Alert archive / Mississippi / Tornado Warnings in 2012

Tornado Warning 41, NWS Jackson, MS

May 12, 2012Simpson County, Mississippi

NWS Jackson, MS issued this tornado warning at May 12, 2012, 3:56 PM CDT for Simpson County, Mississippi. It was in force for 51 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
May 12, 2012, 3:56 PM CDT (20:56 UTC)
Expired
May 12, 2012, 4:47 PM CDT
In force
51 min
Issued by
NWS Jackson, MS
Area
Storm-based polygon

County Simpson County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 39 km from the middle of the area, began a volume at 20:57 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

Jackson, MS (KJAN), launched 12:00Z, 8.9 hours before the alert went out and 45 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-pSkew-T log-p diagram, Jackson, MS at 12:00Z on 2012-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 834 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 12:00Z on 2012-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 128 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
834 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
533 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
128 m²/s²
0-3 km storm-relative helicity
176 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

017 
WFUS54 KJAN 122056
TORJAN
MSC127-122200-
/O.NEW.KJAN.TO.W.0041.120512T2056Z-120512T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON MS
356 PM CDT SAT MAY 12 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN SIMPSON COUNTY IN CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITY OF MENDENHALL...

* UNTIL 500 PM CDT

* AT 356 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR UNION
  MOVING EAST AT 15 MPH.

* THE TORNADO WILL BE NEAR...
  MENDENHALL BY 440 PM CDT...
  SANATORIUM BY 455 PM CDT...
  MARTINVILLE BY 500 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT A TORNADO IS OCCURRING OR IMMINENT. YOU
SHOULD ACTIVATE YOUR TORNADO ACTION PLAN AND TAKE PROTECTIVE ACTION
NOW.

&&

LAT...LON 3189 9014 3191 9017 3204 8970 3204 8966
      3190 8966 3186 9013
TIME...MOT...LOC 2056Z 255DEG 15KT 3190 9007

$$

19
5 follow-up statements
705 
WWUS54 KJAN 122106
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
406 PM CDT SAT MAY 12 2012

MSC127-122200-
/O.CON.KJAN.TO.W.0041.000000T0000Z-120512T2200Z/
SIMPSON MS-
406 PM CDT SAT MAY 12 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR NORTHERN
SIMPSON COUNTY...

AT 406 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUE TO
TRACK A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
TORNADO WAS LOCATED NEAR PINOLA MOVING EAST AT 20 MPH.

THE TORNADO WILL BE NEAR...
  PINOLA BY 415 PM CDT...
  MENDENHALL BY 435 PM CDT...
  SANATORIUM BY 450 PM CDT...
  MARTINVILLE BY 455 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT A TORNADO IS OCCURRING OR IMMINENT. YOU
SHOULD ACTIVATE YOUR TORNADO ACTION PLAN AND TAKE PROTECTIVE ACTION
NOW.

&&

LAT...LON 3189 9008 3193 9009 3204 8970 3204 8966
      3190 8966 3186 9006
TIME...MOT...LOC 2106Z 256DEG 16KT 3191 9002

$$

19
208 
WWUS54 KJAN 122115
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
415 PM CDT SAT MAY 12 2012

MSC127-122200-
/O.CON.KJAN.TO.W.0041.000000T0000Z-120512T2200Z/
SIMPSON MS-
415 PM CDT SAT MAY 12 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR
NORTHEASTERN SIMPSON COUNTY...

AT 415 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUE TO
TRACK A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
TORNADO WAS LOCATED 8 MILES SOUTHWEST OF MENDENHALL MOVING EAST AT 20
MPH.

THE TORNADO WILL BE NEAR...
  MENDENHALL BY 435 PM CDT...
  MARTINVILLE BY 500 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT A TORNADO IS OCCURRING OR IMMINENT. YOU
SHOULD ACTIVATE YOUR TORNADO ACTION PLAN AND TAKE PROTECTIVE ACTION
NOW.

&&

LAT...LON 3189 9000 3191 9003 3194 9003 3204 8970
      3204 8966 3191 8966
TIME...MOT...LOC 2115Z 256DEG 16KT 3192 8997

$$

19
360 
WWUS54 KJAN 122124
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
424 PM CDT SAT MAY 12 2012

MSC127-122200-
/O.CON.KJAN.TO.W.0041.000000T0000Z-120512T2200Z/
SIMPSON MS-
424 PM CDT SAT MAY 12 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR
NORTHEASTERN SIMPSON COUNTY...

AT 424 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUE TO
TRACK A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
TORNADO WAS LOCATED NEAR MENDENHALL MOVING EAST AT 20 MPH.

THE TORNADO WILL BE NEAR...
  MENDENHALL BY 435 PM CDT...
  MARTINVILLE BY 455 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT A TORNADO IS OCCURRING OR IMMINENT. YOU
SHOULD ACTIVATE YOUR TORNADO ACTION PLAN AND TAKE PROTECTIVE ACTION
NOW.

&&

LAT...LON 3191 8996 3192 8998 3195 9000 3204 8970
      3204 8966 3193 8966
TIME...MOT...LOC 2124Z 250DEG 18KT 3194 8992

$$

19
213 
WWUS54 KJAN 122140
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
440 PM CDT SAT MAY 12 2012

MSC127-122200-
/O.CON.KJAN.TO.W.0041.000000T0000Z-120512T2200Z/
SIMPSON MS-
440 PM CDT SAT MAY 12 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR
NORTHEASTERN SIMPSON COUNTY...

AT 440 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUE TO
TRACK A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
TORNADO WAS LOCATED NEAR MENDENHALL MOVING EAST AT 20 MPH.

THE TORNADO WILL BE NEAR...
  MARTINVILLE BY 500 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT A TORNADO IS OCCURRING OR IMMINENT. YOU
SHOULD ACTIVATE YOUR TORNADO ACTION PLAN AND TAKE PROTECTIVE ACTION
NOW.

&&

LAT...LON 3194 8966 3193 8988 3195 8989 3198 8989
      3204 8970 3204 8966
TIME...MOT...LOC 2140Z 257DEG 14KT 3196 8986

$$

19
609 
WWUS54 KJAN 122147
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
447 PM CDT SAT MAY 12 2012

MSC127-122157-
/O.CAN.KJAN.TO.W.0041.000000T0000Z-120512T2200Z/
SIMPSON MS-
447 PM CDT SAT MAY 12 2012

...THE TORNADO WARNING FOR NORTHEASTERN SIMPSON COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE TORNADO WARNING HAS WEAKENED.

LAT...LON 3194 8966 3193 8988 3195 8989 3198 8989
      3204 8970 3204 8966
TIME...MOT...LOC 2147Z 260DEG 11KT 3196 8984

$$

19

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 12, 8:35 AM CDTSpecial Weather StatementJANClaiborne, Copiah, Franklin, Hinds, Lawrence, Lincoln and 1 more25 min
May 12, 10:01 AM CDTSpecial Weather StatementJANAttala, Copiah, Hinds, Holmes, Leake, Madison and 2 more54 min
May 12, 10:29 AM CDTSpecial Weather StatementJANHinds, Madison56 min
May 12, 10:41 AM CDTFlash Flood WarningJANMadison2 hr
May 12, 11:09 AM CDTSpecial Weather StatementJANAttala, Carroll, Choctaw, Grenada, Leake, Montgomery56 min
May 12, 11:25 AM CDTSevere Thunderstorm WarningJANForrest50 min
May 12, 12:10 PM CDTSpecial Weather StatementJANJones30 min
May 12, 1:06 PM CDTSpecial Weather StatementJANLowndes, Neshoba, Newton, Noxubee, Oktibbeha, Scott and 1 more84 min
May 12, 1:32 PM CDTSpecial Weather StatementJANJefferson Davis28 min
May 12, 1:44 PM CDTSpecial Weather StatementJANJasper56 min
May 12, 1:49 PM CDTSpecial Weather StatementJANLamar61 min
May 12, 1:56 PM CDTSevere Thunderstorm WarningJANSimpson, Smith49 min
May 12, 2:10 PM CDTTornado WarningJANSimpson, Smith30 min
May 12, 2:18 PM CDTSevere Thunderstorm WarningJANKemper, Neshoba37 min
May 12, 2:43 PM CDTSpecial Weather StatementJANNewton47 min
May 12, 3:15 PM CDTSpecial Weather StatementJANSimpson60 min
May 12, 3:20 PM CDTSpecial Weather StatementJANNewton60 min
May 12, 3:29 PM CDTSevere Thunderstorm WarningJANCopiah, Simpson61 min
May 12, 3:51 PM CDTSpecial Weather StatementJANCopiah, Simpson59 min
May 12, 4:11 PM CDTSpecial Weather StatementJANLauderdale59 min
May 12, 4:39 PM CDTFlash Flood WarningJANJasper, Newton, Scott, Smith3 hr
May 12, 4:49 PM CDTSpecial Weather StatementJANSimpson61 min
May 12, 5:15 PM CDTSpecial Weather StatementJANKemper60 min

Nearby

Tornado Warnings in Mississippi, 2012Every tornado warning in 2012Tornadoes 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.