Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 35, NWS Nashville, TN

February 12, 2020Coffee County, Grundy County, Warren County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Feb 12, 2020, 6:53 PM CST for Coffee County, Grundy County, Warren County, Tennessee. It was in force for 37 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Feb 12, 2020, 6:53 PM CST (00:53 UTC)
Expired: Feb 12, 2020, 7:30 PM CST
In force: 37 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Coffee County, TN, Grundy County, TN, Warren County, TN

The radar

The Northeast Alabama radar (KHTX), 75 km from the middle of the area, began a volume at 00:57 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.

What was reported inside it

Time	Report	Where	Remark
Feb 12, 6:57 PM CST	TSTM WND DMG	7 S Viola, TN	TREES DOWN REPORTED NEAR THE SKYMONT SCOUT RESERVATION. ALSO SEVERAL REPORTS OF POWER OUTAGES IN THE COUNTY.
Feb 12, 6:57 PM CST	TSTM WND DMG	7 S Viola, TN	TREES DOWN REPORTED NERA HTE SKYMONT SCOUT RESERVATION. ALSO SEVERAL REPORTS OF POWER OUTAGES IN THE COUNTY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 4 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 0.9 hours before the alert went out and 104 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 548 m above ground
0-6 km bulk shear: 99 kt
0-1 km storm-relative helicity: 775 m²/s²
0-3 km storm-relative helicity: 947 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

971 
WUUS54 KOHX 130053
SVROHX
TNC031-061-177-130130-
/O.NEW.KOHX.SV.W.0035.200213T0053Z-200213T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Nashville TN
653 PM CST Wed Feb 12 2020

The National Weather Service in Nashville has issued a

* Severe Thunderstorm Warning for...
  Southern Warren County in Middle Tennessee...
  Southeastern Coffee County in Middle Tennessee...
  Northern Grundy County in Middle Tennessee...

* Until 730 PM CST.

* At 653 PM CST, a severe thunderstorm was located 8 miles east of
  Manchester, moving east at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Altamont, Beersheba Springs, Viola and Hillsboro. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3554 8603 3570 8560 3561 8559 3553 8556
      3553 8561 3549 8554 3547 8554 3537 8596
TIME...MOT...LOC 0053Z 252DEG 43KT 3548 8594 

HAIL...<.75IN
WIND...60MPH
 
$$

10

2 follow-up statements

191 
WWUS54 KOHX 130106
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
706 PM CST Wed Feb 12 2020

TNC031-130116-
/O.CAN.KOHX.SV.W.0035.000000T0000Z-200213T0130Z/
Coffee TN-
706 PM CST Wed Feb 12 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN COFFEE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3570 8560 3561 8559 3553 8556 3553 8561
      3549 8554 3547 8554 3540 8584 3561 8585
TIME...MOT...LOC 0106Z 252DEG 43KT 3553 8576 

$$

TNC061-177-130130-
/O.CON.KOHX.SV.W.0035.000000T0000Z-200213T0130Z/
Warren TN-Grundy TN-
706 PM CST Wed Feb 12 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CST
FOR SOUTHEASTERN WARREN AND NORTHERN GRUNDY COUNTIES...

At 706 PM CST, a severe thunderstorm was located 11 miles south of
McMinnville, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Altamont and Beersheba Springs. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3570 8560 3561 8559 3553 8556 3553 8561
      3549 8554 3547 8554 3540 8584 3561 8585
TIME...MOT...LOC 0106Z 252DEG 43KT 3553 8576 

HAIL...<.75IN
WIND...60MPH
 
$$

10

413 
WWUS54 KOHX 130126
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
726 PM CST Wed Feb 12 2020

TNC061-177-130135-
/O.EXP.KOHX.SV.W.0035.000000T0000Z-200213T0130Z/
Warren TN-Grundy TN-
726 PM CST Wed Feb 12 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WARREN AND
NORTHERN GRUNDY COUNTIES WILL EXPIRE AT 730 PM CST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

Remember, a Severe Thunderstorm Warning still remains in effect for
southern Grundy County.

LAT...LON 3570 8560 3561 8559 3553 8556 3553 8561
      3549 8554 3547 8554 3540 8584 3561 8585
TIME...MOT...LOC 0125Z 252DEG 43KT 3560 8549 

$$

10

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 Feb 12, 5:27 PM CST, 1 hour 26 minutes earlier.

Area forecast discussion, Feb 12, 5:27 PM CST, 1 hour 26 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
527 PM CST Wed Feb 12 2020

.UPDATE...
FOR 00Z AVIATION DISCUSSION.

&&

.DISCUSSION...

The severe weather threat for this afternoon and evening still
exists, but with surface temperatures still in the 40s for most
areas low level instability is lacking which is a big hurdle to
overcome. The southern portions of the mid-state still have the
best chance as the slightly warmer air across northern Alabama
where mid-upper 50s temperatures with low-mid 50s dewpoints are
noted might creep in through the evening hours. VIS satellite
imagery indicates cloud cover is thinner from central Mississippi
through central Alabama, so mixing there has been better. NAM/GFS
forecast soundings for today depicted a strong inversion that only
gives way when the line of storms moves through this evening, so
a lack of building low level instability and marginal shear will
not be enough for a significant severe weather event. The concern
for flash flooding this evening still exists as rainfall rates of
2 inches per hour will be likely, and with saturated grounds
runoff will be significant so smaller creeks and streams will rise
quickly. Current radar trends over western Tennessee show mostly
40-50dBZ, but the precipitation band is narrow and progressive so
rainfall amounts around an inch to possibly 2 inches can be
expected, with amounts in excess of 2 inches less likely.

After the front pushes through tonight some lingering light rain
shower activity, mostly cloudy skies, and stiff northwest winds
ushering in cold air will make for an unpleasant winter day on
Thursday. The cold air advection continues into Friday, where
highs will struggle to break 40 degrees, and lows Friday morning
and Saturday morning could bottom out in the upper teens. A return
flow gradually develops and light rainfall could return as early
as Sunday, but more likely on Monday and Tuesday as isentropic
ascent and moisture increase. Next week does have some uncertainty
with just how much rain is possible, but the trend with both the
ECMWF and GFS has been for lesser amounts of rainfall which will
help our overall flood risk to continue to decrease through the
week. Both models show a front pushing through at some point, and
the other trend to watch is how soon the cold air advection
arrives and when the moisture leaves. It is possible some of the
precipitation may be in a non-liquid form, so for those wishing
for more winter be sure to watch this trend.

&&

.AVIATION...
00Z TAF DISCUSSION.

IFR to MVFR conditions across Middle TN terminals as we deal with
the latest system to move through the region. Some LIFR cigs are
likely before sunrise Thursday, but should improve back to MVFR by
late morning.

Winds will be gusty (30-35 kts) on this line of showers moving
through at issuance, but should back down to gusts of 20-25
overnight.

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch through late tonight for Cumberland-Fentress-
Grundy-Overton-Pickett-Putnam-Van Buren-Warren-White.

Flash Flood Watch through late tonight for Bedford-Cannon-
Cheatham-Clay-Coffee-Davidson-De Kalb-Dickson-Giles-Hickman-
Houston-Humphreys-Jackson-Lawrence-Lewis-Macon-Marshall-Maury-
Montgomery-Perry-Robertson-Rutherford-Smith-Stewart-Sumner-
Trousdale-Wayne-Williamson-Wilson.

&&

DISCUSSION......05
AVIATION........Unger

Hazardous weather outlook, Feb 12, 5:16 AM CST, 13 hours 37 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
516 AM CST Wed Feb 12 2020

TNZ005>011-023>034-056>066-075-077>080-093>095-131245-
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-
516 AM CST Wed Feb 12 2020

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight

Showers and thunderstorms will be on the increase today. By late
this afternoon and evening, strong to severe thunderstorms will be
possible, mainly across southern middle Tennessee and the Plateau.
Damaging winds and an isolated tornado or two will be possible.
Additionally, given the already wet conditions, flash flooding
and the flooding of rivers and streams will be an ongoing
possibility as well. Keep in mind, A Flash Flood Watch has been
issued for the mid state during this time period.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed on Wednesday afternoon
and into Thursday morning for potential flooding and
for strong to severe thunderstorms Wednesday afternoon
and evening.

21

In the hours before

Local storm report, Feb 12, 5:43 PM CST, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
543 PM CST WED FEB 12 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0524 PM     TSTM WND DMG     7 W MINOR HILL          35.04N  87.30W
02/12/2020                   LAWRENCE           TN   EMERGENCY MNGR

            REPORT OF A POWERLINE BLOWN ONTO A HOUSE NEAR FIVE
            POINTS. DAMAGE REPORTED TO THE HOUSE.

&&

EVENT NUMBER OHX2000124

FBORDEN

Local storm report, Feb 12, 5:47 PM CST, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
547 PM CST WED FEB 12 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0522 PM     TSTM WND DMG     7 ESE LORETTO           35.03N  87.34W
02/12/2020                   LAWRENCE           TN   EMERGENCY MNGR

            REPORT OF A ROOF OFF OF A BARN NEAR SECOND CREEK ROAD
            AND JOE WILLIAMS ROAD. ALSO LAWRENCEBURG UTILITES
            REPORTING 103 CUSTOMERS WITHOUT POWER.

&&

EVENT NUMBER OHX2000125

FBORDEN

Local storm report, Feb 12, 6:16 PM CST, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
616 PM CST WED FEB 12 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0548 PM     TSTM WND DMG     4 ESE PULASKI           35.17N  86.97W
02/12/2020                   GILES              TN   EMERGENCY MNGR

            TREES DOWN REPORTED ON STOVAL ROAD.

&&

EVENT NUMBER OHX2000126

FBORDEN

Special weather statement, Feb 12, 6:16 PM CST, 37 minutes before

Special Weather Statement
National Weather Service Nashville TN
616 PM CST Wed Feb 12 2020

TNZ028-030-032-062>065-075-077-078-130100-
Putnam TN-Cannon TN-Rutherford TN-Wilson TN-Bedford TN-Coffee TN-
De Kalb TN-Warren TN-Smith TN-White TN-
616 PM CST Wed Feb 12 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SMITH...DE KALB...
SOUTHEASTERN RUTHERFORD...WARREN...NORTHERN COFFEE...SOUTHEASTERN
WILSON...NORTHEASTERN BEDFORD...WESTERN WHITE...PUTNAM AND CANNON
COUNTIES UNTIL 700 PM CST...

At 615 PM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Gordonsville to 6 miles northeast of
Shelbyville. Movement was east at 60 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Cookeville, McMinnville, Sparta, Smithville, Woodbury, Algood,
Baxter, Gordonsville, Hickman, Alexandria, Morrison, Doyle, Bell
Buckle, Dowelltown, Liberty, Auburntown, Centertown, Hamptons
Crossroads, Rock Island State Park and Beechgrove.

This includes the following highways...
 Interstate 40 between mile markers 255 and 296.
 Interstate 24 between mile markers 87 and 101.

LAT...LON 3622 8533 3620 8533 3620 8531 3580 8556
      3580 8560 3578 8561 3577 8560 3576 8561
      3575 8559 3560 8569 3555 8649 3622 8598
      3622 8564 3621 8563 3623 8560 3623 8538
TIME...MOT...LOC 0015Z 259DEG 51KT 3622 8594 3558 8640

Schaper

Local storm report, Feb 12, 6:29 PM CST, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
629 PM CST WED FEB 12 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0606 PM     TSTM WND DMG     2 NW MURFREESBORO       35.88N  86.43W
02/12/2020                   RUTHERFORD         TN   LAW ENFORCEMENT

            POLICE REPORTED TREES DOWN,SOME BLOCKING THE BARFIELD
            ROAD.

&&

EVENT NUMBER OHX2000127

FBORDEN

Local storm report, Feb 12, 6:39 PM CST, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
639 PM CST WED FEB 12 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 PM     TSTM WND DMG     6 WSW CHAPEL HILL       35.59N  86.79W
02/12/2020                   MARSHALL           TN   EMERGENCY MNGR

            REPORTS OF A FEW TREES DOWN ACROSS MARSHALL COUNTY.

&&

EVENT NUMBER OHX2000128

FBORDEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 12, 6:16 PM CST	Special Weather Statement	OHX	Cannon, DeKalb, Putnam, Warren	44 min
Feb 12, 6:25 PM CST	Severe Thunderstorm Warning	OHX	Bedford, Coffee	35 min
Feb 12, 6:57 PM CST	Special Weather Statement	OHX	Van Buren, Warren, White	48 min
Feb 12, 7:03 PM CST	Special Weather Statement	OHX	Fentress, Pickett	42 min
Feb 12, 7:11 PM CST	Areal Flood Advisory	OHX	Hickman, Lewis, Perry, Wayne	3 hr
Feb 12, 7:15 PM CST	Severe Thunderstorm Warning	OHX	Grundy, Van Buren, Warren	23 min
Feb 12, 7:23 PM CST	Severe Thunderstorm Warning	OHX	Cumberland, Fentress, Overton, Putnam, Van Buren, White	37 min
Feb 12, 7:30 PM CST	Areal Flood Advisory	OHX	Putnam	3 hr
Feb 12, 9:52 PM CST	Areal Flood Advisory	OHX	Cumberland	3 hr
Feb 12, 11:22 PM CST	River Flood Advisory	OHX	Maury	12 hr
Feb 12, 11:46 PM CST	Areal Flood Advisory	OHX	Giles, Lawrence, Lewis, Marshall, Maury, Wayne	3 hr
Feb 13, 2:01 AM CST	River Flood Advisory	OHX	Davidson	3 hr
Feb 13, 2:04 AM CST	River Flood Advisory	OHX	Lawrence	12 hr
Feb 13, 2:06 AM CST	River Flood Advisory	OHX	Hickman	7 hr
Feb 13, 3:58 AM CST	River Flood Advisory	OHX	Davidson, Williamson	29 hr
Feb 13, 8:15 AM CST	River Flood Warning	OHX	Maury	27 hr
Feb 13, 8:15 AM CST	River Flood Warning	OHX	Humphreys	3 days
Feb 13, 10:59 AM CST	River Flood Advisory	OHX	Perry, Wayne	15 hr
Feb 13, 3:28 PM CST	River Flood Advisory	OHX	Williamson	36 hr
Feb 13, 3:28 PM CST	River Flood Advisory	OHX	Williamson	36 hr
Feb 13, 5:18 PM CST	River Flood Advisory	OHX	Lawrence	5 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.