 1:33 PM CDT, 4 hours 37 minutes before

Special Weather Statement
National Weather Service Nashville TN
133 PM CDT SAT SEP 22 2018

TNZ031>033-221900-
Putnam TN-Overton TN-Jackson TN-
133 PM CDT SAT SEP 22 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL OVERTON...JACKSON
AND NORTHWESTERN PUTNAM COUNTIES UNTIL 200 PM CDT...

At 133 PM CDT, Doppler radar was tracking a strong thunderstorm near
Baxter, or 10 miles south of Gainesboro, moving northeast at 25 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Gainesboro, Baxter, Granville, Whitleyville and Cummins Falls State
Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3635 8536 3609 8566 3617 8581 3618 8579
      3619 8580 3621 8581 3621 8579 3622 8578
      3624 8578 3625 8580 3625 8581 3648 8568
TIME...MOT...LOC 1833Z 212DEG 21KT 3621 8571

13

Special weather statement, Sep 22, 2:28 PM CDT, 3 hours 42 minutes before

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Special weather statement, Sep 22, 2:44 PM CDT, 3 hours 26 minutes before

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Special weather statement, Sep 22, 5:15 PM CDT, 55 minutes before

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Special weather statement, Sep 22, 5:47 PM CDT, 23 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 21, 8:02 PM CDT	Areal Flood Advisory	OHX	Lawrence, Wayne	118 min
Sep 21, 8:48 PM CDT	Areal Flood Advisory	OHX	Maury	117 min
Sep 21, 10:03 PM CDT	Areal Flood Advisory	OHX	Lawrence	117 min
Sep 21, 10:20 PM CDT	Flash Flood Warning	OHX	Lawrence	115 min
Sep 21, 10:41 PM CDT	Areal Flood Advisory	OHX	Giles, Marshall, Maury	2 hr
Sep 21, 11:26 PM CDT	Areal Flood Advisory	OHX	Wayne	3 hr
Sep 22, 12:03 AM CDT	Flash Flood Warning	OHX	Lawrence	3 hr
Sep 22, 1:33 PM CDT	Special Weather Statement	OHX	Jackson	27 min
Sep 22, 1:46 PM CDT	Severe Thunderstorm Warning	OHX	Jackson	11 min
Sep 22, 2:28 PM CDT	Special Weather Statement	OHX	Smith	32 min
Sep 22, 2:44 PM CDT	Special Weather Statement	OHX	Giles, Marshall	46 min
Sep 22, 5:15 PM CDT	Special Weather Statement	OHX	Lawrence, Wayne	30 min
Sep 22, 5:20 PM CDT	Areal Flood Advisory	OHX	Wayne	115 min
Sep 22, 5:47 PM CDT	Special Weather Statement	OHX	Lawrence	28 min
Sep 22, 5:50 PM CDT	Areal Flood Advisory	OHX	Lawrence	61 min
Sep 22, 6:50 PM CDT	Areal Flood Advisory	OHX	Lawrence	115 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2018 Every severe thunderstorm warning in 2018

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.