Alert archive / Tennessee / Tornado Warnings in 2018

Tornado Warning 39, NWS Memphis, TN

October 31, 2018Madison County, Tennessee

NWS Memphis, TN issued this tornado warning at Oct 31, 2018, 6:32 PM CDT for Madison County, Tennessee. It was in force for 28 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: Oct 31, 2018, 6:32 PM CDT (23:32 UTC)
Expired: Oct 31, 2018, 7:00 PM CDT
In force: 28 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Madison County, TN

The radar

The Memphis radar (KNQA), 89 km from the middle of the area, began a volume at 23:32 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.

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 11.5 hours before the alert went out and 124 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: 361 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 534 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

756 
WFUS54 KMEG 312332
TORMEG
TNC113-010000-
/O.NEW.KMEG.TO.W.0039.181031T2332Z-181101T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Memphis TN
632 PM CDT WED OCT 31 2018

The National Weather Service in Memphis has issued a

* Tornado Warning for...
  Central Madison County in western Tennessee...

* Until 700 PM CDT.
    
* At 632 PM CDT, doppler radar indicated a severe thunderstorm
  producing a tornado was located near Mercer, or 10 miles southwest
  of Jackson, moving northeast at 25 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Jackson, Bemis, Denmark, Neely, Westover and East Union. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a storm shelter or an interior room on the
lowest floor of a sturdy building. Avoid windows. If you are
outdoors, in a mobile home, or in a vehicle, move to the closest
substantial shelter and protect yourself from flying debris.

&&

LAT...LON 3549 8901 3556 8904 3571 8886 3558 8873
TIME...MOT...LOC 2332Z 235DEG 21KT 3554 8899 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

JOHNSON

2 follow-up statements

188 
WWUS54 KMEG 312342
SVSMEG

Severe Weather Statement
National Weather Service Memphis TN
642 PM CDT WED OCT 31 2018

TNC113-010000-
/O.CON.KMEG.TO.W.0039.000000T0000Z-181101T0000Z/
Madison TN-
642 PM CDT WED OCT 31 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR CENTRAL
MADISON COUNTY...
    
At 640 PM CDT, doppler radar indicated a severe thunderstorm 
producing a tornado located 6 miles southwest of Jackson, moving 
northeast at 30 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Jackson, Bemis, Neely, Westover and East Union. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a storm shelter or an interior room on the
lowest floor of a sturdy building. Avoid windows. If you are
outdoors, in a mobile home, or in a vehicle, move to the closest
substantial shelter and protect yourself from flying debris.

&&

LAT...LON 3553 8896 3557 8899 3571 8886 3558 8873
TIME...MOT...LOC 2340Z 233DEG 26KT 3559 8893 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

JOHNSON

308 
WWUS54 KMEG 312356
SVSMEG

Severe Weather Statement
National Weather Service Memphis TN
656 PM CDT WED OCT 31 2018

TNC113-010006-
/O.EXP.KMEG.TO.W.0039.000000T0000Z-181101T0000Z/
Madison TN-
656 PM CDT WED OCT 31 2018

...THE TORNADO WARNING FOR CENTRAL MADISON COUNTY WILL EXPIRE AT 700
PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

LAT...LON 3553 8896 3557 8899 3571 8886 3558 8873
TIME...MOT...LOC 2356Z 235DEG 21KT 3564 8884 

$$

JOHNSON

Nearby

Tornado Warnings in Tennessee, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.