Alert archive / Tennessee / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 13, NWS Memphis, TN

February 20, 2014Benton County, Tennessee

NWS Memphis, TN issued this severe thunderstorm warning at Feb 20, 2014, 4:40 PM CST for Benton County, Tennessee. It was in force for 20 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: Feb 20, 2014, 4:40 PM CST (22:40 UTC)
Expired: Feb 20, 2014, 5:00 PM CST
In force: 20 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon

County Benton County, TN

The radar

The Ft Campbell radar (KHPX), 89 km from the middle of the area, began a volume at 22:44 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 watch it was issued in

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

Issued	Product	Office	Lasted
Feb 20, 2:23 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.7 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: 130 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 638 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

456 
WUUS54 KMEG 202240
SVRMEG
TNC005-202300-
/O.NEW.KMEG.SV.W.0013.140220T2240Z-140220T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
440 PM CST THU FEB 20 2014

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BENTON COUNTY IN TENNESSEE...

* UNTIL 500 PM CST

* AT 440 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM PRODUCING QUARTER SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR BIG
  SANDY...OR 9 MILES NORTH OF CAMDEN...AND MOVING NORTHEAST AT 55
  MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BIG SANDY
  AND FAXON.

 THIS WARNING ALSO INCLUDES AREAS NEAR KENTUCKY LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

.A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A STORM SHELTER OR SMALL INTERIOR ROOM.

.STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT SEVERE WEATHER ONLY...CALL 1 800 4 3 2 0 8 7 5.

&&

LAT...LON 3606 8811 3614 8819 3622 8814 3623 8810
      3625 8811 3626 8808 3631 8810 3636 8802
      3636 8798 3631 8794 3622 8795 3617 8792
TIME...MOT...LOC 2240Z 232DEG 49KT 3620 8808

$$

1 follow-up statement

492 
WWUS54 KMEG 202254
SVSMEG

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
454 PM CST THU FEB 20 2014

TNC005-202304-
/O.EXP.KMEG.SV.W.0013.000000T0000Z-140220T2300Z/
BENTON TN-
454 PM CST THU FEB 20 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BENTON COUNTY WILL
EXPIRE AT 500 PM CST...

AT 454 PM CST...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA.
THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO
EXPIRE.

LAT...LON 3606 8811 3614 8819 3622 8814 3623 8810
      3625 8811 3626 8808 3631 8810 3636 8802
      3636 8798 3631 8794 3622 8795 3617 8792
TIME...MOT...LOC 2254Z 232DEG 49KT 3631 8789

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 20, 4:06 PM CST	Severe Thunderstorm Warning	MEG	Fayette, Shelby	39 min
Feb 20, 4:08 PM CST	Tornado Warning	MEG	Shelby	37 min
Feb 20, 4:12 PM CST	Severe Thunderstorm Warning	MEG	Benton, Carroll, Henry	33 min
Feb 20, 4:19 PM CST	Severe Thunderstorm Warning	MEG	Shelby	41 min
Feb 20, 4:31 PM CST	Tornado Warning	MEG	Lake, Obion	44 min
Feb 20, 4:52 PM CST	Severe Thunderstorm Warning	MEG	Fayette, Hardeman	38 min
Feb 20, 5:01 PM CST	Tornado Warning	MEG	Lake, Obion	44 min
Feb 20, 5:01 PM CST	Tornado Warning	MEG	Fayette	29 min
Feb 20, 5:22 PM CST	Severe Thunderstorm Warning	MEG	Chester, Fayette, Hardeman, McNairy, Madison	38 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2014 Every severe thunderstorm warning in 2014

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.