Alert archive / Tennessee / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 160, NWS Nashville, TN

May 27, 20178 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at May 27, 2017, 7:47 PM CDT for 8 counties in Tennessee. It was in force for 28 min. 6 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: May 27, 2017, 7:47 PM CDT (00:47 UTC)
Expired: May 27, 2017, 8:15 PM CDT
In force: 28 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Cannon County, TN, Davidson County, TN, DeKalb County, TN, Putnam County, TN, Rutherford County, TN, Smith County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 44 km from the middle of the area, began a volume at 00:46 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
May 27, 7:50 PM CDT	TSTM WND DMG	Alexandria, TN	SEVERAL TREES AND POWERLINES DOWN.
May 27, 7:59 PM CDT	TSTM WND DMG	5 Nne Dowelltown, TN	MULTIPLE TREES DOWN ALONG HIGHWAY 264 BETWEEN TEMPERANCE HALL AND SMITHVILLE.
May 27, 8:09 PM CDT	TSTM WND DMG	4 Nw Cookeville, TN	TREE ON A VEHICLE WITH OCCUPANT TRAPPED INSIDE AT COUNTY FARM ROAD AND GAINESBORO GRADE.
May 27, 8:10 PM CDT	TSTM WND DMG	4 Wnw Cookeville, TN	A TREE FELL AND BLOCKED PEACH ORCHARD ROAD AT FLATT ROAD
May 27, 8:10 PM CDT	TSTM WND DMG	6 Nw Cookeville, TN	NUMEROUS TREES AND POWERLINES DOWN ACROSS THE WESTERN PART OF THE COUNTY.
May 27, 8:10 PM CDT	TSTM WND DMG	Smithville, TN	PHOTOS SHOWED NUMEROUS TREES WERE BLOWN DOWN IN AND AROUND SMITHVILLE

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 7 storm reports to this severe thunderstorm warning; the first came 3 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 27, 1:36 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 27, 5:13 PM CDT	Severe Thunderstorm Watch PDS	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 0.8 hours before the alert went out and 43 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: 2109 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 841 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 12.3

Open this sounding in Storm Lab

The text

As transmitted.

115 
WUUS54 KOHX 280047
SVROHX
TNC015-037-041-141-149-159-187-189-280115-
/O.NEW.KOHX.SV.W.0160.170528T0047Z-170528T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Nashville TN
747 PM CDT SAT MAY 27 2017

The National Weather Service in Nashville has issued a

* Severe Thunderstorm Warning for...
  Southern Smith County in Middle Tennessee...
  Southeastern Davidson County in Middle Tennessee...
  Central De Kalb County in Middle Tennessee...
  Rutherford County in Middle Tennessee...
  Eastern Williamson County in Middle Tennessee...
  Wilson County in Middle Tennessee...
  West central Putnam County in Middle Tennessee...
  Northern Cannon County in Middle Tennessee...

* Until 815 PM CDT

* At 746 PM CDT, a severe thunderstorm was located near Watertown, or
  10 miles southeast of Lebanon, moving east at 70 mph.

  HAZARD...70 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings. 

* Locations impacted include...
  Murfreesboro, Franklin, Cookeville, Lebanon, Smithville, Woodbury,
  Carthage, Smyrna, Brentwood, La Vergne, Mount Juliet, Nolensville,
  Forest Hills, Oak Hill, Algood, Watertown, Baxter, Gordonsville,
  Walterhill and Rural Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3625 8580 3622 8566 3623 8559 3621 8545
      3586 8596 3569 8665 3571 8668 3571 8673
      3608 8683 3632 8632
TIME...MOT...LOC 0046Z 273DEG 59KT 3614 8616 

HAIL...1.00IN
WIND...70MPH
 
$$
31

1 follow-up statement

263 
WWUS54 KOHX 280052
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
752 PM CDT SAT MAY 27 2017

TNC015-037-041-141-149-159-187-189-280115-
/O.CON.KOHX.SV.W.0160.000000T0000Z-170528T0115Z/
Smith TN-Davidson TN-De Kalb TN-Rutherford TN-Williamson TN-
Wilson TN-Putnam TN-Cannon TN-
752 PM CDT SAT MAY 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHERN SMITH...SOUTHEASTERN DAVIDSON...CENTRAL DE KALB...
RUTHERFORD...EASTERN WILLIAMSON...SOUTHERN WILSON...WEST CENTRAL
PUTNAM AND NORTHERN CANNON COUNTIES...

At 752 PM CDT, a severe thunderstorm was located near Gordonsville,
or 9 miles southwest of Carthage, moving east at 70 mph.

HAZARD...70 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings. 

Locations impacted include...
Murfreesboro, Franklin, Cookeville, Smithville, Woodbury, Carthage,
Smyrna, Brentwood, La Vergne, Nolensville, Oak Hill, Algood,
Watertown, Baxter, Gordonsville, Walterhill, Antioch, Rural Hill,
Hickman and South Carthage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3625 8580 3622 8566 3623 8559 3621 8545
      3586 8596 3569 8665 3571 8668 3571 8673
      3606 8680 3612 8633 3625 8618
TIME...MOT...LOC 0052Z 273DEG 59KT 3613 8603 

HAIL...1.00IN
WIND...70MPH
 
$$
31

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 May 27, 6:47 PM CDT, 1 hour earlier.

Area forecast discussion, May 27, 6:47 PM CDT, 1 hour before

Area Forecast Discussion
National Weather Service Nashville TN
647 PM CDT Sat May 27 2017

.UPDATE...
FOR 00Z AVIATION DISCUSSION.

&&

.DISCUSSION...

Surface high is centered just off the Florida Gulf Coast this hour
as a warm front becomes established along the Ohio Valley. This
leaves Middle Tennessee in a warm, moist & unstable environment
that is primed for thunderstorms today & tomorrow. Earlier
activity has completely dissipated, but a second round of storms
is now developing north of the TN/KY line, with weaker cells
popping up across Middle Tennessee. Skies have partially cleared
after the earlier storms, so this is allowing temperatures to warm
considerably and should help destabilization.

The morning sounding from OHX shows a strong capping inversion
situated around 750 mb, with steep mid-level lapse rates and
surface-based lifted index of -3. MUCAPE was just shy of 2,000
J/kg. GFS forecast soundings do show some erosion of the cap by
18Z tomorrow with the mid-level lapse rates contributing to higher
CAPE's and impressive LI values. Forecast SRH's indicate very
weak shear, so straight-line winds and large hail appear to be the
primary threats with the anticipated severe weather tonight and
tomorrow.

It appears as though isolated/scattered storms will persist
throughout the day and early evening until more organized
convection enters the mid state maybe 02Z or later. There is some
discrepancy between the NAM and GFS regarding timing of later
(tomorrow) storms, so on Sunday we'll just stick with likely
POP's most areas to go along with SPC's slight risk for day 2.

We likely won't see fropa here in Middle Tennessee until after
12Z Monday, so we won't see POP's drop off until then. Look for
slightly cooler temperatures (near normal or slightly above) to
start off next week and lasting at least until next weekend. A wet
pattern will slip back in rather quickly, with isolated or
scattered POP's most areas from Tuesday through the end of the
forecast period.

&&

.AVIATION...
00Z TAF DISCUSSION.

Lots of action at TAF sites this evening. Small TSRA cluster hit
CSV earlier but is moving east/away. Meanwhile, larger and
stronger cluster hit CKV within past hour (23Z) and is moving
quickly southeast toward BNA with arrival there around 0030Z.
Otherwise, expect scattered to numerous TSRA across the region
this evening with occasional low vsbys/cigs and wind gusts to
40kts or more. Very low confidence in forecast timing of
additional rounds of TSRA after 05Z but still expect some showers
and storms off and on very late tonight into Sunday morning.
Redevelopment of storms possible again Sunday afternoon.

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

DISCUSSION......08
AVIATION........49

Hazardous weather outlook, May 27, 3:54 PM CDT, 3 hours 53 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
354 PM CDT Sat May 27 2017

TNZ005>011-023>034-056>066-075-077>080-093>095-281015-
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-
354 PM CDT Sat May 27 2017

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Tonight

There is a slight to moderate risk of severe storms across Middle
Tennessee tonight. Damaging winds, large hail, and localized
flooding are the main threats, but a couple of tornadoes are also
possible.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

There is a slight risk of severe storms across Middle Tennessee
again Sunday and Sunday night. Damaging winds, large hail, and
localized flooding will be possible once again.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed tonight and again on Sunday.

Spotter Thunderstorm Reporting Criteria
Tornado
Funnel Cloud
Flooding
Hail >= 1/2 inch
Winds > 50 MPH (Measured)
Structural Damage
Trees or Power Lines Down

Rose

In the hours before

Local storm report, May 27, 6:56 PM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE NASHVILLE TN
656 PM CDT SAT MAY 27 2017

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

0619 PM     TSTM WND DMG     CLARKSVILLE             36.56N  87.35W
05/27/2017                   MONTGOMERY         TN   LAW ENFORCEMENT

            SEVERAL REPORTS OF TREES DOWN THROUGHOUT THE COUNTY.

&&

CORRECTED EVENT TIME...COUNTY/STATE...LOCATION

EVENT NUMBER OHX1700595

JACKSON

Local storm report, May 27, 6:58 PM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
658 PM CDT SAT MAY 27 2017

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

0644 PM     TSTM WND DMG     SPRINGFIELD             36.50N  86.88W
05/27/2017                   ROBERTSON          TN   LAW ENFORCEMENT

            NUMEROUS REPORTS OF TREES DOWN THROUGHOUT THE COUNTY.

&&

EVENT NUMBER OHX1700596

JACKSON

Local storm report, May 27, 7:22 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
722 PM CDT SAT MAY 27 2017

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

0638 PM     TSTM WND DMG     TENNESSEE RIDGE         36.32N  87.76W
05/27/2017                   HOUSTON            TN   LAW ENFORCEMENT

            SEVERAL REPORTS OF TREES DOWN COUNTYWIDE.

&&

EVENT NUMBER OHX1700597

JACKSON

Local storm report, May 27, 7:33 PM CDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
733 PM CDT SAT MAY 27 2017

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

0726 PM     HAIL             4 S COOKEVILLE          36.10N  85.51W
05/27/2017  E1.75 INCH       PUTNAM             TN   BROADCAST MEDIA

&&

EVENT NUMBER OHX1700598

JACKSON

Local storm report, May 27, 7:37 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
737 PM CDT SAT MAY 27 2017

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

0719 PM     TSTM WND DMG     2 SE FRANKLIN           35.91N  86.82W
05/27/2017                   WILLIAMSON         TN   LAW ENFORCEMENT

            TREE DOWN AT CAROTHERS PARKWAY AND MURFREESBORO ROAD

&&

EVENT NUMBER OHX1700599

JACKSON

Local storm report, May 27, 7:46 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
746 PM CDT SAT MAY 27 2017

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

0627 PM     TSTM WND DMG     11 WSW CLARKSVILLE      36.51N  87.53W
05/27/2017                   MONTGOMERY         TN   AMATEUR RADIO

            18-INCH DIAMETER TREE ON A HOUSE ON BACKRIDGE ROAD.

&&

EVENT NUMBER OHX1700600

JACKSON

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 7:15 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Macon, Robertson, Smith, Sumner, Trousdale and 1 more	30 min
May 27, 7:18 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Rutherford, Smith, Sumner and 2 more	27 min
May 27, 7:19 PM CDT	Severe Thunderstorm Warning	OHX	Fentress, Overton, Pickett	26 min
May 27, 7:20 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Hickman, Houston, Humphreys and 2 more	25 min
May 27, 7:22 PM CDT	Severe Thunderstorm Warning	OHX	Houston, Montgomery, Stewart	23 min
May 27, 7:24 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Overton, Putnam, White	36 min
May 27, 7:41 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Houston, Humphreys, Montgomery, Robertson and 1 more	34 min
May 27, 7:43 PM CDT	Severe Thunderstorm Warning	OHX	Clay, DeKalb, Jackson, Macon, Putnam, Smith and 2 more	32 min
May 27, 7:49 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Hickman, Humphreys, Williamson	26 min
May 27, 7:54 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland	36 min
May 27, 8:06 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Cumberland, Fentress, Jackson, Overton, Pickett and 1 more	54 min
May 27, 8:09 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Cumberland, DeKalb, Putnam, Van Buren, Warren and 1 more	66 min
May 27, 8:16 PM CDT	Special Weather Statement	OHX	Hickman, Lewis, Maury, Perry, Williamson	44 min
May 27, 8:21 PM CDT	Tornado Warning	OHX	Cumberland	13 min
May 27, 8:25 PM CDT	Tornado Warning	OHX	Cumberland, Putnam	35 min
May 27, 8:26 PM CDT	Severe Thunderstorm Warning	OHX	Hickman	19 min
May 27, 8:27 PM CDT	Tornado Warning	OHX	Van Buren, White	21 min
May 27, 8:43 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Hickman, Lewis, Marshall, Maury	32 min
May 27, 8:45 PM CDT	Tornado Warning	OHX	Cumberland	30 min
May 27, 8:56 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	34 min
May 27, 8:57 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Van Buren, Warren, White	18 min
May 27, 9:01 PM CDT	Special Weather Statement	OHX	Lewis, Wayne	29 min
May 27, 9:11 PM CDT	Special Weather Statement	OHX	Grundy	64 min
May 27, 9:14 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Giles, Marshall	31 min
May 27, 9:17 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Marshall, Rutherford	17 min
May 27, 9:22 PM CDT	Special Weather Statement	OHX	Giles, Lawrence, Wayne	53 min
May 27, 10:36 PM CDT	Special Weather Statement	OHX	Wayne	39 min
May 27, 11:59 PM CDT	Special Weather Statement	OHX	Wayne	46 min
May 28, 12:36 AM CDT	Special Weather Statement	OHX	Lawrence	39 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2017 Every severe thunderstorm warning in 2017

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.