Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 321, NWS Memphis, TN

July 18, 2012Henry County, Tennessee

NWS Memphis, TN issued this severe thunderstorm warning at Jul 18, 2012, 6:51 PM CDT for Henry County, Tennessee. It was in force for 22 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: Jul 18, 2012, 6:51 PM CDT (23:51 UTC)
Expired: Jul 18, 2012, 7:13 PM CDT
In force: 22 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon

County Henry County, TN

The radar

The Paducah radar (KPAH), 75 km from the middle of the area, began a volume at 23:53 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, 11.9 hours before the alert went out and 162 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: 2917 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 858 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

721 
WUUS54 KMEG 182351
SVRMEG
TNC079-190030-
/O.NEW.KMEG.SV.W.0321.120718T2351Z-120719T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
651 PM CDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL HENRY COUNTY IN NORTHWEST TENNESSEE...

* UNTIL 730 PM CDT

* AT 651 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
  THUNDERSTORM PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR MILL CREEK...OR 8
  MILES SOUTH OF MURRAY...AND MOVING SOUTHWEST AT 10 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MILL CREEK
  AND JONES MILL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

.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 3649 8826 3640 8847 3650 8849 3651 8837
      3651 8827
TIME...MOT...LOC 2351Z 057DEG 7KT 3649 8835

$$

1 follow-up statement

786 
WWUS54 KMEG 190013
SVSMEG

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
713 PM CDT WED JUL 18 2012

TNC079-190023-
/O.CAN.KMEG.SV.W.0321.000000T0000Z-120719T0030Z/
HENRY TN-
713 PM CDT WED JUL 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL HENRY COUNTY IS
CANCELLED...

AT 713 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE 
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE WEAKENED...AND NO 
LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY. THEREFORE...THE 
SEVERE THUNDERSTORM WARNING IS CANCELLED.

LAT...LON 3649 8826 3640 8847 3650 8849 3651 8837
      3651 8827
TIME...MOT...LOC 0013Z 057DEG 7KT 3647 8839

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 3:27 AM CDT	Heat Advisory	MEG	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	3 days
Jul 18, 4:37 PM CDT	Special Weather Statement	MEG	Hardin	23 min
Jul 18, 4:43 PM CDT	Severe Thunderstorm Warning	MEG	Hardin	29 min
Jul 18, 5:03 PM CDT	Flash Flood Warning	MEG	Hardin	3 hr
Jul 18, 6:02 PM CDT	Flash Flood Warning	MEG	Decatur, Hardin, Henderson	3 hr
Jul 18, 6:09 PM CDT	Flash Flood Warning	MEG	Henry	3 hr
Jul 18, 6:48 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Decatur, Henderson	42 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2012 Every severe thunderstorm warning in 2012

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.