Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 85, NWS Nashville, TN

May 9, 2021Rutherford County, Williamson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at May 9, 2021, 7:30 PM CDT for Rutherford County, Williamson County, Tennessee. It was in force for 11 min. 1 report 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 9, 2021, 7:30 PM CDT (00:30 UTC)
Expired: May 9, 2021, 7:41 PM CDT
In force: 11 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Rutherford County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 50 km from the middle of the area, began a volume at 00:32 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 9, 7:38 PM CDT	TORNADO	3 Sw Arrington, TN	A SMALL, BRIEF AND WEAK EF-0 TORNADO TOUCHED DOWN ALONG MEEKS ROAD SOUTHWEST OF PAGE HIGH SCHOOL AND MOVED NORTHEAST, PASSING JUST SOUTH OF THE STAGS LEAP SUBDIVISION, BEFORE LIFTING NEAR ARNO ROAD. A FEW TREES AND LARGE BRANCHES WERE BLOWN DOWN ALONG THE PATH

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

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.5 hours before the alert went out and 293 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: 436 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1408 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

As transmitted.

066 
WUUS54 KOHX 100030
SVROHX
TNC149-187-100115-
/O.NEW.KOHX.SV.W.0085.210510T0030Z-210510T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Nashville TN
730 PM CDT Sun May 9 2021

The National Weather Service in Nashville has issued a

* Severe Thunderstorm Warning for...
  Southwestern Rutherford County in Middle Tennessee...
  Southeastern Williamson County in Middle Tennessee...

* Until 815 PM CDT.

* At 730 PM CDT, a severe thunderstorm was located 7 miles southeast
  of Franklin, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Eagleville and Triune. 

This includes Interstate 840 between mile markers 31 and 50.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3579 8684 3589 8682 3587 8650 3571 8657
TIME...MOT...LOC 0030Z 283DEG 24KT 3584 8676 

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

Schaper

1 follow-up statement

549 
WWUS54 KOHX 100041
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
741 PM CDT Sun May 9 2021

TNC149-187-100051-
/O.CAN.KOHX.SV.W.0085.000000T0000Z-210510T0115Z/
Rutherford TN-Williamson TN-
741 PM CDT Sun May 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN RUTHERFORD AND
SOUTHEASTERN WILLIAMSON COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds are 
still possible with this thunderstorm.

LAT...LON 3579 8684 3589 8682 3587 8650 3571 8657
TIME...MOT...LOC 0040Z 283DEG 24KT 3582 8667 

$$

Schaper

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 7:05 PM CDT	Special Weather Statement	OHX	Rutherford, Williamson	40 min
May 9, 7:07 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Giles, Lawrence, Marshall, Maury	18 min
May 9, 8:02 PM CDT	Special Weather Statement	OHX	Cumberland, White	43 min
May 9, 8:06 PM CDT	Special Weather Statement	OHX	Warren	39 min
May 9, 8:43 PM CDT	Special Weather Statement	OHX	Grundy	32 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.